[GitHub/WoltLab/WCF.git] / wcfsetup / install / files / lib / system / database / editor / MySQLDatabaseEditor.class.php

<?php
namespace wcf\system\database\editor;
use wcf\system\database\util\PreparedStatementConditionBuilder;
use wcf\system\Regex;

/**
 * Database editor implementation for MySQL4.1 or higher.
 * 
 * @author	Marcel Werk
 * @copyright	2001-2012 WoltLab GmbH
 * @license	GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
 * @package	com.woltlab.wcf
 * @subpackage	system.database.editor
 * @category	Community Framework
 */
class MySQLDatabaseEditor extends DatabaseEditor {
	/**
	 * @see	wcf\system\database\editor\DatabaseEditor::getTableNames()
	 */
	public function getTableNames() {
		$existingTables = array();
		$sql = "SHOW TABLES FROM `".$this->dbObj->getDatabaseName()."`";
		$statement = $this->dbObj->prepareStatement($sql);
		$statement->execute();
		while ($row = $statement->fetchArray(\PDO::FETCH_NUM)) {
			$existingTables[] = $row[0];
		}
		return $existingTables;
	}
	
	/**
	 * @see	wcf\system\database\editor\DatabaseEditor::getColumns()
	 */
	public function getColumns($tableName) {
		$columns = array();
		$sql = "SHOW COLUMNS FROM ".$tableName;
		$statement = $this->dbObj->prepareStatement($sql);
		$statement->execute();
		while ($row = $statement->fetchArray()) {
			$typeMatches = Regex::compile('([a-z]+)\(([0-9]+)\)', Regex::CASE_INSENSITIVE)->match($row['Type']);

      	 	$columns[] = array('name' => $row['Field'], 
								'data' => array(
											'type' => $typeMatches[1], 
											'length' => $typeMatches[2],
											'notNull' => (($row['Null'] == 'YES') ? true : false), 
											'key' => (($row['Key'] == 'PRI') ? 'PRIMARY' : (($row['Key'] == 'UNI') ? 'UNIQUE' : '')),
											'default' => $row['Default'], 
											'autoIncrement' => ($row['Extra'] == 'auto_increment' ? true : false)
										)
							);
   		}
		
		return $columns;
	}
	
	/**
	 * @see	wcf\system\database\editor\DatabaseEditor::getIndices()
	 */
	public function getIndices($tableName) {
		$indices = array();
		$sql = "SHOW INDEX FROM ".$tableName;
		$statement = $this->dbObj->prepareStatement($sql);
		$statement->execute();
		while ($row = $statement->fetchArray()) {
			$indices[] = $row['Key_name'];
		}
		
		return $indices;
	}
	
	/**
	 * @see	wcf\system\database\editor\DatabaseEditor::createTable()
	 */
	public function createTable($tableName, $columns, $indices = array()) {
		$columnDefinition = $indexDefinition = '';
		
		// build column definition
		foreach ($columns as $column) {
			if (!empty($columnDefinition)) $columnDefinition .= ',';
			$columnDefinition .= $this->buildColumnDefinition($column['name'], $column['data']);
		}
		
		// build index definition
		$hasFulltextIndex = false;
		foreach ($indices as $index) {
			if (!empty($indexDefinition)) $indexDefinition .= ',';
			$indexDefinition .= $this->buildIndexDefinition($index['name'], $index['data']);
			if ($index['data']['type'] == 'FULLTEXT') $hasFulltextIndex = true;
		}
		
		// create table
		$sql = "CREATE TABLE ".$tableName." (
				".$columnDefinition."
				".(!empty($indexDefinition) ? ',' : '')."
				".$indexDefinition."
			) ENGINE=".($hasFulltextIndex ? 'MyISAM' : 'InnoDB')." DEFAULT CHARSET=utf8";
		$statement = $this->dbObj->prepareStatement($sql);
		$statement->execute();
	}
	
