githubFork/roundcubemail.git

old mode 100755 new mode 100644

			@@ -1,749 +1,1418 @@
			<?php
			// +----------------------------------------------------------------------+
			// \| PHP versions 4 and 5 \|
			// +----------------------------------------------------------------------+
			// \| Copyright (c) 1998-2004 Manuel Lemos, Tomas V.V.Cox, \|
			// \| Stig. S. Bakken, Lukas Smith \|
			// \| All rights reserved. \|
			// +----------------------------------------------------------------------+
			// \| MDB2 is a merge of PEAR DB and Metabases that provides a unified DB \|
			// \| API as well as database abstraction for PHP applications. \|
			// \| This LICENSE is in the BSD license style. \|
			// \| \|
			// \| Redistribution and use in source and binary forms, with or without \|
			// \| modification, are permitted provided that the following conditions \|
			// \| are met: \|
			// \| \|
			// \| Redistributions of source code must retain the above copyright \|
			// \| notice, this list of conditions and the following disclaimer. \|
			// \| \|
			// \| Redistributions in binary form must reproduce the above copyright \|
			// \| notice, this list of conditions and the following disclaimer in the \|
			// \| documentation and/or other materials provided with the distribution. \|
			// \| \|
			// \| Neither the name of Manuel Lemos, Tomas V.V.Cox, Stig. S. Bakken, \|
			// \| Lukas Smith nor the names of his contributors may be used to endorse \|
			// \| or promote products derived from this software without specific prior\|
			// \| written permission. \|
			// \| \|
			// \| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS \|
			// \| "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT \|
			// \| LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS \|
			// \| FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE \|
			// \| REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, \|
			// \| INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, \|
			// \| BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS\|
			// \| OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED \|
			// \| AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT \|
			// \| LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY\|
			// \| WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE \|
			// \| POSSIBILITY OF SUCH DAMAGE. \|
			// +----------------------------------------------------------------------+
			// \| Author: Lukas Smith <smith@pooteeweet.org> \|
			// +----------------------------------------------------------------------+
			//
			// $Id$
			//

			require_once 'MDB2/Driver/Manager/Common.php';

			/**
			* MDB2 MySQLi driver for the management modules
			*
			* @package MDB2
			* @category Database
			* @author Lukas Smith <smith@pooteeweet.org>
			*/
			class MDB2_Driver_Manager_mysqli extends MDB2_Driver_Manager_Common
			{
			// {{{ properties
			var $verified_table_types = array();#
			// }}}

			// }}}
			// {{{ _verifyTableType()

			/**
			* verify that chosen transactional table hanlder is available in the database
			*
			* @param string $table_type name of the table handler
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access protected
			*/
			function _verifyTableType($table_type)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			switch (strtoupper($table_type)) {
			case 'BERKELEYDB':
			case 'BDB':
			$check = array('have_bdb');
			break;
			case 'INNODB':
			$check = array('have_innobase', 'have_innodb');
			break;
			case 'GEMINI':
			$check = array('have_gemini');
			break;
			case 'HEAP':
			case 'ISAM':
			case 'MERGE':
			case 'MRG_MYISAM':
			case 'MYISAM':
			case '':
			return MDB2_OK;
			default:
			return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
			$table_type.' is not a supported table type');
			}
			if (isset($this->verified_table_types[$table_type])
			&& $this->verified_table_types[$table_type] == $db->connection
			) {
			return MDB2_OK;
			}
			$not_supported = false;
			for ($i = 0, $j = count($check); $i < $j; ++$i) {
			$query = 'SHOW VARIABLES LIKE '.$db->quote($check[$i], 'text');
			$has = $db->queryRow($query, null, MDB2_FETCHMODE_ORDERED);
			if (PEAR::isError($has)) {
			return $has;
			}
			if (is_array($has)) {
			$not_supported = true;
			if ($has[1] == 'YES') {
			$this->verified_table_types[$table_type] = $db->connection;
			return MDB2_OK;
			}
			}
			}
			if ($not_supported) {
			return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
			$table_type.' is not a supported table type by this MySQL database server');
			}
			return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
			'could not tell if '.$table_type.' is a supported table type');
			}

			// }}}
			// {{{ createDatabase()

			/**
			* create a new database
			*
			* @param string $name name of the database that should be created
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function createDatabase($name)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$query = 'CREATE DATABASE '.$name;
			$result = $db->query($query);
			if (PEAR::isError($result)) {
			return $result;
			}
			return MDB2_OK;
			}

			// }}}
			// {{{ dropDatabase()

			/**
			* drop an existing database
			*
			* @param string $name name of the database that should be dropped
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function dropDatabase($name)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$query = 'DROP DATABASE '.$name;
			$result = $db->query($query);
			if (PEAR::isError($result)) {
			return $result;
			}
			return MDB2_OK;
			}

			// }}}
			// {{{ createTable()

			/**
			* create a new table
			*
			* @param string $name Name of the database that should be created
			* @param array $fields Associative array that contains the definition of each field of the new table
			* The indexes of the array entries are the names of the fields of the table an
			* the array entry values are associative arrays like those that are meant to be
			* passed with the field definitions to get[Type]Declaration() functions.
			*
			* Example
			* array(
			*
			* 'id' => array(
			* 'type' => 'integer',
			* 'unsigned' => 1
			* 'notnull' => 1
			* 'default' => 0
			* ),
			* 'name' => array(
			* 'type' => 'text',
			* 'length' => 12
			* ),
			* 'password' => array(
			* 'type' => 'text',
			* 'length' => 12
			* )
			* );
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function createTable($name, $fields)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			if (!$name) {
			return $db->raiseError(MDB2_ERROR_CANNOT_CREATE, null, null,
			'createTable: no valid table name specified');
			}
			if (empty($fields)) {
			return $db->raiseError(MDB2_ERROR_CANNOT_CREATE, null, null,
			'createTable: no fields specified for table "'.$name.'"');
			}
			$verify = $this->_verifyTableType($db->options['default_table_type']);
			if (PEAR::isError($verify)) {
			return $verify;
			}
			$query_fields = $this->getFieldDeclarationList($fields);
			if (PEAR::isError($query_fields)) {
			return $db->raiseError(MDB2_ERROR_CANNOT_CREATE, null, null,
			'createTable: '.$this->getUserinfo());
			}
			$query = "CREATE TABLE $name ($query_fields)".(strlen($db->options['default_table_type'])
			? ' TYPE='.$db->options['default_table_type'] : '');

			return $db->query($query);
			}

			// }}}
			// {{{ alterTable()

