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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. |
// +----------------------------------------------------------------------+
// | Author: Lukas Smith <smith@pooteeweet.org> |
// +----------------------------------------------------------------------+
//
// $Id: mysql.php 292715 2009-12-28 14:06:34Z quipo $
//
require_once 'MDB2/Driver/Manager/Common.php';
/**
* MDB2 MySQL driver for the management modules
*
* @package MDB2
* @category Database
* @author Lukas Smith <smith@pooteeweet.org>
*/
class MDB2_Driver_Manager_mysql 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 ((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 (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 (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 (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 (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 = '';
$idx_name = $db->quoteIdentifier($db->getIndexName($name), true);
if (!empty($definition['primary'])) {
$type = 'PRIMARY';
$idx_name = 'KEY';
} elseif (!empty($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 $idx_name";
if (!empty($definition['foreign'])) {
$query .= ' FOREIGN KEY';
}
$fields = array();
foreach ($definition['fields'] as $field => $fieldinfo) {
$quoted = $db->quoteIdentifier($field, true);
if (!empty($fieldinfo['length'])) {
$quoted .= '(' . $fieldinfo['length'] . ')';
}
$fields[] = $quoted;
}
$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);
// add index on FK column(s) or we can't add a FK constraint
// @see http://forums.mysql.com/read.php?22,19755,226009
$result = $this->createIndex($table, $name.'_fkidx', $definition);
if (PEAR::isError($result)) {
return $result;
}
}
$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_quoted = $db->quoteIdentifier($table, true);
foreach ($foreign_keys as $fkname => $fkdef) {
if (empty($fkdef)) {
continue;
}
//set actions to default if not set
$fkdef['onupdate'] = empty($fkdef['onupdate']) ? $db->options['default_fk_action_onupdate'] : strtoupper($fkdef['onupdate']);
$fkdef['ondelete'] = empty($fkdef['ondelete']) ? $db->options['default_fk_action_ondelete'] : strtoupper($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[] = $table_quoted .'.'.$field .' AS '.$field;
}
$restrict_action .= implode(',', $aliased_fields)
.' FROM '.$table_quoted
.' 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';
}
$conditions2 = array();
if ('NO ACTION' != $fkdef['ondelete']) {
// There is no NEW row in on DELETE trigger
for ($i=0; $i<count($referenced_fields); $i++) {
$conditions2[] = 'NEW.'.$referenced_fields[$i] .' <> OLD.'.$referenced_fields[$i];
}
}
$restrict_action .= implode(' AND ', $conditions).') IS NOT NULL';
if (!empty($conditions2)) {
$restrict_action .= ' AND (' .implode(' OR ', $conditions2) .')';
}
$restrict_action .= ' THEN CALL %s_ON_TABLE_'.$table.'_VIOLATES_FOREIGN_KEY_CONSTRAINT();'
.' END IF;';
$cascade_action_update = 'UPDATE '.$table_quoted.' SET '.implode(', ', $new_values) .' WHERE '.implode(' AND ', $conditions). ';';
$cascade_action_delete = 'DELETE FROM '.$table_quoted.' WHERE '.implode(' AND ', $conditions). ';';
$setnull_action = 'UPDATE '.$table_quoted.' 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_quoted.' 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');
} elseif ('RESTRICT' == $fkdef['onupdate']) {
$sql_update = sprintf($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');
} elseif ('RESTRICT' == $fkdef['ondelete']) {
$sql_delete = sprintf($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 (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;
}
// }}}
}
?>

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