diff options
Diffstat (limited to 'system/database/drivers/mysql/mysql_driver.php')
| -rw-r--r-- | system/database/drivers/mysql/mysql_driver.php | 555 |
1 files changed, 141 insertions, 414 deletions
diff --git a/system/database/drivers/mysql/mysql_driver.php b/system/database/drivers/mysql/mysql_driver.php index f87cfea4b..5937b223b 100644 --- a/system/database/drivers/mysql/mysql_driver.php +++ b/system/database/drivers/mysql/mysql_driver.php @@ -1,75 +1,86 @@ -<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); +<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); /** * CodeIgniter * - * An open source application development framework for PHP 5.1.6 or newer + * An open source application development framework for PHP 5.2.4 or newer + * + * NOTICE OF LICENSE + * + * Licensed under the Open Software License version 3.0 + * + * This source file is subject to the Open Software License (OSL 3.0) that is + * bundled with this package in the files license.txt / license.rst. It is + * also available through the world wide web at this URL: + * http://opensource.org/licenses/OSL-3.0 + * If you did not receive a copy of the license and are unable to obtain it + * through the world wide web, please send an email to + * licensing@ellislab.com so we can send you a copy immediately. * * @package CodeIgniter - * @author ExpressionEngine Dev Team - * @copyright Copyright (c) 2008 - 2011, EllisLab, Inc. - * @license http://codeigniter.com/user_guide/license.html + * @author EllisLab Dev Team + * @copyright Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/) + * @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0) * @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 + * creates dynamically based on whether the query builder * class is being used or not. * * @package CodeIgniter * @subpackage Drivers * @category Database - * @author ExpressionEngine Dev Team + * @author EllisLab Dev Team * @link http://codeigniter.com/user_guide/database/ */ class CI_DB_mysql_driver extends CI_DB { - var $dbdriver = 'mysql'; + public $dbdriver = 'mysql'; // The character used for escaping - var $_escape_char = '`'; + protected $_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; + protected $_like_escape_str = ''; + protected $_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 + protected $_count_string = 'SELECT COUNT(*) AS '; + protected $_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 + * 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. */ - function db_connect() + public $delete_hack = TRUE; + + public function __construct($params) { - if ($this->port != '') + parent::__construct($params); + + if ( ! empty($this->port)) { $this->hostname .= ':'.$this->port; } + } + /** + * Non-persistent database connection + * + * @return resource + */ + public function db_connect() + { return @mysql_connect($this->hostname, $this->username, $this->password, TRUE); } @@ -78,16 +89,10 @@ class CI_DB_mysql_driver extends CI_DB { /** * Persistent database connection * - * @access private called by the base class * @return resource */ - function db_pconnect() + public function db_pconnect() { - if ($this->port != '') - { - $this->hostname .= ':'.$this->port; - } - return @mysql_pconnect($this->hostname, $this->username, $this->password); } @@ -99,10 +104,9 @@ class CI_DB_mysql_driver extends CI_DB { * Keep / reestablish the db connection if no queries have been * sent for a length of time exceeding the server's idle timeout * - * @access public * @return void */ - function reconnect() + public function reconnect() { if (mysql_ping($this->conn_id) === FALSE) { @@ -115,12 +119,23 @@ class CI_DB_mysql_driver extends CI_DB { /** * Select the database * - * @access private called by the base class - * @return resource + * @param string database name + * @return bool */ - function db_select() + public function db_select($database = '') { - return @mysql_select_db($this->database, $this->conn_id); + if ($database === '') + { + $database = $this->database; + } + + if (@mysql_select_db($database, $this->conn_id)) + { + $this->database = $database; + return TRUE; + } + + return FALSE; } // -------------------------------------------------------------------- @@ -128,40 +143,26 @@ class CI_DB_mysql_driver extends CI_DB { /** * Set client character set * - * @access public * @param string - * @param string - * @return resource + * @return bool */ - function db_set_charset($charset, $collation) + protected function _db_set_charset($charset) { - 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, $this->conn_id); - } + return @mysql_set_charset($charset, $this->conn_id); } // -------------------------------------------------------------------- /** - * Version number query string + * Database version number * - * @access public * @return string */ - function _version() + public function version() { - return "SELECT version() AS ver"; + return isset($this->data_cache['version']) + ? $this->data_cache['version'] + : $this->data_cache['version'] = @mysql_get_server_info($this->conn_id); } // -------------------------------------------------------------------- @@ -169,14 +170,12 @@ class CI_DB_mysql_driver extends CI_DB { /** * Execute the query * - * @access private called by the base class * @param string an SQL query - * @return resource + * @return mixed */ - function _execute($sql) + protected function _execute($sql) { - $sql = $this->_prep_query($sql); - return @mysql_query($sql, $this->conn_id); + return @mysql_query($this->_prep_query($sql), $this->conn_id); } // -------------------------------------------------------------------- @@ -186,20 +185,16 @@ class CI_DB_mysql_driver extends CI_DB { * * If needed, each database adapter can prep the query string * - * @access private called by execute() * @param string an SQL query * @return string */ - function _prep_query($sql) + protected 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) + // mysql_affected_rows() returns 0 for "DELETE FROM TABLE" queries. This hack + // modifies the query so that it a proper number of affected rows is returned. + if ($this->delete_hack === TRUE && preg_match('/^\s*DELETE\s+FROM\s+(\S+)\s*$/i', $sql)) { - if (preg_match('/^\s*DELETE\s+FROM\s+(\S+)\s*$/i', $sql)) - { - $sql = preg_replace("/^\s*DELETE\s+FROM\s+(\S+)\s*$/", "DELETE FROM \\1 WHERE 1=1", $sql); - } + return preg_replace('/^\s*DELETE\s+FROM\s+(\S+)\s*$/', 'DELETE FROM \\1 WHERE 1=1', $sql); } return $sql; @@ -210,18 +205,12 @@ class CI_DB_mysql_driver extends CI_DB { /** * Begin Transaction * - * @access public * @return bool */ - function trans_begin($test_mode = FALSE) + public 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) + if ( ! $this->trans_enabled OR $this->_trans_depth > 0) { return TRUE; } @@ -229,7 +218,7 @@ class CI_DB_mysql_driver extends CI_DB { // 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; + $this->_trans_failure = ($test_mode === TRUE); $this->simple_query('SET AUTOCOMMIT=0'); $this->simple_query('START TRANSACTION'); // can also be BEGIN or BEGIN WORK @@ -241,18 +230,12 @@ class CI_DB_mysql_driver extends CI_DB { /** * Commit Transaction * - * @access public * @return bool */ - function trans_commit() + public 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) + if ( ! $this->trans_enabled OR $this->_trans_depth > 0) { return TRUE; } @@ -267,18 +250,12 @@ class CI_DB_mysql_driver extends CI_DB { /** * Rollback Transaction * - * @access public * @return bool */ - function trans_rollback() + public 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) + if ( ! $this->trans_enabled OR $this->_trans_depth > 0) { return TRUE; } @@ -293,12 +270,11 @@ class CI_DB_mysql_driver extends CI_DB { /** * Escape String * - * @access public * @param string * @param bool whether or not the string will be used in a LIKE condition * @return string */ - function escape_str($str, $like = FALSE) + public function escape_str($str, $like = FALSE) { if (is_array($str)) { @@ -310,23 +286,14 @@ class CI_DB_mysql_driver extends CI_DB { 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); - } + $str = is_resource($this->conn_id) ? mysql_real_escape_string($str, $this->conn_id) : addslashes($str); // escape LIKE condition wildcards if ($like === TRUE) { - $str = str_replace(array('%', '_'), array('\\%', '\\_'), $str); + return str_replace(array($this->_like_escape_chr, '%', '_'), + array($this->_like_escape_chr.$this->_like_escape_chr, $this->_like_escape_chr.'%', $this->_like_escape_chr.'_'), + $str); } return $str; @@ -337,10 +304,9 @@ class CI_DB_mysql_driver extends CI_DB { /** * Affected Rows * - * @access public - * @return integer + * @return int */ - function affected_rows() + public function affected_rows() { return @mysql_affected_rows($this->conn_id); } @@ -350,10 +316,9 @@ class CI_DB_mysql_driver extends CI_DB { /** * Insert ID * - * @access public - * @return integer + * @return int */ - function insert_id() + public function insert_id() { return @mysql_insert_id($this->conn_id); } @@ -361,52 +326,20 @@ class CI_DB_mysql_driver extends CI_DB { // -------------------------------------------------------------------- /** - * "Count All" query - * - * Generates a platform-specific query string that counts all records in - * the specified database - * - * @access public - * @param string - * @return string - */ - function count_all($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) $row->numrows; - } - - // -------------------------------------------------------------------- - - /** * List table query * * Generates a platform-specific query string so that the table names can be fetched * - * @access private - * @param boolean + * @param bool * @return string */ - function _list_tables($prefix_limit = FALSE) + protected function _list_tables($prefix_limit = FALSE) { - $sql = "SHOW TABLES FROM ".$this->_escape_char.$this->database.$this->_escape_char; + $sql = 'SHOW TABLES FROM '.$this->_escape_char.$this->database.$this->_escape_char; - if ($prefix_limit !== FALSE AND $this->dbprefix != '') + if ($prefix_limit !== FALSE && $this->dbprefix !== '') { - $sql .= " LIKE '".$this->escape_like_str($this->dbprefix)."%'"; + return $sql." LIKE '".$this->escape_like_str($this->dbprefix)."