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<?php
// +----------------------------------------------------------------------+
// | PHP Version 4 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1998-2004 Manuel Lemos, Tomas V.V.Cox, |
// | Stig. S. Bakken, Lukas Smith |
// | All rights reserved. |
// +----------------------------------------------------------------------+
// | MDB 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@backendmedia.com> |
// +----------------------------------------------------------------------+
//
// $Id: mysql.php,v 1.44.4.10 2004/04/19 20:21:51 lsmith Exp $
//
if(!defined('MDB_MANAGER_MYSQL_INCLUDED'))
{
define('MDB_MANAGER_MYSQL_INCLUDED', 1);
require_once('MDB/Modules/Manager/Common.php');
/**
* MDB MySQL driver for the management modules
*
* @package MDB
* @category Database
* @access private
* @author Lukas Smith <smith@backendmedia.com>
*/
class MDB_Manager_mysql extends MDB_Manager_Common
{
// {{{ properties
var $verified_table_types = array();
// }}}
// {{{ _verifyTransactionalTableType()
/**
* verify that chosen transactional table hanlder is available in the database
*
* @param object $db database object that is extended by this class
* @param string $table_type name of the table handler
* @return mixed MDB_OK on success, a MDB error on failure
* @access private
*/
function _verifyTransactionalTableType(&$db, $table_type)
{
switch(strtoupper($table_type)) {
case 'BERKELEYDB':
case 'BDB':
$check = array('have_bdb');
break;
case 'INNODB':
$check = array('have_innobase', 'have_innodb');
break;
case 'GEMINI':
$check = array('have_gemini');
break;
case 'HEAP':
case 'ISAM':
case 'MERGE':
case 'MRG_MYISAM':
case 'MYISAM':
case '':
return(MDB_OK);
default:
return($db->raiseError(MDB_ERROR_UNSUPPORTED, NULL, NULL,
'Verify transactional table',
$table_type.' is not a supported table type'));
}
if(isset($this->verified_table_types[$table_type])
&& $this->verified_table_types[$table_type] == $db->connection)
{
return(MDB_OK);
}
$not_supported = FALSE;
for($i=0, $j=count($check); $i<$j; ++$i) {
$query = 'SHOW VARIABLES LIKE '.$db->getValue('text', $check[$i]);
$has = $db->queryRow($query, NULL, MDB_FETCHMODE_ORDERED);
if (MDB::isError($has)) {
return $has;
}
if (is_array($has)) {
$not_supported = TRUE;
if ($has[1] == 'YES') {
$this->verified_table_types[$table_type] = $db->connection;
return(MDB_OK);
}
}
}
if ($not_supported) {
return($db->raiseError(MDB_ERROR_UNSUPPORTED, null, null,
$table_type.' is not a supported table type by this MySQL database server'));
}
return($db->raiseError(MDB_ERROR_UNSUPPORTED, null, null,
'could not tell if '.$table_type.' is a supported table type'));
}
// }}}
// {{{ createDatabase()
/**
* create a new database
*
* @param object $db database object that is extended by this class
* @param string $name name of the database that should be created
* @return mixed MDB_OK on success, a MDB error on failure
* @access public
*/
function createDatabase(&$db, $name)
{
if (MDB::isError($result = $db->connect())) {
return($result);
}
$query = 'CREATE DATABASE '.$name;
if(MDB::isError($db->query($query))) {
return($db->mysqlRaiseError());
}
return(MDB_OK);
}
// }}}
// {{{ dropDatabase()
/**
* drop an existing database
*
* @param object $db database object that is extended by this class
* @param string $name name of the database that should be dropped
* @return mixed MDB_OK on success, a MDB error on failure
* @access public
*/
function dropDatabase(&$db, $name)
{
if (MDB::isError($result = $db->connect())) {
return($result);
}
$query = 'DROP DATABASE '.$name;
if(MDB::isError($db->query($query))) {
return($db->mysqlRaiseError());
}
return(MDB_OK);
}
// }}}
// {{{ createTable()
/**
* create a new table
*
* @param object $db database object that is extended by this class
* @param string $name Name of the database that should be created
* @param array $fields Associative array that contains the definition of
* each field of the new table. The indexes of the array
* entries are the names of the fields of the table an
* the array entry values are associative arrays like
* those that are meant to be passed with the field
* definitions to get[Type]Declaration() functions.