	/**
	 * @see	wcf\system\database\editor\DatabaseEditor::dropTable()
	 */
	public function dropTable($tableName) {
		$sql = "DROP TABLE IF EXISTS ".$tableName;
		$statement = $this->dbObj->prepareStatement($sql);
		$statement->execute();
	}
	
	/**
	 * @see	wcf\system\database\editor\DatabaseEditor::addColumn()
	 */
	public function addColumn($tableName, $columnName, $columnData) {
		$sql = "ALTER TABLE ".$tableName." ADD COLUMN ".$this->buildColumnDefinition($columnName, $columnData);
		$statement = $this->dbObj->prepareStatement($sql);
		$statement->execute();
	}
	
	/**
	 * @see	wcf\system\database\editor\DatabaseEditor::alterColumn()
	 */
	public function alterColumn($tableName, $oldColumnName, $newColumnName, $newColumnData) {
		$sql = "ALTER TABLE ".$tableName." CHANGE COLUMN ".$oldColumnName." ".$this->buildColumnDefinition($newColumnName, $newColumnData);
		$statement = $this->dbObj->prepareStatement($sql);
		$statement->execute();
	}
	
	/**
	 * @see	wcf\system\database\editor\DatabaseEditor::dropColumn()
	 */
	public function dropColumn($tableName, $columnName) {
		$sql = "ALTER TABLE ".$tableName." DROP COLUMN ".$columnName;
		$statement = $this->dbObj->prepareStatement($sql);
		$statement->execute();
	}
	
	/**
	 * @see	wcf\system\database\editor\DatabaseEditor::addIndex()
	 */
	public function addIndex($tableName, $indexName, $indexData) {
		$sql = "ALTER TABLE ".$tableName." ADD ".$this->buildIndexDefinition($indexName, $indexData);
		$statement = $this->dbObj->prepareStatement($sql);
		$statement->execute();
	}
	
	/**
	 * @see	wcf\system\database\editor\DatabaseEditor::addIndex()
	 */
	public function addForeignKey($tableName, $indexName, $indexData) {
		$sql = "ALTER TABLE ".$tableName." ADD";
		
		// add index name
		if (!empty($indexName)) $sql .= " CONSTRAINT `".$indexName."`";
		
		// add columns
		$sql .= " FOREIGN KEY (".str_replace(',', ',', preg_replace('/\s+/', '', $indexData['columns'])).")";
		
		// add referenced table name
		$sql .= " REFERENCES ".$indexData['referencedTable'];
		
		// add referenced columns
		$sql .= " (".str_replace(',', ',', preg_replace('/\s+/', '', $indexData['referencedColumns'])).")";
		
		// add operation and action
		if (!empty($indexData['operation'])) $sql .= " ON ".$indexData['operation']." ".$indexData['action'];
		
		$statement = $this->dbObj->prepareStatement($sql);
		$statement->execute();
	}
	
	/**
	 * @see	wcf\system\database\editor\DatabaseEditor::dropIndex()
	 */
	public function dropIndex($tableName, $indexName) {
		$sql = "ALTER TABLE ".$tableName." DROP INDEX ".$indexName;
		$statement = $this->dbObj->prepareStatement($sql);
		$statement->execute();
	}
	
	/**
	 * @see	wcf\system\database\editor\DatabaseEditor::dropForeignKey()
	 */
	public function dropForeignKey($tableName, $indexName) {
		$sql = "ALTER TABLE ".$tableName." DROP FOREIGN KEY `".$indexName."`";
		$statement = $this->dbObj->prepareStatement($sql);
		$statement->execute();
	}
	
