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Cordova sqlite plugin with Android performance enhancements, GPL or commercial license options, with LEGACY SUPPORT for Windows 8.1 / Windows Phone 8.1 on VS 2015

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Cordova/PhoneGap sqlite storage - free enterprise version with performance improvements for Android (legacy common version with FUTURE TODO limited extra features)

Native interface to sqlite in a Cordova/PhoneGap plugin for Android, iOS, macOS, Windows 8.1, Windows Phone 8.1, and Windows 10 (UWP), with API similar to HTML5/Web SQL API.

This plugin version uses a special Android NDK sqlite database access library (C-language implementation) to provide significant performance and memory usage improvements on the Android platform.

This plugin version is available under GPL v3 (https://www.gnu.org/licenses/gpl-3.0.txt) or commercial license options and includes components available under the MIT and Apache 2.0 licenses listed in LICENSE.md. Contact for commercial license: sales@litehelpers.net

NOTE: Commercial licenses for litehelpers / Cordova-sqlite-enterprise-free are valid for this plugin version as well.

About this plugin version branch

Free enterprise version with performance improvements for Android - legacy common version branch (supports Windows 8.1/Windows Phone 8.1 along with Android/iOS/macOS/Windows 10 UWP) with FUTURE TODO limited extra features (FUTURE TODO pre-populated database support), using the before_plugin_install hook to fetch the sqlite3 component dependencies from npm.

WARNING: Multiple SQLite problem

This plugin uses non-standard litehelpers / Android-sqlite-evcore-native-driver-free sqlite database access implementation on Android. In case an application access the SAME database using multiple plugins there is a risk of data corruption (ref: litehelpers/Cordova-sqlite-storage#626) as described in http://ericsink.com/entries/multiple_sqlite_problem.html and https://www.sqlite.org/howtocorrupt.html.

The workaround is to use the androidDatabaseImplementation: 2 setting as described in the Android sqlite implementation section below:

var db = window.sqlitePlugin.openDatabase({name: 'my.db', location: 'default', androidDatabaseImplementation: 2});

This plugin version also uses a fixed version of sqlite3 on iOS/macOS/Windows. In case the application accesses the SAME database using multiple plugins there is a risk of data corruption as described in https://www.sqlite.org/howtocorrupt.html (similar to the multiple sqlite problem for Android as described in http://ericsink.com/entries/multiple_sqlite_problem.html).

Services available

The primary author and maintainer @brodybits (Christopher J. Brody aka Chris Brody) is available for part-time contract assignments. Services available for this project include:

  • Priority issue support
  • Help with application code such as debugging, optimization, etc.
  • Warranty and support retainers
  • Priority fixes and enhancements
  • Custom feature development

Other services available include:

  • Front-end/back-end development
  • Mentoring and training services

For more information:

A quick tour

To open a database:

var db = null;

document.addEventListener('deviceready', function() {
  db = window.sqlitePlugin.openDatabase({name: 'demo.db', location: 'default'});
});

IMPORTANT: Like with the other Cordova plugins your application must wait for the deviceready event. This is especially tricky in Angular/ngCordova/Ionic controller/factory/service callbacks which may be triggered before the deviceready event is fired.

To populate a database using the standard transaction API:

  db.transaction(function(tx) {
    tx.executeSql('CREATE TABLE IF NOT EXISTS DemoTable (name, score)');
    tx.executeSql('INSERT INTO DemoTable VALUES (?,?)', ['Alice', 101]);
    tx.executeSql('INSERT INTO DemoTable VALUES (?,?)', ['Betty', 202]);
  }, function(error) {
    console.log('Transaction ERROR: ' + error.message);
  }, function() {
    console.log('Populated database OK');
  });

To check the data using the standard transaction API:

  db.transaction(function(tx) {
    tx.executeSql('SELECT count(*) AS mycount FROM DemoTable', [], function(tx, rs) {
      console.log('Record count (expected to be 2): ' + rs.rows.item(0).mycount);
    }, function(tx, error) {
      console.log('SELECT error: ' + error.message);
    });
  });

To populate a database using the SQL batch API:

  db.sqlBatch([
    'CREATE TABLE IF NOT EXISTS DemoTable (name, score)',
    [ 'INSERT INTO DemoTable VALUES (?,?)', ['Alice', 101] ],
    [ 'INSERT INTO DemoTable VALUES (?,?)', ['Betty', 202] ],
  ], function() {
    console.log('Populated database OK');
  }, function(error) {
    console.log('SQL batch ERROR: ' + error.message);
  });

To check the data using the single SQL statement API:

  db.executeSql('SELECT count(*) AS mycount FROM DemoTable', [], function(rs) {
    console.log('Record count (expected to be 2): ' + rs.rows.item(0).mycount);
  }, function(error) {
    console.log('SELECT SQL statement ERROR: ' + error.message);
  });

See the Sample section for a sample with a more detailed explanation.

Status

  • Patches will NOT be accepted on this plugin version due to some possible licensing issues.
  • This plugin is NOT supported by PhoneGap Developer App or PhoneGap Desktop App.
  • This plugin version uses a before_plugin_install hook to fetch and install cordova-sqlite-evcore-free-dependencies (with sqlite3 and Android-evcore-native-driver dependencies) from npm.
  • A recent version of the Cordova CLI (such as 6.5.0 / 7.1.0 / 8.0.0) is recommended. Cordova versions older than 6.0.0 are missing the cordova-ios@4.0.0 security fixes. In addition it may be necessary to use cordova prepare in case of cordova-ios older than 4.3.0 (Cordova CLI 6.4.0).
  • Use of other systems such as Cordova Plugman, PhoneGap CLI, PhoneGap Build, and Intel XDK is no longer supported by this plugin version since they do not honor the before_plugin_install hook. The supported solution is to use litehelpers / Cordova-sqlite-evcore-extbuild-free (GPL or commercial license terms); alternative with permissive license terms is available at: brodybits / cordova-sqlite-legacy-build-support (limited testing, limited updates).
  • This plugin version includes the following extra features:
  • The iOS database location is now mandatory, as documented below.
  • SQLite version 3.22.0 included with the following compile-time options:
    • SQLITE_THREADSAFE=1
    • SQLITE_DEFAULT_SYNCHRONOUS=3 (EXTRA DURABLE build setting) ref: litehelpers/Cordova-sqlite-storage#736
    • SQLITE_LOCKING_STYLE=1 on iOS/macOS ONLY
    • HAVE_USLEEP=1 (iOS/macOS/Windows)
    • SQLITE_DEFAULT_MEMSTATUS=0
    • SQLITE_OMIT_DECLTYPE
    • SQLITE_OMIT_DEPRECATED
    • SQLITE_OMIT_PROGRESS_CALLBACK
    • SQLITE_OMIT_SHARED_CACHE
    • SQLITE_OMIT_LOAD_EXTENSION
    • SQLITE_TEMP_STORE=2
    • SQLITE_ENABLE_FTS3
    • SQLITE_ENABLE_FTS3_PARENTHESIS
    • SQLITE_ENABLE_FTS4
    • SQLITE_ENABLE_FTS5
    • SQLITE_ENABLE_RTREE
    • SQLITE_ENABLE_JSON1
    • SQLITE_DEFAULT_PAGE_SIZE=4096 and SQLITE_DEFAULT_CACHE_SIZE=-2000 - new stable page/cache sizes from 3.12.0 ref: http://sqlite.org/pgszchng2016.html; http://sqlite.org/releaselog/3_12_0.html
    • SQLITE_OS_WINRT (Windows only)
    • NDEBUG on Windows (Release build only)
  • This plugin version supports the use of two (2) possible Android sqlite database implementations:
  • The following feature is available in litehelpers / cordova-sqlite-ext (with permissive license terms, missing Android-sqlite-evcore-native-driver performance enhancements), XXX TODO MISSING in litehelpers / Cordova-sqlite-evcore-extbuild-free:
    • Pre-populated database (all platforms Android/iOS/macOS/Windows)
  • Windows platform version (using a customized version of the performant doo / SQLite3-WinRT C++ component) has the following known limitations:
  • The macOS platform version ("osx" platform) is not tested in a release build and should be considered pre-alpha.
  • Android versions supported: 2.3.3 - 7.1.1 (API level 10 - 25) on armeabi, armeabi-v7a, x86, x86_64, arm64-v8a, tested on Android 4.4 - 8.1 (API level 19 - 27) (cordova-android pre-7.0 needed to support Android pre-4.4 ref: https://cordova.apache.org/docs/en/latest/guide/platforms/android/)
  • iOS versions supported: 8.x / 9.x / 10.x / 11.x
  • FTS3, FTS4, FTS5, R-Tree, and JSON1 are fully tested and supported for all target platforms in this version branch.
  • Default PRAGMA journal_mode setting (tested):
    • Android with builtin android.database implementation (as selected using the androidDatabaseImplementation option in window.sqlitePlugin.openDatabase): persist (pre-8.x) / truncate (Android 8+) (NOT covered by automatic spec test suite in this plugin version branch)
    • otherwise: delete
  • AUTO-VACUUM is not enabled by default. If no form of VACUUM or PRAGMA auto_vacuum is used then sqlite will automatically reuse deleted data space for new data but the database file will never shrink. For reference: http://www.sqlite.org/pragma.html#pragma_auto_vacuum and litehelpers/Cordova-sqlite-storage#646

