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-rw-r--r--system/database/drivers/sqlsrv/sqlsrv_driver.php668
1 files changed, 306 insertions, 362 deletions
diff --git a/system/database/drivers/sqlsrv/sqlsrv_driver.php b/system/database/drivers/sqlsrv/sqlsrv_driver.php
index 328c8fe7d..a43e2539a 100644
--- a/system/database/drivers/sqlsrv/sqlsrv_driver.php
+++ b/system/database/drivers/sqlsrv/sqlsrv_driver.php
@@ -1,351 +1,280 @@
-<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+<?php
/**
* CodeIgniter
*
- * An open source application development framework for PHP 5.1.6 or newer
+ * An open source application development framework for PHP
*
- * @package CodeIgniter
- * @author ExpressionEngine Dev Team
- * @copyright Copyright (c) 2008 - 2014, EllisLab, Inc.
- * @license http://codeigniter.com/user_guide/license.html
- * @link http://codeigniter.com
- * @since Version 1.0
+ * This content is released under the MIT License (MIT)
+ *
+ * Copyright (c) 2014 - 2017, British Columbia Institute of Technology
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @package CodeIgniter
+ * @author EllisLab Dev Team
+ * @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
+ * @copyright Copyright (c) 2014 - 2017, British Columbia Institute of Technology (http://bcit.ca/)
+ * @license http://opensource.org/licenses/MIT MIT License
+ * @link https://codeigniter.com
+ * @since Version 2.0.3
* @filesource
*/
-
-// ------------------------------------------------------------------------
+defined('BASEPATH') OR exit('No direct script access allowed');
/**
* SQLSRV 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
- * @link http://codeigniter.com/user_guide/database/
+ * @author EllisLab Dev Team
+ * @link https://codeigniter.com/user_guide/database/
*/
class CI_DB_sqlsrv_driver extends CI_DB {
- var $dbdriver = 'sqlsrv';
-
- // The character used for escaping
- var $_escape_char = '';
-
- // clause and character used for LIKE escape sequences
- var $_like_escape_str = " ESCAPE '%s' ";
- var $_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 $_random_keyword = ' ASC'; // not currently supported
-
/**
- * Non-persistent database connection
+ * Database driver
*
- * @access private called by the base class
- * @return resource
+ * @var string
*/
- function db_connect($pooling = false)
- {
- // Check for a UTF-8 charset being passed as CI's default 'utf8'.
- $character_set = (0 === strcasecmp('utf8', $this->char_set)) ? 'UTF-8' : $this->char_set;
-
- $connection = array(
- 'UID' => empty($this->username) ? '' : $this->username,
- 'PWD' => empty($this->password) ? '' : $this->password,
- 'Database' => $this->database,
- 'ConnectionPooling' => $pooling ? 1 : 0,
- 'CharacterSet' => $character_set,
- 'ReturnDatesAsStrings' => 1
- );
-
- // If the username and password are both empty, assume this is a
- // 'Windows Authentication Mode' connection.
- if(empty($connection['UID']) && empty($connection['PWD'])) {
- unset($connection['UID'], $connection['PWD']);
- }
-
- return sqlsrv_connect($this->hostname, $connection);
- }
-
- // --------------------------------------------------------------------
+ public $dbdriver = 'sqlsrv';
/**
- * Persistent database connection
+ * Scrollable flag
*
- * @access private called by the base class
- * @return resource
- */
- function db_pconnect()
- {
- $this->db_connect(TRUE);
- }
-
- // --------------------------------------------------------------------
-
- /**
- * Reconnect
+ * Determines what cursor type to use when executing queries.
*
- * Keep / reestablish the db connection if no queries have been
- * sent for a length of time exceeding the server's idle timeout
+ * FALSE or SQLSRV_CURSOR_FORWARD would increase performance,
+ * but would disable num_rows() (and possibly insert_id())
*
- * @access public
- * @return void
+ * @var mixed
*/
- function reconnect()
- {
- // not implemented in MSSQL
- }
+ public $scrollable;
// --------------------------------------------------------------------
/**
- * Select the database
+ * ORDER BY random keyword
*
- * @access private called by the base class
- * @return resource
+ * @var array
*/
- function db_select()
- {
- return $this->_execute('USE ' . $this->database);
- }
-
- // --------------------------------------------------------------------
+ protected $_random_keyword = array('NEWID()', 'RAND(%d)');
/**
- * Set client character set
+ * Quoted identifier flag
*
- * @access public
- * @param string
- * @param string
- * @return resource
+ * Whether to use SQL-92 standard quoted identifier
+ * (double quotes) or brackets for identifier escaping.