	/**
	 * Builds a column definition for execution in a create table or alter table statement.
	 * 
	 * @param	string		$columnName
	 * @param	array		$columnData
	 * @param	string
	 */
	protected function buildColumnDefinition($columnName, $columnData) {
		// column name
		$definition = $columnName;
		// column type
		$definition .= " ".$columnData['type'];
		// column length and decimals
		if (!empty($columnData['length'])) {
			$definition .= "(".$columnData['length'].(!empty($columnData['decimals']) ? ",".$columnData['decimals'] : "").")";
		}
		// enum / set
		if ($columnData['type'] == 'enum' && !empty($columnData['values'])) {
			$definition .= "(".$columnData['values'].")";
		}
		// not null / null
		if (!empty($columnData['notNull'])) $definition .= " NOT NULL";
		// default
		if (isset($columnData['default']) && $columnData['default'] !== '') $definition .= " DEFAULT ".$columnData['default'];
		// auto_increment
		if (!empty($columnData['autoIncrement'])) $definition .= " AUTO_INCREMENT";
		// key
		if (!empty($columnData['key'])) $definition .= " ".$columnData['key']." KEY";
		
		return $definition;
	}
	
	/**
	 * Builds a index definition for execution in a create table or alter table statement.
	 * 
	 * @param	string		$indexName
	 * @param	array		$indexData
	 * @param	string
	 */
	protected function buildIndexDefinition($indexName, $indexData) {
		$definition = "";
		// index type
		if ($indexData['type'] == 'PRIMARY') $definition = "PRIMARY KEY";
		else if ($indexData['type'] == 'UNIQUE') $definition = "UNIQUE KEY";
		else if ($indexData['type'] == 'FULLTEXT') $definition = "FULLTEXT KEY";
		else $definition = "KEY";
		
		// index name
		if (!empty($indexName)) $definition .= " ".$indexName."";
		// columns
		$definition .= " (".str_replace(',', ',', preg_replace('/\s+/', '', $indexData['columns'])).")";
		
		return $definition;
	}
	
	/**
	 * @see	wcf\system\database\editor\DatabaseEditor::dropConflictedTables()
	 */
	public function dropConflictedTables(array $conflictedTables) {
		$tables = array();
		foreach ($conflictedTables as $tableName) {
			$tables[$tableName] = array();
		}
		
		// get current database
		$sql = "SELECT	DATABASE() AS currentDB";
		$statement = $this->dbObj->prepareStatement($sql);
		$statement->execute();
		$row = $statement->fetchArray();
		$currentDB = $row['currentDB'];
		
		// get constraints
		$conditions = new PreparedStatementConditionBuilder();
		$conditions->add("TABLE_SCHEMA = ?", array($currentDB));
		$conditions->add("TABLE_NAME IN (?)", array($conflictedTables));
		$conditions->add("REFERENCED_TABLE_NAME IS NOT NULL");
		$conditions->add("CONSTRAINT_NAME LIKE ?", array('%_fk'));
		
		$sql = "SELECT	CONSTRAINT_NAME, TABLE_NAME
			FROM	information_schema.KEY_COLUMN_USAGE
			".$conditions;
		$statement = $this->dbObj->prepareStatement($sql);
		$statement->execute($conditions->getParameters());
		while ($row = $statement->fetchArray()) {
			$this->tables[$row['TABLE_NAME']][] = $row['CONSTRAINT_NAME'];
		}
		
		// handle foreign keys from 3rd party tables
		$conditions = new PreparedStatementConditionBuilder();
		$conditions->add("TABLE_SCHEMA = ?", array($currentDB));
		$conditions->add("REFERENCED_TABLE_NAME IN (?)", array($conflictedTables));
		$conditions->add("CONSTRAINT_NAME LIKE ?", array('%_fk'));
		
		$sql = "SELECT	CONSTRAINT_NAME, TABLE_NAME
			FROM	information_schema.KEY_COLUMN_USAGE
			".$conditions;
		$statement = $this->dbObj->prepareStatement($sql);
		$statement->execute($conditions->getParameters());
		$foreignConstraints = array();
		while ($row = $statement->fetchArray()) {
			if (!isset($foreignConstraints[$row['TABLE_NAME']])) {
				$foreignConstraints[$row['TABLE_NAME']] = array();
			}
			
