<?php
/**
*
* This file is part of the phpBB Forum Software package.
*
* @copyright (c) phpBB Limited <https://www.phpbb.com>
* @license GNU General Public License, version 2 (GPL-2.0)
*
* For full copyright and license information, please see
* the docs/CREDITS.txt file.
*
*/
namespace phpbb\db\tools;
/**
* Database Tools for handling cross-db actions such as altering columns, etc.
* Currently not supported is returning SQL for creating tables.
*/
class mssql extends tools
{
/**
* Is the used MS SQL Server a SQL Server 2000?
* @var bool
*/
protected $is_sql_server_2000;
/**
* Get the column types for mssql based databases
*
* @return array
*/
static public function get_dbms_type_map()
{
return array(
'mssql' => array(
'INT:' => '[int]',
'BINT' => '[float]',
'ULINT' => '[int]',
'UINT' => '[int]',
'UINT:' => '[int]',
'TINT:' => '[int]',
'USINT' => '[int]',
'BOOL' => '[int]',
'VCHAR' => '[varchar] (255)',
'VCHAR:' => '[varchar] (%d)',
'CHAR:' => '[char] (%d)',
'XSTEXT' => '[varchar] (1000)',
'STEXT' => '[varchar] (3000)',
'TEXT' => '[varchar] (8000)',
'MTEXT' => '[text]',
'XSTEXT_UNI'=> '[nvarchar] (100)',
'STEXT_UNI' => '[nvarchar] (255)',
'TEXT_UNI' => '[nvarchar] (4000)',
'MTEXT_UNI' => '[ntext]',
'TIMESTAMP' => '[int]',
'DECIMAL' => '[float]',
'DECIMAL:' => '[float]',
'PDECIMAL' => '[float]',
'PDECIMAL:' => '[float]',
'VCHAR_UNI' => '[nvarchar] (255)',
'VCHAR_UNI:'=> '[nvarchar] (%d)',
'VCHAR_CI' => '[nvarchar] (255)',
'VARBINARY' => '[varchar] (255)',
),
'mssqlnative' => array(
'INT:' => '[int]',
'BINT' => '[float]',
'ULINT' => '[int]',
'UINT' => '[int]',
'UINT:' => '[int]',
'TINT:' => '[int]',
'USINT' => '[int]',
'BOOL' => '[int]',
'VCHAR' => '[varchar] (255)',
'VCHAR:' => '[varchar] (%d)',
'CHAR:' => '[char] (%d)',
'XSTEXT' => '[varchar] (1000)',
'STEXT' => '[varchar] (3000)',
'TEXT' => '[varchar] (8000)',
'MTEXT' => '[text]',
'XSTEXT_UNI'=> '[nvarchar] (100)',
'STEXT_UNI' => '[nvarchar] (255)',
'TEXT_UNI' => '[nvarchar] (4000)',
'MTEXT_UNI' => '[ntext]',
'TIMESTAMP' => '[int]',
'DECIMAL' => '[float]',
'DECIMAL:' => '[float]',
'PDECIMAL' => '[float]',
'PDECIMAL:' => '[float]',
'VCHAR_UNI' => '[nvarchar] (255)',
'VCHAR_UNI:'=> '[nvarchar] (%d)',
'VCHAR_CI' => '[nvarchar] (255)',
'VARBINARY' => '[varchar] (255)',
),
);
}
/**
* Constructor. Set DB Object and set {@link $return_statements return_statements}.
