<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class CI_DB_mssql_driver extends CI_DB {
public $dbdriver = 'mssql';
protected $_random_keyword = array('NEWID()', 'RAND(%d)');
protected $_quoted_identifier = TRUE;
public function __construct($params)
{
parent::__construct($params);
if ( ! empty($this->port))
{
$this->hostname .= (DIRECTORY_SEPARATOR === '\\' ? ',' : ':').$this->port;
}
}
public function db_connect($persistent = FALSE)
{
$this->conn_id = ($persistent)
? mssql_pconnect($this->hostname, $this->username, $this->password)
: mssql_connect($this->hostname, $this->username, $this->password);
if ( ! $this->conn_id)
{
return FALSE;
}
if ($this->database !== '' && ! $this->db_select())
{
log_message('error', 'Unable to select database: '.$this->database);
return ($this->db_debug === TRUE)
? $this->display_error('db_unable_to_select', $this->database)
: FALSE;
}
$query = $this->query('SELECT CASE WHEN (@@OPTIONS | 256) = @@OPTIONS THEN 1 ELSE 0 END AS qi');
$query = $query->row_array();
$this->_quoted_identifier = empty($query) ? FALSE : (bool) $query['qi'];
$this->_escape_char = ($this->_quoted_identifier) ? '"' : array('[', ']');
return $this->conn_id;
}
public function db_select($database = '')
{
if ($database === '')
{
$database = $this->database;
}
if (mssql_select_db('['.$database.']', $this->conn_id))
{
$this->database = $database;
$this->data_cache = array();
return TRUE;
}
return FALSE;
}
protected function _execute($sql)
{
return mssql_query($sql, $this->conn_id);
}
protected function _trans_begin()
{
return $this->simple_query('BEGIN TRAN');
}
protected function _trans_commit()
{
return $this->simple_query('COMMIT TRAN');
}
protected function _trans_rollback()
{
return $this->simple_query('ROLLBACK TRAN');
}
public function affected_rows()
{
return mssql_rows_affected($this->conn_id);
}
public function insert_id()
{
$query = version_compare($this->version(), '8', '>=')
? 'SELECT SCOPE_IDENTITY() AS last_id'
: 'SELECT @@IDENTITY AS last_id';
$query = $this->query($query);
$query = $query->row();
return $query->last_id;
}
protected function _db_set_charset($charset)
{
return (ini_set('mssql.charset', $charset) !== FALSE);
}
protected function _version()
{
return "SELECT SERVERPROPERTY('ProductVersion') AS ver";
}
protected function _list_tables($prefix_limit = FALSE)
{
$sql = 'SELECT '.$this->escape_identifiers('name')
.' FROM '.$this->escape_identifiers('sysobjects')
.' WHERE '.$this->escape_identifiers('type')." = 'U'";
if ($prefix_limit !== FALSE && $this->dbprefix !== '')
{
$sql .= ' AND '.$this->escape_identifiers('name')." LIKE '".$this->escape_like_str($this->dbprefix)."%' "
.sprintf($this->_like_escape_str, $this->_like_escape_chr);
}
return $sql.' ORDER BY '.$this->escape_identifiers('name');
}
protected function _list_columns($table = '')
{
return 'SELECT COLUMN_NAME
FROM INFORMATION_SCHEMA.Columns
WHERE UPPER(TABLE_NAME) = '.$this->escape(strtoupper($table));
}
public function field_data($table)
{
$sql = 'SELECT COLUMN_NAME, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH, NUMERIC_PRECISION, COLUMN_DEFAULT
FROM INFORMATION_SCHEMA.Columns
WHERE UPPER(TABLE_NAME) = '.$this->escape(strtoupper($table));
if (($query = $this->query($sql)) === FALSE)
{
return FALSE;
}
$query = $query->result_object();
$retval = array();
for ($i = 0, $c = count($query); $i < $c; $i++)
{
$retval[$i] = new stdClass();
$retval[$i]->name = $query[$i]->COLUMN_NAME;
$retval[$i]->type = $query[$i]->DATA_TYPE;
$retval[$i]->max_length = ($query[$i]->CHARACTER_MAXIMUM_LENGTH > 0) ? $query[$i]->CHARACTER_MAXIMUM_LENGTH : $query[$i]->NUMERIC_PRECISION;
$retval[$i]->default = $query[$i]->COLUMN_DEFAULT;
}
return $retval;
}
public function error()
{
static $error = array('code' => 0, 'message' => NULL);
$message = mssql_get_last_message();
if ( ! empty($message))
{
$error['code'] = $this->query('SELECT @@ERROR AS code')->row()->code;
$error['message'] = $message;
}
return $error;
}
protected function _update($table, $values)
{
$this->qb_limit = FALSE;
$this->qb_orderby = array();
return parent::_update($table, $values);
}
protected function _truncate($table)
{
return 'TRUNCATE TABLE '.$table;
}
protected function _delete($table)
{
if ($this->qb_limit)
{
return 'WITH ci_delete AS (SELECT TOP '.$this->qb_limit.' * FROM '.$table.$this->_compile_wh('qb_where').') DELETE FROM ci_delete';
}
return parent::_delete($table);
}
protected function _limit($sql)
{
$limit = $this->qb_offset + $this->qb_limit;
if (version_compare($this->version(), '9', '>=') && $this->qb_offset && ! empty($this->qb_orderby))
{
$orderby = $this->_compile_order_by();
$sql = trim(substr($sql, 0, strrpos($sql, $orderby)));
if (count($this->qb_select) === 0)
{
$select = '*'; }
else
{
$select = array();
$field_regexp = ($this->_quoted_identifier)
? '("[^\"]+")' : '(\[[^\]]+\])';
for ($i = 0, $c = count($this->qb_select); $i < $c; $i++)
{
$select[] = preg_match('/(?:\s|\.)'.$field_regexp.'$/i', $this->qb_select[$i], $m)
? $m[1] : $this->qb_select[$i];
}
$select = implode(', ', $select);
}
return 'SELECT '.$select." FROM (\n\n"
.preg_replace('/^(SELECT( DISTINCT)?)/i', '\\1 ROW_NUMBER() OVER('.trim($orderby).') AS '.$this->escape_identifiers('CI_rownum').', ', $sql)
."\n\n) ".$this->escape_identifiers('CI_subquery')
."\nWHERE ".$this->escape_identifiers('CI_rownum').' BETWEEN '.($this->qb_offset + 1).' AND '.$limit;
}
return preg_replace('/(^\SELECT (DISTINCT)?)/i','\\1 TOP '.$limit.' ', $sql);
}
protected function _insert_batch($table, $keys, $values)
{
if (version_compare($this->version(), '10', '>='))
{
return parent::_insert_batch($table, $keys, $values);
}
return ($this->db_debug) ? $this->display_error('db_unsupported_feature') : FALSE;
}
protected function _close()
{
mssql_close($this->conn_id);
}
}