Announcements

Highlights

  • Drop-in replacement for HTML5/Web SQL API: the only change should be to replace the static window.openDatabase() factory call with window.sqlitePlugin.openDatabase(), with parameters as documented below. Known deviations are documented in the deviations section below.
  • Failure-safe nested transactions with batch processing optimizations (according to HTML5/Web SQL API)
  • Transaction API (based on HTML5/Web SQL API) is designed for maximum flexiblibility, does not allow any transactions to be left hanging open.
  • As described in this posting:
    • Keeps sqlite database in known, platform specific user data location on all supported platforms (Android/iOS/macOS/Windows), which can be reconfigured on iOS/macOS. Whether or not the database on the iOS platform is synchronized to iCloud depends on the selected database location.
    • No arbitrary size limit. SQLite limits described at: http://www.sqlite.org/limits.html
  • Also validated for multi-page applications by internal test selfTest function.
  • This project is self-contained though with sqlite3 dependencies auto-fetched by npm. There are no dependencies on other plugins such as cordova-plugin-file.
  • Windows platform version uses a customized version of the performant doo / SQLite3-WinRT C++ component.
  • SQLCipher support for Android/iOS/macOS/Windows is available in: litehelpers / Cordova-sqlcipher-adapter
  • Intellectual property:
    • All source code is tracked to the original author in git
    • Major authors are tracked in AUTHORS.md
    • License of each component is tracked in LICENSE.md
    • History of this project is also described in HISTORY.md

TIP: It is possible to migrate from Cordova to a pure native solution and continue using the data stored by this plugin.

Getting started

Recommended prerequisites

  • Install a recent version of Cordova CLI, create a simple app with no plugins, and run it on the desired target platforms.
  • Add a very simple plugin such as cordova-plugin-dialogs or an echo plugin and get it working. Ideally you should be able to handle a callback with some data coming from a prompt.

These prereqisites are very well documented in a number of excellent resources including:

More resources can be found by https://www.google.com/search?q=cordova+tutorial. There are even some tutorials available on YouTube as well.

In addition, this guide assumes a basic knowledge of some key JavaScript concepts such as variables, function calls, and callback functions. There is an excellent explanation of JavaScript callbacks at http://cwbuecheler.com/web/tutorials/2013/javascript-callbacks/.

MAJOR TIPS: As described in the Installing section:

  • It is recommended to use the --save flag when installing plugins to track them in config.xml in case of Cordova CLI pre-7.0 (automatic starting with Cordova CLI 7.0). If all plugins are tracked in config.xml then there is no need to commit the plugins subdirectory tree into the source repository.
  • In general it is not recommended to commit the platforms subdirectory tree into the source repository.

NOTICE: This plugin is only supported with the Cordova CLI. This plugin is not supported with other Cordova/PhoneGap systems such as PhoneGap CLI, PhoneGap Build, Plugman, Intel XDK, Webstorm, etc.

Windows platform notes

The Windows platform can present a number of challenges which increase when using this plugin. The following tips are recommended for getting started with Windows:

  • First start to build and run an app on another platform such as Android or iOS with this plugin.
  • Try working with a very simple app using simpler plugins such as cordova-plugin-dialogs and possibly cordova-plugin-file on the Windows platform.
  • Read through the Windows platform usage of the Installing section.
  • Then try adding this plugin to a very simple app such as brodybits / cordova-sqlite-test-app and running the Windows project in the Visual Studio GUI with a specific target CPU selected. WARNING: It is not possible to use this plugin with the "Any CPU" target.

Quick installation

Use the following command to install this plugin from the Cordova CLI:

cordova plugin add https://github.com/litehelpers/cordova-sqlite-evcore-legacy-ext-common-free # --save RECOMMENDED for Cordova CLI pre-7.0

Add any desired platform(s) if not already present, for example:

cordova platform add android

OPTIONAL: prepare before building (MANDATORY for cordova-ios older than 4.3.0 (Cordova CLI 6.4.0))

cordova prepare

or to prepare for a single platform, Android for example:

cordova prepare android

Please see the Installing section for more details.

NOTE: The new brodybits / cordova-sqlite-test-app project includes the echo test, self test, and string test described below along with some more sample functions.

Self test

Try the following programs to verify successful installation and operation:

Echo test - verify successful installation and build:

document.addEventListener('deviceready', function() {
  window.sqlitePlugin.echoTest(function() {
    console.log('ECHO test OK');
  });
});

Self test - automatically verify basic database access operations including opening a database; basic CRUD operations (create data in a table, read the data from the table, update the data, and delete the data); close and delete the database:

document.addEventListener('deviceready', function() {
  window.sqlitePlugin.selfTest(function() {
    console.log('SELF test OK');
  });
});

NOTE: It may be easier to use a JavaScript or native alert function call along with (or instead of) console.log to verify that the installation passes both tests. Same for the SQL string test variations below. (Note that the Windows platform does not support the standard alert function, please use cordova-plugin-dialogs instead.)

SQL string test

This test verifies that you can open a database, execute a basic SQL statement, and get the results (should be TEST STRING):

document.addEventListener('deviceready', function() {
  var db = window.sqlitePlugin.openDatabase({name: 'test.db', location: 'default'});
  db.transaction(function(tr) {
    tr.executeSql("SELECT upper('Test string') AS upperString", [], function(tr, rs) {
      console.log('Got upperString result: ' + rs.rows.item(0).upperString);
    });
  });
});

Here is a variation that uses a SQL parameter instead of a string literal:

document.addEventListener('deviceready', function() {
  var db = window.sqlitePlugin.openDatabase({name: 'test.db', location: 'default'});
  db.transaction(function(tr) {
    tr.executeSql('SELECT upper(?) AS upperString', ['Test string'], function(tr, rs) {
      console.log('Got upperString result: ' + rs.rows.item(0).upperString);
    });
  });
});

Moving forward

It is recommended to read through the usage and sample sections before building more complex applications. In general it is recommended to start by doing things one step at a time, especially when an application does not work as expected.

The new brodybits / cordova-sqlite-test-app sample is intended to be a boilerplate to reproduce and demonstrate any issues you may have with this plugin. You may also use it as a starting point to build a new app.

In case you get stuck with something please read through the support section and follow the instructions before raising an issue. Professional support is also available by contacting: sales@litehelpers.net

Plugin usage examples

Plugin tutorials

NOTICE: The above tutorial shows cordova plugin add cordova-sqlite-storage with the --save flag missing. Please be sure to use the --save flag to keep the plugins in config.xml in case of Cordova CLI pre-7.0 (automatic starting with Cordova CLI 7.0).

Other plugin tutorials wanted ref: litehelpers/Cordova-sqlite-storage#609

SQLite resources

Some other Cordova resources

Some apps using this plugin

TBD your app here

Security

Security of sensitive data

According to Web SQL Database API 7.2 Sensitivity of data:

User agents should treat persistently stored data as potentially sensitive; it's quite possible for e-mails, calendar appointments, health records, or other confidential documents to be stored in this mechanism.

To this end, user agents should ensure that when deleting data, it is promptly deleted from the underlying storage.

Unfortunately this plugin will not actually overwrite the deleted content unless the secure_delete PRAGMA is used.

SQL injection

As "strongly recommended" by Web SQL Database API 8.5 SQL injection:

Authors are strongly recommended to make use of the ? placeholder feature of the executeSql() method, and to never construct SQL statements on the fly.

Avoiding data loss

  • Double-check that the application code follows the documented API for SQL statements, parameter values, success callbacks, and error callbacks.
  • For standard Web SQL transactions include a transaction error callback with the proper logic that indicates to the user if data cannot be stored for any reason. In case of individual SQL error handlers be sure to indicate to the user if there is any issue with storing data.
  • For single statement and batch transactions include an error callback with logic that indicates to the user if data cannot be stored for any reason.