			/**
			* alter an existing table
			*
			* @param string $name name of the table that is intended to be changed.
			* @param array $changes associative array that contains the details of each type
			* of change that is intended to be performed. The types of
			* changes that are currently supported are defined as follows:
			*
			* name
			*
			* New name for the table.
			*
			* add
			*
			* Associative array with the names of fields to be added as
			* indexes of the array. The value of each entry of the array
			* should be set to another associative array with the properties
			* of the fields to be added. The properties of the fields should
			* be the same as defined by the Metabase parser.
			*
			*
			* remove
			*
			* Associative array with the names of fields to be removed as indexes
			* of the array. Currently the values assigned to each entry are ignored.
			* An empty array should be used for future compatibility.
			*
			* rename
			*
			* Associative array with the names of fields to be renamed as indexes
			* of the array. The value of each entry of the array should be set to
			* another associative array with the entry named name with the new
			* field name and the entry named Declaration that is expected to contain
			* the portion of the field declaration already in DBMS specific SQL code
			* as it is used in the CREATE TABLE statement.
			*
			* change
			*
			* Associative array with the names of the fields to be changed as indexes
			* of the array. Keep in mind that if it is intended to change either the
			* name of a field and any other properties, the change array entries
			* should have the new names of the fields as array indexes.
			*
			* The value of each entry of the array should be set to another associative
			* array with the properties of the fields to that are meant to be changed as
			* array entries. These entries should be assigned to the new values of the
			* respective properties. The properties of the fields should be the same
			* as defined by the Metabase parser.
			*
			* Example
			* array(
			* 'name' => 'userlist',
			* 'add' => array(
			* 'quota' => array(
			* 'type' => 'integer',
			* 'unsigned' => 1
			* )
			* ),
			* 'remove' => array(
			* 'file_limit' => array(),
			* 'time_limit' => array()
			* ),
			* 'change' => array(
			* 'gender' => array(
			* 'default' => 'M',
			* )
			* ),
			* 'rename' => array(
			* 'sex' => array(
			* 'name' => 'gender',
			* )
			* )
			* )
			*
			* @param boolean $check indicates whether the function should just check if the DBMS driver
			* can perform the requested table alterations if the value is true or
			* actually perform them otherwise.
			* @access public
			*
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			*/
			function alterTable($name, $changes, $check)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			foreach ($changes as $change_name => $change) {
			switch ($change_name) {
			case 'add':
			case 'remove':
			case 'change':
			case 'rename':
			case 'name':
			break;
			default:
			return $db->raiseError(MDB2_ERROR_CANNOT_ALTER, null, null,
			'alterTable: change type "'.$change_name.'" not yet supported');
			}
			}

			if ($check) {
			return MDB2_OK;
			}

			$query = (array_key_exists('name', $changes) ? 'RENAME AS '.$changes['name'] : '');

			if (array_key_exists('add', $changes)) {
			foreach ($changes['add'] as $field_name => $field) {
			$type_declaration = $db->getDeclaration($field['type'], $field_name, $field);
			if (PEAR::isError($type_declaration)) {
			return $err;
			}
			if ($query) {
			$query.= ', ';
			}
			$query.= 'ADD ' . $type_declaration;
			}
			}

			if (array_key_exists('remove', $changes)) {
			foreach ($changes['remove'] as $field_name => $field) {
			if ($query) {
			$query.= ', ';
			}
			$query.= 'DROP ' . $field_name;
			}
			}

			$rename = array();
			if (array_key_exists('rename', $changes)) {
			foreach ($changes['rename'] as $field_name => $field) {
			$rename[$field['name']] = $field_name;
			}
			}

			if (array_key_exists('change', $changes)) {
			foreach ($changes['change'] as $field_name => $field) {
			if ($query) {
			$query.= ', ';
			}
			if (isset($rename[$field_name])) {
			$old_field_name = $rename[$field_name];
			unset($rename[$field_name]);
			} else {
			$old_field_name = $field_name;
			}
			$query.= "CHANGE $field_name " . $db->getDeclaration($field['type'], $old_field_name, $field);
			}
			}

			if (!empty($rename)) {
			foreach ($rename as $rename_name => $renamed_field) {
			if ($query) {
			$query.= ', ';
			}
			$old_field_name = $renamed_field;
			$field = $changes['rename'][$old_field_name];
			$query.= 'CHANGE ' . $db->getDeclaration($field['type'], $old_field_name, $field);
			}
			}

			if (!$query) {
			return MDB2_OK;
			}

			return $db->query("ALTER TABLE $name $query");
			}

			// }}}
			// {{{ listDatabases()

			/**
			* list all databases
			*
			* @return mixed data array on success, a MDB2 error on failure
			* @access public
			*/
			function listDatabases()
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$databases = $db->queryCol('SHOW DATABASES');
			return $databases;
			}

			// }}}
			// {{{ listUsers()

			/**
			* list all users
			*
			* @return mixed data array on success, a MDB2 error on failure
			* @access public
			*/
			function listUsers()
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$users = $db->queryCol('SELECT DISTINCT USER FROM USER');
			return $users;
			}

			// }}}
			// {{{ listTables()

			/**
			* list all tables in the current database
			*
			* @return mixed data array on success, a MDB2 error on failure
			* @access public
			*/
			function listTables()
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$table_names = $db->queryCol('SHOW TABLES');
			if (PEAR::isError($table_names)) {
			return $table_names;
			}

			$tables = array();
			for ($i = 0, $j = count($table_names); $i < $j; ++$i) {
			if (!$this->_isSequenceName($table_names[$i]))
			$tables[] = $table_names[$i];
			}

			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$tables = array_map(($db->options['field_case'] == CASE_LOWER ? 'strtolower' : 'strtoupper'), $tables);
			}

			return $tables;
			}

			// }}}
			// {{{ listTableFields()

			/**
			* list all fields in a tables in the current database
			*
			* @param string $table name of table that should be used in method
			* @return mixed data array on success, a MDB2 error on failure
			* @access public
			*/
			function listTableFields($table)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$fields = $db->queryCol("SHOW COLUMNS FROM $table");
			if (PEAR::isError($fields)) {
			return $fields;
			}

			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$fields = array_map(($db->options['field_case'] == CASE_LOWER ? 'strtolower' : 'strtoupper'), $fields);
			}

			return $fields;
			}

			// }}}
			// {{{ createIndex()

			/**
			* get the stucture of a field into an array
			*
			* @param string $table name of the table on which the index is to be created
			* @param string $name name of the index to be created
			* @param array $definition associative array that defines properties of the index to be created.
			* Currently, only one property named FIELDS is supported. This property
			* is also an associative with the names of the index fields as array
			* indexes. Each entry of this array is set to another type of associative
			* array that specifies properties of the index that are specific to
			* each field.
			*
			* Currently, only the sorting property is supported. It should be used
			* to define the sorting direction of the index. It may be set to either
			* ascending or descending.
			*
			* Not all DBMS support index sorting direction configuration. The DBMS
			* drivers of those that do not support it ignore this property. Use the
			* function supports() to determine whether the DBMS driver can manage indexes.