			$foreignConstraints[$row['TABLE_NAME']][] = $row['CONSTRAINT_NAME'];
		}
		
		// drop foreign keys from 3rd party tables
		foreach ($foreignConstraints as $tableName => $foreignKeys) {
			foreach ($foreignKeys as $fk) {
				$this->dropForeignKey($tableName, $fk);
			}
		}
		
		// drop foreign keys
		foreach ($this->tables as $tableName => $foreignKeys) {
			foreach ($foreignKeys as $fk) {
				$this->dropForeignKey($tableName, $fk);
			}
		}
		
		// drop tables
		foreach (array_keys($this->tables) as $tableName) {
			$this->dropTable($tableName);
		}
	}
}
Commit	Line	Data
11ade432 AE	1	<?php
11ade432 AE	2	namespace wcf\system\database\editor;
76d74665	3	use wcf\system\database\util\PreparedStatementConditionBuilder;
82a7de7f	4	use wcf\system\Regex;
11ade432 AE	5
11ade432 AE	6	/**
a17de04e MS	7	* Database editor implementation for MySQL4.1 or higher.
a17de04e MS	8	*
11ade432	9	* @author Marcel Werk
9f959ced	10	* @copyright 2001-2012 WoltLab GmbH
11ade432 AE	11	* @license GNU Lesser General Public License <http://opensource.org/licenses/lgpl-license.php>
	12	* @package com.woltlab.wcf
	13	* @subpackage system.database.editor
9f959ced	14	* @category Community Framework
11ade432 AE	15	*/
	16	class MySQLDatabaseEditor extends DatabaseEditor {
	17	/**
9f959ced	18	* @see wcf\system\database\editor\DatabaseEditor::getTableNames()
11ade432 AE	19	*/
	20	public function getTableNames() {
	21	$existingTables = array();
	22	$sql = "SHOW TABLES FROM `".$this->dbObj->getDatabaseName()."`";
	23	$statement = $this->dbObj->prepareStatement($sql);
	24	$statement->execute();
	25	while ($row = $statement->fetchArray(\PDO::FETCH_NUM)) {
	26	$existingTables[] = $row[0];
	27	}
	28	return $existingTables;
	29	}
	30
	31	/**
9f959ced	32	* @see wcf\system\database\editor\DatabaseEditor::getColumns()
11ade432 AE	33	*/
	34	public function getColumns($tableName) {
	35	$columns = array();
	36	$sql = "SHOW COLUMNS FROM ".$tableName;
	37	$statement = $this->dbObj->prepareStatement($sql);
	38	$statement->execute();
	39	while ($row = $statement->fetchArray()) {
4d4a5125 K	40	$typeMatches = Regex::compile('([a-z]+)\(([0-9]+)\)', Regex::CASE_INSENSITIVE)->match($row['Type']);
	41
	42	$columns[] = array('name' => $row['Field'],
	43	'data' => array(
	44	'type' => $typeMatches[1],
	45	'length' => $typeMatches[2],
	46	'notNull' => (($row['Null'] == 'YES') ? true : false),
	47	'key' => (($row['Key'] == 'PRI') ? 'PRIMARY' : (($row['Key'] == 'UNI') ? 'UNIQUE' : '')),
	48	'default' => $row['Default'],
	49	'autoIncrement' => ($row['Extra'] == 'auto_increment' ? true : false)
	50	)
	51	);
82a7de7f	52	}
bf27dc91	53
9f959ced	54	return $columns;
11ade432 AE	55	}
	56
	57	/**
9f959ced	58	* @see wcf\system\database\editor\DatabaseEditor::getIndices()
11ade432 AE	59	*/
	60	public function getIndices($tableName) {
	61	$indices = array();
	62	$sql = "SHOW INDEX FROM ".$tableName;
	63	$statement = $this->dbObj->prepareStatement($sql);
	64	$statement->execute();
	65	while ($row = $statement->fetchArray()) {
9f959ced MS	66	$indices[] = $row['Key_name'];
	67	}
	68
	69	return $indices;