+ *
+ * @var bool
*/
- function db_set_charset($charset, $collation)
- {
- // @todo - add support if needed
- return TRUE;
- }
+ protected $_quoted_identifier = TRUE;
// --------------------------------------------------------------------
/**
- * Execute the query
+ * Class constructor
*
- * @access private called by the base class
- * @param string an SQL query
- * @return resource
+ * @param array $params
+ * @return void
*/
- function _execute($sql)
+ public function __construct($params)
{
- $sql = $this->_prep_query($sql);
- return sqlsrv_query($this->conn_id, $sql, null, array(
- 'Scrollable' => SQLSRV_CURSOR_STATIC,
- 'SendStreamParamsAtExec' => true
- ));
+ parent::__construct($params);
+
+ // This is only supported as of SQLSRV 3.0
+ if ($this->scrollable === NULL)
+ {
+ $this->scrollable = defined('SQLSRV_CURSOR_CLIENT_BUFFERED')
+ ? SQLSRV_CURSOR_CLIENT_BUFFERED
+ : FALSE;
+ }
}
// --------------------------------------------------------------------
/**
- * Prep the query
+ * Database connection
*
- * If needed, each database adapter can prep the query string
- *
- * @access private called by execute()
- * @param string an SQL query
- * @return string
+ * @param bool $pooling
+ * @return resource
*/
- function _prep_query($sql)
+ public function db_connect($pooling = FALSE)
{
- return $sql;
- }
+ $charset = in_array(strtolower($this->char_set), array('utf-8', 'utf8'), TRUE)
+ ? 'UTF-8' : SQLSRV_ENC_CHAR;
- // --------------------------------------------------------------------
+ $connection = array(
+ 'UID' => empty($this->username) ? '' : $this->username,
+ 'PWD' => empty($this->password) ? '' : $this->password,
+ 'Database' => $this->database,
+ 'ConnectionPooling' => ($pooling === TRUE) ? 1 : 0,
+ 'CharacterSet' => $charset,
+ 'Encrypt' => ($this->encrypt === TRUE) ? 1 : 0,
+ 'ReturnDatesAsStrings' => 1
+ );
- /**
- * Begin Transaction
- *
- * @access public
- * @return bool
- */
- function trans_begin($test_mode = FALSE)
- {
- if ( ! $this->trans_enabled)
+ // If the username and password are both empty, assume this is a
+ // 'Windows Authentication Mode' connection.
+ if (empty($connection['UID']) && empty($connection['PWD']))
{
- return TRUE;
+ unset($connection['UID'], $connection['PWD']);
}
- // When transactions are nested we only begin/commit/rollback the outermost ones
- if ($this->_trans_depth > 0)
+ if (FALSE !== ($this->conn_id = sqlsrv_connect($this->hostname, $connection)))
{
- return TRUE;
+ // Determine how identifiers are escaped
+ $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('[', ']');
}
- // 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;
-
- return sqlsrv_begin_transaction($this->conn_id);
+ return $this->conn_id;
}
// --------------------------------------------------------------------
/**
- * Commit Transaction
+ * Select the database
*
- * @access public
+ * @param string $database
* @return bool
*/
- function trans_commit()
+ public function db_select($database = '')
{
- if ( ! $this->trans_enabled)
+ if ($database === '')
{
- return TRUE;
+ $database = $this->database;
}
- // When transactions are nested we only begin/commit/rollback the outermost ones
- if ($this->_trans_depth > 0)
+ if ($this->_execute('USE '.$this->escape_identifiers($database)))
{
+ $this->database = $database;
+ $this->data_cache = array();
return TRUE;
}
- return sqlsrv_commit($this->conn_id);
+ return FALSE;
}
// --------------------------------------------------------------------
/**
- * Rollback Transaction
+ * Execute the query
*
- * @access public
- * @return bool
+ * @param string $sql an SQL query
+ * @return resource
*/
- function trans_rollback()
+ protected function _execute($sql)
{
- 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;
- }
-
- return sqlsrv_rollback($this->conn_id);
+ return ($this->scrollable === FALSE OR $this->is_write_type($sql))
+ ? sqlsrv_query($this->conn_id, $sql)
+ : sqlsrv_query($this->conn_id, $sql, NULL, array('Scrollable' => $this->scrollable));
}
// --------------------------------------------------------------------
/**
- * Escape String
+ * Begin Transaction
*
- * @access public
- * @param string
- * @param bool whether or not the string will be used in a LIKE condition
- * @return string
+ * @return bool
*/
- function escape_str($str, $like = FALSE)
+ protected function _trans_begin()
{
- // Escape single quotes
- return str_replace("'", "''", $str);
+ return sqlsrv_begin_transaction($this->conn_id);
}
// --------------------------------------------------------------------
/**
- * Affected Rows
+ * Commit Transaction
*
- * @access public
- * @return integer
+ * @return bool
*/
- function affected_rows()
+ protected function _trans_commit()
{
- return @sqlrv_rows_affected($this->conn_id);
+ return sqlsrv_commit($this->conn_id);
}
// --------------------------------------------------------------------
/**
- * Insert ID
- *
- * Returns the last id created in the Identity column.
