Blame | Last modification | View Log | RSS feed
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');/*** CodeIgniter** An open source application development framework for PHP 4.3.2 or newer** @package CodeIgniter* @author ExpressionEngine Dev Team* @copyright Copyright (c) 2008, EllisLab, Inc.* @license http://codeigniter.com/user_guide/license.html* @link http://codeigniter.com* @since Version 1.0* @filesource*/// ------------------------------------------------------------------------/*** MySQL Database Adapter Class** Note: _DB is an extender class that the app controller* creates dynamically based on whether the active record* class is being used or not.** @package CodeIgniter* @subpackage Drivers* @category Database* @author ExpressionEngine Dev Team* @link http://codeigniter.com/user_guide/database/*/class CI_DB_mysql_driver extends CI_DB {var $dbdriver = 'mysql';// The character used for escapingvar $_escape_char = '`';/*** Whether to use the MySQL "delete hack" which allows the number* of affected rows to be shown. Uses a preg_replace when enabled,* adding a bit more processing to all queries.*/var $delete_hack = TRUE;/*** The syntax to count rows is slightly different across different* database engines, so this string appears in each driver and is* used for the count_all() and count_all_results() functions.*/var $_count_string = 'SELECT COUNT(*) AS ';var $_random_keyword = ' RAND()'; // database specific random keyword/*** Non-persistent database connection** @access private called by the base class* @return resource*/function db_connect(){if ($this->port != ''){$this->hostname .= ':'.$this->port;}return @mysql_connect($this->hostname, $this->username, $this->password, TRUE);}// --------------------------------------------------------------------/*** Persistent database connection** @access private called by the base class* @return resource*/function db_pconnect(){if ($this->port != ''){$this->hostname .= ':'.$this->port;}return @mysql_pconnect($this->hostname, $this->username, $this->password);}// --------------------------------------------------------------------/*** Select the database** @access private called by the base class* @return resource*/function db_select(){return @mysql_select_db($this->database, $this->conn_id);}// --------------------------------------------------------------------/*** Set client character set** @access public* @param string* @param string* @return resource*/function db_set_charset($charset, $collation){return @mysql_query("SET NAMES '".$this->escape_str($charset)."' COLLATE '".$this->escape_str($collation)."'", $this->conn_id);}// --------------------------------------------------------------------/*** Version number query string** @access public* @return string*/function _version(){return "SELECT version() AS ver";}// --------------------------------------------------------------------/*** Execute the query** @access private called by the base class* @param string an SQL query* @return resource*/function _execute($sql){$sql = $this->_prep_query($sql);return @mysql_query($sql, $this->conn_id);}// --------------------------------------------------------------------/*** Prep the query** If needed, each database adapter can prep the query string** @access private called by execute()* @param string an SQL query* @return string*/function _prep_query($sql){// "DELETE FROM TABLE" returns 0 affected rows This hack modifies// the query so that it returns the number of affected rowsif ($this->delete_hack === TRUE){if (preg_match('/^\s*DELETE\s+FROM\s+(\S+)\s*$/i', $sql)){$sql = preg_replace("/^\s*DELETE\s+FROM\s+(\S+)\s*$/", "DELETE FROM \\1 WHERE 1=1", $sql);}}return $sql;}// --------------------------------------------------------------------/*** Begin Transaction** @access public* @return bool*/function trans_begin($test_mode = FALSE){if ( ! $this->trans_enabled){return TRUE;}// When transactions are nested we only begin/commit/rollback the outermost onesif ($this->_trans_depth > 0){return TRUE;}// Reset the transaction failure flag.// If the $test_mode flag is set to TRUE transactions will be rolled back// even if the queries produce a successful result.$this->_trans_failure = ($test_mode === TRUE) ? TRUE : FALSE;$this->simple_query('SET AUTOCOMMIT=0');$this->simple_query('START TRANSACTION'); // can also be BEGIN or BEGIN WORKreturn TRUE;}// --------------------------------------------------------------------/*** Commit Transaction** @access public* @return bool*/function trans_commit(){if ( ! $this->trans_enabled){return TRUE;}// When transactions are nested we only begin/commit/rollback the outermost onesif ($this->_trans_depth > 0){return TRUE;}$this->simple_query('COMMIT');$this->simple_query('SET AUTOCOMMIT=1');return TRUE;}// --------------------------------------------------------------------/*** Rollback Transaction** @access public* @return bool*/function trans_rollback(){if ( ! $this->trans_enabled){return TRUE;}// When transactions are nested we only begin/commit/rollback the outermost onesif ($this->_trans_depth > 0){return TRUE;}$this->simple_query('ROLLBACK');$this->simple_query('SET AUTOCOMMIT=1');return TRUE;}// --------------------------------------------------------------------/*** Escape String** @access public* @param string* @return string*/function escape_str($str){if (is_array($str)){foreach($str as $key => $val){$str[$key] = $this->escape_str($val);}return $str;}if (function_exists('mysql_real_escape_string') AND is_resource($this->conn_id)){return mysql_real_escape_string($str, $this->conn_id);}elseif (function_exists('mysql_escape_string')){return mysql_escape_string($str);}else{return addslashes($str);}}// --------------------------------------------------------------------/*** Affected Rows** @access public* @return integer*/function affected_rows(){return @mysql_affected_rows($this->conn_id);}// --------------------------------------------------------------------/*** Insert ID** @access public* @return integer*/function insert_id(){return @mysql_insert_id($this->conn_id);}// --------------------------------------------------------------------/*** "Count All" query** Generates a platform-specific query string that counts all records in* the specified database** @access public* @param string* @return string*/function count_all($table = ''){if ($table == '')return '0';$query = $this->query($this->_count_string . $this->_protect_identifiers('numrows'). " FROM " . $this->_protect_identifiers($table, TRUE, NULL, FALSE));if ($query->num_rows() == 0)return '0';$row = $query->row();return (int)$row->numrows;}// --------------------------------------------------------------------/*** List table query** Generates a platform-specific query string so that the table names can be fetched** @access private* @param boolean* @return string*/function _list_tables($prefix_limit = FALSE){$sql = "SHOW TABLES FROM ".