Allow migration to unsigned of existing users_* tables

lib/custom/setup/UsersRemoveSignedConstraints.php

@@ -0,0 +1,91 @@
+<?php
+
+/**
+ * @license LGPLv3, http://opensource.org/licenses/LGPL-3.0
+ * @copyright Aimeos (aimeos.org), 2019
+ */
+
+
+namespace Aimeos\MW\Setup\Task;
+
+
+/**
+ * Removes signed constraints from users_* tables before migrating to unsigned
+ */
+class UsersRemoveSignedConstraints extends \Aimeos\MW\Setup\Task\Base
+{
+	/**
+	 * Returns the list of task names which this task depends on.
+	 *
+	 * @return string[] List of task names
+	 */
+	public function getPreDependencies()
+	{
+		return [];
+	}
+
+
+	/**
+	 * Returns the list of task names which depends on this task.
+	 *
+	 * @return array List of task names
+	 */
+	public function getPostDependencies()
+	{
+		return ['TablesCreateMShop'];
+	}
+
+
+	/**
+	 * Executes the task
+	 */
+	public function migrate()
+	{
+		$sql = 'SELECT COLUMN_TYPE FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = \'users\' AND COLUMN_NAME = \'id\'';
+
+		if( $this->getValue( $sql, 'COLUMN_TYPE', 'db-customer' ) === 'int(10)' )
+		{
+			$this->msg( sprintf( 'Remove signed constraints in users related tables' ), 0 );
+			$this->status( '' );
+
+
+			$this->msg( 'Checking constraint in "users_address"', 1 );
+
+			if( $schema->constraintExists( 'users_address', 'fk_lvuad_pid' ) )
+			{
+				$this->execute( 'ALTER TABLE "users_address" DROP FOREIGN KEY "fk_lvuad_pid"', 'db-customer' );
+				$this->status( 'done' );
+			}
+			else
+			{
+				$this->status( 'OK' );
+			}
+
+
+			$this->msg( 'Checking constraint in "users_list"', 1 );
+
+			if( $schema->constraintExists( 'users_list', 'fk_lvuli_pid' ) )
+			{
+				$this->execute( 'ALTER TABLE "users_list" DROP FOREIGN KEY "fk_lvuli_pid"', 'db-customer' );
+				$this->status( 'done' );
+			}
+			else
+			{
+				$this->status( 'OK' );
+			}
+
+
+			$this->msg( 'Checking constraint in "users_property"', 1 );
+
+			if( $schema->constraintExists( 'users_property', 'fk_lvupr_pid' ) )
+			{
+				$this->execute( 'ALTER TABLE "users_property" DROP FOREIGN KEY "fk_lvupr_pid"', 'db-customer' );
+				$this->status( 'done' );
+			}
+			else
+			{
+				$this->status( 'OK' );
+			}
+		}
+	}
+}