mirror of
https://github.com/dg/dibi.git
synced 2025-02-24 19:02:36 +01:00
365 lines
9.6 KiB
PHP
365 lines
9.6 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, 2007 David Grudl aka -dgx- (http://www.dgx.cz)
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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://php7.org/dibi/
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*
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* @copyright Copyright (c) 2005, 2007 David Grudl
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* @license http://php7.org/dibi/license dibi license
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* @link http://php7.org/dibi/
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* @package dibi
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*/
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/**
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* The dibi driver interacting with databases via ODBC connections
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*
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* Connection options:
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* - 'dsn' - driver specific DSN
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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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* - '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, 2007 David Grudl
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* @package dibi
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* @version $Revision$ $Date$
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*/
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class DibiOdbcDriver extends NObject implements DibiDriverInterface
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{
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/**
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* Connection resource
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* @var resource
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*/
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private $connection;
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/**
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* Resultset resource
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* @var resource
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*/
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private $resultset;
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/**
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* Cursor
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* @var int
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*/
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private $row = 0;
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/**
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* Connects to a database
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*
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* @return void
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* @throws DibiException
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*/
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public function connect(array &$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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// default values
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if (!isset($config['username'])) $config['username'] = ini_get('odbc.default_user');
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if (!isset($config['password'])) $config['password'] = ini_get('odbc.default_pw');
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if (!isset($config['dsn'])) $config['dsn'] = ini_get('odbc.default_db');
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if (!extension_loaded('odbc')) {
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throw new DibiException("PHP extension 'odbc' is not loaded");
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}
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if (empty($config['persistent'])) {
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$this->connection = @odbc_connect($config['dsn'], $config['username'], $config['password']);
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} else {
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$this->connection = @odbc_pconnect($config['dsn'], $config['username'], $config['password']);
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}
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if (!is_resource($this->connection)) {
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throw new DibiDatabaseException(odbc_errormsg() . ' ' . odbc_error());
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}
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}
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/**
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* Disconnects from a database
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*
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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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odbc_close($this->connection);
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}
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/**
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* Executes the SQL query
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*
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* @param string SQL statement.
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* @return bool have resultset?
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* @throws DibiDatabaseException
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*/
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public function query($sql)
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{
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$this->resultset = @odbc_exec($this->connection, $sql);
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if ($this->resultset === FALSE) {
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throw new DibiDatabaseException(odbc_errormsg($this->connection) . ' ' . odbc_error($this->connection), 0, $sql);
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}
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return is_resource($this->resultset);
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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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*
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* @return int 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 odbc_num_rows($this->resultset);
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}
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/**
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* Retrieves the ID generated for an AUTO_INCREMENT column by the previous INSERT query
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*
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* @return int|FALSE int on success or FALSE on failure
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*/
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public function insertId($sequence)
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{
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throw new BadMethodCallException(__METHOD__ . ' is not implemented');
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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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*/
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public function begin()
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{
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if (!odbc_autocommit($this->connection, FALSE)) {
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throw new DibiDatabaseException(odbc_errormsg($this->connection) . ' ' . odbc_error($this->connection));
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}
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}
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/**
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* Commits statements in a transaction.
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* @return void
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*/
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public function commit()
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{
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if (!odbc_commit($this->connection)) {
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throw new DibiDatabaseException(odbc_errormsg($this->connection) . ' ' . odbc_error($this->connection));
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}
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odbc_autocommit($this->connection, TRUE);
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}
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/**
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* Rollback changes in a transaction.
