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<?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) 2008, EllisLab, Inc. |
* @license http://codeigniter.com/user_guide/license.html |
* @link http://codeigniter.com |
* @since Version 1.0 |
* @filesource |
*/ |
|
// ------------------------------------------------------------------------ |
|
/** |
* MS SQL 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_mssql_driver extends CI_DB { |
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var $dbdriver = 'mssql'; |
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// The character used for escaping |
var $_escape_char = ''; |
/** |
* 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 $_random_keyword = ' ASC'; // not currently supported |
|
/** |
* Non-persistent database connection |
* |
* @access private called by the base class |
* @return resource |
*/ |
function db_connect() |
{ |
if ($this->port != '') |
{ |
$this->hostname .= ','.$this->port; |
} |
|
return @mssql_connect($this->hostname, $this->username, $this->password); |
} |
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// -------------------------------------------------------------------- |
|
/** |
* Persistent database connection |
* |
* @access private called by the base class |
* @return resource |
*/ |
function db_pconnect() |
{ |
if ($this->port != '') |
{ |
$this->hostname .= ','.$this->port; |
} |
|
return @mssql_pconnect($this->hostname, $this->username, $this->password); |
} |
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// -------------------------------------------------------------------- |
|
/** |
* Select the database |
* |
* @access private called by the base class |
* @return resource |
*/ |
function db_select() |
{ |
// Note: The brackets are required in the event that the DB name |
// contains reserved characters |
return @mssql_select_db('['.$this->database.']', $this->conn_id); |
} |
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// -------------------------------------------------------------------- |
|
/** |
* Set client character set |
* |
* @access public |
* @param string |
* @param string |
* @return resource |
*/ |
function db_set_charset($charset, $collation) |
{ |
// @todo - add support if needed |
return TRUE; |
} |
|
// -------------------------------------------------------------------- |
|
/** |
* Execute the query |
* |
* @access private called by the base class |
* @param string an SQL query |
* @return resource |
*/ |
function _execute($sql) |
{ |
$sql = $this->_prep_query($sql); |
return @mssql_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) |
{ |
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('BEGIN TRAN'); |
return TRUE; |
} |
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// -------------------------------------------------------------------- |
|
/** |
* 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 TRAN'); |
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; |
} |
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$this->simple_query('ROLLBACK TRAN'); |
return TRUE; |
} |
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// -------------------------------------------------------------------- |
|
/** |
* Escape String |
* |
* @access public |
* @param string |
* @return string |
*/ |
function escape_str($str) |
{ |
// Access the CI object |
$CI =& get_instance(); |
|
// Escape single quotes |
return str_replace("'", "''", $CI->input->_remove_invisible_characters($str)); |
} |
|
// -------------------------------------------------------------------- |
|
/** |
* Affected Rows |
* |
* @access public |
* @return integer |
*/ |
function affected_rows() |
{ |
return @mssql_rows_affected($this->conn_id); |
} |
|
// -------------------------------------------------------------------- |
|
/** |
* Insert ID |
* |
* Returns the last id created in the Identity column. |
* |
* @access public |
* @return integer |
*/ |
function insert_id() |
{ |
$ver = self::_parse_major_version($this->version()); |
$sql = ($ver >= 8 ? "SELECT SCOPE_IDENTITY() AS last_id" : "SELECT @@IDENTITY AS last_id"); |
$query = $this->query($sql); |
$row = $query->row(); |
return $row->last_id; |
} |
|
// -------------------------------------------------------------------- |
|
/** |
* Parse major version |
* |
* Grabs the major version number from the |
* database server version string passed in. |
* |
* @access private |
* @param string $version |
* @return int16 major version number |
*/ |
function _parse_major_version($version) |
{ |
preg_match('/([0-9]+)\.([0-9]+)\.([0-9]+)/', $version, $ver_info); |
return $ver_info[1]; // return the major version b/c that's all we're interested in. |
} |
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// -------------------------------------------------------------------- |
|
/** |
* Version number query string |
* |
* @access public |
* @return string |
*/ |
function _version() |
{ |
return "SELECT @@VERSION AS ver"; |
} |
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// -------------------------------------------------------------------- |
|
/** |
* "Count All" query |
* |
* Generates a platform-specific query string that counts all records in |
* the specified database |
* |
* @access public |
* @param string |
* @return string |
*/ |
function count_all($table = '') |
{ |
if ($table == '') |
return '0'; |
|
$query = $this->query($this->_count_string . $this->_protect_identifiers('numrows'). " FROM " . $this->_protect_identifiers($table, TRUE, NULL, FALSE)); |
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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) |
{ |
$sql = "SELECT name FROM sysobjects WHERE type = 'U' ORDER BY name"; |
|
// for future compatibility |
if ($prefix_limit !== FALSE AND $this->dbprefix != '') |
{ |
//$sql .= " LIKE '".$this->dbprefix."%'"; |
return FALSE; // not currently supported |
} |
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return $sql; |
} |
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// -------------------------------------------------------------------- |
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/** |
* List column query |
* |
* Generates a platform-specific query string so that the column names can be fetched |
* |
* @access private |
* @param string the table name |
* @return string |
*/ |
function _list_columns($table = '') |
{ |
return "SELECT * FROM INFORMATION_SCHEMA.Columns WHERE TABLE_NAME = '".$table."'"; |
} |
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// -------------------------------------------------------------------- |
