Remove hard dependency on PDO

UPGRADE.md

@@ -1,3 +1,48 @@
+# Upgrade to DEVELOP
+
+## BC BREAK: the PDO symbols are no longer part of the DBAL API
+
+1. The support of `PDO::PARAM_*`, `PDO::FETCH_*`, `PDO::CASE_*` and `PDO::PARAM_INPUT_OUTPUT` constants in the DBAL API is removed.
+2. `\Doctrine\DBAL\Driver\PDOStatement` does not extend `\PDOStatement` anymore.
+
+Before:
+
+    use Doctrine\DBAL\Portability\Connection;
+
+    $params = array(
+        'wrapperClass' => Connection::class,
+        'fetch_case' => PDO::CASE_LOWER,
+    );
+
+    $stmt->bindValue(1, 1, PDO::PARAM_INT);
+    $stmt->fetchAll(PDO::FETCH_COLUMN);
+
+After:
+
+    use Doctrine\DBAL\ColumnCase;
+    use Doctrine\DBAL\FetchMode;
+    use Doctrine\DBAL\ParameterType;
+    use Doctrine\DBAL\Portability\Connection;
+
+    $params = array(
+        'wrapperClass' => Connection::class,
+        'fetch_case' => ColumnCase::LOWER,
+    );
+
+    $stmt->bindValue(1, 1, ParameterType::INTEGER);
+    $stmt->fetchAll(FetchMode::COLUMN);
+
+# Upgrade to UNRELEASED
+
+## DEPRECATION: direct usage of the PDO APIs in the DBAL API
+
+1. When calling `Doctrine\DBAL\Driver\Statement` methods, instead of `PDO::PARAM_*` constants, `Doctrine\DBAL\ParameterType` constants should be used.
+2. When calling `Doctrine\DBAL\Driver\ResultStatement` methods, instead of `PDO::FETCH_*` constants, `Doctrine\DBAL\FetchMode` constants should be used.
+3. When configuring `Doctrine\DBAL\Portability\Connection`, instead of `PDO::CASE_*` constants, `Doctrine\DBAL\ColumnCase` constants should be used.
+4. Usage of `PDO::PARAM_INPUT_OUTPUT` in `Doctrine\DBAL\Driver\Statement::bindValue()` is deprecated.
+5. Usage of `PDO::FETCH_FUNC` in `Doctrine\DBAL\Driver\ResultStatement::fetch()` is deprecated.
+6. Calls to `\PDOStatement` methods on a `\Doctrine\DBAL\Driver\PDOStatement` instance (e.g. `fetchObject()`) are deprecated.
+
 # Upgrade to 2.6
 
 ## MINOR BC BREAK: `fetch()` and `fetchAll()` method signatures in `Doctrine\DBAL\Driver\ResultStatement`

composer.json

@@ -13,7 +13,6 @@
     ],
     "require": {
         "php": "^7.2",
-        "ext-pdo": "*",
         "doctrine/common": "^2.7.1"
     },
     "require-dev": {

docs/en/reference/data-retrieval-and-manipulation.rst

@@ -180,13 +180,13 @@ Binding Types
 -------------
 
 Doctrine DBAL extends PDOs handling of binding types in prepared statements
-considerably. Besides the well known ``\PDO::PARAM_*`` constants you
+considerably. Besides ``Doctrine\DBAL\ParameterType`` constants, you
 can make use of two very powerful additional features.
 