			* Example
			* array(
			* 'fields' => array(
			* 'user_name' => array(
			* 'sorting' => 'ascending'
			* ),
			* 'last_login' => array()
			* )
			* )
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function createIndex($table, $name, $definition)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			if (array_key_exists('primary', $definition) && $definition['primary']) {
			$type = 'PRIMARY';
			$name = 'KEY';
			} elseif (array_key_exists('unique', $definition) && $definition['unique']) {
			$type = 'UNIQUE';
			} else {
			$type = 'INDEX';
			}

			$query = "ALTER TABLE $table ADD $type $name (";
			$query.= implode(', ', array_keys($definition['fields']));
			$query.= ')';

			return $db->query($query);
			}

			// }}}
			// {{{ dropIndex()

			/**
			* drop existing index
			*
			* @param string $table name of table that should be used in method
			* @param string $name name of the index to be dropped
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function dropIndex($table, $name)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			return $db->query("ALTER TABLE $table DROP INDEX $name");
			}

			// }}}
			// {{{ listTableIndexes()

			/**
			* list all indexes in a table
			*
			* @param string $table name of table that should be used in method
			* @return mixed data array on success, a MDB2 error on failure
			* @access public
			*/
			function listTableIndexes($table)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$key_name = 'Key_name';
			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			if ($db->options['field_case'] == CASE_LOWER) {
			$key_name = strtolower($key_name);
			} else {
			$key_name = strtoupper($key_name);
			}
			}

			$query = "SHOW INDEX FROM $table";
			$indexes_all = $db->queryCol($query, 'text', $key_name);
			if (PEAR::isError($indexes_all)) {
			return $indexes_all;
			}

			$indexes = array_unique($indexes_all);

			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$indexes = array_map(($db->options['field_case'] == CASE_LOWER ? 'strtolower' : 'strtoupper'), $indexes);
			}

			return $indexes;
			}

			// }}}
			// {{{ createSequence()

			/**
			* create sequence
			*
			* @param string $seq_name name of the sequence to be created
			* @param string $start start value of the sequence; default is 1
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function createSequence($seq_name, $start = 1)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$sequence_name = $db->getSequenceName($seq_name);
			$seqcol_name = $db->options['seqcol_name'];
			$result = $this->_verifyTableType($db->options['default_table_type']);
			if (PEAR::isError($result)) {
			return $result;
			}

			$res = $db->query("CREATE TABLE $sequence_name".
			"($seqcol_name INT NOT NULL AUTO_INCREMENT, PRIMARY KEY ($seqcol_name))".
			(strlen($db->options['default_table_type']) ? ' TYPE='.$db->options['default_table_type'] : '')
			);

			if (PEAR::isError($res)) {
			return $res;
			}

			if ($start == 1) {
			return MDB2_OK;
			}

			$res = $db->query("INSERT INTO $sequence_name ($seqcol_name) VALUES (".($start-1).')');
			if (!PEAR::isError($res)) {
			return MDB2_OK;
			}

			// Handle error
			$result = $db->query("DROP TABLE $sequence_name");
			if (PEAR::isError($result)) {
			return $db->raiseError(MDB2_ERROR, null, null,
			'createSequence: could not drop inconsistent sequence table ('.
			$result->getMessage().' ('.$result->getUserinfo().'))');
			}

			return $db->raiseError(MDB2_ERROR, null, null,
			'createSequence: could not create sequence table ('.
			$res->getMessage().' ('.$res->getUserinfo().'))');
			}

			// }}}
			// {{{ dropSequence()

			/**
			* drop existing sequence
			*
			* @param string $seq_name name of the sequence to be dropped
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function dropSequence($seq_name)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$sequence_name = $db->getSequenceName($seq_name);
			return $db->query("DROP TABLE $sequence_name");
			}

			// }}}
			// {{{ listSequences()

			/**
			* list all sequences in the current database
			*
			* @return mixed data array on success, a MDB2 error on failure
			* @access public
			*/
			function listSequences()
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$table_names = $db->queryCol('SHOW TABLES');
			if (PEAR::isError($table_names)) {
			return $table_names;
			}

			$sequences = array();
			for ($i = 0, $j = count($table_names); $i < $j; ++$i) {
			if ($sqn = $this->_isSequenceName($table_names[$i])) {
			$sequences[] = $sqn;
			}
			}

			return $sequences;
			}

			// }}}
			}
			<?php
			// +----------------------------------------------------------------------+
			// \| PHP versions 4 and 5 \|
			// +----------------------------------------------------------------------+
			// \| Copyright (c) 1998-2008 Manuel Lemos, Tomas V.V.Cox, \|
			// \| Stig. S. Bakken, Lukas Smith \|
			// \| All rights reserved. \|
			// +----------------------------------------------------------------------+
			// \| MDB2 is a merge of PEAR DB and Metabases that provides a unified DB \|
			// \| API as well as database abstraction for PHP applications. \|
			// \| This LICENSE is in the BSD license style. \|
			// \| \|
			// \| Redistribution and use in source and binary forms, with or without \|
			// \| modification, are permitted provided that the following conditions \|
			// \| are met: \|
			// \| \|
			// \| Redistributions of source code must retain the above copyright \|
			// \| notice, this list of conditions and the following disclaimer. \|
			// \| \|
			// \| Redistributions in binary form must reproduce the above copyright \|
			// \| notice, this list of conditions and the following disclaimer in the \|
			// \| documentation and/or other materials provided with the distribution. \|
			// \| \|
			// \| Neither the name of Manuel Lemos, Tomas V.V.Cox, Stig. S. Bakken, \|
			// \| Lukas Smith nor the names of his contributors may be used to endorse \|
			// \| or promote products derived from this software without specific prior\|
			// \| written permission. \|
			// \| \|
			// \| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS \|
			// \| "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT \|
			// \| LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS \|
			// \| FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE \|
			// \| REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, \|
			// \| INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, \|
			// \| BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS\|
			// \| OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED \|
			// \| AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT \|
			// \| LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY\|
			// \| WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE \|
			// \| POSSIBILITY OF SUCH DAMAGE. \|
			// +----------------------------------------------------------------------+
			// \| Author: Lukas Smith <smith@pooteeweet.org> \|
			// +----------------------------------------------------------------------+
			//
			// $Id: mysqli.php,v 1.95 2008/03/11 19:58:12 quipo Exp $
			//

			require_once 'MDB2/Driver/Manager/Common.php';

			/**
			* MDB2 MySQLi driver for the management modules
			*
			* @package MDB2
			* @category Database
			* @author Lukas Smith <smith@pooteeweet.org>
			*/
			class MDB2_Driver_Manager_mysqli extends MDB2_Driver_Manager_Common
			{

			// }}}
			// {{{ createDatabase()

			/**
			* create a new database
			*
			* @param string $name name of the database that should be created
			* @param array $options array with charset, collation info
			*
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function createDatabase($name, $options = array())
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$name = $db->quoteIdentifier($name, true);
			$query = 'CREATE DATABASE ' . $name;
			if (!empty($options['charset'])) {
			$query .= ' DEFAULT CHARACTER SET ' . $db->quote($options['charset'], 'text');
			}
			if (!empty($options['collation'])) {
			$query .= ' COLLATE ' . $db->quote($options['collation'], 'text');
			}
			return $db->standaloneQuery($query, null, true);
			}

			// }}}
			// {{{ alterDatabase()

			/**
			* alter an existing database
			*
			* @param string $name name of the database that is intended to be changed
			* @param array $options array with charset, collation info
			*
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function alterDatabase($name, $options = array())
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$query = 'ALTER DATABASE '. $db->quoteIdentifier($name, true);
			if (!empty($options['charset'])) {
			$query .= ' DEFAULT CHARACTER SET ' . $db->quote($options['charset'], 'text');
			}
			if (!empty($options['collation'])) {
			$query .= ' COLLATE ' . $db->quote($options['collation'], 'text');
			}
			return $db->standaloneQuery($query, null, true);
			}

			// }}}
			// {{{ dropDatabase()