$this->_escape_char.$this->database.$this->_escape_char;if ($prefix_limit !== FALSE AND $this->dbprefix != ''){$sql .= " LIKE '".$this->dbprefix."%'";}return $sql;}// --------------------------------------------------------------------/*** Show column query** Generates a platform-specific query string so that the column names can be fetched** @access public* @param string the table name* @return string*/function _list_columns($table = ''){return "SHOW COLUMNS FROM ".$table;}// --------------------------------------------------------------------/*** Field data query** Generates a platform-specific query so that the column data can be retrieved** @access public* @param string the table name* @return object*/function _field_data($table){return "SELECT * FROM ".$table." LIMIT 1";}// --------------------------------------------------------------------/*** The error message string** @access private* @return string*/function _error_message(){return mysql_error($this->conn_id);}// --------------------------------------------------------------------/*** The error message number** @access private* @return integer*/function _error_number(){return mysql_errno($this->conn_id);}// --------------------------------------------------------------------/*** Escape the SQL Identifiers** This function escapes column and table names** @access private* @param string* @return string*/function _escape_identifiers($item){if ($this->_escape_char == ''){return $item;}if (strpos($item, '.') !== FALSE){$str = $this->_escape_char.str_replace('.', $this->_escape_char.'.'.$this->_escape_char, $item).$this->_escape_char;}else{$str = $this->_escape_char.$item.$this->_escape_char;}// remove duplicates if the user already included the escapereturn preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str);}// --------------------------------------------------------------------/*** From Tables** This function implicitly groups FROM tables so there is no confusion* about operator precedence in harmony with SQL standards** @access public* @param type* @return type*/function _from_tables($tables){if ( ! is_array($tables)){$tables = array($tables);}return '('.implode(', ', $tables).')';}// --------------------------------------------------------------------/*** Insert statement** Generates a platform-specific insert string from the supplied data** @access public* @param string the table name* @param array the insert keys* @param array the insert values* @return string*/function _insert($table, $keys, $values){return "INSERT INTO ".$table." (".implode(', ', $keys).") VALUES (".implode(', ', $values).")";}// --------------------------------------------------------------------/*** Update statement** Generates a platform-specific update string from the supplied data** @access public* @param string the table name* @param array the update data* @param array the where clause* @param array the orderby clause* @param array the limit clause* @return string*/function _update($table, $values, $where, $orderby = array(), $limit = FALSE){foreach($values as $key => $val){$valstr[] = $key." = ".$val;}$limit = ( ! $limit) ? '' : ' LIMIT '.$limit;$orderby = (count($orderby) >= 1)?' ORDER BY '.implode(", ", $orderby):'';$sql = "UPDATE ".$table." SET ".implode(', ', $valstr);$sql .= ($where != '' AND count($where) >=1) ? " WHERE ".implode(" ", $where) : '';$sql .= $orderby.$limit;return $sql;}// --------------------------------------------------------------------/*** Truncate statement** Generates a platform-specific truncate string from the supplied data* If the database does not support the truncate() command* This function maps to "DELETE FROM table"** @access public* @param string the table name* @return string*/function _truncate($table){return "TRUNCATE ".$table;}// --------------------------------------------------------------------/*** Delete statement** Generates a platform-specific delete string from the supplied data** @access public* @param string the table name* @param array the where clause* @param string the limit clause* @return string*/function _delete($table, $where = array(), $like = array(), $limit = FALSE){$conditions = '';if (count($where) > 0 OR count($like) > 0){$conditions = "\nWHERE ";$conditions .= implode("\n", $this->ar_where);if (count($where) > 0 && count($like) > 0){$conditions .= " AND ";}$conditions .= implode("\n", $like);}$limit = ( ! $limit) ? '' : ' LIMIT '.$limit;return "DELETE FROM ".$table.$conditions.$limit;}// --------------------------------------------------------------------/*** Limit string** Generates a platform-specific LIMIT clause** @access public* @param string the sql query string* @param integer the number of rows to limit the query to* @param integer the offset value* @return string*/function _limit($sql, $limit, $offset){if ($offset == 0){$offset = '';}else{$offset .= ", ";}return $sql."LIMIT ".$offset.$limit;}// --------------------------------------------------------------------/*** Close DB Connection** @access public* @param resource* @return void*/function _close($conn_id){@mysql_close($conn_id);}}/* End of file mysql_driver.php *//* Location: ./system/database/drivers/mysql/mysql_driver.php */