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| <?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 |
| */ |
| |
| // ------------------------------------------------------------------------ |
| |
| /** |
| * 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 = '`'; |
| |
| /** |
| * 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 $delete_hack = TRUE; |
| |
| // -------------------------------------------------------------------- |
| |
| /** |
| * Non-persistent database connection |
| * |
| * @access private called by the base class |
| * @return resource |
| */ |
| function db_connect() |
| { |
| return @mysqli_connect($this->hostname, $this->username, $this->password, $this->database, $this->port); |
| } |
| |
| // -------------------------------------------------------------------- |
| |
| /** |
| * Persistent database connection |
| * |
| * @access private called by the base class |
| * @return resource |
| */ |
| function db_pconnect() |
| { |
| return $this->db_connect(); |
| } |
| |
| // -------------------------------------------------------------------- |
| |
| /** |
| * Select the database |
| * |
| * @access private called by the base class |
| * @return resource |
| */ |
| function db_select() |
| { |
| return @mysqli_select_db($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'); |
| $this->simple_query('SET AUTOCOMMIT=1'); |
| return TRUE; |
| } |
| |
| // -------------------------------------------------------------------- |
| |
| /** |
| * Escape String |
| * |
| * @access public |
| * @param string |
| * @return string |
| */ |
| function escape_str($str) |
| { |
| if (function_exists('mysqli_real_escape_string') AND is_object($this->conn_id)) |
| { |
| return mysqli_real_escape_string($this->conn_id, $str); |
| } |
| elseif (function_exists('mysql_escape_string')) |
| { |
| return mysql_escape_string($str); |
| } |
| else |
| { |
| return addslashes($str); |
| } |
| } |
| |
| // -------------------------------------------------------------------- |
| |
| /** |
| * Affected Rows |
| * |
| * @access public |
| * @return integer |
| */ |
| function affected_rows() |
| { |
| return @mysqli_affected_rows($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 $row->numrows; |
| } |
| |
| // -------------------------------------------------------------------- |
| |
| /** |
| * List table query |
| * |
| * Generates a platform-specific query string so that the table names can be fetched |
| * |
| * @access private |
| * @param boolean |
| * @return string |
| */ |
| function _list_tables($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 ".$table." LIMIT 1"; |
| } |
| |
| // -------------------------------------------------------------------- |
| |
| /** |
| * The error message string |
| * |
| * @access private |
| * @return string |
| */ |
| function _error_message() |
| { |
| return mysqli_error($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 $item; |
| } |
| |
| if (strpos($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 */ |