			/**
			* drop an existing database
			*
			* @param string $name name of the database that should be dropped
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function dropDatabase($name)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$name = $db->quoteIdentifier($name, true);
			$query = "DROP DATABASE $name";
			return $db->standaloneQuery($query, null, true);
			}

			// }}}
			// {{{ _getAdvancedFKOptions()

			/**
			* Return the FOREIGN KEY query section dealing with non-standard options
			* as MATCH, INITIALLY DEFERRED, ON UPDATE, ...
			*
			* @param array $definition
			* @return string
			* @access protected
			*/
			function _getAdvancedFKOptions($definition)
			{
			$query = '';
			if (!empty($definition['match'])) {
			$query .= ' MATCH '.$definition['match'];
			}
			if (!empty($definition['onupdate'])) {
			$query .= ' ON UPDATE '.$definition['onupdate'];
			}
			if (!empty($definition['ondelete'])) {
			$query .= ' ON DELETE '.$definition['ondelete'];
			}
			return $query;
			}

			// }}}
			// {{{ createTable()

			/**
			* create a new table
			*
			* @param string $name Name of the database that should be created
			* @param array $fields Associative array that contains the definition of each field of the new table
			* The indexes of the array entries are the names of the fields of the table an
			* the array entry values are associative arrays like those that are meant to be
			* passed with the field definitions to get[Type]Declaration() functions.
			* array(
			* 'id' => array(
			* 'type' => 'integer',
			* 'unsigned' => 1
			* 'notnull' => 1
			* 'default' => 0
			* ),
			* 'name' => array(
			* 'type' => 'text',
			* 'length' => 12
			* ),
			* 'password' => array(
			* 'type' => 'text',
			* 'length' => 12
			* )
			* );
			* @param array $options An associative array of table options:
			* array(
			* 'comment' => 'Foo',
			* 'charset' => 'utf8',
			* 'collate' => 'utf8_unicode_ci',
			* 'type' => 'innodb',
			* );
			*
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function createTable($name, $fields, $options = array())
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			// if we have an AUTO_INCREMENT column and a PK on more than one field,
			// we have to handle it differently...
			$autoincrement = null;
			if (empty($options['primary'])) {
			$pk_fields = array();
			foreach ($fields as $fieldname => $def) {
			if (!empty($def['primary'])) {
			$pk_fields[$fieldname] = true;
			}
			if (!empty($def['autoincrement'])) {
			$autoincrement = $fieldname;
			}
			}
			if (!is_null($autoincrement) && count($pk_fields) > 1) {
			$options['primary'] = $pk_fields;
			} else {
			// the PK constraint is on max one field => OK
			$autoincrement = null;
			}
			}

			$query = $this->_getCreateTableQuery($name, $fields, $options);
			if (PEAR::isError($query)) {
			return $query;
			}

			if (!is_null($autoincrement)) {
			// we have to remove the PK clause added by _getIntegerDeclaration()
			$query = str_replace('AUTO_INCREMENT PRIMARY KEY', 'AUTO_INCREMENT', $query);
			}

			$options_strings = array();

			if (!empty($options['comment'])) {
			$options_strings['comment'] = 'COMMENT = '.$db->quote($options['comment'], 'text');
			}

			if (!empty($options['charset'])) {
			$options_strings['charset'] = 'DEFAULT CHARACTER SET '.$options['charset'];
			if (!empty($options['collate'])) {
			$options_strings['charset'].= ' COLLATE '.$options['collate'];
			}
			}

			$type = false;
			if (!empty($options['type'])) {
			$type = $options['type'];
			} elseif ($db->options['default_table_type']) {
			$type = $db->options['default_table_type'];
			}
			if ($type) {
			$options_strings[] = "ENGINE = $type";
			}

			if (!empty($options_strings)) {
			$query .= ' '.implode(' ', $options_strings);
			}
			$result = $db->exec($query);
			if (PEAR::isError($result)) {
			return $result;
			}
			return MDB2_OK;
			}

			// }}}
			// {{{ dropTable()

			/**
			* drop an existing table
			*
			* @param string $name name of the table that should be dropped
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function dropTable($name)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			//delete the triggers associated to existing FK constraints
			$constraints = $this->listTableConstraints($name);
			if (!PEAR::isError($constraints) && !empty($constraints)) {
			$db->loadModule('Reverse', null, true);
			foreach ($constraints as $constraint) {
			$definition = $db->reverse->getTableConstraintDefinition($name, $constraint);
			if (!PEAR::isError($definition) && !empty($definition['foreign'])) {
			$result = $this->_dropFKTriggers($name, $constraint, $definition['references']['table']);
			if (PEAR::isError($result)) {
			return $result;
			}
			}
			}
			}

			return parent::dropTable($name);
			}

			// }}}
			// {{{ truncateTable()

			/**
			* Truncate an existing table (if the TRUNCATE TABLE syntax is not supported,
			* it falls back to a DELETE FROM TABLE query)
			*
			* @param string $name name of the table that should be truncated
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function truncateTable($name)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$name = $db->quoteIdentifier($name, true);
			return $db->exec("TRUNCATE TABLE $name");
			}

			// }}}
			// {{{ vacuum()

			/**
			* Optimize (vacuum) all the tables in the db (or only the specified table)
			* and optionally run ANALYZE.
			*
			* @param string $table table name (all the tables if empty)
			* @param array $options an array with driver-specific options:
			* - timeout [int] (in seconds) [mssql-only]
			* - analyze [boolean] [pgsql and mysql]
			* - full [boolean] [pgsql-only]
			* - freeze [boolean] [pgsql-only]
			*
			* @return mixed MDB2_OK success, a MDB2 error on failure
			* @access public
			*/
			function vacuum($table = null, $options = array())
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			if (empty($table)) {
			$table = $this->listTables();
			if (PEAR::isError($table)) {
			return $table;
			}
			}
			if (is_array($table)) {
			foreach (array_keys($table) as $k) {
			$table[$k] = $db->quoteIdentifier($table[$k], true);
			}
			$table = implode(', ', $table);
			} else {
			$table = $db->quoteIdentifier($table, true);
			}

			$result = $db->exec('OPTIMIZE TABLE '.$table);
			if (PEAR::isError($result)) {
			return $result;
			}
			if (!empty($options['analyze'])) {
			return $db->exec('ANALYZE TABLE '.$table);
			}
			return MDB2_OK;
			}

			// }}}
			// {{{ alterTable()

