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			<?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. \|
			// +----------------------------------------------------------------------+
			// \| Authors: Lukas Smith <smith@pooteeweet.org> \|
			// \| Lorenzo Alberton <l.alberton@quipo.it> \|
			// +----------------------------------------------------------------------+
			//
			// $Id: Common.php 273526 2009-01-14 15:01:21Z quipo $
			//

			/**
			* @package MDB2
			* @category Database
			* @author Lukas Smith <smith@pooteeweet.org>
			* @author Lorenzo Alberton <l.alberton@quipo.it>
			*/

			/**
			* Base class for the management modules that is extended by each MDB2 driver
			*
			* To load this module in the MDB2 object:
			* $mdb->loadModule('Manager');
			*
			* @package MDB2
			* @category Database
			* @author Lukas Smith <smith@pooteeweet.org>
			*/
			class MDB2_Driver_Manager_Common extends MDB2_Module_Common
			{
			// {{{ splitTableSchema()

			/**
			* Split the "[owner\|schema].table" notation into an array
			*
			* @param string $table [schema and] table name
			*
			* @return array array(schema, table)
			* @access private
			*/
			function splitTableSchema($table)
			{
			$ret = array();
			if (strpos($table, '.') !== false) {
			return explode('.', $table);
			}
			return array(null, $table);
			}

			// }}}
			// {{{ getFieldDeclarationList()

			/**
			* Get declaration of a number of field in bulk
			*
			* @param array $fields a multidimensional associative array.
			* The first dimension determines the field name, while the second
			* dimension is keyed with the name of the properties
			* of the field being declared as array indexes. Currently, the types
			* of supported field properties are as follows:
			*
			* default
			* Boolean value to be used as default for this field.
			*
			* notnull
			* Boolean flag that indicates whether this field is constrained
			* to not be set to null.
			*
			* @return mixed string on success, a MDB2 error on failure
			* @access public
			*/
			function getFieldDeclarationList($fields)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			if (!is_array($fields) \|\| empty($fields)) {
			return $db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
			'missing any fields', __FUNCTION__);
			}
			foreach ($fields as $field_name => $field) {
			$query = $db->getDeclaration($field['type'], $field_name, $field);
			if (PEAR::isError($query)) {
			return $query;
			}
			$query_fields[] = $query;
			}
			return implode(', ', $query_fields);
			}

			// }}}
			// {{{ _fixSequenceName()

			/**
			* Removes any formatting in an sequence name using the 'seqname_format' option
			*
			* @param string $sqn string that containts name of a potential sequence
			* @param bool $check if only formatted sequences should be returned
			* @return string name of the sequence with possible formatting removed
			* @access protected
			*/
			function _fixSequenceName($sqn, $check = false)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$seq_pattern = '/^'.preg_replace('/%s/', '([a-z0-9_]+)', $db->options['seqname_format']).'$/i';
			$seq_name = preg_replace($seq_pattern, '\\1', $sqn);
			if ($seq_name && !strcasecmp($sqn, $db->getSequenceName($seq_name))) {
			return $seq_name;
			}
			if ($check) {
			return false;
			}
			return $sqn;
			}

			// }}}
			// {{{ _fixIndexName()

			/**
			* Removes any formatting in an index name using the 'idxname_format' option
			*
			* @param string $idx string that containts name of anl index
			* @return string name of the index with eventual formatting removed
			* @access protected
			*/
			function _fixIndexName($idx)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$idx_pattern = '/^'.preg_replace('/%s/', '([a-z0-9_]+)', $db->options['idxname_format']).'$/i';
			$idx_name = preg_replace($idx_pattern, '\\1', $idx);
			if ($idx_name && !strcasecmp($idx, $db->getIndexName($idx_name))) {
			return $idx_name;
			}
			return $idx;
			}

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

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

			return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
			'method not implemented', __FUNCTION__);
			}

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

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

			return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
			'method not implemented', __FUNCTION__);
			}

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

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

			return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
			'method not implemented', __FUNCTION__);
			}

			// }}}
			// {{{ _getCreateTableQuery()

			/**
			* Create a basic SQL query for a new table creation
			*
			* @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
			* @param array $options An associative array of table options
			*
			* @return mixed string (the SQL query) on success, a MDB2 error on failure
			* @see createTable()
			*/
			function _getCreateTableQuery($name, $fields, $options = array())
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			if (!$name) {
			return $db->raiseError(MDB2_ERROR_CANNOT_CREATE, null, null,
			'no valid table name specified', __FUNCTION__);
			}
			if (empty($fields)) {
			return $db->raiseError(MDB2_ERROR_CANNOT_CREATE, null, null,
			'no fields specified for table "'.$name.'"', __FUNCTION__);
			}
			$query_fields = $this->getFieldDeclarationList($fields);
			if (PEAR::isError($query_fields)) {
			return $query_fields;
			}
			if (!empty($options['primary'])) {
			$query_fields.= ', PRIMARY KEY ('.implode(', ', array_keys($options['primary'])).')';
			}

			$name = $db->quoteIdentifier($name, true);
			$result = 'CREATE ';
			if (!empty($options['temporary'])) {
			$result .= $this->_getTemporaryTableQuery();
			}
			$result .= " TABLE $name ($query_fields)";
			return $result;
			}

