diff options
Diffstat (limited to 'system/database/drivers/mssql/mssql_driver.php')
| -rw-r--r-- | system/database/drivers/mssql/mssql_driver.php | 677 |
1 files changed, 264 insertions, 413 deletions
diff --git a/system/database/drivers/mssql/mssql_driver.php b/system/database/drivers/mssql/mssql_driver.php index 1823edce8..a2ccd1c80 100644 --- a/system/database/drivers/mssql/mssql_driver.php +++ b/system/database/drivers/mssql/mssql_driver.php @@ -1,648 +1,506 @@ -<?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 1.3.0 * @filesource */ - -// ------------------------------------------------------------------------ +defined('BASEPATH') OR exit('No direct script access allowed'); /** * MS SQL 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_mssql_driver extends CI_DB { - var $dbdriver = 'mssql'; - - // 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 $_random_keyword = ' ASC'; // not currently supported - /** - * Non-persistent database connection + * Database driver * - * @access private called by the base class - * @return resource + * @var string */ - function db_connect() - { - if ($this->port != '') - { - $this->hostname .= ','.$this->port; - } - - return @mssql_connect($this->hostname, $this->username, $this->password); - } + public $dbdriver = 'mssql'; // -------------------------------------------------------------------- /** - * Persistent database connection + * ORDER BY random keyword * - * @access private called by the base class - * @return resource + * @var array */ - function db_pconnect() - { - if ($this->port != '') - { - $this->hostname .= ','.$this->port; - } - - return @mssql_pconnect($this->hostname, $this->username, $this->password); - } - - // -------------------------------------------------------------------- + protected $_random_keyword = array('NEWID()', 'RAND(%d)'); /** - * Reconnect + * Quoted identifier flag * - * Keep / reestablish the db connection if no queries have been - * sent for a length of time exceeding the server's idle timeout + * Whether to use SQL-92 standard quoted identifier + * (double quotes) or brackets for identifier escaping. * - * @access public - * @return void + * @var bool */ - function reconnect() - { - // not implemented in MSSQL - } + protected $_quoted_identifier = TRUE; // -------------------------------------------------------------------- /** - * Select the database + * Class constructor * - * @access private called by the base class - * @return resource - */ - function db_select() - { - // Note: The brackets are required in the event that the DB name - // contains reserved characters - return @mssql_select_db('['.$this->database.']', $this->conn_id); - } - - // -------------------------------------------------------------------- - - /** - * Set client character set + * Appends the port number to the hostname, if needed. * - * @access public - * @param string - * @param string - * @return resource + * @param array $params + * @return void */ - function db_set_charset($charset, $collation) + public function __construct($params) { - // @todo - add support if needed - return TRUE; - } + parent::__construct($params); - // -------------------------------------------------------------------- - - /** - * Execute the query - * - * @access private called by the base class - * @param string an SQL query - * @return resource - */ - function _execute($sql) - { - $sql = $this->_prep_query($sql); - return @mssql_query($sql, $this->conn_id); + if ( ! empty($this->port)) + { + $this->hostname .= (DIRECTORY_SEPARATOR === '\\' ? ',' : ':').$this->port; + } } // -------------------------------------------------------------------- /** - * Prep the query - * - * If needed, each database adapter can prep the query string + * Non-persistent database connection * - * @access private called by execute() - * @param string an SQL query - * @return string + * @param bool $persistent + * @return resource */ - function _prep_query($sql) + public function db_connect($persistent = FALSE) { - return $sql; - } - - // -------------------------------------------------------------------- + $this->conn_id = ($persistent) + ? mssql_pconnect($this->hostname, $this->username, $this->password) + : mssql_connect($this->hostname, $this->username, $this->password); - /** - * Begin Transaction - * - * @access public - * @return bool - */ - function trans_begin($test_mode = FALSE) - { - if ( ! $this->trans_enabled) + if ( ! $this->conn_id) { - return TRUE; + return FALSE; } - // When transactions are nested we only begin/commit/rollback the outermost ones - if ($this->_trans_depth > 0) + // ---------------------------------------------------------------- + + // Select the DB... assuming a database name is specified in the config file + if ($this->database !== '' && ! $this->db_select()) { - return TRUE; + log_message('error', 'Unable to select database: '.$this->database); + + return ($this->db_debug === TRUE) + ? $this->display_error('db_unable_to_select', $this->database) + : FALSE; } - // 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; + // 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('[', ']'); - $this->simple_query('BEGIN TRAN'); - return TRUE; + 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) + // Note: Escaping is required in the event that the DB name + // contains reserved characters. + if (mssql_select_db('['.