*
* Example
* array(
*
* 'id' => array(
* 'type' => 'integer',
* 'unsigned' => 1
* 'notnull' => 1
* 'default' => 0
* ),
* 'name' => array(
* 'type' => 'text',
* 'length' => 12
* ),
* 'password' => array(
* 'type' => 'text',
* 'length' => 12
* )
* );
* @return mixed MDB_OK on success, a MDB error on failure
* @access public
*/
function createTable(&$db, $name, $fields)
{
if (!isset($name) || !strcmp($name, '')) {
return($db->raiseError(MDB_ERROR_CANNOT_CREATE, NULL, NULL,
'no valid table name specified'));
}
if (count($fields) == 0) {
return($db->raiseError(MDB_ERROR_CANNOT_CREATE, NULL, NULL,
'no fields specified for table "'.$name.'"'));
}
$verify = $this->_verifyTransactionalTableType($db, $db->default_table_type);
if(MDB::isError($verify)) {
return($verify);
}
if (MDB::isError($query_fields = $db->getFieldDeclarationList($fields))) {
return($db->raiseError(MDB_ERROR_CANNOT_CREATE, NULL, NULL, 'unkown error'));
}
if (isset($db->supported['Transactions'])
&& $db->default_table_type=='BDB'
) {
$query_fields .= ', dummy_primary_key INT NOT NULL AUTO_INCREMENT, PRIMARY KEY (dummy_primary_key)';
}
$query = "CREATE TABLE $name ($query_fields)".
(strlen($db->default_table_type) ? ' TYPE='.$db->default_table_type : '');
return($db->query($query));
}
// }}}
// {{{ alterTable()
/**
* alter an existing table
*
* @param object $db database object that is extended by this class
* @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.
*
* AddedFields
*
* 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.
*
* Additionally, there should be an 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.
*
* RemovedFields
*
* 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.
*
* RenamedFields
*
* 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.
*
* ChangedFields
*
* 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 ChangedFields 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.
*
* If the default property is meant to be added, removed or changed, there
* should also be an entry with index ChangedDefault assigned to 1. Similarly,
* if the notnull constraint is to be added or removed, there should also be
* an entry with index ChangedNotNull assigned to 1.
*
* Additionally, there should be an entry named Declaration that is expected
* to contain the portion of the field changed declaration already in DBMS
* specific SQL code as it is used in the CREATE TABLE statement.
* Example
* array(
* 'name' => 'userlist',
* 'AddedFields' => array(
* 'quota' => array(
* 'type' => 'integer',
* 'unsigned' => 1
* 'Declaration' => 'quota INT'
* )
* ),
* 'RemovedFields' => array(
* 'file_limit' => array(),
* 'time_limit' => array()
* ),
* 'ChangedFields' => array(
* 'gender' => array(
* 'default' => 'M',
* 'ChangeDefault' => 1,
* 'Declaration' => "gender CHAR(1) DEFAULT 'M'"
* )
* ),
* 'RenamedFields' => array(
* 'sex' => array(
* 'name' => 'gender',
* 'Declaration' => "gender CHAR(1) DEFAULT 'M'"
* )
* )
* )
*
* @param boolean $check indicates whether the function should just check if the DBMS driver
* can perform the requested table alterations if the value is true or
* actually perform them otherwise.