*
* @param \phpbb\db\driver\driver_interface $db Database connection
* @param bool $return_statements True if only statements should be returned and no SQL being executed
*/
public function __construct(\phpbb\db\driver\driver_interface $db, $return_statements = false)
{
parent::__construct($db, $return_statements);
// Determine mapping database type
switch ($this->db->get_sql_layer())
{
case 'mssql_odbc':
$this->sql_layer = 'mssql';
break;
case 'mssqlnative':
$this->sql_layer = 'mssqlnative';
break;
}
$this->dbms_type_map = self::get_dbms_type_map();
}
/**
* {@inheritDoc}
*/
function sql_list_tables()
{
$sql = "SELECT name
FROM sysobjects
WHERE type='U'";
$result = $this->db->sql_query($sql);
$tables = array();
while ($row = $this->db->sql_fetchrow($result))
{
$name = current($row);
$tables[$name] = $name;
}
$this->db->sql_freeresult($result);
return $tables;
}
/**
* {@inheritDoc}
*/
function sql_create_table($table_name, $table_data)
{
// holds the DDL for a column
$columns = $statements = array();
if ($this->sql_table_exists($table_name))
{
return $this->_sql_run_sql($statements);
}
// Begin transaction
$statements[] = 'begin';
// Determine if we have created a PRIMARY KEY in the earliest
$primary_key_gen = false;
// Determine if the table requires a sequence
$create_sequence = false;
// Begin table sql statement
$table_sql = 'CREATE TABLE [' . $table_name . '] (' . "\n";
if (!isset($table_data['PRIMARY_KEY']))
{
$table_data['COLUMNS']['mssqlindex'] = array('UINT', null, 'auto_increment');
$table_data['PRIMARY_KEY'] = 'mssqlindex';
}
// Iterate through the columns to create a table
foreach ($table_data['COLUMNS'] as $column_name => $column_data)
{
// here lies an array, filled with information compiled on the column's data
$prepared_column = $this->sql_prepare_column_data($table_name, $column_name, $column_data);
if (isset($prepared_column['auto_increment']) && $prepared_column['auto_increment'] && strlen($column_name) > 26) // "${column_name}_gen"
{
trigger_error("Index name '${column_name}_gen' on table '$table_name' is too long. The maximum auto increment column length is 26 characters.", E_USER_ERROR);
}
// here we add the definition of the new column to the list of columns
$columns[] = "\t [{$column_name}] " . $prepared_column['column_type_sql_default'];
// see if we have found a primary key set due to a column definition if we have found it, we can stop looking
if (!$primary_key_gen)
{
$primary_key_gen = isset($prepared_column['primary_key_set']) && $prepared_column['primary_key_set'];
}
// create sequence DDL based off of the existence of auto incrementing columns
if (!$create_sequence && isset($prepared_column['auto_increment']) && $prepared_column['auto_increment'])
{
$create_sequence = $column_name;
}
}
// this makes up all the columns in the create table statement
$table_sql .= implode(",\n", $columns);
// Close the table for two DBMS and add to the statements
$table_sql .= "\n);";
$statements[] = $table_sql;
// we have yet to create a primary key for this table,
// this means that we can add the one we really wanted instead
if (!$primary_key_gen)
{
// Write primary key
if (isset($table_data['PRIMARY_KEY']))
{
if (!is_array($table_data['PRIMARY_KEY']))
{
$table_data['PRIMARY_KEY'] = array($table_data['PRIMARY_KEY']);
}
// We need the data here
$old_return_statements = $this->return_statements;
$this->return_statements = true;
$primary_key_stmts = $this->sql_create_primary_key($table_name, $table_data['PRIMARY_KEY']);
foreach ($primary_key_stmts as $pk_stmt)
{
$statements[] = $pk_stmt;
}
$this->return_statements = $old_return_statements;
}
}
// Write Keys
if (isset($table_data['KEYS']))
{
foreach ($table_data['KEYS'] as $key_name => $key_data)
{
if (!is_array($key_data[1]))
{
$key_data[1] = array($key_data[1]);
}
$old_return_statements = $this->return_statements;
$this->return_statements = true;
$key_stmts = ($key_data[0] == 'UNIQUE') ? $this->sql_create_unique_index($table_name, $key_name, $key_data[1]) : $this->sql_create_index($table_name, $key_name, $key_data[1]);
foreach ($key_stmts as $key_stmt)
{
$statements[] = $key_stmt;
}