Deviations

Some known deviations from the Web SQL database standard

  • The window.sqlitePlugin.openDatabase static factory call takes a different set of parameters than the standard Web SQL window.openDatabase static factory call. In case you have to use existing Web SQL code with no modifications please see the Web SQL replacement tip below.
  • This plugin does not support the database creation callback or standard database versions. Please read the Database schema versions section below for tips on how to support database schema versioning.
  • This plugin does not support the synchronous Web SQL interfaces.
  • Known issues with handling of certain ASCII/UNICODE characters as described below.
  • It is possible to request a SQL statement list such as "SELECT 1; SELECT 2" within a single SQL statement string, however the plugin will only execute the first statement and silently ignore the others ref: litehelpers/Cordova-sqlite-storage#551
  • It is possible to insert multiple rows like: transaction.executeSql('INSERT INTO MyTable VALUES (?,?),(?,?)', ['Alice', 101, 'Betty', 102]); which was not supported by SQLite 3.6.19 as referenced by Web SQL API section 5. The iOS WebKit Web SQL implementation seems to support this as well.
  • Unlike the HTML5/Web SQL API this plugin handles executeSql calls with too few parameters without error reporting. In case of too many parameters this plugin reports error code 0 (SQLError.UNKNOWN_ERR) while Android/iOS (WebKit) Web SQL correctly reports error code 5 (SQLError.SYNTAX_ERR) ref: https://www.w3.org/TR/webdatabase/#dom-sqlexception-code-syntax
  • Positive and negative Infinity SQL parameter argument values are treated like null by this plugin on Android and iOS ref: litehelpers/Cordova-sqlite-storage#405
  • Positive and negative Infinity result values cause a crash on iOS/macOS cases ref: litehelpers/Cordova-sqlite-storage#405
  • Known issue(s) with of certain ASCII/UNICODE characters as described below.
  • Boolean true and false values are handled by converting them to the "true" and "false" TEXT string values, same as WebKit Web SQL on Android and iOS. This does not seem to be 100% correct as discussed in: litehelpers/Cordova-sqlite-storage#545
  • A number of uncategorized errors such as CREATE VIRTUAL TABLE USING bogus module are reported with error code 5 (SQLError.SYNTAX_ERR) on Android/iOS/macOS by both (WebKit) Web SQL and this plugin.
  • Issues with error code on Windows as well as Android with the androidDatabaseImplementation: 2 setting described below.
  • In case of an issue that causes an API function to throw an exception (Android/iOS WebKit) Web SQL includes includes a code member with value of 0 (SQLError.UNKNOWN_ERR) in the exception while the plugin includes no such code member.
  • This plugin supports some non-standard features as documented below.
  • Results of SELECT with BLOB data such as SELECT LOWER(X'40414243') AS myresult, SELECT X'40414243' AS myresult, or reading data stored by INSERT INTO MyTable VALUES (X'40414243') are not consistent on Android in case the built-in Android database is used (using the androidDatabaseImplementation: 2 setting in window.sqlitePlugin.openDatabase) or Windows. (These work with Android/iOS WebKit Web SQL and have been supported by SQLite for a number of years.)
  • Whole number parameter argument values such as 42, -101, or 1234567890123 are handled as INTEGER values by this plugin on Android, iOS (default UIWebView), and Windows while they are handled as REAL values by (WebKit) Web SQL and this plugin on macOS or iOS with WKWebView. This is evident in certain test operations such as SELECT ? as myresult or SELECT TYPEOF(?) as myresult and storage in a field with TEXT affinity.
  • INTEGER, REAL, +/- Infinity, NaN, null, undefined parameter argument values are handled as TEXT string values on Android in case the built-in Android database (androidDatabaseImplementation: 2 setting) is used. (This is evident in certain test operations such as SELECT ? as myresult or SELECT TYPEOF(?) as myresult and storage in a field with TEXT affinity.)
  • In case of invalid transaction callback arguments such as string values the plugin attempts to execute the transaction while (WebKit) Web SQL would throw an exception.
  • The plugin handles invalid SQL arguments array values such as false, true, or a string as if there were no arguments while (WebKit) Web SQL would throw an exception. NOTE: In case of a function in place of the SQL arguments array WebKit Web SQL would report a transaction error while the plugin would simply ignore the function.
  • In case of invalid SQL callback arguments such as string values the plugin may execute the SQL and signal transaction success or failure while (WebKit) Web SQL would throw an exception.
  • In certain cases such as transaction.executeSql(null) or transaction.executeSql(undefined) the plugin throws an exception while (WebKit) Web SQL indicates a transaction failure.
  • In certain cases such as transaction.executeSql() with no arguments (Android/iOS WebKit) Web SQL includes includes a code member with value of 0 (SQLError.UNKNOWN_ERR) in the exception while the plugin includes no such code member.
  • If the SQL arguments are passed in an Array subclass object where the constructor does not point to Array then the SQL arguments are ignored by the plugin.
  • The results data objects are not immutable as specified/implied by Web SQL API section 4.5.

Security of deleted data

See Security of sensitive data in the Security section above.

Other differences with WebKit Web SQL implementations

  • In case of ignored INSERT OR IGNORE statement WebKit Web SQL (Android/iOS) reports insertId with an old INSERT row id value while the plugin reports insertId: undefined.
  • In case of a SQL error handler that does not recover the transaction, WebKit Web SQL (Android/iOS) would incorrectly report error code 0 while the plugin would report the same error code as in the SQL error handler. (In case of an error with no SQL error handler then Android/iOS WebKit Web SQL would report the same error code that would have been reported in the SQL error hander.)
  • In case a transaction function throws an exception, the message and code if present are reported by the plugin but not by (WebKit) Web SQL.
  • SQL error messages are inconsistent on Windows and less descriptive on Android in case of the default Android-sqlite-evcore-native-driver-free implementation.
  • There are some other differences in the SQL error messages reported by WebKit Web SQL and this plugin.

Known issues

  • The iOS/macOS platform versions do not support certain rapidly repeated open-and-close or open-and-delete test scenarios due to how the implementation handles background processing
  • HIGH PRIORITY TODO: The default Android-sqlite-evcore-native-driver-free database access implementation does not currently handle control characters such as vertical tab, form feed, or backspace characters properly ref: litehelpers/Cordova-sqlite-evcore-extbuild-free#28
  • CRASH or INCORRECT HANDLING in case of Unicode emoji and other 4-octet UTF-8 characters (default Android-sqlite-evcore-native-driver-free database access implementation) ref: litehelpers/Cordova-sqlite-evcore-extbuild-free#7 and litehelpers/Cordova-sqlite-storage#564
  • It is possible to request a SQL statement list such as "SELECT 1; SELECT 2" within a single SQL statement string, however the plugin will only execute the first statement and silently ignore the others ref: litehelpers/Cordova-sqlite-storage#551
  • Execution of INSERT statement that affects multiple rows (due to SELECT cause or using TRIGGER(s), for example) reports incorrect rowsAffected on Android in case the built-in Android database used (using the androidDatabaseImplementation option in window.sqlitePlugin.openDatabase)
  • FIXED in this plugin version: Memory issue observed when adding a large number of records due to the JSON implementation which is improved in litehelpers / Cordova-sqlite-evcore-extbuild-free (GPL or commercial license terms)
  • Infinity (positive or negative) values are not supported on Android/iOS/macOS due to issues described above including a possible crash on iOS/macOS (ref: litehelpers/Cordova-sqlite-storage#405) or a hanging transaction queue on Android.
  • A stability issue was reported on the iOS platform version when in use together with SockJS client such as pusher-js at the same time (see litehelpers/Cordova-sqlite-storage#196). The workaround is to call sqlite functions and SockJS client functions in separate ticks (using setTimeout with 0 timeout).
  • SQL errors are reported with an INCORRECT error code (0) on Windows ref: litehelpers/Cordova-sqlite-storage#539. In certain cases SQL errors are also reported with error code 0 on Android in case the built-in Android database is used (using the androidDatabaseImplementation: 2 setting in window.sqlitePlugin.openDatabase).
  • Issue on default Android-sqlite-evcore-native-driver-free database access implementation in case of database file name with multi-byte UTF-8 characters ref: litehelpers/Cordova-sqlite-evcore-extbuild-free#25
  • The default Android-sqlite-evcore-native-driver-free database access implementation is known to crash on certain Android versions in case of database file names with emoji and other 4-byte UTF-8 characters ref: litehelpers/Cordova-sqlite-evcore-extbuild-free#26
  • Issue (truncation issue) with NULL characters ('\0\ or '\u0000') on Android (default Android-sqlite-evcore-native-driver-free database access implementation) and Windows ref: litehelpers/Cordova-sqlite-evcore-extbuild-free#27
  • Close/delete database bugs described below.
  • When a database is opened and deleted without closing, the iOS/macOS platform version is known to leak resources.
  • It is NOT possible to open multiple databases with the same name but in different locations (iOS/macOS platform version).