			/**
			* alter an existing table
			*
			* @param string $name name of the table that is intended to be changed.
			* @param array $changes associative array that contains the details of each type
			* of change that is intended to be performed. The types of
			* changes that are currently supported are defined as follows:
			*
			* name
			*
			* New name for the table.
			*
			* add
			*
			* Associative array with the names of fields to be added as
			* indexes of the array. The value of each entry of the array
			* should be set to another associative array with the properties
			* of the fields to be added. The properties of the fields should
			* be the same as defined by the MDB2 parser.
			*
			*
			* remove
			*
			* Associative array with the names of fields to be removed as indexes
			* of the array. Currently the values assigned to each entry are ignored.
			* An empty array should be used for future compatibility.
			*
			* rename
			*
			* Associative array with the names of fields to be renamed as indexes
			* of the array. The value of each entry of the array should be set to
			* another associative array with the entry named name with the new
			* field name and the entry named Declaration that is expected to contain
			* the portion of the field declaration already in DBMS specific SQL code
			* as it is used in the CREATE TABLE statement.
			*
			* change
			*
			* Associative array with the names of the fields to be changed as indexes
			* of the array. Keep in mind that if it is intended to change either the
			* name of a field and any other properties, the change array entries
			* should have the new names of the fields as array indexes.
			*
			* The value of each entry of the array should be set to another associative
			* array with the properties of the fields to that are meant to be changed as
			* array entries. These entries should be assigned to the new values of the
			* respective properties. The properties of the fields should be the same
			* as defined by the MDB2 parser.
			*
			* Example
			* array(
			* 'name' => 'userlist',
			* 'add' => array(
			* 'quota' => array(
			* 'type' => 'integer',
			* 'unsigned' => 1
			* )
			* ),
			* 'remove' => array(
			* 'file_limit' => array(),
			* 'time_limit' => array()
			* ),
			* 'change' => array(
			* 'name' => array(
			* 'length' => '20',
			* 'definition' => array(
			* 'type' => 'text',
			* 'length' => 20,
			* ),
			* )
			* ),
			* 'rename' => array(
			* 'sex' => array(
			* 'name' => 'gender',
			* 'definition' => array(
			* 'type' => 'text',
			* 'length' => 1,
			* 'default' => 'M',
			* ),
			* )
			* )
			* )
			*
			* @param boolean $check indicates whether the function should just check if the DBMS driver
			* can perform the requested table alterations if the value is true or
			* actually perform them otherwise.
			* @access public
			*
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			*/
			function alterTable($name, $changes, $check)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			foreach ($changes as $change_name => $change) {
			switch ($change_name) {
			case 'add':
			case 'remove':
			case 'change':
			case 'rename':
			case 'name':
			break;
			default:
			return $db->raiseError(MDB2_ERROR_CANNOT_ALTER, null, null,
			'change type "'.$change_name.'" not yet supported', __FUNCTION__);
			}
			}

			if ($check) {
			return MDB2_OK;
			}

			$query = '';
			if (!empty($changes['name'])) {
			$change_name = $db->quoteIdentifier($changes['name'], true);
			$query .= 'RENAME TO ' . $change_name;
			}

			if (!empty($changes['add']) && is_array($changes['add'])) {
			foreach ($changes['add'] as $field_name => $field) {
			if ($query) {
			$query.= ', ';
			}
			$query.= 'ADD ' . $db->getDeclaration($field['type'], $field_name, $field);
			}
			}

			if (!empty($changes['remove']) && is_array($changes['remove'])) {
			foreach ($changes['remove'] as $field_name => $field) {
			if ($query) {
			$query.= ', ';
			}
			$field_name = $db->quoteIdentifier($field_name, true);
			$query.= 'DROP ' . $field_name;
			}
			}

			$rename = array();
			if (!empty($changes['rename']) && is_array($changes['rename'])) {
			foreach ($changes['rename'] as $field_name => $field) {
			$rename[$field['name']] = $field_name;
			}
			}

			if (!empty($changes['change']) && is_array($changes['change'])) {
			foreach ($changes['change'] as $field_name => $field) {
			if ($query) {
			$query.= ', ';
			}
			if (isset($rename[$field_name])) {
			$old_field_name = $rename[$field_name];
			unset($rename[$field_name]);
			} else {
			$old_field_name = $field_name;
			}
			$old_field_name = $db->quoteIdentifier($old_field_name, true);
			$query.= "CHANGE $old_field_name " . $db->getDeclaration($field['definition']['type'], $field_name, $field['definition']);
			}
			}

			if (!empty($rename) && is_array($rename)) {
			foreach ($rename as $rename_name => $renamed_field) {
			if ($query) {
			$query.= ', ';
			}
			$field = $changes['rename'][$renamed_field];
			$renamed_field = $db->quoteIdentifier($renamed_field, true);
			$query.= 'CHANGE ' . $renamed_field . ' ' . $db->getDeclaration($field['definition']['type'], $field['name'], $field['definition']);
			}
			}

			if (!$query) {
			return MDB2_OK;
			}

			$name = $db->quoteIdentifier($name, true);
			return $db->exec("ALTER TABLE $name $query");
			}

			// }}}
			// {{{ listDatabases()

			/**
			* list all databases
			*
			* @return mixed array of database names on success, a MDB2 error on failure
			* @access public
			*/
			function listDatabases()
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$result = $db->queryCol('SHOW DATABASES');
			if (PEAR::isError($result)) {
			return $result;
			}
			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_map(($db->options['field_case'] == CASE_LOWER ? 'strtolower' : 'strtoupper'), $result);
			}
			return $result;
			}

			// }}}
			// {{{ listUsers()

			/**
			* list all users
			*
			* @return mixed array of user names on success, a MDB2 error on failure
			* @access public
			*/
			function listUsers()
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			return $db->queryCol('SELECT DISTINCT USER FROM mysql.USER');
			}

			// }}}
			// {{{ listFunctions()

			/**
			* list all functions in the current database
			*
			* @return mixed array of function names on success, a MDB2 error on failure
			* @access public
			*/
			function listFunctions()
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$query = "SELECT name FROM mysql.proc";
			/*
			SELECT ROUTINE_NAME
			FROM INFORMATION_SCHEMA.ROUTINES
			WHERE ROUTINE_TYPE = 'FUNCTION'
			*/
			$result = $db->queryCol($query);
			if (PEAR::isError($result)) {
			return $result;
			}
			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_map(($db->options['field_case'] == CASE_LOWER ? 'strtolower' : 'strtoupper'), $result);
			}
			return $result;
			}

			// }}}
			// {{{ listTableTriggers()

			/**
			* list all triggers in the database that reference a given table
			*
			* @param string table for which all referenced triggers should be found
			* @return mixed array of trigger names on success, a MDB2 error on failure
			* @access public
			*/
			function listTableTriggers($table = null)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$query = 'SHOW TRIGGERS';
			if (!is_null($table)) {
			$table = $db->quote($table, 'text');
			$query .= " LIKE $table";
			}
			$result = $db->queryCol($query);
			if (PEAR::isError($result)) {
			return $result;
			}
			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_map(($db->options['field_case'] == CASE_LOWER ? 'strtolower' : 'strtoupper'), $result);
			}
			return $result;
			}

			// }}}
			// {{{ listTables()

			/**
			* list all tables in the current database
			*
			* @param string database, the current is default
			* @return mixed array of table names on success, a MDB2 error on failure
			* @access public
			*/
			function listTables($database = null)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$query = "SHOW /!50002 FULL/ TABLES";
			if (!is_null($database)) {
			$query .= " FROM $database";
			}
			$query.= "/!50002 WHERE Table_type = 'BASE TABLE'/";

			$table_names = $db->queryAll($query, null, MDB2_FETCHMODE_ORDERED);
			if (PEAR::isError($table_names)) {
			return $table_names;
			}

			$result = array();
			foreach ($table_names as $table) {
			if (!$this->_fixSequenceName($table[0], true)) {
			$result[] = $table[0];
			}
			}
			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_map(($db->options['field_case'] == CASE_LOWER ? 'strtolower' : 'strtoupper'), $result);
			}
			return $result;
			}

			// }}}
			// {{{ listViews()

