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

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

	/**
	* MDB2 SQLite driver for the management modules
	*
	* @package MDB2
	* @category Database
	* @author Lukas Smith <smith@backendmedia.com>
	*/
	class MDB2_Driver_Manager_sqlite extends MDB2_Driver_Manager_Common
	{
	// {{{ createDatabase()

	/**
	* create a new database
	*
	* @param string $name name of the database that should be created
	* @return mixed MDB2_OK on success, a MDB2 error on failure
	* @access public
	*/
	function createDatabase($name)
	{
	$db =& $GLOBALS['_MDB2_databases'][$this->db_index];
	$database_file = $db->_getDatabaseFile($name);
	if (file_exists($database_file)) {
	return $db->raiseError(MDB2_ERROR_CANNOT_CREATE, null, null,
	'createDatabase: database already exists');
	}
	$php_errormsg = '';
	$handle = @sqlite_open($database_file, $db->dsn['mode'], $php_errormsg);
	if (!$handle) {
	return $db->raiseError(MDB2_ERROR_CANNOT_CREATE, null, null,
	'createDatabase: '.(isset($php_errormsg) ? $php_errormsg : 'could not create the database file'));
	}
	@sqlite_close($handle);
	return MDB2_OK;
	}

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

	/**
	* drop an existing database
	*
	* @param string $name name of the database that should be dropped
	* @return mixed MDB2_OK on success, a MDB2 error on failure
	* @access public
	*/
	function dropDatabase($name)
	{
	$db =& $GLOBALS['_MDB2_databases'][$this->db_index];
	$database_file = $db->_getDatabaseFile($name);
	if (!@file_exists($database_file)) {
	return $db->raiseError(MDB2_ERROR_CANNOT_DROP, null, null,
	'dropDatabase: database does not exist');
	}
	$result = @unlink($database_file);
	if (!$result) {
	return $db->raiseError(MDB2_ERROR_CANNOT_DROP, null, null,
	'dropDatabase: '.(isset($php_errormsg) ? $php_errormsg : 'could not remove the database file'));
	}
	return MDB2_OK;
	}

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

	/**
	* list all databases
	*
	* @return mixed data array on success, a MDB2 error on failure
	* @access public
	*/
	function listDatabases()
	{
	$db =& $GLOBALS['_MDB2_databases'][$this->db_index];
	return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
	'listDatabases: list databases is not supported');
	}

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

	/**
	* list all users
	*
	* @return mixed data array on success, a MDB2 error on failure
	* @access public
	*/
	function listUsers()
	{
	$db =& $GLOBALS['_MDB2_databases'][$this->db_index];
	return $db->queryCol('SELECT DISTINCT USER FROM USER');
	}

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

	/**
	* list all tables in the current database
	*
	* @return mixed data array on success, a MDB2 error on failure
	* @access public
	*/
	function listTables()
	{
	$db =& $GLOBALS['_MDB2_databases'][$this->db_index];
	$query = "SELECT name FROM sqlite_master WHERE type='table' AND sql NOT NULL ORDER BY name";
	$table_names = $db->queryCol($query);
	if (PEAR::isError($table_names)) {
	return $table_names;
	}
	$tables = array();
	for ($i = 0, $j = count($table_names); $i < $j; ++$i) {
	if (!$this->_isSequenceName($table_names[$i]))
	$tables[] = $table_names[$i];
	}
	return $tables;
	}

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

	/**
	* list all fields in a tables in the current database
	*
	* @param string $table name of table that should be used in method
	* @return mixed data array on success, a MDB2 error on failure
	* @access public
	*/
	function listTableFields($table)
	{
	$db =& $GLOBALS['_MDB2_databases'][$this->db_index];
	$query = "SELECT * FROM $table";
	$db->setLimit(1);
	$result = $db->query($query);
	if (PEAR::isError($result)) {
	return $result;
	}
	$columns = $result->getColumnNames();
	$result->free();
	if (PEAR::isError($columns)) {
	return $columns;
	}
	return array_flip($columns);
	}

