mirror of
https://github.com/dg/dibi.git
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359 lines
8.7 KiB
PHP
359 lines
8.7 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 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://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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*/
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/**
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* The dibi driver for Oracle database
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*
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* Connection options:
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* - 'database' (or 'db') - the name of the local Oracle instance or the name of the entry in tnsnames.ora
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* - 'username' (or 'user')
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* - 'password' (or 'pass')
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* - 'charset' - character encoding to set
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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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* @version $Revision$ $Date$
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*/
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class DibiOracleDriver extends NObject implements IDibiDriver
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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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* @var bool
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*/
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private $autocommit = TRUE;
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/**
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* @throws DibiException
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*/
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public function __construct()
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{
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if (!extension_loaded('oci8')) {
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throw new DibiDriverException("PHP extension 'oci8' is not loaded");
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}
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}
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/**
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* Connects to a database
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*
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* @return void
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* @throws DibiException
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*/
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public function connect(array &$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($config, 'database', 'db');
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DibiConnection::alias($config, 'charset');
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$this->connection = @oci_new_connect($config['username'], $config['password'], $config['database'], $config['charset']);
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if (!$this->connection) {
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$err = oci_error();
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throw new DibiDriverException($err['message'], $err['code']);
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}
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}
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/**
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* Disconnects from a database
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*
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* @return void
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*/
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public function disconnect()
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{
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oci_close($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 DibiDriverException
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*/
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public function query($sql)
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{
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$this->resultset = oci_parse($this->connection, $sql);
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if ($this->resultset) {
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oci_execute($this->resultset, $this->autocommit ? OCI_COMMIT_ON_SUCCESS : OCI_DEFAULT);
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$err = oci_error($this->resultset);
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if ($err) {
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throw new DibiDriverException($err['message'], $err['code'], $sql);
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}
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} else {
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$this->throwException($sql);
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}
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return is_resource($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|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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throw new BadMethodCallException(__METHOD__ . ' is not implemented');
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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($sequence)
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{
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throw new BadMethodCallException(__METHOD__ . ' is not implemented');
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}
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/**
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* Begins a transaction (if supported).
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* @return void
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* @throws DibiDriverException
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*/
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public function begin()
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{
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$this->autocommit = FALSE;
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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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if (!oci_commit($this->connection)) {
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$this->throwException();
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}
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$this->autocommit = TRUE;
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}
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/**
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* Rollback changes in a transaction.
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* @return void
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* @throws DibiDriverException
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*/
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public function rollback()
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{
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if (!oci_rollback($this->connection)) {
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$this->throwException();
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}
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$this->autocommit = 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("'", "''", $value) . "'"; // TODO: not tested
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if ($type === dibi::IDENTIFIER) return '[' . str_replace('.', '].[', $value) . ']'; // TODO: not tested
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if ($type === dibi::FIELD_BOOL) return $value ? 1 : 0;
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if ($type === dibi::FIELD_DATE) return date("U", $value);
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if ($type === dibi::FIELD_DATETIME) return date("U", $value);
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throw new InvalidArgumentException('Unsupported formatting type');
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}
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/**
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* Injects LIMIT/OFFSET to the SQL query
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*
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* @param string &$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, $offset)
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{
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if ($limit < 0 && $offset < 1) return;
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$sql .= ' LIMIT ' . $limit . ($offset > 0 ? ' OFFSET ' . (int) $offset : '');
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}
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/**
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* Returns the number of rows in a result set
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*
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* @return int
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*/
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public function rowCount()
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{
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return oci_num_rows($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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* @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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*/
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public function fetch($type)
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{
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return oci_fetch_array($this->resultset, ($type ? OCI_ASSOC : OCI_NUM) | OCI_RETURN_NULLS);
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}
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/**
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* Moves cursor position without fetching row
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*
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* @param int the 0-based cursor pos to seek to
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* @return boolean TRUE on success, FALSE if unable to seek to specified record
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* @throws DibiException
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*/
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public function seek($row)
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{
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throw new BadMethodCallException(__METHOD__ . ' is not implemented');
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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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oci_free_statement($this->resultset);
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$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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*
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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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$count = oci_num_fields($this->resultset);
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$meta = array();
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for ($i = 1; $i <= $count; $i++) {
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// items 'name' and 'table' are required
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$meta[] = array(
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'name' => oci_field_name($this->resultset, $i),
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'table' => NULL,
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'type' => oci_field_type($this->resultset, $i),
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'size' => oci_field_size($this->resultset, $i),
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'scale' => oci_field_scale($this->resultset, $i),
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'precision' => oci_field_precision($this->resultset, $i),
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);
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}
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return $meta;
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}
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/**
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* Converts database error to DibiDriverException
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*
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* @throws DibiDriverException
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*/
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protected function throwException($sql = NULL)
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{
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$err = oci_error($this->connection);
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throw new DibiDriverException($err['message'], $err['code'], $sql);
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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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