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-rw-r--r--system/database/drivers/mysql/mysql_driver.php231
1 files changed, 117 insertions, 114 deletions
diff --git a/system/database/drivers/mysql/mysql_driver.php b/system/database/drivers/mysql/mysql_driver.php
index c2fccc1f7..5af44371c 100644
--- a/system/database/drivers/mysql/mysql_driver.php
+++ b/system/database/drivers/mysql/mysql_driver.php
@@ -1,4 +1,4 @@
-<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+<?php
/**
* CodeIgniter
*
@@ -24,12 +24,13 @@
* @since Version 1.0
* @filesource
*/
+defined('BASEPATH') OR exit('No direct script access allowed');
/**
* 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
@@ -40,48 +41,78 @@
*/
class CI_DB_mysql_driver extends CI_DB {
+ /**
+ * Database driver
+ *
+ * @var string
+ */
public $dbdriver = 'mysql';
- // The character used for escaping
- protected $_escape_char = '`';
-
- // clause and character used for LIKE escape sequences - not used in MySQL
- 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.
+ * Compression flag
+ *
+ * @var bool
*/
- protected $_count_string = 'SELECT COUNT(*) AS ';
- protected $_random_keyword = ' RAND()'; // database specific random keyword
+ public $compress = FALSE;
/**
+ * DELETE hack flag
+ *
* 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 bool
*/
public $delete_hack = TRUE;
+ // --------------------------------------------------------------------
+
+ /**
+ * Identifier escape character
+ *
+ * @var string
+ */
+ protected $_escape_char = '`';
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Class constructor
+ *
+ * @param array $params
+ * @return void
+ */
public function __construct($params)
{
parent::__construct($params);
- if ($this->port != '')
+ if ( ! empty($this->port))
{
$this->hostname .= ':'.$this->port;
}
}
+ // --------------------------------------------------------------------
+
/**
* Non-persistent database connection
*
+ * @param bool $persistent
* @return resource
*/
- public function db_connect()
+ public function db_connect($persistent = FALSE)
{
- return @mysql_connect($this->hostname, $this->username, $this->password, TRUE);
+ $client_flags = ($this->compress === FALSE) ? 0 : MYSQL_CLIENT_COMPRESS;
+
+ if ($this->encrypt === TRUE)
+ {
+ $client_flags = $client_flags | MYSQL_CLIENT_SSL;
+ }
+
+ return ($persistent === TRUE)
+ ? @mysql_pconnect($this->hostname, $this->username, $this->password, $client_flags)
+ : @mysql_connect($this->hostname, $this->username, $this->password, TRUE, $client_flags);
}
// --------------------------------------------------------------------
@@ -93,7 +124,7 @@ class CI_DB_mysql_driver extends CI_DB {
*/
public function db_pconnect()
{
- return @mysql_pconnect($this->hostname, $this->username, $this->password);
+ return $this->db_connect(TRUE);
}
// --------------------------------------------------------------------
@@ -119,7 +150,7 @@ class CI_DB_mysql_driver extends CI_DB {
/**
* Select the database
*
- * @param string database name
+ * @param string $database
* @return bool
*/
public function db_select($database = '')
@@ -143,7 +174,7 @@ class CI_DB_mysql_driver extends CI_DB {
/**
* Set client character set
*
- * @param string
+ * @param string $charset
* @return bool
*/
protected function _db_set_charset($charset)
@@ -160,9 +191,21 @@ class CI_DB_mysql_driver extends CI_DB {
*/
public function version()
{
- return isset($this->data_cache['version'])
- ? $this->data_cache['version']
- : $this->data_cache['version'] = @mysql_get_server_info($this->conn_id);
+ if (isset($this->data_cache['version']))
+ {
+ return $this->data_cache['version'];
+ }
+ elseif ( ! $this->conn_id)
+ {
+ $this->initialize();
+ }
+
+ if ( ! $this->conn_id OR ($version = @mysql_get_server_info($this->conn_id)) === FALSE)
+ {
+ return FALSE;
+ }
+
+ return $this->data_cache['version'] = $version;
}
// --------------------------------------------------------------------
@@ -170,7 +213,7 @@ class CI_DB_mysql_driver extends CI_DB {
/**
* Execute the query
*
- * @param string an SQL query
+ * @param string $sql an SQL query
* @return mixed
*/
protected function _execute($sql)
@@ -185,7 +228,7 @@ class CI_DB_mysql_driver extends CI_DB {
*
* If needed, each database adapter can prep the query string
*
- * @param string an SQL query
+ * @param string $sql an SQL query
* @return string
*/
protected function _prep_query($sql)
@@ -205,6 +248,7 @@ class CI_DB_mysql_driver extends CI_DB {
/**
* Begin Transaction
*
+ * @param bool $test_mode
* @return bool
*/
public function trans_begin($test_mode = FALSE)
@@ -270,8 +314,8 @@ class CI_DB_mysql_driver extends CI_DB {
/**
* Escape String
*
- * @param string
- * @param bool whether or not the string will be used in a LIKE condition
+ * @param string $str
+ * @param bool $like Whether or not the string will be used in a LIKE condition
* @return string
*/
public function escape_str($str, $like = FALSE)
@@ -279,19 +323,21 @@ class CI_DB_mysql_driver extends CI_DB {
if (is_array($str))
{
foreach ($str as $key => $val)
- {
+ {
$str[$key] = $this->escape_str($val, $like);
- }
+ }
- return $str;
- }
+ return $str;
+ }
$str = is_resource($this->conn_id) ? mysql_real_escape_string($str, $this->conn_id) : addslashes($str);
// escape LIKE condition wildcards
if ($like === TRUE)
{
- return 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 $str;
