808 Zeilen
23 KiB
PHP
808 Zeilen
23 KiB
PHP
<?php
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/**
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* Project:
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* Contenido Content Management System
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*
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* Description:
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* Base (abstract) database class. Each database driver file should extend this!
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* @todo Better error handling, use exceptions!
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*
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* Requirements:
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* @con_php_req 5
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*
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*
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* @package Contenido Database
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* @version 0.1.2
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* @author Murat Purc <murat@purc.de>
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* @copyright four for business AG <www.4fb.de>
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* @license http://www.contenido.org/license/LIZENZ.txt
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* @link http://www.4fb.de
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* @link http://www.contenido.org
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* @since file available since Contenido release 4.8.15
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*
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* {@internal
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* created 2011-03-03
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* modified 2011-03-13, Murat Purc, Added FETCH_* constants, extended toArray(),
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* moved close(), table_names() and server_info()
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* from child implementations.
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*
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* $Id$:
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* }}
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*
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*/
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if (!defined('CON_FRAMEWORK')) {
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die('Illegal call');
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}
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abstract class DB_Sql_Abstract {
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const HALT_YES = 'yes';
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const HALT_NO = 'no';
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const HALT_REPORT = 'report';
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const FETCH_NUMERIC = 'numeric';
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const FETCH_ASSOC = 'assoc';
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const FETCH_BOTH = 'both';
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/**
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* Assoziative list of database connections
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* @array
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*/
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protected static $_connectionCache = array();
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/**
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* Assoziative list of database tables metadata
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* @array
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*/
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protected static $_metaCache = array();
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/**
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* Sequence table name
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* @var string
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*/
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public $Seq_Table = '';
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/**
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* Flag to print debug messages
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* @var bool
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*/
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public $Debug = false;
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/**
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* Database name
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* @var string
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*/
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public $Database = '';
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/**
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* Database connection user name
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* @var string
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*/
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public $User = '';
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/**
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* Database connection password
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* @var string
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*/
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public $Password = '';
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/**
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* Database connection resource
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* @var resource|int
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*/
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public $Link_ID = 0;
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/**
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* Resource identifier of last executed query
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* @var resource
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*/
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public $Query_ID = 0;
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/**
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* Recordset data array. Could contain either indexed or assoziative result set (or both)
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* @var array
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*/
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public $Record = array();
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/**
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* The row position inside last executed select result
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* @var int
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*/
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public $Row;
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/**
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* Database error number
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* @var int
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*/
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public $Errno = 0;
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/**
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* Database error message
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* @var string
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*/
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public $Error = '';
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/**
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* Flag to automatic free results
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* @var int
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*/
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public $Auto_Free = 0;
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/**
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* Database identification string.
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* @var string
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*/
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public $type = '';
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/**
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* Revision. This is an api revision, not a CVS revision
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* @var string
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*/
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public $revision = '1.3';
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/**
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* Halt status during occured errors. Feasible values are
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* - "yes" (halt with message)
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* - "no" (ignore errors quietly)
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* - "report" (ignore errror, but spit a warning)
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* @var string
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*/
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public $Halt_On_Error = 'no';
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/**
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* Text to prepend to the halt message
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* @var string
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*/
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protected $_sHaltMsgPrefix = '';
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/**
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* Default database connection for all instances
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* @var array
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*/
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protected static $_aDefaultDbCfg = array();
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/**
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* Database connection configuration for current instance
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* @var array
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*/
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protected $_aDbCfg;
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/**
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* Enable profiling
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* @var bool
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*/
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protected $_bProfile = false;
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/**
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* Don't lock tables
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* @var bool
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*/
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protected $_bNolock = false;
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/**
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* Profile data array
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* @var array
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*/
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protected static $_aProfileData = array();
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// @todo intended to map new protected properties against old public
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// properties by using magic __call method
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protected $_oldProperties = array(
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'Seq_Table' => '_sSeqTable',
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'Debug' => '_bDebug',
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'Database' => '_sDatabase',
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'User' => '_sUser',
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'Password' => '_sPassword',
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'Link_ID' => '_mLinkId',
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'Query_ID' => '_mQueryId',
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'Auto_Free' => '_iAutoFree',
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'type' => '_sType',
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'revision' => '_sRevision',
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'Halt_On_Error' => '_sHaltOnError',
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);
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/**
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* Constructor, sets passed options and connects to the DBMS, if not done before.