Some additional issues are tracked in open cordova-sqlite-storage bug-general issues and open cordova-sqlite-evcore-extbuild-free bug-general issues.

Other limitations

  • The db version, display name, and size parameter values are not supported and will be ignored. (No longer supported by the API)
  • Absolute and relative subdirectory path(s) are not tested or supported.
  • This plugin will not work before the callback for the 'deviceready' event has been fired, as described in Usage. (This is consistent with the other Cordova plugins.)
  • Extremely large records are not supported by this plugin. It is recommended to store images and similar binary data in separate files. TBD: specify maximum record. For future consideration: support in a plugin version such as litehelpers / Cordova-sqlite-evcore-extbuild-free (GPL or commercial license terms).
  • This plugin version will not work within a web worker (not properly supported by the Cordova framework). Use within a web worker is supported for Android/iOS in litehelpers / cordova-sqlite-evmax-ext-workers-legacy-build-free (GPL or premium commercial license terms).
  • In-memory database db=window.sqlitePlugin.openDatabase({name: ':memory:', ...}) is currently not supported.
  • The Android platform version cannot properly support more than 100 open database files due to the threading model used.
  • SQL error messages reported by Windows platform version are not consistent with Android/iOS/macOS platform versions.
  • UNICODE \u2028 (line separator) and \u2029 (paragraph separator) characters are currently not supported and known to be broken on iOS, macOS, and Android platform versions due to JSON issues reported in Cordova bug CB-9435 and cordova/cordova-discuss#57. This is fixed with a workaround for iOS/macOS in: litehelpers / Cordova-sqlite-evplus-legacy-free and litehelpers / Cordova-sqlite-evplus-legacy-attach-detach-free (GPL or special commercial license terms) as well as litehelpers / cordova-sqlite-evmax-ext-workers-legacy-build-free (GPL or premium commercial license terms).
  • Storage and retrieval of BLOB data type is not supported consistently on all platforms according to HTML5/Web SQL DRAFT API (issue on Windows). SELECT BLOB in Base64 format using BASE64 function (described elsewhere in this document) is supported by this plugin version (GPL or commercial license options) as well as litehelpers / cordova-sqlite-ext (permissive license terms); SELECT BLOB in HEX format using HEX function is also supported. INLINE BLOB values such as `X'010203' are supported by the SQLite syntax on all platforms. FUTURE TBD equivalent to UNHEX (supported in MySQL) or conversion of Base-64 string to BLOB is desired.
  • Database file names with multi-byte UTF-8 characters such as accented characters or other international characters are NOT tested and not expected to work consistently across all platforms. The default Android-sqlite-evcore-native-driver-free database access implementation is known to crash on certain Android versions in case of database file names with emoji and other 4-byte UTF-8 characters ref: litehelpers/Cordova-sqlite-evcore-extbuild-free#26
  • Truncation in case of UNICODE \u0000 (same as \0) character on Android (default Android-sqlite-evcore-native-driver-free database access implementation) and Windows ref: litehelpers/Cordova-sqlite-evcore-extbuild-free#27
  • Case-insensitive matching and other string manipulations on Unicode characters, which is provided by optional ICU integration in the sqlite source and working with recent versions of Android, is not supported for any target platforms.
  • The iOS/macOS platform version uses a thread pool but with only one thread working at a time due to "synchronized" database access.
  • Some extreme large query results may be slow, especially on iOS/macOS, due to the JSON implementation. Improvements for iOS/macOS are available in litehelpers / cordova-sqlite-evplus-ext-legacy-build-free and litehelpers / Cordova-sqlite-evplus-legacy-attach-detach-free (GPL or special commercial license terms). FUTURE (TODO) will be available in a newer evplus plugin version (GPL or special commercial license terms).
  • ATTACH to another database file is not supported by this version branch. Attach/detach is supported (along with the memory and iOS UNICODE \u2028 line separator / \u2029 paragraph separator fixes) in litehelpers / Cordova-sqlite-evplus-legacy-attach-detach-free (GPL or special commercial license terms).
  • UPDATE/DELETE with LIMIT or ORDER BY is not supported.
  • WITH clause is not supported on some older Android platform versions in case the androidDatabaseImplementation: 2 (built-in android.database implementation) option is used.
  • User-defined savepoints are not supported and not expected to be compatible with the transaction locking mechanism used by this plugin. In addition, the use of BEGIN/COMMIT/ROLLBACK statements is not supported.
  • Problems have been reported when using this plugin with Crosswalk (for Android). It may help to install Crosswalk as a plugin instead of using Crosswalk to create the project.
  • Does not work with axemclion / react-native-cordova-plugin since the window.sqlitePlugin object is not properly exported (ES5 feature). It is recommended to use andpor / react-native-sqlite-storage for SQLite database access with React Native Android/iOS instead.

Additional limitations are tracked in marked cordova-sqlite-storage doc-todo issues and marked cordova-sqlite-evcore-extbuild-free doc-todo issues.

Further testing needed

  • Integration with PhoneGap developer app
  • Use within InAppBrowser
  • Use within an iframe (see litehelpers/Cordova-sqlite-storage#368 (comment))
  • Date/time handling
  • Maximum record size supported
  • Actual behavior when using SAVEPOINT(s)
  • R-Tree is not fully tested with Android
  • UNICODE characters not fully tested
  • ORDER BY RANDOM() (ref: litehelpers/Cordova-sqlite-storage#334)
  • UPDATE/DELETE with LIMIT or ORDER BY (newer Android/iOS versions)
  • Integration with JXCore for Cordova (must be built without sqlite(3) built-in)
  • Delete an open database inside a statement or transaction callback.
  • WITH clause (not supported by some older sqlite3 versions)
  • Handling of invalid transaction and transaction.executeSql arguments
  • Use of database locations on macOS
  • Extremely large and small INTEGER and REAL values ref: litehelpers/Cordova-sqlite-storage#627
  • More emojis and other 4-octet UTF-8 characters
  • ?NNN/:AAA/@AAAA/$AAAA parameter placeholders ref: https://www.sqlite.org/lang_expr.html#varparam, https://www.sqlite.org/c3ref/bind_blob.html)
  • Single-statement and SQL batch transaction calls with invalid arguments (TBD behavior subject to change)

Some tips and tricks

  • If you run into problems and your code follows the asynchronous HTML5/Web SQL transaction API, you can try opening a test database using window.openDatabase and see if you get the same problems.
  • In case your database schema may change, it is recommended to keep a table with one row and one column to keep track of your own schema version number. It is possible to add it later. The recommended schema update procedure is described below.

Pitfalls

Some common pitfall(s)

  • If a database is opened using the standard window.openDatabase call it will not have any of the benefits of this plugin and features such as the sqlBatch call would not be available.
  • It is NOT allowed to execute sql statements on a transaction that has already finished, as described below. This is consistent with the HTML5/Web SQL API.
  • The plugin class name starts with "SQL" in capital letters, but in Javascript the sqlitePlugin object name starts with "sql" in small letters.
  • Attempting to open a database before receiving the 'deviceready' event callback.
  • Inserting STRING into ID field
  • Auto-vacuum is NOT enabled by default. It is recommended to periodically VACUUM the database. If no form of VACUUM or PRAGMA auto_vacuum is used then sqlite will automatically reuse deleted data space for new data but the database file will never shrink. For reference: http://www.sqlite.org/pragma.html#pragma_auto_vacuum and litehelpers/Cordova-sqlite-storage#646
  • Transactions on a database are run sequentially. A large transaction could block smaller transactions requested afterwards.

Some weird pitfall(s)

Angular/ngCordova/Ionic-related pitfalls

Windows platform pitfalls

  • This plugin does not work with the default "Any CPU" target. A specific, valid CPU target platform must be specified.
  • It is not allowed to change the app ID in the Windows platform project. As described in the Windows platform usage of the Installing section a Windows-specific app ID may be declared using the windows-identity-name attribute or "WindowsStoreIdentityName" setting.
  • A problem locating SQLite3.md generally means that there was a problem building the C++ library.

General Cordova pitfalls

Documented in: brodybits / Avoiding-some-Cordova-pitfalls

General SQLite pitfalls

From https://www.sqlite.org/datatype3.html#section_1:

SQLite uses a more general dynamic type system.

This is generally nice to have, especially in conjunction with a dynamically typed language such as JavaScript. Here are some major SQLite data typing principles:

However there are some possible gotchas:

  1. From https://www.sqlite.org/datatype3.html#section_3_2:

Note that a declared type of "FLOATING POINT" would give INTEGER affinity, not REAL affinity, due to the "INT" at the end of "POINT". And the declared type of "STRING" has an affinity of NUMERIC, not TEXT.

