mirror of
https://github.com/dg/dibi.git
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398 lines
8.0 KiB
PHP
398 lines
8.0 KiB
PHP
<?php
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/**
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* dibi - tiny'n'smart database abstraction layer
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* ----------------------------------------------
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*
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* Copyright (c) 2005, 2008 David Grudl (http://davidgrudl.com)
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*
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* This source file is subject to the "dibi license" that is bundled
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* with this package in the file license.txt.
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*
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* For more information please see http://dibiphp.com
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*
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* @copyright Copyright (c) 2005, 2008 David Grudl
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* @license http://dibiphp.com/license dibi license
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* @link http://dibiphp.com
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* @package dibi
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* @version $Id$
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*/
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/**
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* The dibi driver for MS SQL database.
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*
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* Connection options:
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* - 'host' - the MS SQL server host name. It can also include a port number (hostname:port)
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* - 'username' (or 'user')
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* - 'password' (or 'pass')
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* - 'persistent' - try to find a persistent link?
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* - 'database' - the database name to select
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* - 'lazy' - if TRUE, connection will be established only when required
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*
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* @author David Grudl
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* @copyright Copyright (c) 2005, 2008 David Grudl
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* @package dibi
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*/
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class DibiMsSqlDriver extends DibiObject implements IDibiDriver
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{
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/** @var resource Connection resource */
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private $connection;
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/** @var resource Resultset resource */
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private $resultSet;
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/**
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* @throws DibiException
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*/
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public function __construct()
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{
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if (!extension_loaded('mssql')) {
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throw new DibiDriverException("PHP extension 'mssql' is not loaded.");
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}
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}
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/**
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* Connects to a database.
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* @return void
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* @throws DibiException
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*/
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public function connect(array &$config)
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{
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DibiConnection::alias($config, 'username', 'user');
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DibiConnection::alias($config, 'password', 'pass');
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DibiConnection::alias($config, 'host', 'hostname');
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if (empty($config['persistent'])) {
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$this->connection = @mssql_connect($config['host'], $config['username'], $config['password'], TRUE); // intentionally @
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} else {
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$this->connection = @mssql_pconnect($config['host'], $config['username'], $config['password']); // intentionally @
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}
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if (!is_resource($this->connection)) {
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throw new DibiDriverException("Can't connect to DB.");
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}
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if (isset($config['database']) && !@mssql_select_db($config['database'], $this->connection)) { // intentionally @
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throw new DibiDriverException("Can't select DB '$config[database]'.");
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}
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}
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/**
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* Disconnects from a database.
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* @return void
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*/
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public function disconnect()
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{
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mssql_close($this->connection);
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}
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/**
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* Executes the SQL query.
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* @param string SQL statement.
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* @return IDibiDriver|NULL
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* @throws DibiDriverException
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*/
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public function query($sql)
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{
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$this->resultSet = @mssql_query($sql, $this->connection); // intentionally @
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if ($this->resultSet === FALSE) {
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throw new DibiDriverException('Query error', 0, $sql);
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}
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return is_resource($this->resultSet) ? clone $this : NULL;
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}
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/**
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* Gets the number of affected rows by the last INSERT, UPDATE or DELETE query.
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* @return int|FALSE number of rows or FALSE on error
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*/
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public function affectedRows()
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{
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return mssql_rows_affected($this->connection);
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}
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/**
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* Retrieves the ID generated for an AUTO_INCREMENT column by the previous INSERT query.
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* @return int|FALSE int on success or FALSE on failure
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*/
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public function insertId($sequence)
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{
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throw new NotSupportedException('MS SQL does not support autoincrementing.');
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}
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/**
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* Begins a transaction (if supported).
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* @return void
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* @throws DibiDriverException
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*/
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public function begin()
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{
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$this->query('BEGIN TRANSACTION');
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}
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/**
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* Commits statements in a transaction.
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* @return void
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* @throws DibiDriverException
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*/
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public function commit()
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{
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$this->query('COMMIT');
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}
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/**
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* Rollback changes in a transaction.
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* @return void
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* @throws DibiDriverException
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*/
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public function rollback()
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{
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$this->query('ROLLBACK');
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}
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/**
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* Returns the connection resource.
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* @return mixed
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*/
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public function getResource()
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{
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return $this->connection;
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}
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/********************* SQL ****************d*g**/
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/**
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* Encodes data for use in an SQL statement.