@@ -324,47 +370,18 @@ class CI_DB_mysql_driver extends CI_DB {
// --------------------------------------------------------------------
/**
- * "Count All" query
- *
- * Generates a platform-specific query string that counts all records in
- * the specified database
- *
- * @param string
- * @return string
- */
- public function count_all($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;
- }
-
- $query = $query->row();
- $this->_reset_select();
- return (int) $query->numrows;
- }
-
- // --------------------------------------------------------------------
-
- /**
* List table query
*
* Generates a platform-specific query string so that the table names can be fetched
*
- * @param bool
+ * @param bool $prefix_limit
* @return string
*/
protected function _list_tables($prefix_limit = FALSE)
{
- $sql = 'SHOW TABLES FROM '.$this->_escape_char.$this->database.$this->_escape_char;
+ $sql = 'SHOW TABLES FROM '.$this->escape_identifiers($this->database);
- if ($prefix_limit !== FALSE && $this->dbprefix != '')
+ if ($prefix_limit !== FALSE && $this->dbprefix !== '')
{
return $sql." LIKE '".$this->escape_like_str($this->dbprefix)."%'";
}
@@ -379,10 +396,10 @@ class CI_DB_mysql_driver extends CI_DB {
*
* Generates a platform-specific query string so that the column names can be fetched
*
- * @param string the table name
+ * @param string $table
* @return string
*/
- public function _list_columns($table = '')
+ protected function _list_columns($table = '')
{
return 'SHOW COLUMNS FROM '.$this->protect_identifiers($table, TRUE, NULL, FALSE);
}
@@ -392,29 +409,34 @@ class CI_DB_mysql_driver extends CI_DB {
/**
* Returns an object with field data
*
- * @param string the table name
- * @return object
+ * @param string $table
+ * @return array
*/
public function field_data($table = '')
{
- if ($table == '')
+ if ($table === '')
{
return ($this->db_debug) ? $this->display_error('db_field_param_missing') : FALSE;
}
- $query = $this->query('DESCRIBE '.$this->protect_identifiers($table, TRUE, NULL, FALSE));
+ if (($query = $this->query('SHOW COLUMNS FROM '.$this->protect_identifiers($table, TRUE, NULL, FALSE))) === FALSE)
+ {
+ return FALSE;
+ }
$query = $query->result_object();
$retval = array();
for ($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 : $matches[1];
+
+ sscanf($query[$i]->Type, '%[a-z](%d)',
+ $retval[$i]->type,
+ $retval[$i]->max_length
+ );
+
$retval[$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');
}
@@ -439,37 +461,16 @@ class CI_DB_mysql_driver extends CI_DB {
// --------------------------------------------------------------------
/**
- * From Tables
- *
- * This function implicitly groups FROM tables so there is no confusion
- * about operator precedence in harmony with SQL standards
- *
- * @param string table name
- * @return string
- */
- protected function _from_tables($tables)
- {
- if ( ! is_array($tables))
- {
- $tables = array($tables);
- }
-
- return '('.implode(', ', $tables).')';
- }
-
- // --------------------------------------------------------------------
-
- /**
* Update_Batch statement
*
* Generates a platform-specific batch update string from the supplied data
*
- * @param string the table name
- * @param array the update data
- * @param array the where clause
+ * @param string $table Table name
+ * @param array $values Update data
+ * @param string $index WHERE key
* @return string
*/
- protected function _update_batch($table, $values, $index, $where = NULL)
+ protected function _update_batch($table, $values, $index)
{
$ids = array();
foreach ($values as $key => $val)
@@ -478,9 +479,9 @@ class CI_DB_mysql_driver extends CI_DB {
foreach (array_keys($val) as $field)
{
- if ($field != $index)
+ if ($field !== $index)
{
- $final[$field][] = 'WHEN '.$index.' = '.$val[$index].' THEN '.$val[$field];
+ $final[$field][] = 'WHEN '.$index.' = '.$val[$index].' THEN '.$val[$field];
}
}
}
@@ -493,26 +494,29 @@ class CI_DB_mysql_driver extends CI_DB {
.'ELSE '.$k.' END, ';
}
- return 'UPDATE '.$table.' SET '.substr($cases, 0, -2)
- .' WHERE '.(($where != '' && count($where) > 0) ? implode(' ', $where).' AND ' : '')
- .$index.' IN('.implode(',', $ids).')';
+ $this->where($index.' IN('.implode(',', $ids).')', NULL, FALSE);
+
+ return 'UPDATE '.$table.' SET '.substr($cases, 0, -2).$this->_compile_wh('qb_where');
}
// --------------------------------------------------------------------
/**
- * Limit string
+ * FROM tables
*
- * Generates a platform-specific LIMIT clause
+ * Groups tables in FROM clauses if needed, so there is no confusion
+ * about operator precedence.
*
- * @param string the sql query string
- * @param int the number of rows to limit the query to
- * @param int the offset value
* @return string
*/
- protected function _limit($sql, $limit, $offset)
+ protected function _from_tables()
{
- return $sql.' LIMIT '.($offset == 0 ? '' : $offset.', ').$limit;
+ if ( ! empty($this->qb_join) && count($this->qb_from) > 1)
+ {
+ return '('.implode(', ', $this->qb_from).')';
+ }
+
+ return implode(', ', $this->qb_from);
}
// --------------------------------------------------------------------
@@ -520,12 +524,11 @@ class CI_DB_mysql_driver extends CI_DB {
/**
* Close DB Connection
*
- * @param resource
* @return void
*/
- protected function _close($conn_id)
+ protected function _close()
{
- @mysql_close($conn_id);
+ @mysql_close($this->conn_id);
}
}