			// }}}
			// {{{ _getTemporaryTableQuery()

			/**
			* A method to return the required SQL string that fits between CREATE ... TABLE
			* to create the table as a temporary table.
			*
			* Should be overridden in driver classes to return the correct string for the
			* specific database type.
			*
			* The default is to return the string "TEMPORARY" - this will result in a
			* SQL error for any database that does not support temporary tables, or that
			* requires a different SQL command from "CREATE TEMPORARY TABLE".
			*
			* @return string The string required to be placed between "CREATE" and "TABLE"
			* to generate a temporary table, if possible.
			*/
			function _getTemporaryTableQuery()
			{
			return 'TEMPORARY';
			}

			// }}}
			// {{{ 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 $options An associative array of table options:
			* array(
			* 'comment' => 'Foo',
			* 'temporary' => true\|false,
			* );
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function createTable($name, $fields, $options = array())
			{
			$query = $this->_getCreateTableQuery($name, $fields, $options);
			if (PEAR::isError($query)) {
			return $query;
			}
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}
			$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;
			}

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

			return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
			'method not implemented', __FUNCTION__);
			}

			// }}}
			// {{{ 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;
			}

			return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
			'method not implemented', __FUNCTION__);
			}

			// }}}
			// {{{ 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;
			}

			return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
			'method not implementedd', __FUNCTION__);
			}

			// }}}
			// {{{ 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->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
			'method not implemented', __FUNCTION__);
			}

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

			/**
			* list all views in the current database
			*
			* @param string database, the current is default
			* NB: not all the drivers can get the view names from
			* a database other than the current one
			* @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;
			}

			return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
			'method not implemented', __FUNCTION__);
			}

			// }}}
			// {{{ listTableViews()

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

			return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
			'method not implemented', __FUNCTION__);
			}

			// }}}
			// {{{ 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;
			}

			return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
			'method not implemented', __FUNCTION__);
			}

			// }}}
			// {{{ 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;
			}

			return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
			'method not implemented', __FUNCTION__);
			}

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

			/**
			* list all tables in the current database
			*
			* @param string database, the current is default.
			* NB: not all the drivers can get the table names from
			* a database other than the current one
			* @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;
			}

			return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
			'method not implemented', __FUNCTION__);
			}

			// }}}
			// {{{ 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;
			}

			return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
			'method not implemented', __FUNCTION__);
			}

			// }}}
			// {{{ 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;
			}

			$table = $db->quoteIdentifier($table, true);
			$name = $db->quoteIdentifier($db->getIndexName($name), true);
			$query = "CREATE INDEX $name ON $table";
			$fields = array();
			foreach (array_keys($definition['fields']) as $field) {
			$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;
			}

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

			// }}}
			// {{{ 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;
			}

			return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
			'method not implemented', __FUNCTION__);
			}

			// }}}
			// {{{ _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)
			{
			return '';
			}

			// }}}
			// {{{ 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 $definition associative array that defines properties of the constraint to be created.
			* The full structure of the array looks like this:
			* <pre>
			* array (
			* [primary] => 0
			* [unique] => 0
			* [foreign] => 1
			* [check] => 0
			* [fields] => array (
			* [field1name] => array() // one entry per each field covered
			* [field2name] => array() // by the index
			* [field3name] => array(
			* [sorting] => ascending
			* [position] => 3
			* )
			* )
			* [references] => array(
			* [table] => name
			* [fields] => array(
			* [field1name] => array( //one entry per each referenced field
			* [position] => 1
			* )
			* )
			* )
			* [deferrable] => 0
			* [initiallydeferred] => 0
			* [onupdate] => CASCADE\|RESTRICT\|SET NULL\|SET DEFAULT\|NO ACTION
			* [ondelete] => CASCADE\|RESTRICT\|SET NULL\|SET DEFAULT\|NO ACTION
			* [match] => SIMPLE\|PARTIAL\|FULL
			* );
			* </pre>
			* @return mixed MDB2_OK on success, a MDB2 error on failure
			* @access public
			*/
			function createConstraint($table, $name, $definition)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}
			$table = $db->quoteIdentifier($table, true);
			$name = $db->quoteIdentifier($db->getIndexName($name), true);
			$query = "ALTER TABLE $table ADD CONSTRAINT $name";
			if (!empty($definition['primary'])) {
			$query.= ' PRIMARY KEY';
			} elseif (!empty($definition['unique'])) {
			$query.= ' UNIQUE';
			} elseif (!empty($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);
			}
			return $db->exec($query);
			}

			// }}}
			// {{{ 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;
			}

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

			// }}}
			// {{{ 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;
			}

			return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
			'method not implemented', __FUNCTION__);
			}

			// }}}
			// {{{ 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;
			}

			return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
			'method not implemented', __FUNCTION__);
			}

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

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

			return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
			'method not implemented', __FUNCTION__);
			}

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

			/**
			* list all sequences in the current database
			*
			* @param string database, the current is default
			* NB: not all the drivers can get the sequence names from
			* a database other than the current one
			* @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;
			}

			return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
			'method not implemented', __FUNCTION__);
			}

			// }}}
			}
			?>