$this->return_statements = $old_return_statements;
}
}
// Commit Transaction
$statements[] = 'commit';
return $this->_sql_run_sql($statements);
}
/**
* {@inheritDoc}
*/
function sql_list_columns($table_name)
{
$columns = array();
$sql = "SELECT c.name
FROM syscolumns c
LEFT JOIN sysobjects o ON c.id = o.id
WHERE o.name = '{$table_name}'";
$result = $this->db->sql_query($sql);
while ($row = $this->db->sql_fetchrow($result))
{
$column = strtolower(current($row));
$columns[$column] = $column;
}
$this->db->sql_freeresult($result);
return $columns;
}
/**
* {@inheritDoc}
*/
function sql_index_exists($table_name, $index_name)
{
$sql = "EXEC sp_statistics '$table_name'";
$result = $this->db->sql_query($sql);
while ($row = $this->db->sql_fetchrow($result))
{
if ($row['TYPE'] == 3)
{
if (strtolower($row['INDEX_NAME']) == strtolower($index_name))
{
$this->db->sql_freeresult($result);
return true;
}
}
}
$this->db->sql_freeresult($result);
return false;
}
/**
* {@inheritDoc}
*/
function sql_unique_index_exists($table_name, $index_name)
{
$sql = "EXEC sp_statistics '$table_name'";
$result = $this->db->sql_query($sql);
while ($row = $this->db->sql_fetchrow($result))
{
// Usually NON_UNIQUE is the column we want to check, but we allow for both
if ($row['TYPE'] == 3)
{
if (strtolower($row['INDEX_NAME']) == strtolower($index_name))
{
$this->db->sql_freeresult($result);
return true;
}
}
}
$this->db->sql_freeresult($result);
return false;
}
/**
* {@inheritDoc}
*/
function sql_prepare_column_data($table_name, $column_name, $column_data)
{
if (strlen($column_name) > 30)
{
trigger_error("Column name '$column_name' on table '$table_name' is too long. The maximum is 30 characters.", E_USER_ERROR);
}
// Get type
list($column_type, ) = $this->get_column_type($column_data[0]);
// Adjust default value if db-dependent specified
if (is_array($column_data[1]))
{
$column_data[1] = (isset($column_data[1][$this->sql_layer])) ? $column_data[1][$this->sql_layer] : $column_data[1]['default'];
}
$sql = '';
$return_array = array();
$sql .= " {$column_type} ";
$sql_default = " {$column_type} ";
// For adding columns we need the default definition
if (!is_null($column_data[1]))
{
// For hexadecimal values do not use single quotes
if (strpos($column_data[1], '0x') === 0)
{
$return_array['default'] = 'DEFAULT (' . $column_data[1] . ') ';
$sql_default .= $return_array['default'];
}
else
{
$return_array['default'] = 'DEFAULT (' . ((is_numeric($column_data[1])) ? $column_data[1] : "'{$column_data[1]}'") . ') ';
$sql_default .= $return_array['default'];
}
}
if (isset($column_data[2]) && $column_data[2] == 'auto_increment')
{
// $sql .= 'IDENTITY (1, 1) ';
$sql_default .= 'IDENTITY (1, 1) ';
}
$return_array['textimage'] = $column_type === '[text]';
if (!is_null($column_data[1]) || (isset($column_data[2]) && $column_data[2] == 'auto_increment'))
{
$sql .= 'NOT NULL';
$sql_default .= 'NOT NULL';
}
else
{
$sql .= 'NULL';
$sql_default .= 'NULL';
}
$return_array['column_type_sql_default'] = $sql_default;
$return_array['column_type_sql'] = $sql;
return $return_array;
}
/**
* {@inheritDoc}
*/
function sql_column_add($table_name, $column_name, $column_data, $inline = false)
{
$column_data = $this->sql_prepare_column_data($table_name, $column_name, $column_data);
$statements = array();
// Does not support AFTER, only through temporary table
$statements[] = 'ALTER TABLE [' . $table_name . '] ADD [' . $column_name . '] ' . $column_data['column_type_sql_default'];
return $this->_sql_run_sql($statements);
}
/**
* {@inheritDoc}
*/
function sql_column_remove($table_name, $column_name, $inline = false)
{
$statements = array();
// We need the data here
$old_return_statements = $this->return_statements;
$this->return_statements = true;
$indexes = $this->get_existing_indexes($table_name, $column_name);
$indexes = array_merge($indexes, $this->get_existing_indexes($table_name, $column_name, true));
// Drop any indexes
$recreate_indexes = array();
if (!empty($indexes))
{
foreach ($indexes as $index_name => $index_data)
{
$result = $this->sql_index_drop($table_name, $index_name);
$statements = array_merge($statements, $result);