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*
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* Uses default connection settings, passed $options['db_connection'] settings
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* will overwrite connection settings for current instance.
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*
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* @param array $options Assoziative options as follows:
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* - $options['sequenceTable'] (string) Optional, the sequence table name
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* - $options['nolock'] (bool) Optional, not lock table
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* - $options['haltBehavior'] (string) Optional, halt behavior on occured errors
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* - $options['haltMsgPrefix'] (string) Optional, Text to prepend to the halt message
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* - $options['type'] (string) Database driver name
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* - $options['enableProfiling'] (bool) Optional, flag to enable profiling
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* - $options['connection'] (array) Optional, assoziative connection settings
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* @return void
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*/
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protected function __construct(array $options) {
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// use default connection configuration, but overwrite it by passed options
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$this->_aDbCfg = array_merge(self::$_aDefaultDbCfg, $options);
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if (isset($this->_aDbCfg['sequenceTable']) && is_string($this->_aDbCfg['sequenceTable'])) {
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$this->Seq_Table = $this->_aDbCfg['sequenceTable'];
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}
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if (isset($this->_aDbCfg['haltBehavior'])) {
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switch ($this->_aDbCfg['haltBehavior']) {
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case self::HALT_YES:
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$this->Halt_On_Error = self::HALT_YES;
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break;
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case self::HALT_NO:
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$this->Halt_On_Error = self::HALT_NO;
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break;
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case self::HALT_REPORT:
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$this->Halt_On_Error = self::HALT_REPORT;
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break;
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}
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}
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if (isset($this->_aDbCfg['haltMsgPrefix']) && is_string($this->_aDbCfg['haltMsgPrefix'])) {
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$this->_sHaltMsgPrefix = $this->_aDbCfg['haltMsgPrefix'];
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}
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if (isset($this->_aDbCfg['type']) && is_string($this->_aDbCfg['type'])) {
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$this->type = $this->_aDbCfg['type'];
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}
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if (isset($this->_aDbCfg['nolock']) && is_bool($this->_aDbCfg['nolock'])) {
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$this->_bNolock = (bool) $this->_aDbCfg['nolock'];
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}
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if (isset($this->_aDbCfg['enableProfiling']) && is_bool($this->_aDbCfg['enableProfiling'])) {
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$this->_bProfile = (bool) $this->_aDbCfg['enableProfiling'];
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}
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$this->connect();
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}
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/**
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* Setter for default database configuration, the connection values.
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*
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* @param array $defaultDbCfg
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*/
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public static function setDefaultConfiguration(array $defaultDbCfg) {
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self::$_aDefaultDbCfg = $defaultDbCfg;
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}
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/**
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* Establishes a connection to the database server.
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*
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* @return object|resource|int|null Connection handler. Return value depends on
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* used driver and is null in case of an error.
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*/
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public function connect() {
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if ($this->Link_ID = $this->_getConnection($this->_aDbCfg['connection'])) {
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return $this->Link_ID;
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} else {
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if ($this->Link_ID = $this->_connect()) {
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$this->_setConnection($this->_aDbCfg['connection'], $this->Link_ID);
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return $this->Link_ID;
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}
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}
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return null;
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}
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/**
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* Resource id/object of current connection
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*
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* @return mixed The resource id/object of current connection
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*/
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public function link_id() {
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return $this->Link_ID;
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}
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/**
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* Returns connection from connection cache
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*
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* @param mixed $data Connection data array
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* @return mixed Either The connection (object, resource, integer) or null
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*/
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protected function _getConnection($data) {
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$hash = md5($this->type . '-' . (is_array($data) ? implode('-', $data) : (string) $data));
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return (isset(self::$_connectionCache[$hash])) ? self::$_connectionCache[$hash] : null;
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}
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/**
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* Stores connection in connection cache
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*
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* @param mixed $data Connection data array
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* @param mixed $connection The connection to store in cache
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* @return void
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*/
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protected function _setConnection($data, $connection) {
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$hash = md5($this->type . '-' . (is_array($data) ? implode('-', $data) : (string) $data));
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self::$_connectionCache[$hash] = $connection;
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}
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/**
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* Removes connection from cache
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*
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* @param mixed $connection The connection to remove in cache
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* @return void
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*/
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protected function _removeConnection($connection) {
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foreach (self::$_connectionCache as $hash => $res) {
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if ($res == $connection) {
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unset(self::$_connectionCache[$hash]);
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return;
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}
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}
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}
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/**
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* Returns the current cursor
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*
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* @return resource Current cursor
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*/
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public function query_id() {
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return $this->Query_ID;
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}
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/**
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* Connects to the database.
