<?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) 2006, 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 { /** * 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 $_random_keyword = ' RAND()'; // database specific random keyword /** * Non-persistent database connection * * @access private called by the base class * @return resource */ function db_connect() { return @mysql_connect($this->hostname, $this->username, $this->password, TRUE); } // -------------------------------------------------------------------- /** * Persistent database connection * * @access private called by the base class * @return resource */ function db_pconnect() { return @mysql_pconnect($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 rows if ($this->delete_hack === TRUE) { if (preg_match('/^\s*DELETE\s+FROM\s+(\S+)\s*$/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 ( ! $this->trans_enabled) { return TRUE; } // When transactions are nested we only begin/commit/rollback the outermost ones if ($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 WORK return TRUE; } // -------------------------------------------------------------------- /** * Commit Transaction * * @access public * @return bool */ function trans_commit() { if ( ! $this->trans_enabled) { return TRUE; } // When transactions are nested we only begin/commit/rollback the outermost ones if ($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 ( ! $this->trans_enabled) { return TRUE; } // When transactions are nested we only begin/commit/rollback the outermost ones if ($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 " . $this->_protect_identifiers($this->dbprefix.$table)); if ($query->num_rows() == 0) return '0'; $row = $query->row(); return $row->numrows; } // -------------------------------------------------------------------- /** * List table query * * Generates a platform-specific query string so that the table names can be fetched * * @access private * @param boolean * @return string */ function _list_tables($prefix_limit = FALSE) { $sql = "SHOW TABLES FROM `".$this->database."`"; 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 ".$this->_escape_table($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($table) { return "SELECT * FROM ".$this->_escape_table($table)." LIMIT 1"; } // -------------------------------------------------------------------- /** * The error message string * * @access private * @return string */ function _error_message() { return mysql_error($this->conn_id); } // -------------------------------------------------------------------- /** * The error message number * * @access private * @return integer */ function _error_number() { return mysql_errno($this->conn_id); } // -------------------------------------------------------------------- /** * Escape Table Name * * This function adds backticks if the table name has a period * in it. Some DBs will get cranky unless periods are escaped * * @access private * @param string the table name * @return string */ function _escape_table($table) { if (strpos($table, '.') !== FALSE) { $table = str_replace('.', '`.`', $table); } return $table; } // -------------------------------------------------------------------- /** * Protect Identifiers * * This function adds backticks if appropriate based on db type * * @access private * @param mixed the item to escape * @param boolean only affect the first word * @return mixed the item with backticks */ function _protect_identifiers($item, $first_word_only = FALSE) { if (is_array($item)) { $escaped_array = array(); foreach($item as $k=>$v) { $escaped_array[$this->_protect_identifiers($k)] = $this->_protect_identifiers($v, $first_word_only); } return $escaped_array; } // This function may get "item1 item2" as a string, and so // we may need "`item1` `item2`" and not "`item1 item2`" if (ctype_alnum($item) === FALSE) { // This function may get "field >= 1", and need it to return "`field` >= 1" $lbound = ($first_word_only === TRUE) ? '' : '|\s|\('; $item = preg_replace('/(^'.$lbound.')([\w\d\-\_]+?)(\s|\)|$)/iS', '$1`$2`$3', $item); } else { return "`{$item}`"; } $exceptions = array('AS', '/', '-', '%', '+', '*'); foreach ($exceptions as $exception) { if (stristr($item, " `{$exception}` ") !== FALSE) { $item = preg_replace('/ `('.preg_quote($exception).')` /i', ' $1 ', $item); } } return $item; } // -------------------------------------------------------------------- /** * Insert statement * * Generates a platform-specific insert string from the supplied data * * @access public * @param string the table name * @param array the insert keys * @param array the insert values * @return string */ function _insert($table, $keys, $values) { return "INSERT INTO ".$this->_escape_table($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(", ", $orderby):''; return "UPDATE ".$this->_escape_table($table)." SET ".implode(', ', $valstr)." WHERE ".implode(" ", $where).$orderby.$limit; } // -------------------------------------------------------------------- /** * Truncate statement * * Generates a platform-specific truncate string from the supplied data * If the database does not support the truncate() command * This function maps to "DELETE FROM table" * * @access public * @param string the table name * @return string */ function _truncate($table) { return "TRUNCATE ".$this->_escape_table($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 || 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); } } ?>