  1. From ibid: a column declared as "DATETIME" has NUMERIC affinity, which gives no hint whether an INTEGER Unix time value, a REAL Julian time value, or possibly even a TEXT ISO8601 date/time string may be stored (further refs: https://www.sqlite.org/datatype3.html#section_2_2, https://www.sqlite.org/datatype3.html#section_3)

From https://groups.google.com/forum/#!topic/phonegap/za7z51_fKRw, as discussed in litehelpers/Cordova-sqlite-storage#546: it was discovered that are some more points of possible confusion with date/time. For example, there is also a datetime function that returns date/time in TEXT string format. This should be considered a case of "DATETIME" overloading since SQLite is not case sensitive. This could really become confusing if different programmers or functions consider date/time to be stored in different ways.

FUTURE TBD: Proper date/time handling will be further tested and documented at some point.

Major TODOs

For future considertion

Alternatives

Comparison of sqlite plugin versions

  • litehelpers / Cordova-sqlite-storage - core plugin version for Android/iOS/macOS/Windows (permissive license terms)
  • litehelpers / cordova-sqlite-ext - plugin version with REGEXP (Android/iOS/macOS), SELECT BLOB in Base64 format (all platforms Android/iOS/macOS/Windows), and pre-populated databases (all platforms Android/iOS/macOS/Windows). Permissive license terms.
  • litehelpers / cordova-sqlite-legacy - support for Windows 8.1/Windows Phone 8.1 along with Android/iOS/macOS/Windows 10, with support for REGEXP (Android/iOS/macOS), SELECT BLOB in Base64 format (all platforms Android/iOS/macOS/Windows), and pre-populated databases (all platforms Android/iOS/macOS/Windows). Limited updates. Permissive license terms.
  • brodybits / cordova-sqlite-legacy-build-support - maintenance of WP8 platform version along with Windows 8.1/Windows Phone 8.1 and the other supported platforms Android/iOS/macOS/Windows 10; limited support for PhoneGap CLI/PhoneGap Build/plugman/Intel XDK; limited testing; limited updates. Permissive license terms.
  • litehelpers / Cordova-sqlcipher-adapter - supports SQLCipher for Android/iOS/macOS/Windows
  • litehelpers / Cordova-sqlite-evcore-extbuild-free - Enhancements for Android: JSON and SQL statement handling implemented in C, supports larger transactions and handles large SQL batches in less than half the time as this plugin version. Supports arbitrary database location on Android. Support for build environments such as PhoneGap Build and Intel XDK. Also includes REGEXP (Android/iOS/macOS) and SELECT BLOB in Base64 format (all platforms Android/iOS/macOS/Windows). GPL or commercial license terms.
  • litehelpers / cordova-sqlite-evplus-ext-legacy-build-free - internal memory improvements to support larger transactions (Android/iOS/macOS) and fix to support all Unicode characters (iOS). (GPL or special commercial license terms).
  • litehelpers / Cordova-sqlite-evplus-legacy-attach-detach-free - plugin version with support for ATTACH, includes internal memory improvements to support larger transactions (Android/iOS/macOS) and fix to support all Unicode characters (GPL or special commercial license terms).
  • litehelpers / cordova-sqlite-evmax-ext-workers-legacy-build-free - plugin version with support for web workers, includes internal memory improvements to support larger transactions (Android/iOS) and fix to support all Unicode characters (iOS). (GPL or premium commercial license terms).
  • Adaptation for React Native Android and iOS: andpor / react-native-sqlite-storage (permissive license terms)
  • Original plugin version for iOS (with a non-standard, outdated transaction API): davibe / Phonegap-SQLitePlugin (permissive license terms)

Other SQLite access projects

Alternative storage solutions

Usage

Self-test functions

To verify that both the Javascript and native part of this plugin are installed in your application:

window.sqlitePlugin.echoTest(successCallback, errorCallback);

To verify that this plugin is able to open a database (named ___$$$___litehelpers___$$$___test___$$$___.db), execute the CRUD (create, read, update, and delete) operations, and clean it up properly:

window.sqlitePlugin.selfTest(successCallback, errorCallback);

IMPORTANT: Please wait for the 'deviceready' event (see below for an example).

General

  • Drop-in replacement for HTML5/Web SQL API: the only change should be to replace the static window.openDatabase() factory call with window.sqlitePlugin.openDatabase(), with parameters as documented below. Some known deviations are documented in TBD newer plugin version branches. Reports of any additional deviations would be appreciated.
  • Single-page application design is recommended.
  • In case of a multi-page application the JavaScript used by each page must use sqlitePlugin.openDatabase to open the database access handle object before it can access the data.

NOTE: If a sqlite statement in a transaction fails with an error, the error handler must return false in order to recover the transaction. This is correct according to the HTML5/Web SQL API standard. This is different from the WebKit implementation of Web SQL in Android and iOS which recovers the transaction if a sql error hander returns a non-true value.

See the Sample section for a sample with detailed explanations.

Opening a database

To open a database access handle object (in the new default location):

var db = window.sqlitePlugin.openDatabase({name: 'my.db', location: 'default'}, successcb, errorcb);

WARNING: The new "default" location value is NOT the same as the old default location and would break an upgrade for an app that was using the old default value (0) on iOS.

WARNING 2: As described above: by default this plugin uses a non-standard Android-sqlite-evcore-native-driver-free sqlite database access implementation on Android. In case an application access the same database using multiple plugins there is a risk of data corruption (ref: litehelpers/Cordova-sqlite-storage#626) as described in http://ericsink.com/entries/multiple_sqlite_problem.html and https://www.sqlite.org/howtocorrupt.html. The workaround is to use the androidDatabaseImplementation: 2 setting as described in the Android sqlite implementation section below.

To specify a different location (affects iOS/macOS only):

var db = window.sqlitePlugin.openDatabase({name: 'my.db', iosDatabaseLocation: 'Library'}, successcb, errorcb);

where the iosDatabaseLocation option may be set to one of the following choices:

  • default: Library/LocalDatabase subdirectory - NOT visible to iTunes and NOT backed up by iCloud
  • Library: Library subdirectory - backed up by iCloud, NOT visible to iTunes
  • Documents: Documents subdirectory - visible to iTunes and backed up by iCloud

WARNING: Again, the new "default" iosDatabaseLocation value is NOT the same as the old default location and would break an upgrade for an app using the old default value (0) on iOS.

ALTERNATIVE (deprecated):

  • var db = window.sqlitePlugin.openDatabase({name: "my.db", location: 1}, successcb, errorcb);

with the location option set to one the following choices (affects iOS only):

  • 0 (default): Documents - visible to iTunes and backed up by iCloud
  • 1: Library - backed up by iCloud, NOT visible to iTunes
  • 2: Library/LocalDatabase - NOT visible to iTunes and NOT backed up by iCloud (same as using "default")

No longer supported (see tip below to overwrite window.openDatabase): var db = window.sqlitePlugin.openDatabase("myDatabase.db", "1.0", "Demo", -1);

IMPORTANT: Please wait for the 'deviceready' event, as in the following example:

// Wait for Cordova to load
document.addEventListener('deviceready', onDeviceReady, false);

// Cordova is ready
function onDeviceReady() {
  var db = window.sqlitePlugin.openDatabase({name: 'my.db', location: 'default'});
  // ...
}

The successcb and errorcb callback parameters are optional but can be extremely helpful in case anything goes wrong. For example:

window.sqlitePlugin.openDatabase({name: 'my.db', location: 'default'}, function(db) {
  db.transaction(function(tx) {
    // ...
  }, function(err) {
    console.log('Open database ERROR: ' + JSON.stringify(err));
  });
});

If any sql statements or transactions are attempted on a database object before the openDatabase result is known, they will be queued and will be aborted in case the database cannot be opened.

DATABASE NAME NOTES:

  • Database file names with slash (/) character(s) are not supported and not expected to work.
  • Database file names with ASCII control characters such as tab, vertical tab, carriage return, line feed, form feed, and backspace are not supported and do not work on Windows.
  • Some other ASCII characters not supported and not working on Windows: * < > ? \ " |
  • Database file names with emojis and other 4-octet UTF-8 characters are NOT RECOMMENDED.

OTHER NOTES:

  • The database file name should include the extension, if desired.
  • It is possible to open multiple database access handle objects for the same database.
  • The database handle access object can be closed as described below.