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*
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* @return object|resource|int|null Connection handler. Return value depends on
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* used driver and is null in case of an error.
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*/
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abstract protected function _connect();
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/**
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* Executes the query.
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*
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* @param string $sQuery The query to execute.
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* @param mixed Accepts additional unlimited parameter, where the parameter
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* will be replaced against format definitions in query.
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* @return resource|int|object|bool Depends on used database driver, false on error
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*/
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public function query($sQuery) {
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// No empty queries, please, since PHP4 chokes on them
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if ($sQuery == '') {
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// The empty query string is passed on from the constructor, when calling
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// the class without a query, e.g. in situations '$db = new DB_Sql_Subclass;'
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return false;
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}
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$aArgs = func_get_args();
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if (count($aArgs) > 1) {
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array_shift($aArgs);
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$sQuery = $this->_prepareQueryf($sQuery, $aArgs);
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}
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if (!$this->connect()) {
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return false;
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}
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// new query, discard previous result
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if ($this->Query_ID) {
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$this->free();
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}
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$this->_debug('Debug: query = ' . $sQuery);
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if ($this->_bProfile) {
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$fStart = microtime(true);
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}
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$this->_query($sQuery);
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if ($this->_bProfile) {
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$fEnd = microtime(true);
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$this->_addProfileData($fStart, $fEnd, $sQuery);
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}
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// Will return nada if it fails. That's fine.
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return $this->Query_ID;
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}
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/**
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* Executes the query.
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*
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* @param string $sQuery The query to execute
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* @return void
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*/
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abstract protected function _query($sQuery);
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/**
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* Prepares a query with parameter for execution.
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*
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* @param string $sQuery
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* @param array $aArgs Arguments array containing the query with formatting
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* signs and the entries.
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* Examples:
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* <pre>
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* $obj->_prepareQueryf('SELECT * FROM `%s` WHERE id = %d', 'tablename', 123);
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* $obj->_prepareQueryf('SELECT * FROM `%s` WHERE id = %d AND user = %d', 'tablename', 123, 3);
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* </pre>
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* @return string
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*/
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protected function _prepareQueryf($sQuery, array $aArgs) {
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if (count($aArgs) > 0) {
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$aArgs = array_map(array($this, 'escape'), $aArgs);
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array_unshift($aArgs, $sQuery);
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$sQuery = call_user_func_array('sprintf', $aArgs);
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}
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return $sQuery;
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}
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/**
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* Moves the result to the next record, if exists and returns the status of the movement
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*
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* @return int Flag about move status 1 on success or 0
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*/
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abstract public function next_record();
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/**
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* Moves the cursor (position inside current result sets).
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*
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* @param int $pos The positon to move to inside the current result set
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* @return void
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*/
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abstract public function seek($pos = 0);
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/**
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* Locks the desired table.
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*
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* @param string $table The table to lock
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* @param string $mode The lock mode. Only mode 'write' is supported!
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* @return int Status of lock success (1 or 0)
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*/
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abstract public function lock($table, $mode = 'write');
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/**
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* Frees a previous locked result.
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*
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* @return int Status of lock success (1 or 0)
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*/
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abstract public function unlock();
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/**
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* Parses te table structure and generates a metadata from it.
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*
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* @param string $table The table to get metadata or empty string to retrieve
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* metadata of all tables
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* @param bool $full Flag to load full metada
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* @return array Depends on used database and on parameter $full
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*/
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public function metadata($table = '', $full = false) {
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$key = (string) $this->Database . '_' . $table . '_' . (($full) ? '1' : '0');
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if (!isset(self::$_metaCache[$key])) {
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// get meta data
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self::$_metaCache[$key] = $this->_metaData($table, $full);
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}
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return self::$_metaCache[$key];
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}
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/**
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* Parses te table structure and generates a metadata from it.
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*
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* @param string $table The table to get metadata or empty string to retrieve
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* metadata of all tables
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* @param bool $full Flag to load full metada
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* @return array Depends on used database and on parameter $full
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*/
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abstract protected function _metaData($table = '', $full = false);
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/**
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* Returns number of affected rows from last executed query (update, delete)
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*
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* @return int Number of affected rows
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*/
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abstract public function affected_rows();
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/**
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* Returns the number of rows from last executed select query.