- *
- * @access public
- * @return integer
- */
- function insert_id()
+ * Rollback Transaction
+ *
+ * @return bool
+ */
+ protected function _trans_rollback()
{
- return $this->query('select @@IDENTITY as insert_id')->row('insert_id');
+ return sqlsrv_rollback($this->conn_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)
+ * Affected Rows
+ *
+ * @return int
+ */
+ public function affected_rows()
{
- preg_match('/([0-9]+)\.([0-9]+)\.([0-9]+)/', $version, $ver_info);
- return $ver_info[1]; // return the major version b/c that's all we're interested in.
+ return sqlsrv_rows_affected($this->result_id);
}
// --------------------------------------------------------------------
/**
- * Version number query string
- *
- * @access public
- * @return string
- */
- function _version()
+ * Insert ID
+ *
+ * Returns the last id created in the Identity column.
+ *
+ * @return string
+ */
+ public function insert_id()
{
- $info = sqlsrv_server_info($this->conn_id);
- return sprintf("select '%s' as ver", $info['SQLServerVersion']);
+ return $this->query('SELECT SCOPE_IDENTITY() AS insert_id')->row()->insert_id;
}
// --------------------------------------------------------------------
/**
- * "Count All" query
- *
- * Generates a platform-specific query string that counts all records in
- * the specified database
+ * Database version number
*
- * @access public
- * @param string
* @return string
*/
- function count_all($table = '')
+ public function version()
{
- if ($table == '')
- return '0';
-
- $query = $this->query("SELECT COUNT(*) AS numrows FROM " . $this->dbprefix . $table);
-
- if ($query->num_rows() == 0)
- return '0';
-
- $row = $query->row();
- $this->_reset_select();
- return $row->numrows;
+ if (isset($this->data_cache['version']))
+ {
+ return $this->data_cache['version'];
+ }
+
+ if ( ! $this->conn_id OR ($info = sqlsrv_server_info($this->conn_id)) === FALSE)
+ {
+ return FALSE;
+ }
+
+ return $this->data_cache['version'] = $info['SQLServerVersion'];
}
// --------------------------------------------------------------------
@@ -355,13 +284,22 @@ class CI_DB_sqlsrv_driver extends CI_DB {
*
* Generates a platform-specific query string so that the table names can be fetched
*
- * @access private
- * @param boolean
- * @return string
+ * @param bool
+ * @return string $prefix_limit
*/
- function _list_tables($prefix_limit = FALSE)
+ protected function _list_tables($prefix_limit = FALSE)
{
- return "SELECT name FROM sysobjects WHERE type = 'U' ORDER BY name";
+ $sql = 'SELECT '.$this->escape_identifiers('name')
+ .' FROM '.$this->escape_identifiers('sysobjects')
+ .' WHERE '.$this->escape_identifiers('type')." = 'U'";
+
+ if ($prefix_limit === TRUE && $this->dbprefix !== '')
+ {
+ $sql .= ' AND '.$this->escape_identifiers('name')." LIKE '".$this->escape_like_str($this->dbprefix)."%' "
+ .sprintf($this->_escape_like_str, $this->_escape_like_chr);
+ }
+
+ return $sql.' ORDER BY '.$this->escape_identifiers('name');
}
// --------------------------------------------------------------------
@@ -371,210 +309,223 @@ class CI_DB_sqlsrv_driver extends CI_DB {
*
* Generates a platform-specific query string so that the column names can be fetched
*
- * @access private
- * @param string the table name
+ * @param string $table
* @return string
*/
- function _list_columns($table = '')
+ protected function _list_columns($table = '')
{
- return "SELECT * FROM INFORMATION_SCHEMA.Columns WHERE TABLE_NAME = '".$this->_escape_table($table)."'";
+ return 'SELECT COLUMN_NAME
+ FROM INFORMATION_SCHEMA.Columns
+ WHERE UPPER(TABLE_NAME) = '.$this->escape(strtoupper($table));
}
// --------------------------------------------------------------------
/**
- * 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