* @access public
*
* @return mixed MDB_OK on success, a MDB error on failure
*/
function alterTable(&$db, $name, $changes, $check)
{
if ($check) {
for($change = 0,reset($changes);
$change < count($changes);
next($changes), $change++)
{
switch(key($changes)) {
case 'AddedFields':
case 'RemovedFields':
case 'ChangedFields':
case 'RenamedFields':
case 'name':
break;
default:
return($db->raiseError(MDB_ERROR_CANNOT_ALTER, NULL, NULL,
'Alter table: change type "'.key($changes).'" not yet supported'));
}
}
return(MDB_OK);
} else {
$query = (isset($changes['name']) ? 'RENAME AS '.$changes['name'] : '');
if (isset($changes['AddedFields'])) {
$fields = $changes['AddedFields'];
for($field = 0, reset($fields);
$field<count($fields);
next($fields), $field++)
{
if (strcmp($query, '')) {
$query .= ',';
}
$query .= 'ADD '.$fields[key($fields)]['Declaration'];
}
}
if (isset($changes['RemovedFields'])) {
$fields = $changes['RemovedFields'];
for($field = 0,reset($fields);
$field<count($fields);
next($fields), $field++)
{
if (strcmp($query, '')) {
$query .= ',';
}
$query .= 'DROP '.key($fields);
}
}
$renamed_fields = array();
if (isset($changes['RenamedFields'])) {
$fields = $changes['RenamedFields'];
for($field = 0,reset($fields);
$field<count($fields);
next($fields), $field++)
{
$renamed_fields[$fields[key($fields)]['name']] = key($fields);
}
}
if (isset($changes['ChangedFields'])) {
$fields = $changes['ChangedFields'];
for($field = 0,reset($fields);
$field<count($fields);
next($fields), $field++)
{
if (strcmp($query, '')) {
$query .= ',';
}
if (isset($renamed_fields[key($fields)])) {
$field_name = $renamed_fields[key($fields)];
unset($renamed_fields[key($fields)]);
} else {
$field_name = key($fields);
}
$query .= "CHANGE $field_name ".$fields[key($fields)]['Declaration'];
}
}
if (count($renamed_fields))
{
for($field = 0,reset($renamed_fields);
$field<count($renamed_fields);
next($renamed_fields), $field++)
{
if (strcmp($query, '')) {
$query .= ',';
}
$old_field_name = $renamed_fields[Key($renamed_fields)];
$query .= "CHANGE $old_field_name ".
$changes['RenamedFields'][$old_field_name]['Declaration'];
}
}
return($db->query("ALTER TABLE $name $query"));
}
}
// }}}
// {{{ listDatabases()
/**
* list all databases
*
* @param object $db database object that is extended by this class
* @return mixed data array on success, a MDB error on failure
* @access public
*/
function listDatabases(&$db)
{
$result = $db->queryCol('SHOW DATABASES');
if(MDB::isError($result)) {
return($result);
}
return($result);
}
// }}}
// {{{ listUsers()
/**
* list all users
*
* @param object $db database object that is extended by this class
* @return mixed data array on success, a MDB error on failure
* @access public
*/
function listUsers(&$db)
{
$result = $db->queryCol('SELECT DISTINCT USER FROM USER');
if(MDB::isError($result)) {
return($result);
}
return($result);
}
// }}}
// {{{ listTables()
/**
* list all tables in the current database
*
* @param object $db database object that is extended by this class
* @return mixed data array on success, a MDB error on failure
* @access public
*/
function listTables(&$db)
{
$table_names = $db->queryCol('SHOW TABLES');
if(MDB::isError($table_names)) {
return($table_names);
}
for($i = 0, $j = count($table_names), $tables = array(); $i < $j; ++$i)
{
if (!$this->_isSequenceName($db, $table_names[$i]))
$tables[] = $table_names[$i];
}
return($tables);
}
// }}}
// {{{ listTableFields()
/**
* list all fields in a tables in the current database
*
* @param object $db database object that is extended by this class
* @param string $table name of table that should be used in method
* @return mixed data array on success, a MDB error on failure
* @access public
*/
function listTableFields(&$db, $table)
{
$result = $db->query("SHOW COLUMNS FROM $table");
if(MDB::isError($result)) {
return($result);
}
$columns = $db->getColumnNames($result);
if(MDB::isError($columns)) {
$db->freeResult($columns);
return($columns);
}
if ($db->options['optimize'] != 'portability') {
$columns = array_change_key_case($columns);