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*
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* @return int The number of rows from last select query result
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*/
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abstract public function num_rows();
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/**
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* Returns the number of fields (colums) from current record set
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*
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* @return int Number of fields
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*/
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abstract public function num_fields();
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/**
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* Returns the number of rows (record set).
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* Shortcut for function num_rows().
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*
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* @return int Number of rows
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*/
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public function nf() {
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return $this->num_rows();
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}
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/**
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* Displays the number of rows (record set) using print.
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*
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* @return void
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*/
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public function np() {
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print $this->num_rows();
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}
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/**
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* Returns the desired field value from current record set.
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*
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* @param mixed The field name or index position
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* @param mixed The default value to return
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* @return mixed The value of field
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*/
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public function f($Name, $default = null) {
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return (isset($this->Record[$Name])) ? $this->Record[$Name] : $default;
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}
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/**
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* Displays the desired field value from current record set using print.
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*
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* @param mixed The field name or index position
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* @return void
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*/
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public function p($Name) {
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if (isset($this->Record[$Name])) {
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print $this->Record[$Name];
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}
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}
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/**
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* Returns current recordset as a assoziative and/or indexed array.
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*
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* @param string $fetchMode One of DB_SQL_Abstract::FETCH_* constants
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* @return array
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*/
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public function toArray($fetchMode = DB_SQL_Abstract::FETCH_ASSOC) {
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switch ($fetchMode) {
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case self::FETCH_NUMERIC:
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case self::FETCH_ASSOC:
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case self::FETCH_BOTH:
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// donut
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break;
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default:
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$fetchMode = DB_SQL_Abstract::FETCH_ASSOC;
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break;
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}
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$aResult = array();
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if (is_array($this->Record)) {
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foreach ($this->Record as $key => $value) {
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if ($fetchMode == self::FETCH_ASSOC && !is_numeric($key)) {
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$aResult[$key] = $value;
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} elseif ($fetchMode == self::FETCH_NUMERIC && is_numeric($key)) {
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$aResult[$key] = $value;
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} else {
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$aResult[$key] = $value;
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}
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}
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}
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return $aResult;
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}
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/**
|
|
* Returns current recordset as a object
|
|
*
|
|
* @return stdClass
|
|
*/
|
|
public function toObject() {
|
|
return (object) $this->toArray(self::FETCH_ASSOC);
|
|
}
|
|
|
|
/**
|
|
* Returns the next id (sequence number).
|
|
*
|
|
* @param string $seq_name The sequence name to get the next id from
|
|
* @return int The next id or 0 on error
|
|
*/
|
|
abstract public function nextid($seq_name);
|
|
|
|
/**
|
|
* Wrapper method for disconnect()
|
|
* @see DB_Sql_Abstract::disconnect()
|
|
*/
|
|
public function close() {
|
|
$this->disconnect();
|
|
}
|
|
|
|
/**
|
|
* Closes the connection and frees the query id.
|
|
*
|
|
* @return void
|
|
*/
|
|
abstract public function disconnect();
|
|
|
|
/**
|
|
* Error handling
|
|
*
|
|
* Error handler function, delegates passed message to the function haltmsg() if propery
|
|
* $this->Halt_On_Error is not set to self::HALT_REPORT.
|
|
*
|
|
* Terminates further script execution if $this->Halt_On_Error is set to self::HALT_YES
|
|
*
|
|
* @param string $sMsg The message to use for error handling
|
|
* @return void
|
|
*/
|
|
public function halt($sMsg) {
|
|
if ($this->Halt_On_Error == self::HALT_REPORT) {
|
|
$this->haltmsg($this->_sHaltMsgPrefix . $sMsg);
|
|
}
|
|
|
|
if ($this->Halt_On_Error == self::HALT_YES) {
|
|
die('Session halted.');
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Logs passed message, basically the last db error to the error log.
|
|
* Concatenates a detailed error message and invokey PHP's error_log() method.
|
|
*
|
|
* @param string $sMsg
|
|
* @return void
|
|
*/
|
|
public function haltmsg($sMsg) {
|
|
$sName = 'ConLite DB';
|
|
if (!$this->Error) {
|
|
$this->Error = $this->_getErrorMessage();
|
|
}
|
|
if (!$this->Errno) {
|
|
$this->Errno = $this->_getErrorNumber();
|
|
}
|
|
|
|
$sMsg = sprintf("%s error: %s (%s) - info: %s\n", $sName, $this->Errno, $this->Error, $sMsg);
|
|
error_log($sMsg);
|
|
}
|
|
|
|
/**
|
|
* Returns names of existing tables.