 Doctrine\DBAL\Types Conversion
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-If you don't specify an integer (through a ``PDO::PARAM*`` constant) to
+If you don't specify an integer (through one of ``Doctrine\DBAL\ParameterType`` constants) to
 any of the parameter binding methods but a string, Doctrine DBAL will
 ask the type abstraction layer to convert the passed value from
 its PHP to a database representation. This way you can pass ``\DateTime``
@@ -271,7 +271,14 @@ be specified as well:
     // Same SQL WITHOUT usage of Doctrine\DBAL\Connection::PARAM_INT_ARRAY
     $stmt = $conn->executeQuery('SELECT * FROM articles WHERE id IN (?, ?, ?, ?, ?, ?)',
         array(1, 2, 3, 4, 5, 6),
-        array(\PDO::PARAM_INT, \PDO::PARAM_INT, \PDO::PARAM_INT, \PDO::PARAM_INT, \PDO::PARAM_INT, \PDO::PARAM_INT)
+        array(
+            ParameterType::INTEGER,
+            ParameterType::INTEGER,
+            ParameterType::INTEGER,
+            ParameterType::INTEGER,
+            ParameterType::INTEGER,
+            ParameterType::INTEGER,
+        )
     );
 
 This is much more complicated and is ugly to write generically.
@@ -469,8 +476,11 @@ Quote a value:
 .. code-block:: php
 
     <?php
+
+    use Doctrine\DBAL\ParameterType;
+
     $quoted = $conn->quote('value');
-    $quoted = $conn->quote('1234', \PDO::PARAM_INT);
+    $quoted = $conn->quote('1234', ParameterType::INTEGER);
 