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/** |
* Field data query |
* |
* Generates a platform-specific query so that the column data can be retrieved |
* |
* @access public |
* @param string the table name |
* @return object |
*/ |
function _field_data($table) |
{ |
return "SELECT TOP 1 * FROM ".$table; |
} |
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// -------------------------------------------------------------------- |
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/** |
* The error message string |
* |
* @access private |
* @return string |
*/ |
function _error_message() |
{ |
// Are errros even supported in MS SQL? |
return ''; |
} |
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// -------------------------------------------------------------------- |
|
/** |
* The error message number |
* |
* @access private |
* @return integer |
*/ |
function _error_number() |
{ |
// Are error numbers supported? |
return ''; |
} |
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// -------------------------------------------------------------------- |
|
/** |
* Escape the SQL Identifiers |
* |
* This function escapes column and table names |
* |
* @access private |
* @param string |
* @return string |
*/ |
function _escape_identifiers($item) |
{ |
if ($this->_escape_char == '') |
{ |
return $item; |
} |
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if (strpos($item, '.') !== FALSE) |
{ |
$str = $this->_escape_char.str_replace('.', $this->_escape_char.'.'.$this->_escape_char, $item).$this->_escape_char; |
} |
else |
{ |
$str = $this->_escape_char.$item.$this->_escape_char; |
} |
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// remove duplicates if the user already included the escape |
return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str); |
} |
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// -------------------------------------------------------------------- |
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/** |
* From Tables |
* |
* This function implicitly groups FROM tables so there is no confusion |
* about operator precedence in harmony with SQL standards |
* |
* @access public |
* @param type |
* @return type |
*/ |
function _from_tables($tables) |
{ |
if ( ! is_array($tables)) |
{ |
$tables = array($tables); |
} |
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return implode(', ', $tables); |
} |
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// -------------------------------------------------------------------- |
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/** |
* Insert statement |
* |
* Generates a platform-specific insert string from the supplied data |
* |
* @access public |
* @param string the table name |
* @param array the insert keys |
* @param array the insert values |
* @return string |
*/ |
function _insert($table, $keys, $values) |
{ |
return "INSERT INTO ".$table." (".implode(', ', $keys).") VALUES (".implode(', ', $values).")"; |
} |
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// -------------------------------------------------------------------- |
|
/** |
* Update statement |
* |
* Generates a platform-specific update string from the supplied data |
* |
* @access public |
* @param string the table name |
* @param array the update data |
* @param array the where clause |
* @param array the orderby clause |
* @param array the limit clause |
* @return string |
*/ |
function _update($table, $values, $where, $orderby = array(), $limit = FALSE) |
{ |
foreach($values as $key => $val) |
{ |
$valstr[] = $key." = ".$val; |
} |
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$limit = ( ! $limit) ? '' : ' LIMIT '.$limit; |
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$orderby = (count($orderby) >= 1)?' ORDER BY '.implode(", ", $orderby):''; |
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$sql = "UPDATE ".$table." SET ".implode(', ', $valstr); |
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$sql .= ($where != '' AND count($where) >=1) ? " WHERE ".implode(" ", $where) : ''; |
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$sql .= $orderby.$limit; |
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return $sql; |
} |
|
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// -------------------------------------------------------------------- |
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/** |
* Truncate statement |
* |
* Generates a platform-specific truncate string from the supplied data |
* If the database does not support the truncate() command |
* This function maps to "DELETE FROM table" |
* |
* @access public |
* @param string the table name |
* @return string |
*/ |
function _truncate($table) |
{ |
return "TRUNCATE ".$table; |
} |
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// -------------------------------------------------------------------- |
|
/** |
* Delete statement |
* |
* Generates a platform-specific delete string from the supplied data |
* |
* @access public |
* @param string the table name |
* @param array the where clause |
* @param string the limit clause |
* @return string |
*/ |
function _delete($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", $like); |
} |
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$limit = ( ! $limit) ? '' : ' LIMIT '.$limit; |
|
return "DELETE FROM ".$table.$conditions.$limit; |
} |
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// -------------------------------------------------------------------- |
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/** |
* Limit string |
* |
* Generates a platform-specific LIMIT clause |
* |
* @access public |
* @param string the sql query string |
* @param integer the number of rows to limit the query to |
* @param integer the offset value |
* @return string |
*/ |
function _limit($sql, $limit, $offset) |
{ |
$i = $limit + $offset; |
|
return preg_replace('/(^\SELECT (DISTINCT)?)/i','\\1 TOP '.$i.' ', $sql); |
} |
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// -------------------------------------------------------------------- |
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/** |
* Close DB Connection |
* |
* @access public |
* @param resource |
* @return void |
*/ |
function _close($conn_id) |
{ |
@mssql_close($conn_id); |
} |
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} |
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/* End of file mssql_driver.php */ |
/* Location: ./system/database/drivers/mssql/mssql_driver.php */ |