}
if(!isset($columns['field'])) {
$db->freeResult($result);
return($db->raiseError(MDB_ERROR_MANAGER, NULL, NULL,
'List table fields: show columns does not return the table field names'));
}
$fields = $db->fetchCol($result, $columns['field']);
if (!MDB::isError($fields)) {
$fields = array_diff($fields, array($db->dummy_primary_key));
}
$db->freeResult($result);
return($fields);
}
// }}}
// {{{ getTableFieldDefinition()
/**
* get the stucture of a field into an array
*
* @param object $db database object that is extended by this class
* @param string $table name of table that should be used in method
* @param string $field_name name of field that should be used in method
* @return mixed data array on success, a MDB error on failure
* @access public
*/
function getTableFieldDefinition(&$db, $table, $field_name)
{
if ($field_name == $db->dummy_primary_key) {
return($db->raiseError(MDB_ERROR_MANAGER, NULL, NULL,
'Get table field definiton: '.$db->dummy_primary_key.' is an hidden column'));
}
$result = $db->query("SHOW COLUMNS FROM $table");
if(MDB::isError($result)) {
return($result);
}
$columns = $db->getColumnNames($result);
if(MDB::isError($columns)) {
$db->freeResult($columns);
return($columns);
}
if ($db->options['optimize'] != 'portability') {
$columns = array_change_key_case($columns);
}
if (!isset($columns[$column = 'field'])
|| !isset($columns[$column = 'type']))
{
$db->freeResult($result);
return($db->raiseError(MDB_ERROR_MANAGER, NULL, NULL,
'Get table field definition: show columns does not return the column '.$column));
}
$field_column = $columns['field'];
$type_column = $columns['type'];
while (is_array($row = $db->fetchInto($result))) {
if ($field_name == $row[$field_column]) {
$db_type = strtolower($row[$type_column]);
$db_type = strtok($db_type, '(), ');
if ($db_type == 'national') {
$db_type = strtok('(), ');
}
$length = strtok('(), ');
$decimal = strtok('(), ');
$type = array();
switch($db_type) {
case 'tinyint':
case 'smallint':
case 'mediumint':
case 'int':
case 'integer':
case 'bigint':
$type[0] = 'integer';
if($length == '1') {
$type[1] = 'boolean';
if (preg_match('/^[is|has]/', $field_name)) {
$type = array_reverse($type);
}
}
break;
case 'tinytext':
case 'mediumtext':
case 'longtext':
case 'text':
case 'char':
case 'varchar':
$type[0] = 'text';
if($decimal == 'binary') {
$type[1] = 'blob';
} elseif($length == '1') {
$type[1] = 'boolean';
if (preg_match('/[is|has]/', $field_name)) {
$type = array_reverse($type);
}
} elseif(strstr($db_type, 'text'))
$type[1] = 'clob';
break;
case 'enum':
preg_match_all('/\'.+\'/U',$row[$type_column], $matches);
$length = 0;
if(is_array($matches)) {
foreach($matches[0] as $value) {
$length = max($length, strlen($value)-2);
}
}
unset($decimal);
case 'set':
$type[0] = 'text';
$type[1] = 'integer';
break;
case 'date':
$type[0] = 'date';
break;
case 'datetime':
case 'timestamp':
$type[0] = 'timestamp';
break;
case 'time':
$type[0] = 'time';
break;
case 'float':
case 'double':
case 'real':
$type[0] = 'float';
break;
case 'decimal':
case 'numeric':
$type[0] = 'decimal';
break;
case 'tinyblob':
case 'mediumblob':
case 'longblob':
case 'blob':
$type[0] = 'blob';
$type[1] = 'text';
break;
case 'year':
$type[0] = 'integer';
$type[1] = 'date';
break;
default:
return($db->raiseError(MDB_ERROR_MANAGER, NULL, NULL,
'List table fields: unknown database attribute type'));
}
unset($notnull);
if (isset($columns['null'])
&& $row[$columns['null']] != 'YES')
{
$notnull = 1;
}
unset($default);
if (isset($columns['default'])
&& isset($row[$columns['default']]))
{
$default = $row[$columns['default']];
}
$definition = $field_choices = array();
for($datatype = 0; $datatype < count($type); $datatype++) {
$field_choices[$datatype] = array('type' => $type[$datatype]);
if(isset($notnull)) {
$field_choices[$datatype]['notnull'] = 1;
}
if(isset($default)) {
$field_choices[$datatype]['default'] = $default;
}
if($type[$datatype] != 'boolean'
&& $type[$datatype] != 'time'
&& $type[$datatype] != 'date'
&& $type[$datatype] != 'timestamp')
{