			/**
			* list all views in the current database
			*
			* @param string database, the current is default
			* @return mixed array of view names on success, a MDB2 error on failure
			* @access public
			*/
			function listViews($database = null)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$query = 'SHOW FULL TABLES';
			if (!is_null($database)) {
			$query.= " FROM $database";
			}
			$query.= " WHERE Table_type = 'VIEW'";

			$result = $db->queryCol($query);
			if (PEAR::isError($result)) {
			return $result;
			}

			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_map(($db->options['field_case'] == CASE_LOWER ? 'strtolower' : 'strtoupper'), $result);
			}
			return $result;
			}

			// }}}
			// {{{ listTableFields()

			/**
			* list all fields in a table in the current database
			*
			* @param string $table name of table that should be used in method
			* @return mixed array of field names on success, a MDB2 error on failure
			* @access public
			*/
			function listTableFields($table)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$table = $db->quoteIdentifier($table, true);
			$result = $db->queryCol("SHOW COLUMNS FROM $table");
			if (PEAR::isError($result)) {
			return $result;
			}
			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_map(($db->options['field_case'] == CASE_LOWER ? 'strtolower' : 'strtoupper'), $result);
			}
			return $result;
			}

			// }}}
			// {{{ createIndex()

			/**
			* Get the stucture of a field into an array
			*
			* @author Leoncx
			* @param string $table name of the table on which the index is to be created
			* @param string $name name of the index to be created
			* @param array $definition associative array that defines properties of the index to be created.
			* Currently, only one property named FIELDS is supported. This property
			* is also an associative with the names of the index fields as array
			* indexes. Each entry of this array is set to another type of associative
			* array that specifies properties of the index that are specific to
			* each field.
			*
			* Currently, only the sorting property is supported. It should be used
			* to define the sorting direction of the index. It may be set to either
			* ascending or descending.
			*
			* Not all DBMS support index sorting direction configuration. The DBMS
			* drivers of those that do not support it ignore this property. Use the
			* function supports() to determine whether the DBMS driver can manage indexes.
			*
			* Example
			* array(
			* 'fields' => array(
			* 'user_name' => array(
			* 'sorting' => 'ascending'
			* 'length' => 10
			* ),
			* 'last_login' => array()
			* )
			* )
			*
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function createIndex($table, $name, $definition)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$table = $db->quoteIdentifier($table, true);
			$name = $db->quoteIdentifier($db->getIndexName($name), true);
			$query = "CREATE INDEX $name ON $table";
			$fields = array();
			foreach ($definition['fields'] as $field => $fieldinfo) {
			if (!empty($fieldinfo['length'])) {
			$fields[] = $db->quoteIdentifier($field, true) . '(' . $fieldinfo['length'] . ')';
			} else {
			$fields[] = $db->quoteIdentifier($field, true);
			}
			}
			$query .= ' ('. implode(', ', $fields) . ')';
			return $db->exec($query);
			}

			// }}}
			// {{{ dropIndex()

			/**
			* drop existing index
			*
			* @param string $table name of table that should be used in method
			* @param string $name name of the index to be dropped
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function dropIndex($table, $name)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$table = $db->quoteIdentifier($table, true);
			$name = $db->quoteIdentifier($db->getIndexName($name), true);
			return $db->exec("DROP INDEX $name ON $table");
			}

			// }}}
			// {{{ listTableIndexes()

			/**
			* list all indexes in a table
			*
			* @param string $table name of table that should be used in method
			* @return mixed array of index names on success, a MDB2 error on failure
			* @access public
			*/
			function listTableIndexes($table)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$key_name = 'Key_name';
			$non_unique = 'Non_unique';
			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			if ($db->options['field_case'] == CASE_LOWER) {
			$key_name = strtolower($key_name);
			$non_unique = strtolower($non_unique);
			} else {
			$key_name = strtoupper($key_name);
			$non_unique = strtoupper($non_unique);
			}
			}

			$table = $db->quoteIdentifier($table, true);
			$query = "SHOW INDEX FROM $table";
			$indexes = $db->queryAll($query, null, MDB2_FETCHMODE_ASSOC);
			if (PEAR::isError($indexes)) {
			return $indexes;
			}

			$result = array();
			foreach ($indexes as $index_data) {
			if ($index_data[$non_unique] && ($index = $this->_fixIndexName($index_data[$key_name]))) {
			$result[$index] = true;
			}
			}

			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_change_key_case($result, $db->options['field_case']);
			}
			return array_keys($result);
			}

			// }}}
			// {{{ createConstraint()

			/**
			* create a constraint on a table
			*
			* @param string $table name of the table on which the constraint is to be created
			* @param string $name name of the constraint to be created
			* @param array $definition associative array that defines properties of the constraint to be created.
			* Currently, only one property named FIELDS is supported. This property
			* is also an associative with the names of the constraint fields as array
			* constraints. Each entry of this array is set to another type of associative
			* array that specifies properties of the constraint that are specific to
			* each field.
			*
			* Example
			* array(
			* 'fields' => array(
			* 'user_name' => array(),
			* 'last_login' => array()
			* )
			* )
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function createConstraint($table, $name, $definition)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$type = '';
			$name = $db->quoteIdentifier($db->getIndexName($name), true);
			if (!empty($definition['primary'])) {
			$type = 'PRIMARY';
			$name = 'KEY';
			} elseif (!empty($definition['unique'])) {
			$type = 'UNIQUE';
			} elseif (!empty($definition['foreign'])) {
			$type = 'CONSTRAINT';
			}
			if (empty($type)) {
			return $db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
			'invalid definition, could not create constraint', __FUNCTION__);
			}

			$table_quoted = $db->quoteIdentifier($table, true);
			$query = "ALTER TABLE $table_quoted ADD $type $name";
			if (!empty($definition['foreign'])) {
			$query .= ' FOREIGN KEY';
			}
			$fields = array();
			foreach (array_keys($definition['fields']) as $field) {
			$fields[] = $db->quoteIdentifier($field, true);
			}
			$query .= ' ('. implode(', ', $fields) . ')';
			if (!empty($definition['foreign'])) {
			$query.= ' REFERENCES ' . $db->quoteIdentifier($definition['references']['table'], true);
			$referenced_fields = array();
			foreach (array_keys($definition['references']['fields']) as $field) {
			$referenced_fields[] = $db->quoteIdentifier($field, true);
			}
			$query .= ' ('. implode(', ', $referenced_fields) . ')';
			$query .= $this->_getAdvancedFKOptions($definition);
			}
			$res = $db->exec($query);
			if (PEAR::isError($res)) {
			return $res;
			}
			if (!empty($definition['foreign'])) {
			return $this->_createFKTriggers($table, array($name => $definition));
			}
			return MDB2_OK;
			}

			// }}}
			// {{{ dropConstraint()

			/**
			* drop existing constraint
			*
			* @param string $table name of table that should be used in method
			* @param string $name name of the constraint to be dropped
			* @param string $primary hint if the constraint is primary
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function dropConstraint($table, $name, $primary = false)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			if ($primary \|\| strtolower($name) == 'primary') {
			$query = 'ALTER TABLE '. $db->quoteIdentifier($table, true) .' DROP PRIMARY KEY';
			return $db->exec($query);
			}