$database.']', $this->conn_id)) { + $this->database = $database; + $this->data_cache = array(); return TRUE; } - $this->simple_query('COMMIT TRAN'); - return TRUE; + return FALSE; } // -------------------------------------------------------------------- /** - * Rollback Transaction + * Execute the query * - * @access public - * @return bool + * @param string $sql an SQL query + * @return mixed resource if rows are returned, bool otherwise */ - function trans_rollback() + protected function _execute($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; - } - - $this->simple_query('ROLLBACK TRAN'); - return TRUE; + return mssql_query($sql, $this->conn_id); } // -------------------------------------------------------------------- /** - * Escape String + * Begin Transaction * - * @access public - * @param string - * @param bool whether or not the string will be used in a LIKE condition - * @return string + * @return bool */ - function escape_str($str, $like = FALSE) + protected function _trans_begin() { - if (is_array($str)) - { - foreach ($str as $key => $val) - { - $str[$key] = $this->escape_str($val, $like); - } - - return $str; - } - - // Escape single quotes - $str = str_replace("'", "''", remove_invisible_characters($str)); - - // escape LIKE condition wildcards - if ($like === TRUE) - { - $str = str_replace( - array($this->_like_escape_chr, '%', '_'), - array($this->_like_escape_chr.$this->_like_escape_chr, $this->_like_escape_chr.'%', $this->_like_escape_chr.'_'), - $str - ); - } - - return $str; + return $this->simple_query('BEGIN TRAN'); } // -------------------------------------------------------------------- /** - * Affected Rows + * Commit Transaction * - * @access public - * @return integer + * @return bool */ - function affected_rows() + protected function _trans_commit() { - return @mssql_rows_affected($this->conn_id); + return $this->simple_query('COMMIT TRAN'); } // -------------------------------------------------------------------- /** - * 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) + * Rollback Transaction + * + * @return bool + */ + protected function _trans_rollback() { - 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 $this->simple_query('ROLLBACK TRAN'); } // -------------------------------------------------------------------- /** - * Version number query string - * - * @access public - * @return string - */ - function _version() + * Affected Rows + * + * @return int + */ + public function affected_rows() { - return "SELECT @@VERSION AS ver"; + return mssql_rows_affected($this->conn_id); } // -------------------------------------------------------------------- /** - * "Count All" query + * Insert ID * - * Generates a platform-specific query string that counts all records in - * the specified database + * Returns the last id created in the Identity column. * - * @access public - * @param string * @return string */ - function count_all($table = '') + public function insert_id() { - if ($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; - } + $query = version_compare($this->version(), '8', '>=') + ? 'SELECT SCOPE_IDENTITY() AS last_id' + : 'SELECT @@IDENTITY AS last_id'; - $row = $query->row(); - $this->_reset_select(); - return (int) $row->numrows; + $query = $this->query($query); + $query = $query->row(); + return $query->last_id; } // -------------------------------------------------------------------- /** - * List table query - * - * Generates a platform-specific query string so that the table names can be fetched + * Set client character set * - * @access private - * @param boolean - * @return string + * @param string $charset + * @return bool */ - function _list_tables($prefix_limit = FALSE) + protected function _db_set_charset($charset) { - $sql = "SELECT name FROM sysobjects WHERE type = 'U' ORDER BY name"; - - // for future compatibility - if ($prefix_limit !== FALSE AND $this->dbprefix != '') - { - //$sql .= " LIKE '".$this->escape_like_str($this->dbprefix)."%' ".sprintf($this->_like_escape_str, $this->_like_escape_chr); - return FALSE; // not currently supported - } - - return $sql; + return (ini_set('mssql.charset', $charset) !== FALSE); } // -------------------------------------------------------------------- /** - * List column query - * - * Generates a platform-specific query string so that the column names can be fetched + * Version number query string * - * @access private - * @param string the table name * @return string */ - function _list_columns($table = '') + protected function _version() { - return "SELECT * FROM INFORMATION_SCHEMA.Columns WHERE TABLE_NAME = '".$table."'"; + return "SELECT SERVERPROPERTY('ProductVersion') AS ver"; } // -------------------------------------------------------------------- /** - * Field data query + * List table query * - * Generates a platform-specific query so that the column data can be retrieved + * Generates a platform-specific query string so that the table names can be fetched * - * @access public - * @param string the table name - * @return object + * @param bool $prefix_limit + * @return string */ - function _field_data($table) + protected function _list_tables($prefix_limit = FALSE) { - return "SELECT TOP 1 * FROM ".$table; - } + $sql = 'SELECT '.$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); + } - /** - * The error message string - * - * @access private - * @return string - */ - function _error_message() - { - return mssql_get_last_message(); + return $sql.' ORDER BY '.$this->escape_identifiers('name'); } // -------------------------------------------------------------------- /** - * The error message number + * List column query + * + * Generates a platform-specific query string so that the column names can be fetched * - * @access private - * @return integer + * @param string $table + * @return string */ - function _error_number() + protected function _list_columns($table = '') { - // Are error numbers supported? - return ''; + return 'SELECT COLUMN_NAME + FROM INFORMATION_SCHEMA.Columns + WHERE UPPER(TABLE_NAME) = '.