 quoteIdentifier()
 ~~~~~~~~~~~~~~~~~

docs/en/reference/known-vendor-issues.rst

@@ -187,6 +187,6 @@ The ``PDO_SQLSRV`` driver currently has a bug when binding values to
 VARBINARY/BLOB columns with ``bindValue`` in prepared statements.
 This raises an implicit conversion from data type error as it tries
 to convert a character type value to a binary type value even if
-you explicitly define the value as ``\PDO::PARAM_LOB`` type.
+you explicitly define the value as ``ParameterType::LARGE_OBJECT`` type.
 Therefore it is highly encouraged to use the native ``sqlsrv``
 driver instead which does not have this limitation.

docs/en/reference/portability.rst

@@ -51,12 +51,16 @@ Using the following code block in your initialization will:
 .. code-block:: php
 
     <?php
+
+    use Doctrine\DBAL\ColumnCase;
+    use Doctrine\DBAL\Portability\Connection as PortableConnection;
+
     $params = array(
         // vendor specific configuration
         //...
-        'wrapperClass' => 'Doctrine\DBAL\Portability\Connection',
-        'portability' => \Doctrine\DBAL\Portability\Connection::PORTABILITY_ALL,
-        'fetch_case' => \PDO::CASE_LOWER,
+        'wrapperClass' => PortableConnection::class,
+        'portability'  => PortableConnection::PORTABILITY_ALL,
+        'fetch_case'   => PortableConnection::LOWER,
     );
 
 This sort of portability handling is pretty expensive because all the result
@@ -80,4 +84,4 @@ This functionality is only implemented with Doctrine 2.1 upwards.
 Doctrine ships with lists of keywords for every supported vendor. You
 can access a keyword list through the schema manager of the vendor you
 are currently using or just instantiating it from the ``Doctrine\DBAL\Platforms\Keywords``
-namespace.
+namespace.

docs/en/reference/security.rst

@@ -151,7 +151,7 @@ the ``Connection#quote`` method:
 
     <?php
     // Parameter quoting
-    $sql = "SELECT * FROM users WHERE name = " . $connection->quote($_GET['username'], \PDO::PARAM_STR);
+    $sql = "SELECT * FROM users WHERE name = " . $connection->quote($_GET['username']);
 
 This method is only available for SQL, not for DQL. For DQL you are always encouraged to use prepared
-statements not only for security, but also for caching reasons.
+statements not only for security, but also for caching reasons.

lib/Doctrine/DBAL/Cache/ArrayStatement.php

@@ -3,7 +3,7 @@
 namespace Doctrine\DBAL\Cache;
 
 use Doctrine\DBAL\Driver\ResultStatement;
-use PDO;
+use Doctrine\DBAL\FetchMode;
 
 class ArrayStatement implements \IteratorAggregate, ResultStatement
 {
@@ -25,7 +25,7 @@ class ArrayStatement implements \IteratorAggregate, ResultStatement
     /**
      * @var integer
      */
-    private $defaultFetchMode = PDO::FETCH_BOTH;
+    private $defaultFetchMode = FetchMode::MIXED;
 
     /**
      * @param array $data
@@ -57,9 +57,9 @@ public function columnCount()
     /**
      * {@inheritdoc}
      */
-    public function setFetchMode($fetchMode, $arg2 = null, $arg3 = null)
+    public function setFetchMode($fetchMode, ...$args)
     {
-        if ($arg2 !== null || $arg3 !== null) {
+        if (count($args) > 0) {
             throw new \InvalidArgumentException("Caching layer does not support 2nd/3rd argument to setFetchMode()");
         }
 
@@ -81,34 +81,41 @@ public function getIterator()
     /**
      * {@inheritdoc}
      */
-    public function fetch($fetchMode = null, $cursorOrientation = \PDO::FETCH_ORI_NEXT, $cursorOffset = 0)
+    public function fetch($fetchMode = null, ...$args)
     {
-        if (isset($this->data[$this->num])) {
-            $row = $this->data[$this->num++];
-            $fetchMode = $fetchMode ?: $this->defaultFetchMode;
-            if ($fetchMode === PDO::FETCH_ASSOC) {
-                return $row;
-            } elseif ($fetchMode === PDO::FETCH_NUM) {
-                return array_values($row);
-            } elseif ($fetchMode === PDO::FETCH_BOTH) {
-                return array_merge($row, array_values($row));
-            } elseif ($fetchMode === PDO::FETCH_COLUMN) {
-                return reset($row);
-            } else {
-                throw new \InvalidArgumentException("Invalid fetch-style given for fetching result.");
-            }
+        if ( ! isset($this->data[$this->num])) {
+            return false;
+        }
+
+        $row       = $this->data[$this->num++];
+        $fetchMode = $fetchMode ?: $this->defaultFetchMode;
+
+        if ($fetchMode === FetchMode::ASSOCIATIVE) {
+            return $row;
+        }
+
+        if ($fetchMode === FetchMode::NUMERIC) {
+            return array_values($row);
         }
 
-        return false;
+        if ($fetchMode === FetchMode::MIXED) {
+            return array_merge($row, array_values($row));
+        }
+