if(strlen($length)) {
$field_choices[$datatype]['length'] = $length;
}
}
}
$definition[0] = $field_choices;
if (isset($columns['extra'])
&& isset($row[$columns['extra']])
&& $row[$columns['extra']] == 'auto_increment')
{
$implicit_sequence = array();
$implicit_sequence['on'] = array();
$implicit_sequence['on']['table'] = $table;
$implicit_sequence['on']['field'] = $field_name;
$definition[1]['name'] = $table.'_'.$field_name;
$definition[1]['definition'] = $implicit_sequence;
}
if (isset($columns['key'])
&& isset($row[$columns['key']])
&& $row[$columns['key']] == 'PRI')
{
// check that its not just a unique field
$query = "SHOW INDEX FROM $table";
$indexes = $db->queryAll($query, NULL, MDB_FETCHMODE_ASSOC);
if(MDB::isError($indexes)) {
return($indexes);
}
$is_primary = FALSE;
foreach($indexes as $index) {
if ($db->options['optimize'] != 'portability') {
array_change_key_case($index);
}
if ($index['key_name'] == 'PRIMARY'
&& $index['column_name'] == $field_name
) {
$is_primary = TRUE;
break;
}
}
if($is_primary) {
$implicit_index = array();
$implicit_index['unique'] = 1;
$implicit_index['FIELDS'][$field_name] = '';
$definition[2]['name'] = $field_name;
$definition[2]['definition'] = $implicit_index;
}
}
$db->freeResult($result);
return($definition);
}
}
if(!$db->options['autofree']) {
$db->freeResult($result);
}
if(MDB::isError($row)) {
return($row);
}
return($db->raiseError(MDB_ERROR_MANAGER, NULL, NULL,
'Get table field definition: it was not specified an existing table column'));
}
// }}}
// {{{ createIndex()
/**
* get the stucture of a field into an array
*
* @param object $db database object that is extended by this class
* @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 $definition associative array that defines properties of the index to be created.
* Currently, only one property named FIELDS is supported. This property
* is also an associative with the names of the index fields as array
* indexes. Each entry of this array is set to another type of associative
* array that specifies properties of the index that are specific to
* each field.
*
* Currently, only the sorting property is supported. It should be used
* to define the sorting direction of the index. It may be set to either
* ascending or descending.
*
* Not all DBMS support index sorting direction configuration. The DBMS
* drivers of those that do not support it ignore this property. Use the
* function support() to determine whether the DBMS driver can manage indexes.
* Example
* array(
* 'FIELDS' => array(
* 'user_name' => array(
* 'sorting' => 'ascending'
* ),
* 'last_login' => array()
* )
* )
* @return mixed MDB_OK on success, a MDB error on failure
* @access public
*/
function createIndex(&$db, $table, $name, $definition)
{
$query = "ALTER TABLE $table ADD ".(isset($definition['unique']) ? 'UNIQUE' : 'INDEX')
." $name (";
for($field = 0, reset($definition['FIELDS']);
$field < count($definition['FIELDS']);
$field++, next($definition['FIELDS']))
{
if ($field > 0) {
$query .= ',';
}
$query .= key($definition['FIELDS']);
}
$query .= ')';
return($db->query($query));
}
// }}}
// {{{ dropIndex()
/**
* drop existing index
*
* @param object $db database object that is extended by this class
* @param string $table name of table that should be used in method
* @param string $name name of the index to be dropped
* @return mixed MDB_OK on success, a MDB error on failure
* @access public
*/
function dropIndex(&$db, $table, $name)
{
return($db->query("ALTER TABLE $table DROP INDEX $name"));
}
// }}}
// {{{ listTableIndexes()
/**
* list all indexes in a table
*
* @param object $db database object that is extended by this class
* @param string $table name of table that should be used in method
* @return mixed data array on success, a MDB error on failure
* @access public
*/
function listTableIndexes(&$db, $table)
{
if(MDB::isError($result = $db->query("SHOW INDEX FROM $table"))) {
return($result);
}
$key_name = 'Key_name';
if ($db->options['optimize'] != 'portability') {
$key_name = strtolower($key_name);
}