|
|
*
|
|
* @return array|null Indexed array containing assoziative table data as
|
|
* follows or null:
|
|
* - $info[$i]['table_name']
|
|
* - $info[$i]['tablespace_name']
|
|
* - $info[$i]['database']
|
|
*/
|
|
public function table_names() {
|
|
if (!$this->connect()) {
|
|
return null;
|
|
}
|
|
if (method_exists($this, '_tableNames')) {
|
|
return $this->_tableNames();
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Implemetation for table_names() in child classes
|
|
* @see DB_Sql_Abstract::table_names()
|
|
*/
|
|
abstract protected function _tableNames();
|
|
|
|
/**
|
|
* Escape string for using in SQL-Statement.
|
|
*
|
|
* @param string $sString The string to escape
|
|
* @return string Escaped string
|
|
*/
|
|
abstract public function escape($sString);
|
|
|
|
/**
|
|
* Returns information about DB server. The return value depends allways on
|
|
* used DBMS.
|
|
*
|
|
* @return array|null Assoziative array as follows or null:
|
|
* - $arr['description'] (string) Optional, server description
|
|
* - $arr['version'] (string) Optional, server version
|
|
*/
|
|
public function server_info() {
|
|
if (!$this->connect()) {
|
|
return null;
|
|
}
|
|
if (method_exists($this, '_serverInfo')) {
|
|
return $this->_serverInfo();
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Implemetation for server_info() in child classes.
|
|
* @see DB_Sql_Abstract::server_info()
|
|
*/
|
|
abstract protected function _serverInfo();
|
|
|
|
/**
|
|
* Returns error message of last occured error.
|
|
*
|
|
* @return string
|
|
*/
|
|
public function getErrorMessage() {
|
|
return $this->Error;
|
|
}
|
|
|
|
/**
|
|
* Returns error message of last occured error by using databases interface.
|
|
*
|
|
* @return string
|
|
*/
|
|
abstract protected function _getErrorMessage();
|
|
|
|
/**
|
|
* Returns error code of last occured error by using databases interface.
|
|
*
|
|
* @return int
|
|
*/
|
|
public function getErrorNumber() {
|
|
return $this->Errno;
|
|
}
|
|
|
|
/**
|
|
* Returns error code of last occured error by using databases interface.
|
|
*
|
|
* @return int
|
|
*/
|
|
abstract protected function _getErrorNumber();
|
|
|
|
/**
|
|
* Adds a entry to the profile data.
|
|
*
|
|
* @param float $fStartTime
|
|
* @param float $fEndTime
|
|
* @param string $sQuery
|
|
* @return void
|
|
*/
|
|
protected static function _addProfileData($fStartTime, $fEndTime, $sQuery) {
|
|
self::$_aProfileData[] = array(
|
|
'time' => $fEndTime - $fStartTime,
|
|
'query' => $sQuery
|
|
/*,
|
|
'ErrNo' => static::_getErrorNumber(),
|
|
'ErrMess' => static::_getErrorMessage()*/
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Returns collected profile data.
|
|
*
|
|
* @return array Profile data array like:
|
|
* - $arr[$i]['time'] (float) Elapsed time to execute the query
|
|
* - $arr[$i]['query'] (string) The query itself
|
|
*/
|
|
public static function getProfileData() {
|
|
return self::$_aProfileData;
|
|
}
|
|
|
|
/**
|
|
* Displays the passed message, if debug is enabled (see $this->Debug)
|
|
*
|
|
* @param string $sMsg The message to display
|
|
* @return void
|
|
*/
|
|
protected function _debug($sMsg) {
|
|
if ($this->Debug) {
|
|
printf("<pre>" . $sMsg . "</pre>\n");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* returns info about db-server
|
|
*
|
|
* return string
|
|
*/
|
|
abstract public function getServerInfo();
|
|
|
|
/**
|
|
* returns client encoding
|
|
*
|
|
* return string
|
|
*/
|
|
abstract public function getClientEncoding();
|
|
|
|
/**
|
|
* returns client info
|
|
*
|
|
* return string
|
|
*/
|
|
abstract public function getClientInfo();
|
|
}
|