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* @param string value
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* @param string type (dibi::FIELD_TEXT, dibi::FIELD_BOOL, ...)
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* @return string encoded value
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* @throws InvalidArgumentException
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*/
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public function escape($value, $type)
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{
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switch ($type) {
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case dibi::FIELD_TEXT:
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case dibi::FIELD_BINARY:
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return "'" . str_replace("'", "''", $value) . "'";
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case dibi::IDENTIFIER:
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// @see http://msdn.microsoft.com/en-us/library/ms176027.aspx
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$value = str_replace(array('[', ']'), array('[[', ']]'), $value);
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return '[' . str_replace('.', '].[', $value) . ']';
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case dibi::FIELD_BOOL:
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return $value ? -1 : 0;
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case dibi::FIELD_DATE:
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return date("'Y-m-d'", $value);
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case dibi::FIELD_DATETIME:
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return date("'Y-m-d H:i:s'", $value);
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default:
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throw new InvalidArgumentException('Unsupported type.');
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}
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}
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/**
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* Decodes data from result set.
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* @param string value
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* @param string type (dibi::FIELD_BINARY)
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* @return string decoded value
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* @throws InvalidArgumentException
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*/
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public function unescape($value, $type)
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{
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throw new InvalidArgumentException('Unsupported type.');
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}
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/**
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* Injects LIMIT/OFFSET to the SQL query.
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* @param string &$sql The SQL query that will be modified.
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* @param int $limit
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* @param int $offset
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* @return void
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*/
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public function applyLimit(&$sql, $limit, $offset)
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{
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// offset suppot is missing...
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if ($limit >= 0) {
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$sql = 'SELECT TOP ' . (int) $limit . ' * FROM (' . $sql . ')';
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}
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if ($offset) {
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throw new NotImplementedException('Offset is not implemented.');
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}
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}
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/********************* result set ****************d*g**/
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/**
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* Returns the number of rows in a result set.
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* @return int
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*/
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public function rowCount()
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{
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return mssql_num_rows($this->resultSet);
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}
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/**
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* Fetches the row at current position and moves the internal cursor to the next position.
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* @param bool TRUE for associative array, FALSE for numeric
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* @return array array on success, nonarray if no next record
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* @internal
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*/
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public function fetch($assoc)
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{
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return mssql_fetch_array($this->resultSet, $assoc ? MSSQL_ASSOC : MSSQL_NUM);
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}
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/**
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* Moves cursor position without fetching row.
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* @param int the 0-based cursor pos to seek to
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* @return boolean TRUE on success, FALSE if unable to seek to specified record
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* @throws DibiException
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*/
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public function seek($row)
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{
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return mssql_data_seek($this->resultSet, $row);
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}
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/**
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* Frees the resources allocated for this result set.
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* @return void
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*/
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public function free()
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{
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mssql_free_result($this->resultSet);
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$this->resultSet = NULL;
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}
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/**
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* Returns metadata for all columns in a result set.
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* @return array
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*/
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public function getColumnsMeta()
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{
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$count = mssql_num_fields($this->resultSet);
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$res = array();
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for ($i = 0; $i < $count; $i++) {
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$row = (array) mssql_fetch_field($this->resultSet, $i);
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$res[] = array(
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'name' => $row['name'],
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'fullname' => $row['column_source'] ? $row['column_source'] . '.' . $row['name'] : $row['name'],
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'table' => $row['column_source'],
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'nativetype' => $row['type'],
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);
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}
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return $res;
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}
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/**
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* Returns the result set resource.
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* @return mixed
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*/
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public function getResultResource()
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{
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return $this->resultSet;
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}
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/********************* reflection ****************d*g**/
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/**
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* Returns list of tables.
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* @return array
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*/
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public function getTables()
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{
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throw new NotImplementedException;
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}
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/**
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* Returns metadata for all columns in a table.
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* @param string
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* @return array
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*/
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public function getColumns($table)
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{
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throw new NotImplementedException;
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}
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/**
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* Returns metadata for all indexes in a table.
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* @param string
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* @return array
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*/
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public function getIndexes($table)
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{
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throw new NotImplementedException;
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}
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/**
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* Returns metadata for all foreign keys in a table.
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* @param string
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* @return array
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*/
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public function getForeignKeys($table)
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{
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throw new NotImplementedException;
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}
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}
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