/system/database/drivers/mysqli/mysqli_driver.php
PHP | 650 lines | 246 code | 98 blank | 306 comment | 27 complexity | 5ae78652904d59e443e7940a770dad0b MD5 | raw file
- <?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
- */
- // ------------------------------------------------------------------------
- /**
- * 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 {
- /**
- * 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);
- }
- // --------------------------------------------------------------------
- /**
- * 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, $this->database);
- }
- // --------------------------------------------------------------------
- /**
- * Set client character set
- *
- * @access public
- * @param string
- * @param string
- * @return resource
- */
- function db_set_charset($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 " . $this->_protect_identifiers($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($table)." LIMIT 1";
- }
- // --------------------------------------------------------------------
- /**
- * The error message string
- *
- * @access private
- * @return string
- */
- function _error_message()
- {
- return mysqli_error($this->conn_id);
- }
-
- // --------------------------------------------------------------------
- /**
- * The error message number
- *
- * @access private
- * @return integer
- */
- function _error_number()
- {
- return mysqli_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)
- {
- if (strpos($item, '.') !== FALSE)
- {
- $aliased_tables = implode(".",$this->ar_aliased_tables).'.';
- $table_name = substr($item, 0, strpos($item, '.')+1);
- $item = (strpos($aliased_tables, $table_name) !== FALSE) ? $item = $item : $this->dbprefix.$item;
- }
- // 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}`";
- }
- $exceptions = array('AS', '/', '-', '%', '+', '*', 'OR', 'IS');
-
- foreach ($exceptions as $exception)
- {
-
- if (stristr($item, " `{$exception}` ") !== FALSE)
- {
- $item = preg_replace('/ `('.preg_quote($exception).')` /i', ' $1 ', $item);
- }
- }
- return $item;
- }
-
- // --------------------------------------------------------------------
- /**
- * From Tables
- *
- * This function implicitly groups FROM tables so there is no confusion
- * about operator precedence in harmony with SQL standards
- *
- * @access public
- * @param type
- * @return type
- */
- function _from_tables($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, $values)
- {
- return "INSERT INTO ".$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):'';
-
- $sql = "UPDATE ".$this->_escape_table($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 ".$this->_escape_table($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 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 */