%'"; } return $sql; @@ -419,97 +352,61 @@ class CI_DB_mysql_driver extends CI_DB { * * Generates a platform-specific query string so that the column names can be fetched * - * @access public * @param string the table name * @return string */ - function _list_columns($table = '') + public function _list_columns($table = '') { - return "SHOW COLUMNS FROM ".$this->_protect_identifiers($table, TRUE, NULL, FALSE); + return 'SHOW COLUMNS FROM '.$this->protect_identifiers($table, TRUE, NULL, FALSE); } // -------------------------------------------------------------------- /** - * Field data query - * - * Generates a platform-specific query so that the column data can be retrieved + * Returns an object with field data * - * @access public * @param string the table name * @return object */ - function _field_data($table) + public function field_data($table = '') { - return "DESCRIBE ".$table; - } + if ($table === '') + { + return ($this->db_debug) ? $this->display_error('db_field_param_missing') : FALSE; + } - // -------------------------------------------------------------------- + $query = $this->query('DESCRIBE '.$this->protect_identifiers($table, TRUE, NULL, FALSE)); + $query = $query->result_object(); - /** - * The error message string - * - * @access private - * @return string - */ - function _error_message() - { - return mysql_error($this->conn_id); - } + $retval = array(); + for ($i = 0, $c = count($query); $i < $c; $i++) + { + preg_match('/([a-z]+)(\(\d+\))?/', $query[$i]->Type, $matches); - // -------------------------------------------------------------------- + $retval[$i] = new stdClass(); + $retval[$i]->name = $query[$i]->Field; + $retval[$i]->type = empty($matches[1]) ? NULL : $matches[1]; + $retval[$i]->default = $query[$i]->Default; + $retval[$i]->max_length = empty($matches[2]) ? NULL : preg_replace('/[^\d]/', '', $matches[2]); + $retval[$i]->primary_key = (int) ($query[$i]->Key === 'PRI'); + } - /** - * The error message number - * - * @access private - * @return integer - */ - function _error_number() - { - return mysql_errno($this->conn_id); + return $retval; } // -------------------------------------------------------------------- /** - * Escape the SQL Identifiers + * Error * - * This function escapes column and table names + * Returns an array containing code and message of the last + * database error that has occured. * - * @access private - * @param string - * @return string + * @return array */ - function _escape_identifiers($item) + public function error() { - 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, $str); + return array('code' => mysql_errno($this->conn_id), 'message' => mysql_error($this->conn_id)); } // -------------------------------------------------------------------- @@ -520,11 +417,10 @@ class CI_DB_mysql_driver extends CI_DB { * This function implicitly groups FROM tables so there is no confusion * about operator precedence in harmony with SQL standards * - * @access public - * @param type - * @return type + * @param string table name + * @return string */ - function _from_tables($tables) + protected function _from_tables($tables) { if ( ! is_array($tables)) { @@ -537,198 +433,42 @@ class CI_DB_mysql_driver extends CI_DB { // -------------------------------------------------------------------- /** - * 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, $where = NULL) + protected function _update_batch($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 != $index) + if ($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); + $cases .= $k." = CASE \n" + .implode("\n", $v)."\n" + .'ELSE '.$k.' END, '; } - $limit = ( ! $limit) ? '' : ' LIMIT '.$limit; - - return "DELETE FROM ".$table.$conditions.$limit; + return 'UPDATE '.$table.' SET '.substr($cases, 0, -2) + .' WHERE '.(($where !== '' && count($where) > 0) ? implode(' ', $where).' AND ' : '') + .$index.' IN('.implode(',', $ids).')'; } // -------------------------------------------------------------------- @@ -738,24 +478,14 @@ class CI_DB_mysql_driver extends CI_DB { * * Generates a platform-specific LIMIT clause * - * @access public * @param string the sql query string - * @param integer the number of rows to limit the query to - * @param integer the offset value + * @param int the number of rows to limit the query to + * @param int the offset value * @return string */ - function _limit($sql, $limit, $offset) + protected function _limit($sql, $limit, $offset) { - if ($offset == 0) - { - $offset = ''; - } - else - { - $offset .= ", "; - } - - return $sql."LIMIT ".$offset.$limit; + return $sql.' LIMIT '.($offset == 0 ? '' : $offset.', ').$limit; } // -------------------------------------------------------------------- @@ -763,17 +493,14 @@ class CI_DB_mysql_driver extends CI_DB { /** * Close DB Connection * - * @access public - * @param resource * @return void */ - function _close($conn_id) + protected function _close() { - @mysql_close($conn_id); + @mysql_close($this->conn_id); } } - /* End of file mysql_driver.php */ /* Location: ./system/database/drivers/mysql/mysql_driver.php */
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