Web SQL replacement tip:

To overwrite window.openDatabase:

window.openDatabase = function(dbname, ignored1, ignored2, ignored3) {
  return window.sqlitePlugin.openDatabase({name: dbname, location: 'default'});
};

iCloud backup notes

As documented in the "A User’s iCloud Storage Is Limited" section of iCloudFundamentals in Mac Developer Library iCloud Design Guide (near the beginning):

  • DO store the following in iCloud:
    • [other items omitted]
    • Change log files for a SQLite database (a SQLite database’s store file must never be stored in iCloud)
  • DO NOT store the following in iCloud:
    • [items omitted]
- iCloudFundamentals in Mac Developer Library iCloud Design Guide

How to disable iCloud backup

Use the location or iosDatabaseLocation option in sqlitePlugin.openDatabase() to store the database in a subdirectory that is NOT backed up to iCloud, as described in the section below.

NOTE: Changing BackupWebStorage in config.xml has no effect on a database created by this plugin. BackupWebStorage applies only to local storage and/or Web SQL storage created in the WebView (not using this plugin). For reference: phonegap/build#338 (comment)

Android sqlite implementation

By default, this plugin uses litehelpers / Android-sqlite-evcore-native-driver-free with the performance and memory usage enhancements. To use the built-in Android database classes instead:

var db = window.sqlitePlugin.openDatabase({name: 'my.db', location: 'default', androidDatabaseImplementation: 2});

IMPORTANT:

Workaround for Android db locking issue

litehelpers/Cordova-sqlite-storage#193 reported (as observed by a number of app developers in the past) that when using the androidDatabaseImplementation: 2 setting on certain Android versions and if the app is stopped or aborted without closing the database then:

  • (sometimes) there is an unexpected database lock
  • the data that was inserted is lost.

The cause of this issue remains unknown. Of interest: android / platform_external_sqlite commit d4f30d0d15 which references and includes the sqlite commit at: http://www.sqlite.org/src/info/6c4c2b7dba

This is not an issue when the default litehelpers / Android-sqlite-evcore-native-driver-free database implementation is used, which is the case when no androidDatabaseImplementation setting is used.

There is an optional workaround that simply closes and reopens the database file at the end of every transaction that is committed. The workaround is enabled by opening the database with options as follows:

var db = window.sqlitePlugin.openDatabase({
  name: 'my.db',
  location: 'default',
  androidDatabaseImplementation: 2,
  androidLockWorkaround: 1
});

IMPORTANT NOTE: This workaround is only applied when using db.sqlBatch or db.transaction(), not applied when running executeSql() on the database object.

SQL transactions

The following types of SQL transactions are supported by this plugin version:

  • Single-statement transactions
  • SQL batch transactions
  • Standard asynchronous transactions

NOTE: Transaction requests are kept in one queue per database and executed in sequential order, according to the HTML5/Web SQL API.

WARNING: It is possible to request a SQL statement list such as "SELECT 1; SELECT 2" within a single SQL statement string, however the plugin will only execute the first statement and silently ignore the others. This could result in data loss if such a SQL statement list with any INSERT or UPDATE statement(s) are included. For reference: litehelpers/Cordova-sqlite-storage#551

Single-statement transactions

Sample with INSERT:

db.executeSql('INSERT INTO MyTable VALUES (?)', ['test-value'], function (resultSet) {
  console.log('resultSet.insertId: ' + resultSet.insertId);
  console.log('resultSet.rowsAffected: ' + resultSet.rowsAffected);
}, function(error) {
  console.log('SELECT error: ' + error.message);
});

Sample with SELECT:

db.executeSql("SELECT LENGTH('tenletters') AS stringlength", [], function (resultSet) {
  console.log('got stringlength: ' + resultSet.rows.item(0).stringlength);
}, function(error) {
  console.log('SELECT error: ' + error.message);
});

NOTE/minor bug: The object returned by resultSet.rows.item(rowNumber) is not immutable. In addition, multiple calls to resultSet.rows.item(rowNumber) with the same rowNumber on the same resultSet object return the same object. For example, the following code will show Second uppertext result: ANOTHER:

db.executeSql("SELECT UPPER('First') AS uppertext", [], function (resultSet) {
  var obj1 = resultSet.rows.item(0);
  obj1.uppertext = 'ANOTHER';
  console.log('Second uppertext result: ' + resultSet.rows.item(0).uppertext);
  console.log('SELECT error: ' + error.message);
});

SQL batch transactions

Sample:

db.sqlBatch([
  'DROP TABLE IF EXISTS MyTable',
  'CREATE TABLE MyTable (SampleColumn)',
  [ 'INSERT INTO MyTable VALUES (?)', ['test-value'] ],
], function() {
  db.executeSql('SELECT * FROM MyTable', [], function (resultSet) {
    console.log('Sample column value: ' + resultSet.rows.item(0).SampleColumn);
  });
}, function(error) {
  console.log('Populate table error: ' + error.message);
});

In case of an error, all changes in a sql batch are automatically discarded using ROLLBACK.

Standard asynchronous transactions

Standard asynchronous transactions follow the HTML5/Web SQL API which is very well documented and uses BEGIN and COMMIT or ROLLBACK to keep the transactions failure-safe. Here is a simple example:

db.transaction(function(tx) {
  tx.executeSql('DROP TABLE IF EXISTS MyTable');
  tx.executeSql('CREATE TABLE MyTable (SampleColumn)');
  tx.executeSql('INSERT INTO MyTable VALUES (?)', ['test-value'], function(tx, resultSet) {
    console.log('resultSet.insertId: ' + resultSet.insertId);
    console.log('resultSet.rowsAffected: ' + resultSet.rowsAffected);
  }, function(tx, error) {
    console.log('INSERT error: ' + error.message);
  });
}, function(error) {
  console.log('transaction error: ' + error.message);
}, function() {
  console.log('transaction ok');
});

In case of a read-only transaction, it is possible to use readTransaction which will not use BEGIN, COMMIT, or ROLLBACK:

db.readTransaction(function(tx) {
  tx.executeSql("SELECT UPPER('Some US-ASCII text') AS uppertext", [], function(tx, resultSet) {
    console.log("resultSet.rows.item(0).uppertext: " + resultSet.rows.item(0).uppertext);
  }, function(tx, error) {
    console.log('SELECT error: ' + error.message);
  });
}, function(error) {
  console.log('transaction error: ' + error.message);
}, function() {
  console.log('transaction ok');
});

WARNING: It is NOT allowed to execute sql statements on a transaction after it has finished. Here is an example from the Populating Cordova SQLite storage with the JQuery API post at http://www.brodybits.com/cordova/sqlite/api/jquery/2015/10/26/populating-cordova-sqlite-storage-with-the-jquery-api.html:

  // BROKEN SAMPLE:
  var db = window.sqlitePlugin.openDatabase({name: "test.db"});
  db.executeSql("DROP TABLE IF EXISTS tt");
  db.executeSql("CREATE TABLE tt (data)");

  db.transaction(function(tx) {
    $.ajax({
      url: 'https://api.github.com/users/litehelpers/repos',
      dataType: 'json',
      success: function(res) {
        console.log('Got AJAX response: ' + JSON.stringify(res));
        $.each(res, function(i, item) {
          console.log('REPO NAME: ' + item.name);
          tx.executeSql("INSERT INTO tt values (?)", JSON.stringify(item.name));
        });
      }
    });
  }, function(e) {
    console.log('Transaction error: ' + e.message);
  }, function() {
    // Check results:
    db.executeSql('SELECT COUNT(*) FROM tt', [], function(res) {
      console.log('Check SELECT result: ' + JSON.stringify(res.rows.item(0)));
    });
  });

You can find more details and a step-by-step description how to do this right in the Populating Cordova SQLite storage with the JQuery API post at: http://www.brodybits.com/cordova/sqlite/api/jquery/2015/10/26/populating-cordova-sqlite-storage-with-the-jquery-api.html

NOTE/minor bug: Just like the single-statement transaction described above, the object returned by resultSet.rows.item(rowNumber) is not immutable. In addition, multiple calls to resultSet.rows.item(rowNumber) with the same rowNumber on the same resultSet object return the same object. For example, the following code will show Second uppertext result: ANOTHER:

db.readTransaction(function(tx) {
  tx.executeSql("SELECT UPPER('First') AS uppertext", [], function(tx, resultSet) {
    var obj1 = resultSet.rows.item(0);
    obj1.uppertext = 'ANOTHER';
    console.log('Second uppertext result: ' + resultSet.rows.item(0).uppertext);
    console.log('SELECT error: ' + error.message);
  });
});

FUTURE TBD: It should be possible to get a row result object using resultSet.rows[rowNumber], also in case of a single-statement transaction. This is non-standard but is supported by the Chrome desktop browser.

