<?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 - 2010, EllisLab, Inc. * @license http://codeigniter.com/user_guide/license.html * @link http://codeigniter.com * @since Version 1.0 * @filesource */ // ------------------------------------------------------------------------ /** * MySQLi Database Adapter Class - MySQLi only works with PHP 5 * * 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_mysqli_driver extends CI_DB { var $dbdriver = 'mysqli'; // The character used for escaping var $_escape_char = '`'; // clause and character used for LIKE escape sequences - not used in MySQL var $_like_escape_str = ''; var $_like_escape_chr = ''; /** * 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 /** * 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 $delete_hack = TRUE; // -------------------------------------------------------------------- /** * Non-persistent database connection * * @access private called by the base class * @return resource */ function db_connect() { if ($this->port != '') { return @mysqli_connect($this->hostname, $this->username, $this->password, $this->database, $this->port); } else { return @mysqli_connect($this->hostname, $this->username, $this->password, $this->database); } } // -------------------------------------------------------------------- /** * Persistent database connection * * @access private called by the base class * @return resource */ function db_pconnect() { return $this->db_connect(); } // -------------------------------------------------------------------- /** * Reconnect * * Keep / reestablish the db connection if no queries have been * sent for a length of time exceeding the server's idle timeout * * @access public * @return void */ function reconnect() { if (mysqli_ping($this->conn_id) === FALSE) { $this->conn_id = FALSE; } } // -------------------------------------------------------------------- /** * Select the database * * @access private called by the base class * @return resource */ function db_select() { return @mysqli_select_db($this->conn_id, $this->database); } // -------------------------------------------------------------------- /** * Set client character set * * @access private * @param string * @param string * @return resource */ function _db_set_charset($charset, $collation) { return @mysqli_query($this->conn_id, "SET NAMES '".$this->escape_str($charset)."' COLLATE '".$this->escape_str($collation)."'"); } // -------------------------------------------------------------------- /** * 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); $result = @mysqli_query($this->conn_id, $sql); return $result; } // -------------------------------------------------------------------- /** * Prep the query * * If needed, each database adapter can prep the query string * * @access private called by execute() * @param string an SQL query * @return string */ function _prep_query($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'); $this->simple_query('SET AUTOCOMMIT=1'); return TRUE; } // -------------------------------------------------------------------- /** * Escape String * * @access public * @param string * @param bool whether or not the string will be used in a LIKE condition * @return string */ function escape_str($str, $like = FALSE) { if (is_array($str)) { foreach($str as $key => $val) { $str[$key] = $this->escape_str($val, $like); } return $str; } if (function_exists('mysqli_real_escape_string') AND is_object($this->conn_id)) { $str = mysqli_real_escape_string($this->conn_id, $str); } elseif (function_exists('mysql_escape_string')) { $str = mysql_escape_string($str); } else { $str = addslashes($str); } // escape LIKE condition wildcards if ($like === TRUE) { $str = str_replace(array('%', '_'), array('\\%', '\\_'), $str); } return $str; } // -------------------------------------------------------------------- /** * Affected Rows * * @access public * @return integer */ function affected_rows() { return @mysqli_affected_rows($this->conn_id); } // -------------------------------------------------------------------- /** * Insert ID * * @access public * @return integer */ function insert_id() { return @mysqli_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->escape_like_str($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 ".$this->_protect_identifiers($table, TRUE, NULL, FALSE); } // -------------------------------------------------------------------- /** * 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 mysqli_error($this->conn_id); } // -------------------------------------------------------------------- /** * The error message number * * @access private * @return integer */ function _error_number() { return mysqli_errno($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 $item; } foreach ($this->_reserved_identifiers as $id) { if (strpos($item, '.'.$id) !== FALSE) { $str = $this->_escape_char. str_replace('.', $this->_escape_char.'.', $item); // remove duplicates if the user already included the escape return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str); } } if (strpos($item, '.') !== FALSE) { $str = $this->_escape_char.str_replace('.', $this->_escape_char.'.'.$this->_escape_char, $item).$this->_escape_char; } else { $str = $this->_escape_char.$item.$this->_escape_char; } // remove duplicates if the user already included the escape return preg_replace('/['.$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) { $sql .= "LIMIT ".$limit; if ($offset > 0) { $sql .= " OFFSET ".$offset; } return $sql; } // -------------------------------------------------------------------- /** * Close DB Connection * * @access public * @param resource * @return void */ function _close($conn_id) { @mysqli_close($conn_id); } } /* End of file mysqli_driver.php */ /* Location: ./system/database/drivers/mysqli/mysqli_driver.php */