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* @return void
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*/
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public function rollback()
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{
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if (!odbc_rollback($this->connection)) {
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throw new DibiDatabaseException(odbc_errormsg($this->connection) . ' ' . odbc_error($this->connection));
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}
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odbc_autocommit($this->connection, TRUE);
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}
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/**
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* Format to SQL command
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*
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* @param string value
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* @param string type (dibi::FIELD_TEXT, dibi::FIELD_BOOL, dibi::FIELD_DATE, dibi::FIELD_DATETIME, dibi::IDENTIFIER)
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* @return string formatted value
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* @throws InvalidArgumentException
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*/
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public function format($value, $type)
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{
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if ($type === dibi::FIELD_TEXT) return "'" . str_replace("'", "''", $value) . "'";
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if ($type === dibi::IDENTIFIER) return '[' . str_replace('.', '].[', $value) . ']';
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if ($type === dibi::FIELD_BOOL) return $value ? -1 : 0;
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if ($type === dibi::FIELD_DATE) return date("#m/d/Y#", $value);
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if ($type === dibi::FIELD_DATETIME) return date("#m/d/Y H:i:s#", $value);
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throw new InvalidArgumentException('Unsupported formatting type');
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}
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/**
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* Injects LIMIT/OFFSET to the SQL query
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*
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* @param string &$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) throw new InvalidArgumentException('Offset is not implemented in driver odbc');
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}
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/**
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* Returns the number of rows in a result set
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*
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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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// will return -1 with many drivers :-(
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return odbc_num_rows($this->resultset);
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}
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/**
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* Fetches the row at current position and moves the internal cursor to the next position
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* internal usage only
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*
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* @return array|FALSE array on success, FALSE if no next record
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*/
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public function fetch()
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{
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return odbc_fetch_array($this->resultset, ++$this->row);
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}
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/**
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* Moves cursor position without fetching row
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*
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* @param int the 0-based cursor pos to seek to
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* @return boolean TRUE on success, FALSE if unable to seek to specified record
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* @throws DibiException
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*/
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public function seek($row)
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{
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$this->row = $row;
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return TRUE;
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}
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/**
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* Frees the resources allocated for this result set
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*
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* @return void
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*/
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public function free()
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{
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odbc_free_result($this->resultset);
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}
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/** this is experimental */
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public function buildMeta()
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{
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static $types = array(
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'CHAR' => dibi::FIELD_TEXT,
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'COUNTER' => dibi::FIELD_COUNTER,
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'VARCHAR' => dibi::FIELD_TEXT,
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'LONGCHAR' => dibi::FIELD_TEXT,
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'INTEGER' => dibi::FIELD_INTEGER,
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'DATETIME' => dibi::FIELD_DATETIME,
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'CURRENCY' => dibi::FIELD_FLOAT,
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'BIT' => dibi::FIELD_BOOL,
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'LONGBINARY'=> dibi::FIELD_BINARY,
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'SMALLINT' => dibi::FIELD_INTEGER,
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'BYTE' => dibi::FIELD_INTEGER,
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'BIGINT' => dibi::FIELD_INTEGER,
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'INT' => dibi::FIELD_INTEGER,
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'TINYINT' => dibi::FIELD_INTEGER,
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'REAL' => dibi::FIELD_FLOAT,
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'DOUBLE' => dibi::FIELD_FLOAT,
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'DECIMAL' => dibi::FIELD_FLOAT,
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'NUMERIC' => dibi::FIELD_FLOAT,
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'MONEY' => dibi::FIELD_FLOAT,
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'SMALLMONEY'=> dibi::FIELD_FLOAT,
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'FLOAT' => dibi::FIELD_FLOAT,
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'YESNO' => dibi::FIELD_BOOL,
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// and many others?
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);
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$count = odbc_num_fields($this->resultset);
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$meta = array();
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for ($index = 1; $index <= $count; $index++) {
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$native = strtoupper(odbc_field_type($this->resultset, $index));
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$name = odbc_field_name($this->resultset, $index);
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$meta[$name] = array(
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'type' => isset($types[$native]) ? $types[$native] : dibi::FIELD_UNKNOWN,
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'native' => $native,
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'length' => odbc_field_len($this->resultset, $index),
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'scale' => odbc_field_scale($this->resultset, $index),
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'precision' => odbc_field_precision($this->resultset, $index),
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);
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}
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return $meta;
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}
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/**
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* Returns the connection resource
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*
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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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/**
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* Returns the resultset resource
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*
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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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/**
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* Gets a information of the current database.
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*
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* @return DibiReflection
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*/
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function getDibiReflection()
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{}
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}
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