			//is it a FK constraint? If so, also delete the associated triggers
			$db->loadModule('Reverse', null, true);
			$definition = $db->reverse->getTableConstraintDefinition($table, $name);
			if (!PEAR::isError($definition) && !empty($definition['foreign'])) {
			//first drop the FK enforcing triggers
			$result = $this->_dropFKTriggers($table, $name, $definition['references']['table']);
			if (PEAR::isError($result)) {
			return $result;
			}
			//then drop the constraint itself
			$table = $db->quoteIdentifier($table, true);
			$name = $db->quoteIdentifier($db->getIndexName($name), true);
			$query = "ALTER TABLE $table DROP FOREIGN KEY $name";
			return $db->exec($query);
			}

			$table = $db->quoteIdentifier($table, true);
			$name = $db->quoteIdentifier($db->getIndexName($name), true);
			$query = "ALTER TABLE $table DROP INDEX $name";
			return $db->exec($query);
			}

			// }}}
			// {{{ _createFKTriggers()

			/**
			* Create triggers to enforce the FOREIGN KEY constraint on the table
			*
			* NB: since there's no RAISE_APPLICATION_ERROR facility in mysql,
			* we call a non-existent procedure to raise the FK violation message.
			* @see http://forums.mysql.com/read.php?99,55108,71877#msg-71877
			*
			* @param string $table table name
			* @param array $foreign_keys FOREIGN KEY definitions
			*
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access private
			*/
			function _createFKTriggers($table, $foreign_keys)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}
			// create triggers to enforce FOREIGN KEY constraints
			if ($db->supports('triggers') && !empty($foreign_keys)) {
			$table = $db->quoteIdentifier($table, true);
			foreach ($foreign_keys as $fkname => $fkdef) {
			if (empty($fkdef)) {
			continue;
			}
			//set actions to 'RESTRICT' if not set
			$fkdef['onupdate'] = empty($fkdef['onupdate']) ? 'RESTRICT' : strtoupper($fkdef['onupdate']);
			$fkdef['ondelete'] = empty($fkdef['ondelete']) ? 'RESTRICT' : strtoupper($fkdef['ondelete']);

			$trigger_names = array(
			'insert' => $fkname.'_insert_trg',
			'update' => $fkname.'_update_trg',
			'pk_update' => $fkname.'_pk_update_trg',
			'pk_delete' => $fkname.'_pk_delete_trg',
			);
			$table_fields = array_keys($fkdef['fields']);
			$referenced_fields = array_keys($fkdef['references']['fields']);

			//create the ON [UPDATE\|DELETE] triggers on the primary table
			$restrict_action = ' IF (SELECT ';
			$aliased_fields = array();
			foreach ($table_fields as $field) {
			$aliased_fields[] = $table .'.'.$field .' AS '.$field;
			}
			$restrict_action .= implode(',', $aliased_fields)
			.' FROM '.$table
			.' WHERE ';
			$conditions = array();
			$new_values = array();
			$null_values = array();
			for ($i=0; $i<count($table_fields); $i++) {
			$conditions[] = $table_fields[$i] .' = OLD.'.$referenced_fields[$i];
			$new_values[] = $table_fields[$i] .' = NEW.'.$referenced_fields[$i];
			$null_values[] = $table_fields[$i] .' = NULL';
			}
			$restrict_action .= implode(' AND ', $conditions).') IS NOT NULL'
			.' THEN CALL %s_ON_TABLE_'.$table.'_VIOLATES_FOREIGN_KEY_CONSTRAINT();'
			.' END IF;';

			$cascade_action_update = 'UPDATE '.$table.' SET '.implode(', ', $new_values) .' WHERE '.implode(' AND ', $conditions). ';';
			$cascade_action_delete = 'DELETE FROM '.$table.' WHERE '.implode(' AND ', $conditions). ';';
			$setnull_action = 'UPDATE '.$table.' SET '.implode(', ', $null_values).' WHERE '.implode(' AND ', $conditions). ';';

			if ('SET DEFAULT' == $fkdef['onupdate'] \|\| 'SET DEFAULT' == $fkdef['ondelete']) {
			$db->loadModule('Reverse', null, true);
			$default_values = array();
			foreach ($table_fields as $table_field) {
			$field_definition = $db->reverse->getTableFieldDefinition($table, $field);
			if (PEAR::isError($field_definition)) {
			return $field_definition;
			}
			$default_values[] = $table_field .' = '. $field_definition[0]['default'];
			}
			$setdefault_action = 'UPDATE '.$table.' SET '.implode(', ', $default_values).' WHERE '.implode(' AND ', $conditions). ';';
			}

			$query = 'CREATE TRIGGER %s'
			.' %s ON '.$fkdef['references']['table']
			.' FOR EACH ROW BEGIN '
			.' SET FOREIGN_KEY_CHECKS = 0; '; //only really needed for ON UPDATE CASCADE

			if ('CASCADE' == $fkdef['onupdate']) {
			$sql_update = sprintf($query, $trigger_names['pk_update'], 'BEFORE UPDATE', 'update') . $cascade_action_update;
			} elseif ('SET NULL' == $fkdef['onupdate']) {
			$sql_update = sprintf($query, $trigger_names['pk_update'], 'BEFORE UPDATE', 'update') . $setnull_action;
			} elseif ('SET DEFAULT' == $fkdef['onupdate']) {
			$sql_update = sprintf($query, $trigger_names['pk_update'], 'BEFORE UPDATE', 'update') . $setdefault_action;
			} elseif ('NO ACTION' == $fkdef['onupdate']) {
			$sql_update = sprintf($query.$restrict_action, $trigger_names['pk_update'], 'AFTER UPDATE', 'update');
			} else {
			//'RESTRICT'
			$sql_update = sprintf($query.$restrict_action, $trigger_names['pk_update'], 'BEFORE UPDATE', 'update');
			}
			if ('CASCADE' == $fkdef['ondelete']) {
			$sql_delete = sprintf($query, $trigger_names['pk_delete'], 'BEFORE DELETE', 'delete') . $cascade_action_delete;
			} elseif ('SET NULL' == $fkdef['ondelete']) {
			$sql_delete = sprintf($query, $trigger_names['pk_delete'], 'BEFORE DELETE', 'delete') . $setnull_action;
			} elseif ('SET DEFAULT' == $fkdef['ondelete']) {
			$sql_delete = sprintf($query, $trigger_names['pk_delete'], 'BEFORE DELETE', 'delete') . $setdefault_action;
			} elseif ('NO ACTION' == $fkdef['ondelete']) {
			$sql_delete = sprintf($query.$restrict_action, $trigger_names['pk_delete'], 'AFTER DELETE', 'delete');
			} else {
			//'RESTRICT'
			$sql_delete = sprintf($query.$restrict_action, $trigger_names['pk_delete'], 'BEFORE DELETE', 'delete');
			}
			$sql_update .= ' SET FOREIGN_KEY_CHECKS = 1; END;';
			$sql_delete .= ' SET FOREIGN_KEY_CHECKS = 1; END;';