$indexes_all = $db->fetchCol($result, $key_name);
for($found = $indexes = array(), $index = 0, $indexes_all_cnt = count($indexes_all);
$index < $indexes_all_cnt;
$index++)
{
if ($indexes_all[$index] != 'PRIMARY'
&& !isset($found[$indexes_all[$index]]))
{
$indexes[] = $indexes_all[$index];
$found[$indexes_all[$index]] = 1;
}
}
return($indexes);
}
// }}}
// {{{ getTableIndexDefinition()
/**
* get the stucture of an index into an array
*
* @param object $db database object that is extended by this class
* @param string $table name of table that should be used in method
* @param string $index_name name of index that should be used in method
* @return mixed data array on success, a MDB error on failure
* @access public
*/
function getTableIndexDefinition(&$db, $table, $index_name)
{
if($index_name == 'PRIMARY') {
return($db->raiseError(MDB_ERROR_MANAGER, NULL, NULL,
'Get table index definition: PRIMARY is an hidden index'));
}
if(MDB::isError($result = $db->query("SHOW INDEX FROM $table"))) {
return($result);
}
$definition = array();
while (is_array($row = $db->fetchInto($result, MDB_FETCHMODE_ASSOC))) {
if ($db->options['optimize'] != 'portability') {
$row = array_change_key_case($row);
}
$key_name = $row['key_name'];
if(!strcmp($index_name, $key_name)) {
if(!$row['non_unique']) {
$definition[$index_name]['unique'] = 1;
}
$column_name = $row['column_name'];
$definition['FIELDS'][$column_name] = array();
if(isset($row['collation'])) {
$definition['FIELDS'][$column_name]['sorting'] = ($row['collation'] == 'A' ? 'ascending' : 'descending');
}
}
}
$db->freeResult($result);
if (!isset($definition['FIELDS'])) {
return($db->raiseError(MDB_ERROR_MANAGER, NULL, NULL,
'Get table index definition: it was not specified an existing table index'));
}
return($definition);
}
// }}}
// {{{ createSequence()
/**
* create sequence
*
* @param object $db database object that is extended by this class
* @param string $seq_name name of the sequence to be created
* @param string $start start value of the sequence; default is 1
* @return mixed MDB_OK on success, a MDB error on failure
* @access public
*/
function createSequence(&$db, $seq_name, $start)
{
$sequence_name = $db->getSequenceName($seq_name);
$res = $db->query("CREATE TABLE $sequence_name
(".$db->options['sequence_col_name']." INT NOT NULL AUTO_INCREMENT, PRIMARY KEY ("
.$db->options['sequence_col_name']."))");
if (MDB::isError($res)) {
return($res);
}
if ($start == 1) {
return(MDB_OK);
}
$res = $db->query("INSERT INTO $sequence_name (".$db->options['sequence_col_name'].") VALUES (".($start-1).')');
if (!MDB::isError($res)) {
return(MDB_OK);
}
// Handle error
$result = $db->query("DROP TABLE $sequence_name");
if (MDB::isError($result)) {
return($db->raiseError(MDB_ERROR, NULL, NULL,
'Create sequence: could not drop inconsistent sequence table ('.
$result->getMessage().' ('.$result->getUserinfo().'))'));
}
return($db->raiseError(MDB_ERROR, NULL, NULL,
'Create sequence: could not create sequence table ('.
$res->getMessage().' ('.$res->getUserinfo().'))'));
}
// }}}
// {{{ dropSequence()
/**
* drop existing sequence
*
* @param object $db database object that is extended by this class
* @param string $seq_name name of the sequence to be dropped
* @return mixed MDB_OK on success, a MDB error on failure
* @access public
*/
function dropSequence(&$db, $seq_name)
{
$sequence_name = $db->getSequenceName($seq_name);
return($db->query("DROP TABLE $sequence_name"));
}
// }}}
// {{{ listSequences()
/**
* list all sequences in the current database
*
* @param object $db database object that is extended by this class
* @return mixed data array on success, a MDB error on failure
* @access public
*/
function listSequences(&$db)
{
$table_names = $db->queryCol('SHOW TABLES');
if(MDB::isError($table_names)) {
return($table_names);
}
for($i = 0, $j = count($table_names), $sequences = array(); $i < $j; ++$i)
{
if ($sqn = $this->_isSequenceName($db, $table_names[$i]))
$sequences[] = $sqn;
}
return($sequences);
}
// }}}
}
};
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