[tools] Script to remove Zero dates for mysql 5.7 (#2444)

* Added script for 00:00:00 dates

* bad path

* Changed author

* reset foreign key check to original value

* Reorganize output

* More details in query

* Replace type by original type

* fixed catch 22

* typo

* handle non-nullable fields

tools/DB_date_zeros_removal.php

@@ -0,0 +1,102 @@
+<?php
+/**
+ * Script exporting Update statements to remove 0000-00-00 values
+ * and replace them by NULL
+ *
+ * PHP Version 5
+ *
+ * @category Main
+ * @package  Loris
+ * @author   Rida Abou-Haidar <rida.loris@gmail.com>
+ * @license  Loris license
+ * @link     https://www.github.com/aces/Loris-Trunk/
+ */
+set_include_path(get_include_path().":".__DIR__."/../project/libraries:".":".__DIR__."/../../php/libraries:");
+require_once __DIR__ . "/../vendor/autoload.php";
+//require_once "NDB_Config.class.inc";
+
+$client = new NDB_Client();
+$client->makeCommandLine();
+$client->initialize(__DIR__."/../project/config.xml");
+$config = NDB_Config::singleton();
+
+$db =& Database::singleton();
+$database = $config->getSetting('database');
+
+$base = $config->getSetting('base');
+$db->_trackChanges = false;
+
+// Set up variables
+$filename = __DIR__ . "/../project/tables_sql/update_zero_fields_statements.sql";
+$output= "";
+$alters="";
+$updates="";
+
+// Begin Script
+echo "\n#################################################################\n\n".
+    "This Script will generate an UPDATE statement for every date field ".
+    "currently in the database. \nThe output file is ".
+    "tables_sql/update_zero_fields_statements.sql and includes foreign key ".
+    "checks disabling and re-enabling.\n".
+    "\n#################################################################\n\n";
+
+$database_name= $database['database'];
+
+$field_names = $db->pselect("
+                      SELECT TABLE_NAME,COLUMN_NAME,COLUMN_DEFAULT,DATA_TYPE,IS_NULLABLE,COLUMN_TYPE 
+                      FROM INFORMATION_SCHEMA.COLUMNS 
+                      WHERE DATA_TYPE IN ('date','timestamp','datetime') 
+                          AND TABLE_SCHEMA=:dbn",
+    array("dbn"=>$database['database'])
+);
+
+
+// BEGIN building script
+
+//save old variables
+$output .="SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS; \n";
+$output .="SET @OLD_sql_mode=@@sql_mode; \n";
+
+//disable obstacles
+$output .="SET FOREIGN_KEY_CHECKS=0; \n";
+$output .="SET sql_mode = ''; \n";
+
+foreach ($field_names as $key=>$field)
+{
+    if ($field['COLUMN_DEFAULT']=='0000-00-00') {
+        echo "The script will modify the date schema for TABLE: `".$field['TABLE_NAME']."` FIELD: `".$field['COLUMN_NAME']."` to default to NULL\n";
+        $alters .= "ALTER TABLE `".$field['TABLE_NAME']."` MODIFY `".$field['COLUMN_NAME']."` ".$field['COLUMN_TYPE']." DEFAULT NULL;\n";
+    } else if ($field['COLUMN_DEFAULT']=='0000-00-00 00:00:00') {
+        echo "The script will modify the date schema for TABLE: `".$field['TABLE_NAME']."` FIELD: `".$field['COLUMN_NAME']."` to default to NULL\n";
+        $alters .= "ALTER TABLE `".$field['TABLE_NAME']."` MODIFY `".$field['COLUMN_NAME']."` ".$field['COLUMN_TYPE']." DEFAULT NULL;\n";
+    }
+
+
+    if ($field['DATA_TYPE'] == 'date' && $field['IS_NULLABLE']=='YES') {
+        $updates .= "UPDATE ".$database['database'].".".$field['TABLE_NAME'].
+            " SET ".$field['COLUMN_NAME']."=NULL".
+            " WHERE CAST(".$field['COLUMN_NAME']." AS CHAR(20))='0000-00-00';\n";
+    } else if (($field['DATA_TYPE'] == 'datetime' || $field['DATA_TYPE'] == 'timestamp') && $field['IS_NULLABLE']=='YES') {
+        $updates .= "UPDATE ".$database['database'].".".$field['TABLE_NAME'].
+            " SET ".$field['COLUMN_NAME']."=NULL".
+            " WHERE CAST(".$field['COLUMN_NAME']." AS CHAR(20))='0000-00-00 00:00:00';\n";
+    } else {
+	echo "COLUMN ".$field['COLUMN_NAME']." in TABLE ".$field['TABLE_NAME']." is NOT NULLABLE. ".
+	    "A date '1000-01-01' will be entered instead of '0000-00-00' values.\n"; 
+        $nonNullUpdates .= "UPDATE ".$database['database'].".".$field['TABLE_NAME'].
+            " SET ".$field['COLUMN_NAME']."='1000-01-01'".
+            " WHERE CAST(".$field['COLUMN_NAME']." AS CHAR(20))='0000-00-00';\n";
+    }
+
+}
+
+$output .= $alters . $updates . $nonNullUpdates;
+$output .="SET sql_mode = @OLD_sql_mode; \n";
+$output .="SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS; \n";
+// END building script
+
+$fp=fopen($filename, "w");
+fwrite($fp, $output);
+fclose($fp);
+
+?>