			$db->pushErrorHandling(PEAR_ERROR_RETURN);
			$db->expectError(MDB2_ERROR_CANNOT_CREATE);
			$result = $db->exec($sql_delete);
			$expected_errmsg = 'This MySQL version doesn\'t support multiple triggers with the same action time and event for one table';
			$db->popExpect();
			$db->popErrorHandling();
			if (PEAR::isError($result)) {
			if ($result->getCode() != MDB2_ERROR_CANNOT_CREATE) {
			return $result;
			}
			$db->warnings[] = $expected_errmsg;
			}
			$db->pushErrorHandling(PEAR_ERROR_RETURN);
			$db->expectError(MDB2_ERROR_CANNOT_CREATE);
			$result = $db->exec($sql_update);
			$db->popExpect();
			$db->popErrorHandling();
			if (PEAR::isError($result) && $result->getCode() != MDB2_ERROR_CANNOT_CREATE) {
			if ($result->getCode() != MDB2_ERROR_CANNOT_CREATE) {
			return $result;
			}
			$db->warnings[] = $expected_errmsg;
			}
			}
			}
			return MDB2_OK;
			}

			// }}}
			// {{{ _dropFKTriggers()

			/**
			* Drop the triggers created to enforce the FOREIGN KEY constraint on the table
			*
			* @param string $table table name
			* @param string $fkname FOREIGN KEY constraint name
			* @param string $referenced_table referenced table name
			*
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access private
			*/
			function _dropFKTriggers($table, $fkname, $referenced_table)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$triggers = $this->listTableTriggers($table);
			$triggers2 = $this->listTableTriggers($referenced_table);
			if (!PEAR::isError($triggers2) && !PEAR::isError($triggers)) {
			$triggers = array_merge($triggers, $triggers2);
			$pattern = '/^'.$fkname.'(_pk)?_(insert\|update\|delete)_trg$/i';
			foreach ($triggers as $trigger) {
			if (preg_match($pattern, $trigger)) {
			$result = $db->exec('DROP TRIGGER '.$trigger);
			if (PEAR::isError($result)) {
			return $result;
			}
			}
			}
			}
			return MDB2_OK;
			}

			// }}}
			// {{{ listTableConstraints()

			/**
			* list all constraints in a table
			*
			* @param string $table name of table that should be used in method
			* @return mixed array of constraint names on success, a MDB2 error on failure
			* @access public
			*/
			function listTableConstraints($table)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$key_name = 'Key_name';
			$non_unique = 'Non_unique';
			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			if ($db->options['field_case'] == CASE_LOWER) {
			$key_name = strtolower($key_name);
			$non_unique = strtolower($non_unique);
			} else {
			$key_name = strtoupper($key_name);
			$non_unique = strtoupper($non_unique);
			}
			}

			$query = 'SHOW INDEX FROM ' . $db->quoteIdentifier($table, true);
			$indexes = $db->queryAll($query, null, MDB2_FETCHMODE_ASSOC);
			if (PEAR::isError($indexes)) {
			return $indexes;
			}

			$result = array();
			foreach ($indexes as $index_data) {
			if (!$index_data[$non_unique]) {
			if ($index_data[$key_name] !== 'PRIMARY') {
			$index = $this->_fixIndexName($index_data[$key_name]);
			} else {
			$index = 'PRIMARY';
			}
			if (!empty($index)) {
			$result[$index] = true;
			}
			}
			}

			//list FOREIGN KEY constraints...
			$query = 'SHOW CREATE TABLE '. $db->escape($table);
			$definition = $db->queryOne($query, 'text', 1);
			if (!PEAR::isError($definition) && !empty($definition)) {
			$pattern = '/\bCONSTRAINT\b\s+([^\s]+)\s+\bFOREIGN KEY\b/Uims';
			if (preg_match_all($pattern, str_replace('`', '', $definition), $matches) > 0) {
			foreach ($matches[1] as $constraint) {
			$result[$constraint] = true;
			}
			}
			}

			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_change_key_case($result, $db->options['field_case']);
			}
			return array_keys($result);
			}

			// }}}
			// {{{ createSequence()

			/**
			* create sequence
			*
			* @param string $seq_name name of the sequence to be created
			* @param string $start start value of the sequence; default is 1
			* @param array $options An associative array of table options:
			* array(
			* 'comment' => 'Foo',
			* 'charset' => 'utf8',
			* 'collate' => 'utf8_unicode_ci',
			* 'type' => 'innodb',
			* );
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function createSequence($seq_name, $start = 1, $options = array())
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$sequence_name = $db->quoteIdentifier($db->getSequenceName($seq_name), true);
			$seqcol_name = $db->quoteIdentifier($db->options['seqcol_name'], true);

			$options_strings = array();

			if (!empty($options['comment'])) {
			$options_strings['comment'] = 'COMMENT = '.$db->quote($options['comment'], 'text');
			}

			if (!empty($options['charset'])) {
			$options_strings['charset'] = 'DEFAULT CHARACTER SET '.$options['charset'];
			if (!empty($options['collate'])) {
			$options_strings['charset'].= ' COLLATE '.$options['collate'];
			}
			}

			$type = false;
			if (!empty($options['type'])) {
			$type = $options['type'];
			} elseif ($db->options['default_table_type']) {
			$type = $db->options['default_table_type'];
			}
			if ($type) {
			$options_strings[] = "ENGINE = $type";
			}

			$query = "CREATE TABLE $sequence_name ($seqcol_name INT NOT NULL AUTO_INCREMENT, PRIMARY KEY ($seqcol_name))";
			if (!empty($options_strings)) {
			$query .= ' '.implode(' ', $options_strings);
			}
			$res = $db->exec($query);
			if (PEAR::isError($res)) {
			return $res;
			}

			if ($start == 1) {
			return MDB2_OK;
			}

			$query = "INSERT INTO $sequence_name ($seqcol_name) VALUES (".($start-1).')';
			$res = $db->exec($query);
			if (!PEAR::isError($res)) {
			return MDB2_OK;
			}

			// Handle error
			$result = $db->exec("DROP TABLE $sequence_name");
			if (PEAR::isError($result)) {
			return $db->raiseError($result, null, null,
			'could not drop inconsistent sequence table', __FUNCTION__);
			}

			return $db->raiseError($res, null, null,
			'could not create sequence table', __FUNCTION__);
			}

			// }}}
			// {{{ dropSequence()

			/**
			* drop existing sequence
			*
			* @param string $seq_name name of the sequence to be dropped
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function dropSequence($seq_name)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$sequence_name = $db->quoteIdentifier($db->getSequenceName($seq_name), true);
			return $db->exec("DROP TABLE $sequence_name");
			}

			// }}}
			// {{{ listSequences()

			/**
			* list all sequences in the current database
			*
			* @param string database, the current is default
			* @return mixed array of sequence names on success, a MDB2 error on failure
			* @access public
			*/
			function listSequences($database = null)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$query = "SHOW TABLES";
			if (!is_null($database)) {
			$query .= " FROM $database";
			}
			$table_names = $db->queryCol($query);
			if (PEAR::isError($table_names)) {
			return $table_names;
			}

			$result = array();
			foreach ($table_names as $table_name) {
			if ($sqn = $this->_fixSequenceName($table_name, true)) {
			$result[] = $sqn;
			}
			}
			if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
			$result = array_map(($db->options['field_case'] == CASE_LOWER ? 'strtolower' : 'strtoupper'), $result);
			}
			return $result;
			}

			// }}}
			}
			?>