+ * @param string $table
+ * @return array
*/
- function _field_data($table)
+ public function field_data($table)
{
- return "SELECT TOP 1 * FROM " . $this->_escape_table($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));
- /**
- * The error message string
- *
- * @access private
- * @return string
- */
- function _error_message()
- {
- $error = array_shift(sqlsrv_errors());
- return !empty($error['message']) ? $error['message'] : null;
- }
+ if (($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;
+ }
- /**
- * The error message number
- *
- * @access private
- * @return integer
- */
- function _error_number()
- {
- $error = array_shift(sqlsrv_errors());
- return isset($error['SQLSTATE']) ? $error['SQLSTATE'] : null;
+ return $retval;
}
// --------------------------------------------------------------------
/**
- * Escape Table Name
+ * Error
*
- * This function adds backticks if the table name has a period
- * in it. Some DBs will get cranky unless periods are escaped
+ * Returns an array containing code and message of the last
+ * database error that has occurred.
*
- * @access private
- * @param string the table name
- * @return string
+ * @return array
*/
- function _escape_table($table)
+ public function error()
{
- return $table;
- }
-
+ $error = array('code' => '00000', 'message' => '');
+ $sqlsrv_errors = sqlsrv_errors(SQLSRV_ERR_ERRORS);
- /**
- * Escape the SQL Identifiers
- *
- * This function escapes column and table names
- *
- * @access private
- * @param string
- * @return string
- */
- function _escape_identifiers($item)
- {
- return $item;
- }
+ if ( ! is_array($sqlsrv_errors))
+ {
+ return $error;
+ }
- // --------------------------------------------------------------------
+ $sqlsrv_error = array_shift($sqlsrv_errors);
+ if (isset($sqlsrv_error['SQLSTATE']))
+ {
+ $error['code'] = isset($sqlsrv_error['code']) ? $sqlsrv_error['SQLSTATE'].'/'.$sqlsrv_error['code'] : $sqlsrv_error['SQLSTATE'];
+ }
+ elseif (isset($sqlsrv_error['code']))
+ {
+ $error['code'] = $sqlsrv_error['code'];
+ }
- /**
- * From Tables
- *
- * This function implicitly groups FROM tables so there is no confusion
- * about operator precedence in harmony with SQL standards
- *
- * @access public
- * @param type
- * @return type
- */
- function _from_tables($tables)
- {
- if ( ! is_array($tables))
+ if (isset($sqlsrv_error['message']))
{
- $tables = array($tables);
+ $error['message'] = $sqlsrv_error['message'];
}
- return implode(', ', $tables);
+ return $error;
}
// --------------------------------------------------------------------
/**
- * Insert statement
+ * Update statement
*
- * Generates a platform-specific insert string from the supplied data
+ * Generates a platform-specific update string from the supplied data
*
- * @access public
- * @param string the table name
- * @param array the insert keys
- * @param array the insert values
+ * @param string $table
+ * @param array $values
* @return string
*/
- function _insert($table, $keys, $values)
- {
- return "INSERT INTO ".$this->_escape_table($table)." (".implode(', ', $keys).") VALUES (".implode(', ', $values).")";
+ protected function _update($table, $values)
+ {
+ $this->qb_limit = FALSE;
+ $this->qb_orderby = array();
+ return parent::_update($table, $values);
}
// --------------------------------------------------------------------
/**
- * Update statement
+ * Truncate statement
*
- * Generates a platform-specific update string from the supplied data
+ * Generates a platform-specific truncate 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
+ * If the database does not support the TRUNCATE statement,
+ * then this method maps to 'DELETE FROM table'
+ *
+ * @param string $table
* @return string
*/