	// }}}
	// {{{ 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 support() 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 =& $GLOBALS['_MDB2_databases'][$this->db_index];
	$query = 'CREATE '.(isset($definition['unique']) ? 'UNIQUE' : '')." INDEX $name ON $table (";
	$skipped_first = false;
	foreach ($definition['fields'] as $field_name => $field) {
	if ($skipped_first) {
	$query .= ',';
	}
	$query .= $field_name;
	$skipped_first = true;
	}
	$query .= ')';
	return $db->query($query);
	}

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

	/**
	* drop existing index
	*
	* @param string $table name of table that should be used in method
	* @param string $name name of the index to be dropped
	* @return mixed MDB2_OK on success, a MDB2 error on failure
	* @access public
	*/
	function dropIndex($table, $name)
	{
	$db =& $GLOBALS['_MDB2_databases'][$this->db_index];
	return $db->query("DROP INDEX $name");
	}

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

	/**
	* list all indexes in a table
	*
	* @param string $table name of table that should be used in method
	* @return mixed data array on success, a MDB2 error on failure
	* @access public
	*/
	function listTableIndexes($table)
	{
	$db =& $GLOBALS['_MDB2_databases'][$this->db_index];
	$query = "SELECT name FROM sqlite_master WHERE type='index' AND tbl_name='$table' AND sql NOT NULL ORDER BY name";
	$indexes_all = $db->queryCol($query);
	if (PEAR::isError($indexes_all)) {
	return $indexes_all;
	}
	$found = $indexes = array();
	foreach ($indexes_all as $index => $index_name) {
	if ($indexes_all[$index] != 'PRIMARY' && !isset($found[$index_name])) {
	$indexes[] = $index_name;
	$found[$index_name] = true;
	}
	}
	return $indexes;
	}

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

	/**
	* create sequence
	*
	* @param string $seq_name name of the sequence to be created
	* @param string $start start value of the sequence; default is 1
	* @return mixed MDB2_OK on success, a MDB2 error on failure
	* @access public
	*/
	function createSequence($seq_name, $start = 1)
	{
	$db =& $GLOBALS['_MDB2_databases'][$this->db_index];
	$sequence_name = $db->getSequenceName($seq_name);
	$seqcol_name = $db->options['seqcol_name'];
	$query = "CREATE TABLE $sequence_name ($seqcol_name INTEGER PRIMARY KEY DEFAULT 0 NOT NULL)";
	$res = $db->query($query);
	if (PEAR::isError($res)) {
	return $res;
	}
	if ($start == 1) {
	return MDB2_OK;
	}
	$res = $db->query("INSERT INTO $sequence_name ($seqcol_name) VALUES (".($start-1).')');
	if (!PEAR::isError($res)) {
	return MDB2_OK;
	}
	// Handle error
	$result = $db->query("DROP TABLE $sequence_name");
	if (PEAR::isError($result)) {
	return $db->raiseError(MDB2_ERROR, null, null,
	'createSequence: could not drop inconsistent sequence table ('.
	$result->getMessage().' ('.$result->getUserinfo().'))');
	}
	return $db->raiseError(MDB2_ERROR, null, null,
	'createSequence: could not create sequence table ('.
	$res->getMessage().' ('.$res->getUserinfo().'))');
	}

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

	/**
	* drop existing sequence
	*
	* @param string $seq_name name of the sequence to be dropped
	* @return mixed MDB2_OK on success, a MDB2 error on failure
	* @access public
	*/
	function dropSequence($seq_name)
	{
	$db =& $GLOBALS['_MDB2_databases'][$this->db_index];
	$sequence_name = $db->getSequenceName($seq_name);
	return $db->query("DROP TABLE $sequence_name");
	}

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

	/**
	* list all sequences in the current database
	*
	* @return mixed data array on success, a MDB2 error on failure
	* @access public
	*/
	function listSequences()
	{
	$db =& $GLOBALS['_MDB2_databases'][$this->db_index];
	$query = "SELECT name FROM sqlite_master WHERE type='table' AND sql NOT NULL ORDER BY name";
	$table_names = $db->queryCol($query);
	if (PEAR::isError($table_names)) {
	return $table_names;
	}
	$sequences = array();
	for ($i = 0, $j = count($table_names); $i < $j; ++$i) {
	if ($sqn = $this->_isSequenceName($table_names[$i]))
	$sequences[] = $sqn;
	}
	return $sequences;
	}

	// }}}
	}
	?>

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