From 39b622db9bda38282a32bb45623da63efe685729 Mon Sep 17 00:00:00 2001 From: Derek Allard Date: Wed, 16 Jan 2008 21:10:09 +0000 Subject: Many new Active Record functions, and another whack of stuff --- system/database/drivers/mysql/mysql_driver.php | 127 ++++++++++++++++++++++--- 1 file changed, 116 insertions(+), 11 deletions(-) (limited to 'system/database/drivers/mysql/mysql_driver.php') diff --git a/system/database/drivers/mysql/mysql_driver.php b/system/database/drivers/mysql/mysql_driver.php index cd86ebf52..a164552ed 100644 --- a/system/database/drivers/mysql/mysql_driver.php +++ b/system/database/drivers/mysql/mysql_driver.php @@ -42,7 +42,7 @@ class CI_DB_mysql_driver extends CI_DB { * 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 numrows "; + var $_count_string = 'SELECT COUNT(*) AS '; var $_random_keyword = ' RAND()'; // database specific random keyword /** @@ -84,6 +84,21 @@ class CI_DB_mysql_driver extends CI_DB { // -------------------------------------------------------------------- + /** + * Set client character set + * + * @access public + * @param string + * @param string + * @return resource + */ + function db_set_charset($charset, $collation) + { + return @mysql_query("SET NAMES '".$this->escape_str($charset)."' COLLATE '".$this->escape_str($collation)."'", $this->conn_id); + } + + // -------------------------------------------------------------------- + /** * Version number query string * @@ -314,17 +329,18 @@ class CI_DB_mysql_driver extends CI_DB { * Generates a platform-specific query string so that the table names can be fetched * * @access private + * @param boolean * @return string */ function _list_tables($prefix_limit = FALSE) { $sql = "SHOW TABLES FROM `".$this->database."`"; - - if ($prefix_limit !== FALSE AND $this->_stdprefix != '') + + if ($prefix_limit !== FALSE AND $this->dbprefix != '') { - $sql .= " LIKE '".$this->_stdprefix."%'"; + $sql .= " LIKE '".$this->dbprefix."%'"; } - + return $sql; } @@ -400,14 +416,66 @@ class CI_DB_mysql_driver extends CI_DB { */ function _escape_table($table) { - if (stristr($table, '.')) + if (strpos($table, '.') !== FALSE) { - $table = preg_replace("/\./", "`.`", $table); + $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 $escaped_array; + } + + // This function may get "item1 item2" as a string, and so + // we may need "`item1` `item2`" and not "`item1 item2`" + if (strpos($item, ' ') !== FALSE) + { + // This function may get "field >= 1", and need it to return "`field` >= 1" + if ($first_word_only === TRUE) + { + return '`'.preg_replace('/ /', '` ', $item, 1); + } + + $item = preg_replace('/(^|\s|\()([\w\d\-\_]+?)(\s|\)|$)/iS', '$1`$2`$3', $item); + } + + $exceptions = array('AS', '/', '-', '%', '+', '*'); + + foreach ($exceptions as $exception) + { + if (stristr($item, " `{$exception}` ") !== FALSE) + { + $item = preg_replace('/ `('.preg_quote($exception).')` /i', ' $1 ', $item); + } + } + return $item; + } + // -------------------------------------------------------------------- /** @@ -437,9 +505,11 @@ class CI_DB_mysql_driver extends CI_DB { * @param string the table name * @param array the update data * @param array the where clause + * @param array the orderby clause + * @param array the limit clause * @return string */ - function _update($table, $values, $where, $limit = FALSE) + function _update($table, $values, $where, $orderby = array(), $limit = FALSE) { foreach($values as $key => $val) { @@ -447,8 +517,28 @@ class CI_DB_mysql_driver extends CI_DB { } $limit = (!$limit) ? '' : ' LIMIT '.$limit; + + $orderby = (count($orderby) >= 1)?' ORDER BY '.implode(", ", $orderby):''; - return "UPDATE ".$this->_escape_table($table)." SET ".implode(', ', $valstr)." WHERE ".implode(" ", $where).$limit; + return "UPDATE ".$this->_escape_table($table)." SET ".implode(', ', $valstr)." WHERE ".implode(" ", $where).$orderby.$limit; + } + + // -------------------------------------------------------------------- + + /** + * Truncate statement + * + * Generates a platform-specific truncate string from the supplied data + * If the database does not support the truncate() command + * This function maps to "DELETE FROM table" + * + * @access public + * @param string the table name + * @return string + */ + function _truncate($table) + { + return "TRUNCATE ".$this->_escape_table($table); } // -------------------------------------------------------------------- @@ -461,13 +551,28 @@ class CI_DB_mysql_driver extends CI_DB { * @access public * @param string the table name * @param array the where clause + * @param string the limit clause * @return string */ - function _delete($table, $where, $limit = FALSE) + function _delete($table, $where = array(), $like = array(), $limit = FALSE) { + $conditions = ''; + + if (count($where) > 0 || 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 '.$limit; - return "DELETE FROM ".$this->_escape_table($table)." WHERE ".implode(" ", $where).$limit; + return "DELETE FROM ".$table.$conditions.$limit; } // -------------------------------------------------------------------- -- cgit v1.2.3-24-g4f1b