SELECT BLOB data as BASE64

db.readTransaction(function(tx) {
  tx.executeSql("SELECT BASE64(data) AS base64_data FROM MyTable", [], function(tx, resultSet) {
    console.log('BLOB data (base64): ' + resultSet.rows.item(0).base64_data);
  });
});

Background processing

The threading model depends on which platform version is used:

  • For Android, one background thread per db;
  • for iOS/macOS, background processing using a very limited thread pool (only one thread working at a time);
  • for Windows, no background processing.

Sample with PRAGMA feature

Creates a table, adds a single entry, then queries the count to check if the item was inserted as expected. Note that a new transaction is created in the middle of the first callback.

// Wait for Cordova to load
document.addEventListener('deviceready', onDeviceReady, false);

// Cordova is ready
function onDeviceReady() {
  var db = window.sqlitePlugin.openDatabase({name: 'my.db', location: 'default'});

  db.transaction(function(tx) {
    tx.executeSql('DROP TABLE IF EXISTS test_table');
    tx.executeSql('CREATE TABLE IF NOT EXISTS test_table (id integer primary key, data text, data_num integer)');

    // demonstrate PRAGMA:
    db.executeSql("pragma table_info (test_table);", [], function(res) {
      console.log("PRAGMA res: " + JSON.stringify(res));
    });

    tx.executeSql("INSERT INTO test_table (data, data_num) VALUES (?,?)", ["test", 100], function(tx, res) {
      console.log("insertId: " + res.insertId + " -- probably 1");
      console.log("rowsAffected: " + res.rowsAffected + " -- should be 1");

      db.transaction(function(tx) {
        tx.executeSql("select count(id) as cnt from test_table;", [], function(tx, res) {
          console.log("res.rows.length: " + res.rows.length + " -- should be 1");
          console.log("res.rows.item(0).cnt: " + res.rows.item(0).cnt + " -- should be 1");
        });
      });

    }, function(e) {
      console.log("ERROR: " + e.message);
    });
  });
}

NOTE: PRAGMA statements must be executed in executeSql() on the database object (i.e. db.executeSql()) and NOT within a transaction.

Sample with transaction-level nesting

In this case, the same transaction in the first executeSql() callback is being reused to run executeSql() again.

// Wait for Cordova to load
document.addEventListener('deviceready', onDeviceReady, false);

// Cordova is ready
function onDeviceReady() {
  var db = window.sqlitePlugin.openDatabase({name: 'my.db', location: 'default'});

  db.transaction(function(tx) {
    tx.executeSql('DROP TABLE IF EXISTS test_table');
    tx.executeSql('CREATE TABLE IF NOT EXISTS test_table (id integer primary key, data text, data_num integer)');

    tx.executeSql("INSERT INTO test_table (data, data_num) VALUES (?,?)", ["test", 100], function(tx, res) {
      console.log("insertId: " + res.insertId + " -- probably 1");
      console.log("rowsAffected: " + res.rowsAffected + " -- should be 1");

      tx.executeSql("select count(id) as cnt from test_table;", [], function(tx, res) {
        console.log("res.rows.length: " + res.rows.length + " -- should be 1");
        console.log("res.rows.item(0).cnt: " + res.rows.item(0).cnt + " -- should be 1");
      });

    }, function(tx, e) {
      console.log("ERROR: " + e.message);
    });
  });
}

This case will also works with Safari (WebKit), assuming you replace window.sqlitePlugin.openDatabase with window.openDatabase.

Close a database object

This will invalidate all handle access handle objects for the database that is closed:

db.close(successcb, errorcb);

It is OK to close the database within a transaction callback but NOT within a statement callback. The following example is OK:

db.transaction(function(tx) {
  tx.executeSql("SELECT LENGTH('tenletters') AS stringlength", [], function(tx, res) {
    console.log('got stringlength: ' + res.rows.item(0).stringlength);
  });
}, function(error) {
  // OK to close here:
  console.log('transaction error: ' + error.message);
  db.close();
}, function() {
  // OK to close here:
  console.log('transaction ok');
  db.close(function() {
    console.log('database is closed ok');
  });
});

The following example is NOT OK:

// BROKEN:
db.transaction(function(tx) {
  tx.executeSql("SELECT LENGTH('tenletters') AS stringlength", [], function(tx, res) {
    console.log('got stringlength: ' + res.rows.item(0).stringlength);
    // BROKEN - this will trigger the error callback:
    db.close(function() {
      console.log('database is closed ok');
    }, function(error) {
      console.log('ERROR closing database');
    });
  });
});

BUG: It is currently NOT possible to close a database in a db.executeSql callback. For example:

// BROKEN DUE TO BUG:
db.executeSql("SELECT LENGTH('tenletters') AS stringlength", [], function (res) {
  var stringlength = res.rows.item(0).stringlength;
  console.log('got stringlength: ' + res.rows.item(0).stringlength);

  // BROKEN - this will trigger the error callback DUE TO BUG:
  db.close(function() {
    console.log('database is closed ok');
  }, function(error) {
    console.log('ERROR closing database');
  });
});

SECOND BUG: When a database connection is closed, any queued transactions are left hanging. TODO: All pending transactions should be errored whenever a database connection is closed.

NOTE: As described above, if multiple database access handle objects are opened for the same database and one database handle access object is closed, the database is no longer available for the other database handle objects. Possible workarounds:

  • It is still possible to open one or more new database handle objects on a database that has been closed.
  • It should be OK not to explicitly close a database handle since database transactions are ACID compliant and the app's memory resources are cleaned up by the system upon termination.

FUTURE TBD: dispose method on the database access handle object, such that a database is closed once all access handle objects are disposed.

Delete a database

window.sqlitePlugin.deleteDatabase({name: 'my.db', location: 'default'}, successcb, errorcb);

with location or iosDatabaseLocation parameter required as described above for openDatabase (affects iOS/macOS only)

BUG: When a database is deleted, any queued transactions for that database are left hanging. TODO: All pending transactions should be errored when a database is deleted.

Database schema versions

The transactional nature of the API makes it relatively straightforward to manage a database schema that may be upgraded over time (adding new columns or new tables, for example). Here is the recommended procedure to follow upon app startup:

  • Check your database schema version number (you can use db.executeSql since it should be a very simple query)
  • If your database needs to be upgraded, do the following within a single transaction to be failure-safe:

IMPORTANT: Since we cannot be certain when the users will actually update their apps, old schema versions will have to be supported for a very long time.

Use with Ionic/ngCordova/Angular

Ionic 2

Tutorials with Ionic 2:

Sample for Ionic 2 wanted ref: litehelpers/Cordova-sqlite-storage#585

Ionic 1

Tutorial with Ionic 1: https://blog.nraboy.com/2014/11/use-sqlite-instead-local-storage-ionic-framework/

A sample for Ionic 1 is provided at: litehelpers / Ionic-sqlite-database-example

Documentation at: http://ngcordova.com/docs/plugins/sqlite/

Other resource (apparently for Ionic 1): https://www.packtpub.com/books/content/how-use-sqlite-ionic-store-data

NOTE: Some Ionic and other Angular pitfalls are described above.

Installing

Easy installation with Cordova CLI tool

cordova plugin add https://github.com/litehelpers/cordova-sqlite-evcore-legacy-ext-common-free # --save RECOMMENDED for Cordova CLI pre-7.0

Additional Cordova CLI NOTES:

  • It is recommended to add all plugins including standard plugins such as cordova-plugin-whitelist with the --save flag to track these in config.xml (save is automatic in Cordova CLI 7.0/+).
  • In general there is no need to keep the Cordova platforms subdirectory tree in source code control (such as git). In case all plugins are added with the --save flag (save is automatic in Cordova CLI 7.0/+) then there is no need to keep the plugins subdirectory tree in source code control either.
  • It is MANDATORY to use cordova prepare in case of cordova-ios older than 4.3.0 (Cordova CLI 6.4.0).
  • In case of problems with building and running it is recommended to try again after cordova prepare.
  • If you cannot build for a platform after cordova prepare, you may have to remove the platform and add it again, such as:
cordova platform rm ios
cordova platform add ios

or more drastically:

rm -rf platforms
cordova platform add ios

Plugin installation sources

Windows platform usage

This plugin can be non-intuitive to use on Windows since it includes a native SQLite3 library that is built as a part of the Cordova app. Here are some requirements:

Installation test

Easy installation test

Use window.sqlitePlugin.echoTest and/or window.sqlitePlugin.selfTest as described above (please wait for the deviceready event).

Quick installation test

Assuming your app has a recent template as used by the Cordova create script, add the following code to the onDeviceReady function, after app.receivedEvent('deviceready');:

  window.sqlitePlugin.openDatabase({ name: 'hello-world.db', location: 'default' }, function (db) {
    db.executeSql("select length('tenletters') as stringlength", [], function (res) {
      var stringlength = res.rows.item(0).stringlength;
      console.log('got stringlength: ' + stringlength);
      document.getElementById('deviceready').querySelector('.received').innerHTML = 'stringlength: ' + stringlength;
   });
  });

Support

Free support policy

Free support is provided on a best-effort basis and is only available in public forums. Please follow the steps below to be sure you have done your best before requesting help.