+        if ($fetchMode === FetchMode::COLUMN) {
+            return reset($row);
+        }
+
+        throw new \InvalidArgumentException("Invalid fetch-style given for fetching result.");
     }
 
     /**
      * {@inheritdoc}
      */
-    public function fetchAll($fetchMode = null, $fetchArgument = null, $ctorArgs = null)
+    public function fetchAll($fetchMode = null, ...$args)
     {
         $rows = [];
-        while ($row = $this->fetch($fetchMode)) {
+        while ($row = $this->fetch($fetchMode, ...$args)) {
             $rows[] = $row;
         }
 
@@ -120,7 +127,8 @@ public function fetchAll($fetchMode = null, $fetchArgument = null, $ctorArgs = n
      */
     public function fetchColumn($columnIndex = 0)
     {
-        $row = $this->fetch(PDO::FETCH_NUM);
+        $row = $this->fetch(FetchMode::NUMERIC);
+
         if (!isset($row[$columnIndex])) {
             // TODO: verify this is correct behavior
             return false;

lib/Doctrine/DBAL/Cache/ResultCacheStatement.php

@@ -5,7 +5,7 @@
 use Doctrine\DBAL\Driver\Statement;
 use Doctrine\DBAL\Driver\ResultStatement;
 use Doctrine\Common\Cache\Cache;
-use PDO;
+use Doctrine\DBAL\FetchMode;
 
 /**
  * Cache statement for SQL results.
@@ -63,7 +63,7 @@ class ResultCacheStatement implements \IteratorAggregate, ResultStatement
     /**
      * @var integer
      */
-    private $defaultFetchMode = PDO::FETCH_BOTH;
+    private $defaultFetchMode = FetchMode::MIXED;
 
     /**
      * @param \Doctrine\DBAL\Driver\Statement $stmt
@@ -110,7 +110,7 @@ public function columnCount()
     /**
      * {@inheritdoc}
      */
-    public function setFetchMode($fetchMode, $arg2 = null, $arg3 = null)
+    public function setFetchMode($fetchMode, ...$args)
     {
         $this->defaultFetchMode = $fetchMode;
 
@@ -130,30 +130,38 @@ public function getIterator()
     /**
      * {@inheritdoc}
      */
-    public function fetch($fetchMode = null, $cursorOrientation = \PDO::FETCH_ORI_NEXT, $cursorOffset = 0)
+    public function fetch($fetchMode = null, ...$args)
     {
         if ($this->data === null) {
             $this->data = [];
         }
 
-        $row = $this->statement->fetch(PDO::FETCH_ASSOC);
+        $row = $this->statement->fetch(FetchMode::ASSOCIATIVE);
+
         if ($row) {
             $this->data[] = $row;
 
             $fetchMode = $fetchMode ?: $this->defaultFetchMode;
 
-            if ($fetchMode == PDO::FETCH_ASSOC) {
+            if ($fetchMode == FetchMode::ASSOCIATIVE) {
                 return $row;
-            } elseif ($fetchMode == PDO::FETCH_NUM) {
+            }
+
+            if ($fetchMode == FetchMode::NUMERIC) {
                 return array_values($row);
-            } elseif ($fetchMode == PDO::FETCH_BOTH) {
+            }
+
+            if ($fetchMode == FetchMode::MIXED) {
                 return array_merge($row, array_values($row));
-            } elseif ($fetchMode == PDO::FETCH_COLUMN) {
+            }
+
+            if ($fetchMode == FetchMode::COLUMN) {
                 return reset($row);
-            } else {
-                throw new \InvalidArgumentException("Invalid fetch-style given for caching result.");
             }
+
+            throw new \InvalidArgumentException('Invalid fetch-style given for caching result.');
         }
+
         $this->emptied = true;
 
         return false;
@@ -162,10 +170,10 @@ public function fetch($fetchMode = null, $cursorOrientation = \PDO::FETCH_ORI_NE
     /**
      * {@inheritdoc}
      */
-    public function fetchAll($fetchMode = null, $fetchArgument = null, $ctorArgs = null)
+    public function fetchAll($fetchMode = null, ...$args)
     {
         $rows = [];
-        while ($row = $this->fetch($fetchMode)) {
+        while ($row = $this->fetch($fetchMode, ...$args)) {
             $rows[] = $row;
         }
 
@@ -177,7 +185,8 @@ public function fetchAll($fetchMode = null, $fetchArgument = null, $ctorArgs = n
      */
     public function fetchColumn($columnIndex = 0)
     {
-        $row = $this->fetch(PDO::FETCH_NUM);
+        $row = $this->fetch(FetchMode::NUMERIC);
+
         if (!isset($row[$columnIndex])) {
             // TODO: verify this is correct behavior
             return false;

lib/Doctrine/DBAL/ColumnCase.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace Doctrine\DBAL;
+
+/**
+ * Contains portable column case conversions.
+ */
+class ColumnCase
+{
+    /**
+     * Convert column names to upper case.
+     *
+     * @see \PDO::CASE_UPPER
+     */
+    public const UPPER = 1;
+
+    /**
+     * Convert column names to lower case.
+     *
+     * @see \PDO::CASE_LOWER
+     */
+    public const LOWER = 2;
+
+    /**
+     * This class cannot be instantiated.
+     */
+    final private function __construct()
+    {
+    }
+}