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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); /** * CodeIgniter * * An open source application development framework for PHP 5.1.6 or newer * * @package CodeIgniter * @author ExpressionEngine Dev Team * @copyright Copyright (c) 2008 - 2011, 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 escaping var $_escape_char = '`'; // clause and character used for LIKE escape sequences - not used in MySQL var $_like_escape_str = ''; var $_like_escape_chr = ''; /** * 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 // whether SET NAMES must be used to set the character set var $use_set_names; /** * Non-persistent database connection * * @access private called by the base class * @return resource */ function db_connect() { if ($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, $this->password); } // -------------------------------------------------------------------- /** * Reconnect * * Keep / reestablish the db connection if no queries have been * sent for a length of time exceeding the server's idle timeout * * @access public * @return void */ function reconnect() { if (mysql_ping($this->conn_id) === FALSE) { $this->conn_id = FALSE; } } // -------------------------------------------------------------------- /** * Select the database * * @access private called by the base class * @return resource */ function db_select() { return @mysql_select_db($this->database, $this->conn_id); } // -------------------------------------------------------------------- /** * Set client character set * * @access public * @param string * @param string * @return resource */ function db_set_charset($charset, $collation) { if ( ! isset($this->use_set_names)) { // mysql_set_charset() requires PHP >= 5.2.3 and MySQL >= 5.0.7, use SET NAMES as fallback $this->use_set_names = (version_compare(PHP_VERSION, '5.2.3', '>=') && version_compare(mysql_get_server_info(), '5.0.7', '>=')) ? FALSE : TRUE; } if ($this->use_set_names === TRUE) { return @mysql_query("SET NAMES '".$this->escape_str($charset)."' COLLATE '".$this->escape_str($collation)."'", $this->conn_id); } else { return @mysql_set_charset($charset, $this->conn_id); } } // -------------------------------------------------------------------- /** * Version number query string * * @access public * @return string */ function _version() { return "SELECT version() AS ver"; } // -------------------------------------------------------------------- /** * Execute the query * * @access private called by the base class * @param string an SQL query * @return resource */ function _execute($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'); $this->simple_query('SET AUTOCOMMIT=1'); return TRUE; } // -------------------------------------------------------------------- /** * Escape String * * @access public * @param string * @param bool whether or not the string will be used in a LIKE condition * @return string */ function escape_str($str, $like = FALSE) { if (is_array($str)) { foreach ($str as $key => $val) { $str[$key] = $this->escape_str($val, $like); } return $str; } if (function_exists('mysql_real_escape_string') AND is_resource($this->conn_id)) { $str = mysql_real_escape_string($str, $this->conn_id); } 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 $str; } // -------------------------------------------------------------------- /** * Affected Rows * * @access public * @return integer */ function affected_rows() { return @mysql_affected_rows($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(); $this->_reset_select(); 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($table) { return "DESCRIBE ".$table; } // -------------------------------------------------------------------- /** * 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 $item; } foreach ($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(', ', $values).")"; } // -------------------------------------------------------------------- /** * Replace statement * * Generates a platform-specific replace string from the supplied data * * @access public * @param string the table name * @param array the insert keys * @param array the insert values * @return string */ function _replace($table, $keys, $values) { return "REPLACE INTO ".$table." (".implode(', ', $keys).") VALUES (".implode(', ', $values).")"; } // -------------------------------------------------------------------- /** * Insert_batch statement * * Generates a platform-specific insert string from the supplied data * * @access public * @param string the table name * @param array the insert keys * @param array the insert values * @return string */ function _insert_batch($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 $sql; } // -------------------------------------------------------------------- /** * Update_Batch statement * * Generates a platform-specific batch update string from the supplied data * * @access public * @param string the table name * @param array the update data * @param array the where clause * @return string */ function _update_batch($table, $values, $index, $where = NULL) { $ids = array(); $where = ($where != '' AND count($where) >=1) ? implode(" ", $where).' AND ' : ''; foreach ($values as $key => $val) { $ids[] = $val[$index]; foreach (array_keys($val) as $field) { if ($field != $index) { $final[$field][] = 'WHEN '.$index.' = '.$val[$index].' THEN '.$val[$field]; } } } $sql = "UPDATE ".$table." SET "; $cases = ''; foreach ($final as $k => $v) { $cases .= $k.' = CASE '."\n"; foreach ($v as $row) { $cases .= $row."\n"; } $cases .= 'ELSE '.$k.' END, '; } $sql .= substr($cases, 0, -2); $sql .= ' WHERE '.$where.$index.' IN ('.implode(',', $ids).')'; 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 */ |
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