Professional support

Professional support is available by contacting: sales@litehelpers.net

For more information: http://litehelpers.net/

Before seeking help

First steps:

and check the following:

  • You are using the latest version of the Plugin (Javascript and platform-specific part) from this repository.
  • The plugin is installed correctly.
  • You have included the correct version of cordova.js.
  • You have registered the plugin properly in config.xml.

If you still cannot get something to work:

Issues with AJAX

General: As documented above with a negative example the application must wait for the AJAX query to finish before starting a transaction and adding the data elements.

In case of issues it is recommended to rework the reproduction program insert the data from a JavaScript object after a delay. There is already a test function for this in brodybits / cordova-sqlite-test-app.

FUTURE TBD examples

Test program to seek help

If you continue to see the issue: please make the simplest test program possible based on brodybits / cordova-sqlite-test-app to demonstrate the issue with the following characteristics:

  • it completely self-contained, i.e. it is using no extra libraries beyond cordova & SQLitePlugin.js;
  • if the issue is with adding data to a table, that the test program includes the statements you used to open the database and create the table;
  • if the issue is with retrieving data from a table, that the test program includes the statements you used to open the database, create the table, and enter the data you are trying to retrieve.

What will be supported for free

It is recommended to make a small, self-contained test program based on brodybits / cordova-sqlite-test-app that can demonstrate your problem and post it. Please do not use any other plugins or frameworks than are absolutely necessary to demonstrate your problem.

In case of a problem with a pre-populated database, please post your entire project.

What is NOT supported for free

  • Debugging, optimization, and other help with application code.

What information is needed for help

Please include the following:

  • Which platform(s) (Android/iOS/macOS/Windows 8.1/Windows Phone 8.1/Windows 10)
  • Clear description of the issue
  • A small, complete, self-contained program that demonstrates the problem, preferably as a Github project, based on brodybits / cordova-sqlite-test-app. ZIP/TGZ/BZ2 archive available from a public link is OK. No RAR or other such formats please.
  • In case of a Windows build problem please capture the entire compiler output.

Please do NOT use any of these formats

  • screen casts or videos
  • RAR or similar archive formats
  • Intel, MS IDE, or similar project formats unless absolutely necessary

Where to request help

Please include the information described above otherwise.

Unit tests

Unit testing is done in spec.

running tests from shell

To run the tests from *nix shell, simply do either:

./bin/test.sh ios

or for Android:

./bin/test.sh android

To run from a windows powershell (here is a sample for android target):

.\bin\test.ps1 android

Adapters

GENERAL: The adapters described here are community maintained.

Lawnchair Adapter

PouchDB

Adapters wanted

  • IndexedDBShim adapter (possibly based on IndexedDBShim)

Sample

Contributed by @Mikejo5000 (Mike Jones) from Microsoft.

Interact with the SQLite database

The SQLite storage plugin sample allows you to execute SQL statements to interact with the database. The code snippets in this section demonstrate simple plugin tasks including:

Open the database and create a table

Call the openDatabase() function to get started, passing in the name and location for the database.

var db = window.sqlitePlugin.openDatabase({ name: 'my.db', location: 'default' }, function (db) {

    // Here, you might create or open the table.

}, function (error) {
    console.log('Open database ERROR: ' + JSON.stringify(error));
});

Create a table with three columns for first name, last name, and a customer account number. If the table already exists, this SQL statement opens the table.

db.transaction(function (tx) {
    // ...
    tx.executeSql('CREATE TABLE customerAccounts (firstname, lastname, acctNo)');
}, function (error) {
    console.log('transaction error: ' + error.message);
}, function () {
    console.log('transaction ok');
});

By wrapping the previous executeSql() function call in db.transaction(), we will make these tasks asynchronous. If you want to, you can use multiple executeSql() statements within a single transaction (not shown).

Add a row to the database

Add a row to the database using the INSERT INTO SQL statement.

function addItem(first, last, acctNum) {

    db.transaction(function (tx) {

        var query = "INSERT INTO customerAccounts (firstname, lastname, acctNo) VALUES (?,?,?)";

        tx.executeSql(query, [first, last, acctNum], function(tx, res) {
            console.log("insertId: " + res.insertId + " -- probably 1");
            console.log("rowsAffected: " + res.rowsAffected + " -- should be 1");
        },
        function(tx, error) {
            console.log('INSERT error: ' + error.message);
        });
    }, function(error) {
        console.log('transaction error: ' + error.message);
    }, function() {
        console.log('transaction ok');
    });
}

To add some actual rows in your app, call the addItem function several times.

addItem("Fred", "Smith", 100);
addItem("Bob", "Yerunkle", 101);
addItem("Joe", "Auzomme", 102);
addItem("Pete", "Smith", 103);

Read data from the database

Add code to read from the database using a SELECT statement. Include a WHERE condition to match the resultSet to the passed in last name.

function getData(last) {

    db.transaction(function (tx) {

        var query = "SELECT firstname, lastname, acctNo FROM customerAccounts WHERE lastname = ?";

        tx.executeSql(query, [last], function (tx, resultSet) {

            for(var x = 0; x < resultSet.rows.length; x++) {
                console.log("First name: " + resultSet.rows.item(x).firstname +
                    ", Acct: " + resultSet.rows.item(x).acctNo);
            }
        },
        function (tx, error) {
            console.log('SELECT error: ' + error.message);
        });
    }, function (error) {
        console.log('transaction error: ' + error.message);
    }, function () {
        console.log('transaction ok');
    });
}

Remove a row from the database

Add a function to remove a row from the database that matches the passed in customer account number.

function removeItem(acctNum) {

    db.transaction(function (tx) {

        var query = "DELETE FROM customerAccounts WHERE acctNo = ?";

        tx.executeSql(query, [acctNum], function (tx, res) {
            console.log("removeId: " + res.insertId);
            console.log("rowsAffected: " + res.rowsAffected);
        },
        function (tx, error) {
            console.log('DELETE error: ' + error.message);
        });
    }, function (error) {
        console.log('transaction error: ' + error.message);
    }, function () {
        console.log('transaction ok');
    });
}

Update rows in the database

Add a function to update rows in the database for records that match the passed in customer account number. In this form, the statement will update multiple rows if the account numbers are not unique.

function updateItem(first, id) {
    // UPDATE Cars SET Name='Skoda Octavia' WHERE Id=3;
    db.transaction(function (tx) {

        var query = "UPDATE customerAccounts SET firstname = ? WHERE acctNo = ?";

        tx.executeSql(query, [first, id], function(tx, res) {
            console.log("insertId: " + res.insertId);
            console.log("rowsAffected: " + res.rowsAffected);
        },
        function(tx, error) {
            console.log('UPDATE error: ' + error.message);
        });
    }, function(error) {
        console.log('transaction error: ' + error.message);
    }, function() {
        console.log('transaction ok');
    });
}

To call the preceding function, add code like this in your app.

updateItem("Yme", 102);

Close the database

When you are finished with your transactions, close the database. Call closeDB within the transaction success or failure callbacks (rather than the callbacks for executeSql()).

function closeDB() {
    db.close(function () {
        console.log("DB closed!");
    }, function (error) {
        console.log("Error closing DB:" + error.message);
    });
}

Source tree

  • SQLitePlugin.coffee.md: platform-independent (Literate CoffeeScript, can be compiled with a recent CoffeeScript (1.x) compiler)
  • www: platform-independent Javascript as generated from SQLitePlugin.coffee.md using coffeescript@1 (and committed!)
  • src: platform-specific source code
  • node_modules: placeholder for external dependencies
  • scripts: installation hook script to fetch the external dependencies via npm
  • spec: test suite using Jasmine (2.4.1)
  • tests: very simple Jasmine test suite that is run on Circle CI (Android platform) and Travis CI (iOS platform) (used as a placeholder)

Contributing

Community

  • Testimonials of apps that are using this plugin would be especially helpful.
  • Reporting issues can help improve the quality of this plugin.

NOTE: As stated above, patches will NOT be accepted on this project due to some possible licensing issues. Issues with reproduction scenarios will help maintain and improve the quality of this plugin for future users. (Any pointers to the code may be causing the issue would also be helpful.)

Contact

sales@litehelpers.net

About

Cordova sqlite plugin with Android performance enhancements, GPL or commercial license options, with LEGACY SUPPORT for Windows 8.1 / Windows Phone 8.1 on VS 2015

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