11ade432 AE	70	}
	71
	72	/**
9f959ced	73	* @see wcf\system\database\editor\DatabaseEditor::createTable()
11ade432 AE	74	*/
	75	public function createTable($tableName, $columns, $indices = array()) {
	76	$columnDefinition = $indexDefinition = '';
	77
	78	// build column definition
	79	foreach ($columns as $column) {
	80	if (!empty($columnDefinition)) $columnDefinition .= ',';
	81	$columnDefinition .= $this->buildColumnDefinition($column['name'], $column['data']);
	82	}
	83
	84	// build index definition
	85	$hasFulltextIndex = false;
	86	foreach ($indices as $index) {
	87	if (!empty($indexDefinition)) $indexDefinition .= ',';
	88	$indexDefinition .= $this->buildIndexDefinition($index['name'], $index['data']);
	89	if ($index['data']['type'] == 'FULLTEXT') $hasFulltextIndex = true;
	90	}
	91
	92	// create table
	93	$sql = "CREATE TABLE ".$tableName." (
	94	".$columnDefinition."
	95	".(!empty($indexDefinition) ? ',' : '')."
	96	".$indexDefinition."
	97	) ENGINE=".($hasFulltextIndex ? 'MyISAM' : 'InnoDB')." DEFAULT CHARSET=utf8";
	98	$statement = $this->dbObj->prepareStatement($sql);
	99	$statement->execute();
	100	}
	101
	102	/**
9f959ced	103	* @see wcf\system\database\editor\DatabaseEditor::dropTable()
11ade432 AE	104	*/
	105	public function dropTable($tableName) {
	106	$sql = "DROP TABLE IF EXISTS ".$tableName;
	107	$statement = $this->dbObj->prepareStatement($sql);
	108	$statement->execute();
	109	}
	110
	111	/**
9f959ced	112	* @see wcf\system\database\editor\DatabaseEditor::addColumn()
11ade432 AE	113	*/
	114	public function addColumn($tableName, $columnName, $columnData) {
	115	$sql = "ALTER TABLE ".$tableName." ADD COLUMN ".$this->buildColumnDefinition($columnName, $columnData);
	116	$statement = $this->dbObj->prepareStatement($sql);
	117	$statement->execute();
	118	}
	119
	120	/**
9f959ced	121	* @see wcf\system\database\editor\DatabaseEditor::alterColumn()
11ade432 AE	122	*/
	123	public function alterColumn($tableName, $oldColumnName, $newColumnName, $newColumnData) {
	124	$sql = "ALTER TABLE ".$tableName." CHANGE COLUMN ".$oldColumnName." ".$this->buildColumnDefinition($newColumnName, $newColumnData);
	125	$statement = $this->dbObj->prepareStatement($sql);
	126	$statement->execute();
	127	}
	128
	129	/**
9f959ced	130	* @see wcf\system\database\editor\DatabaseEditor::dropColumn()
11ade432 AE	131	*/
	132	public function dropColumn($tableName, $columnName) {
	133	$sql = "ALTER TABLE ".$tableName." DROP COLUMN ".$columnName;
	134	$statement = $this->dbObj->prepareStatement($sql);
	135	$statement->execute();
	136	}
	137
	138	/**
9f959ced	139	* @see wcf\system\database\editor\DatabaseEditor::addIndex()
11ade432 AE	140	*/
	141	public function addIndex($tableName, $indexName, $indexData) {
	142	$sql = "ALTER TABLE ".$tableName." ADD ".$this->buildIndexDefinition($indexName, $indexData);
	143	$statement = $this->dbObj->prepareStatement($sql);
	144	$statement->execute();
	145	}
	146
	147	/**
9f959ced	148	* @see wcf\system\database\editor\DatabaseEditor::addIndex()
11ade432 AE	149	*/
	150	public function addForeignKey($tableName, $indexName, $indexData) {