- function _update($table, $values, $where)
+ protected function _truncate($table)
{
- foreach($values as $key => $val)
- {
- $valstr[] = $key." = ".$val;
- }
-
- return "UPDATE ".$this->_escape_table($table)." SET ".implode(', ', $valstr)." WHERE ".implode(" ", $where);
+ return 'TRUNCATE TABLE '.$table;
}
-
+
// --------------------------------------------------------------------
/**
- * Truncate statement
+ * Delete 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"
+ * Generates a platform-specific delete string from the supplied data
*
- * @access public
- * @param string the table name
+ * @param string $table
* @return string
*/
- function _truncate($table)
+ protected function _delete($table)
{
- return "TRUNCATE TABLE ".$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);
}
// --------------------------------------------------------------------
/**
- * Delete statement
+ * LIMIT
*
- * Generates a platform-specific delete string from the supplied data
+ * Generates a platform-specific LIMIT clause
*
- * @access public
- * @param string the table name
- * @param array the where clause
- * @param string the limit clause
+ * @param string $sql SQL Query
* @return string
*/
- function _delete($table, $where)
+ protected function _limit($sql)
{
- return "DELETE FROM ".$this->_escape_table($table)." WHERE ".implode(" ", $where);
+ // As of SQL Server 2012 (11.0.*) OFFSET is supported
+ if (version_compare($this->version(), '11', '>='))
+ {
+ // SQL Server OFFSET-FETCH can be used only with the ORDER BY clause
+ empty($this->qb_orderby) && $sql .= ' ORDER BY 1';
+
+ return $sql.' OFFSET '.(int) $this->qb_offset.' ROWS FETCH NEXT '.$this->qb_limit.' ROWS ONLY';
+ }
+
+ $limit = $this->qb_offset + $this->qb_limit;
+
+ // An ORDER BY clause is required for ROW_NUMBER() to work
+ if ($this->qb_offset && ! empty($this->qb_orderby))
+ {
+ $orderby = $this->_compile_order_by();
+
+ // We have to strip the ORDER BY clause
+ $sql = trim(substr($sql, 0, strrpos($sql, $orderby)));
+
+ // Get the fields to select from our subquery, so that we can avoid CI_rownum appearing in the actual results
+ if (count($this->qb_select) === 0)
+ {
+ $select = '*'; // Inevitable
+ }
+ else
+ {
+ // Use only field names and their aliases, everything else is out of our scope.
+ $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);
}
// --------------------------------------------------------------------
/**
- * Limit string
+ * Insert batch statement
*
- * Generates a platform-specific LIMIT clause
+ * Generates a platform-specific insert string from the supplied data.
*
- * @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
+ * @param string $table Table name
+ * @param array $keys INSERT keys
+ * @param array $values INSERT values
+ * @return string|bool
*/
- function _limit($sql, $limit, $offset)
+ protected function _insert_batch($table, $keys, $values)
{
- $i = $limit + $offset;
-
- return preg_replace('/(^\SELECT (DISTINCT)?)/i','\\1 TOP '.$i.' ', $sql);
+ // Multiple-value inserts are only supported as of SQL Server 2008
+ if (version_compare($this->version(), '10', '>='))
+ {
+ return parent::_insert_batch($table, $keys, $values);
+ }
+
+ return ($this->db_debug) ? $this->display_error('db_unsupported_feature') : FALSE;
}
// --------------------------------------------------------------------
@@ -582,18 +533,11 @@ class CI_DB_sqlsrv_driver extends CI_DB {
/**
* Close DB Connection
*
- * @access public
- * @param resource
* @return void
*/
- function _close($conn_id)
+ protected function _close()
{
- @sqlsrv_close($conn_id);
+ sqlsrv_close($this->conn_id);
}
}
-
-
-
-/* End of file mssql_driver.php */
-/* Location: ./system/database/drivers/mssql/mssql_driver.php */ \ No newline at end of file