$this->escape(strtoupper($table)); } // -------------------------------------------------------------------- /** - * Escape the SQL Identifiers - * - * This function escapes column and table names + * Returns an object with field data * - * @access private - * @param string - * @return string + * @param string $table + * @return array */ - function _escape_identifiers($item) + public function field_data($table) { - if ($this->_escape_char == '') - { - return $item; - } + $sql = 'SELECT COLUMN_NAME, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH, NUMERIC_PRECISION, COLUMN_DEFAULT + FROM INFORMATION_SCHEMA.Columns + WHERE UPPER(TABLE_NAME) = '.$this->escape(strtoupper($table)); - foreach ($this->_reserved_identifiers as $id) + if (($query = $this->query($sql)) === FALSE) { - if (strpos($item, '.'.$id) !== FALSE) - { - $str = $this->_escape_char. str_replace('.', $this->_escape_char.'.', $item); - - // remove duplicates if the user already included the escape - return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str); - } + return FALSE; } + $query = $query->result_object(); - if (strpos($item, '.') !== FALSE) - { - $str = $this->_escape_char.str_replace('.', $this->_escape_char.'.'.$this->_escape_char, $item).$this->_escape_char; - } - else + $retval = array(); + for ($i = 0, $c = count($query); $i < $c; $i++) { - $str = $this->_escape_char.$item.$this->_escape_char; + $retval[$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; } - // remove duplicates if the user already included the escape - return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str); + return $retval; } // -------------------------------------------------------------------- /** - * From Tables + * Error * - * This function implicitly groups FROM tables so there is no confusion - * about operator precedence in harmony with SQL standards + * Returns an array containing code and message of the last + * database error that has occurred. * - * @access public - * @param type - * @return type + * @return array */ - function _from_tables($tables) + public function error() { - if ( ! is_array($tables)) + // We need this because the error info is discarded by the + // server the first time you request it, and query() already + // calls error() once for logging purposes when a query fails. + static $error = array('code' => 0, 'message' => NULL); + + $message = mssql_get_last_message(); + if ( ! empty($message)) { - $tables = array($tables); + $error['code'] = $this->query('SELECT @@ERROR AS code')->row()->code; + $error['message'] = $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, $values) + protected function _update($table, $values) { - return "INSERT INTO ".$table." (".implode(', ', $keys).") VALUES (".implode(', ', $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 + * + * If the database does not support the TRUNCATE statement, + * then this method maps to 'DELETE FROM table' * - * @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 + * @param string $table * @return string */ - function _update($table, $values, $where, $orderby = array(), $limit = FALSE) + protected function _truncate($table) { - foreach ($values as $key => $val) - { - $valstr[] = $key." = ".$val; - } - - $limit = ( ! $limit) ? '' : ' LIMIT '.$limit; - - $orderby = (count($orderby) >= 1)?' ORDER BY '.implode(", ", $orderby):''; - - $sql = "UPDATE ".$table." SET ".implode(', ', $valstr); - - $sql .= ($where != '' AND count($where) >=1) ? " WHERE ".implode(" ", $where) : ''; - - $sql .= $orderby.$limit; - - return $sql; + return 'TRUNCATE TABLE '.$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; + 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 = array(), $like = array(), $limit = FALSE) + protected function _limit($sql) { - $conditions = ''; + $limit = $this->qb_offset + $this->qb_limit; - if (count($where) > 0 OR count($like) > 0) + // As of SQL Server 2005 (9.0.*) ROW_NUMBER() is supported, + // however an ORDER BY clause is required for it to work + if (version_compare($this->version(), '9', '>=') && $this->qb_offset && ! empty($this->qb_orderby)) { - $conditions = "\nWHERE "; - $conditions .= implode("\n", $this->ar_where); + $orderby = $this->_compile_order_by(); - if (count($where) > 0 && count($like) > 0) + // 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) { - $conditions .= " AND "; + $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); } - $conditions .= implode("\n", $like); - } - $limit = ( ! $limit) ? '' : ' LIMIT '.$limit; + 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 '.$limit; + } - return "DELETE FROM ".$table.$conditions.$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 + $offset; + // Multiple-value inserts are only supported as of SQL Server 2008 + if (version_compare($this->version(), '10', '>=')) + { + return parent::_insert_batch($table, $keys, $values); + } - return preg_replace('/(^\SELECT (DISTINCT)?)/i','\\1 TOP '.$i.' ', $sql); + return ($this->db_debug) ? $this->display_error('db_unsupported_feature') : FALSE; } // -------------------------------------------------------------------- @@ -650,18 +508,11 @@ class CI_DB_mssql_driver extends CI_DB { /** * Close DB Connection * - * @access public - * @param resource * @return void */ - function _close($conn_id) + protected function _close() { - @mssql_close($conn_id); + mssql_close($this->conn_id); } } - - - -/* End of file mssql_driver.php */ -/* Location: ./system/database/drivers/mssql/mssql_driver.php */
\ No newline at end of file |