	151	$sql = "ALTER TABLE ".$tableName." ADD";
	152
	153	// add index name
96017679	154	if (!empty($indexName)) $sql .= " CONSTRAINT `".$indexName."`";
11ade432 AE	155
	156	// add columns
	157	$sql .= " FOREIGN KEY (".str_replace(',', ',', preg_replace('/\s+/', '', $indexData['columns'])).")";
	158
	159	// add referenced table name
	160	$sql .= " REFERENCES ".$indexData['referencedTable'];
	161
	162	// add referenced columns
	163	$sql .= " (".str_replace(',', ',', preg_replace('/\s+/', '', $indexData['referencedColumns'])).")";
	164
	165	// add operation and action
	166	if (!empty($indexData['operation'])) $sql .= " ON ".$indexData['operation']." ".$indexData['action'];
	167
	168	$statement = $this->dbObj->prepareStatement($sql);
	169	$statement->execute();
	170	}
	171
	172	/**
9f959ced	173	* @see wcf\system\database\editor\DatabaseEditor::dropIndex()
11ade432 AE	174	*/
	175	public function dropIndex($tableName, $indexName) {
	176	$sql = "ALTER TABLE ".$tableName." DROP INDEX ".$indexName;
	177	$statement = $this->dbObj->prepareStatement($sql);
	178	$statement->execute();
	179	}
	180
b6ae7d04	181	/**
9f959ced	182	* @see wcf\system\database\editor\DatabaseEditor::dropForeignKey()
b6ae7d04 MW	183	*/
b6ae7d04 MW	184	public function dropForeignKey($tableName, $indexName) {
96017679	185	$sql = "ALTER TABLE ".$tableName." DROP FOREIGN KEY `".$indexName."`";
b6ae7d04 MW	186	$statement = $this->dbObj->prepareStatement($sql);
	187	$statement->execute();
	188	}
	189
11ade432 AE	190	/**
	191	* Builds a column definition for execution in a create table or alter table statement.
	192	*
	193	* @param string $columnName
	194	* @param array $columnData
	195	* @param string
	196	*/
	197	protected function buildColumnDefinition($columnName, $columnData) {
	198	// column name
	199	$definition = $columnName;
	200	// column type
	201	$definition .= " ".$columnData['type'];
	202	// column length and decimals
	203	if (!empty($columnData['length'])) {
	204	$definition .= "(".$columnData['length'].(!empty($columnData['decimals']) ? ",".$columnData['decimals'] : "").")";
	205	}
	206	// enum / set
	207	if ($columnData['type'] == 'enum' && !empty($columnData['values'])) {
	208	$definition .= "(".$columnData['values'].")";
	209	}
	210	// not null / null
	211	if (!empty($columnData['notNull'])) $definition .= " NOT NULL";
	212	// default
	213	if (isset($columnData['default']) && $columnData['default'] !== '') $definition .= " DEFAULT ".$columnData['default'];
	214	// auto_increment
	215	if (!empty($columnData['autoIncrement'])) $definition .= " AUTO_INCREMENT";
	216	// key
	217	if (!empty($columnData['key'])) $definition .= " ".$columnData['key']." KEY";
	218
	219	return $definition;
	220	}
	221
	222	/**
	223	* Builds a index definition for execution in a create table or alter table statement.
	224	*
	225	* @param string $indexName
	226	* @param array $indexData
	227	* @param string
	228	*/
	229	protected function buildIndexDefinition($indexName, $indexData) {
	230	$definition = "";
	231	// index type
	232	if ($indexData['type'] == 'PRIMARY') $definition = "PRIMARY KEY";
	233	else if ($indexData['type'] == 'UNIQUE') $definition = "UNIQUE KEY";
	234	else if ($indexData['type'] == 'FULLTEXT') $definition = "FULLTEXT KEY";
	235	else $definition = "KEY";
	236
	237	// index name
	238	if (!empty($indexName)) $definition .= " ".$indexName."";
	239	// columns
	240	$definition .= " (".str_replace(',', ',', preg_replace('/\s+/', '', $indexData['columns'])).")";
	241
	242	return $definition;
	243	}
76d74665 AE	244
	245	/**
	246	* @see wcf\system\database\editor\DatabaseEditor::dropConflictedTables()
	247	*/
	248	public function dropConflictedTables(array $conflictedTables) {
	249	$tables = array();
	250	foreach ($conflictedTables as $tableName) {
	251	$tables[$tableName] = array();
	252	}
	253
	254	// get current database
	255	$sql = "SELECT DATABASE() AS currentDB";
	256	$statement = $this->dbObj->prepareStatement($sql);
	257	$statement->execute();
	258	$row = $statement->fetchArray();
	259	$currentDB = $row['currentDB'];
	260
	261	// get constraints
	262	$conditions = new PreparedStatementConditionBuilder();
	263	$conditions->add("TABLE_SCHEMA = ?", array($currentDB));
	264	$conditions->add("TABLE_NAME IN (?)", array($conflictedTables));
	265	$conditions->add("REFERENCED_TABLE_NAME IS NOT NULL");
	266	$conditions->add("CONSTRAINT_NAME LIKE ?", array('%_fk'));
	267
	268	$sql = "SELECT CONSTRAINT_NAME, TABLE_NAME
	269	FROM information_schema.KEY_COLUMN_USAGE
	270	".$conditions;
	271	$statement = $this->dbObj->prepareStatement($sql);
	272	$statement->execute($conditions->getParameters());
	273	while ($row = $statement->fetchArray()) {
	274	$this->tables[$row['TABLE_NAME']][] = $row['CONSTRAINT_NAME'];
	275	}
	276
a1517977 AE	277	// handle foreign keys from 3rd party tables
	278	$conditions = new PreparedStatementConditionBuilder();
	279	$conditions->add("TABLE_SCHEMA = ?", array($currentDB));
	280	$conditions->add("REFERENCED_TABLE_NAME IN (?)", array($conflictedTables));
	281	$conditions->add("CONSTRAINT_NAME LIKE ?", array('%_fk'));
	282
	283	$sql = "SELECT CONSTRAINT_NAME, TABLE_NAME
	284	FROM information_schema.KEY_COLUMN_USAGE
	285	".$conditions;
	286	$statement = $this->dbObj->prepareStatement($sql);
	287	$statement->execute($conditions->getParameters());
	288	$foreignConstraints = array();
	289	while ($row = $statement->fetchArray()) {
	290	if (!isset($foreignConstraints[$row['TABLE_NAME']])) {
	291	$foreignConstraints[$row['TABLE_NAME']] = array();
	292	}
	293
	294	$foreignConstraints[$row['TABLE_NAME']][] = $row['CONSTRAINT_NAME'];
	295	}
	296
	297	// drop foreign keys from 3rd party tables
	298	foreach ($foreignConstraints as $tableName => $foreignKeys) {
	299	foreach ($foreignKeys as $fk) {
	300	$this->dropForeignKey($tableName, $fk);
	301	}
	302	}
	303
76d74665 AE	304	// drop foreign keys
	305	foreach ($this->tables as $tableName => $foreignKeys) {
	306	foreach ($foreignKeys as $fk) {
	307	$this->dropForeignKey($tableName, $fk);
	308	}
	309	}
	310
	311	// drop tables
	312	foreach (array_keys($this->tables) as $tableName) {
	313	$this->dropTable($tableName);
	314	}
	315	}
11ade432	316	}