if (count($index_data) > 1)
{
// Remove this column from the index and recreate it
$recreate_indexes[$index_name] = array_diff($index_data, array($column_name));
}
}
}
// Drop primary keys depending on this column
$result = $this->mssql_get_drop_default_primary_key_queries($table_name, $column_name);
$statements = array_merge($statements, $result);
// Drop default value constraint
$result = $this->mssql_get_drop_default_constraints_queries($table_name, $column_name);
$statements = array_merge($statements, $result);
// Remove the column
$statements[] = 'ALTER TABLE [' . $table_name . '] DROP COLUMN [' . $column_name . ']';
if (!empty($recreate_indexes))
{
// Recreate indexes after we removed the column
foreach ($recreate_indexes as $index_name => $index_data)
{
$result = $this->sql_create_index($table_name, $index_name, $index_data);
$statements = array_merge($statements, $result);
}
}
$this->return_statements = $old_return_statements;
return $this->_sql_run_sql($statements);
}
/**
* {@inheritDoc}
*/
function sql_index_drop($table_name, $index_name)
{
$statements = array();
$statements[] = 'DROP INDEX [' . $table_name . '].[' . $index_name . ']';
return $this->_sql_run_sql($statements);
}
/**
* {@inheritDoc}
*/
function sql_table_drop($table_name)
{
$statements = array();
if (!$this->sql_table_exists($table_name))
{
return $this->_sql_run_sql($statements);
}
// the most basic operation, get rid of the table
$statements[] = 'DROP TABLE ' . $table_name;
return $this->_sql_run_sql($statements);
}
/**
* {@inheritDoc}
*/
function sql_create_primary_key($table_name, $column, $inline = false)
{
$statements = array();
$sql = "ALTER TABLE [{$table_name}] WITH NOCHECK ADD ";
$sql .= "CONSTRAINT [PK_{$table_name}] PRIMARY KEY CLUSTERED (";
$sql .= '[' . implode("],\n\t\t[", $column) . ']';
$sql .= ')';
$statements[] = $sql;
return $this->_sql_run_sql($statements);
}
/**
* {@inheritDoc}
*/
function sql_create_unique_index($table_name, $index_name, $column)
{
$statements = array();
if ($this->mssql_is_sql_server_2000())
{
$this->check_index_name_length($table_name, $index_name);
}
$statements[] = 'CREATE UNIQUE INDEX [' . $index_name . '] ON [' . $table_name . ']([' . implode('], [', $column) . '])';
return $this->_sql_run_sql($statements);
}
/**
* {@inheritDoc}
*/
function sql_create_index($table_name, $index_name, $column)
{
$statements = array();
$this->check_index_name_length($table_name, $index_name);
// remove index length
$column = preg_replace('#:.*$#', '', $column);
$statements[] = 'CREATE INDEX [' . $index_name . '] ON [' . $table_name . ']([' . implode('], [', $column) . '])';
return $this->_sql_run_sql($statements);
}
/**
* {@inheritdoc}
*/
protected function get_max_index_name_length()
{
if ($this->mssql_is_sql_server_2000())
{
return parent::get_max_index_name_length();
}
else
{
return 128;
}
}
/**
* {@inheritDoc}
*/
function sql_list_index($table_name)
{
$index_array = array();
$sql = "EXEC sp_statistics '$table_name'";
$result = $this->db->sql_query($sql);
while ($row = $this->db->sql_fetchrow($result))
{
if ($row['TYPE'] == 3)
{
$index_array[] = strtolower($row['INDEX_NAME']);
}
}
$this->db->sql_freeresult($result);
return $index_array;
}
/**
* {@inheritDoc}
*/
function sql_column_change($table_name, $column_name, $column_data, $inline = false)
{
$column_data = $this->sql_prepare_column_data($table_name, $column_name, $column_data);
$statements = array();
// We need the data here
$old_return_statements = $this->return_statements;
$this->return_statements = true;
$indexes = $this->get_existing_indexes($table_name, $column_name);
$unique_indexes = $this->get_existing_indexes($table_name, $column_name, true);
// Drop any indexes
if (!empty($indexes) || !empty($unique_indexes))
{
$drop_indexes = array_merge(array_keys($indexes), array_keys($unique_indexes));
foreach ($drop_indexes as $index_name)
{
$result = $this->sql_index_drop($table_name, $index_name);
$statements = array_merge($statements, $result);
}
}
// Drop default value constraint
$result = $this->mssql_get_drop_default_constraints_queries($table_name, $column_name);
$statements = array_merge($statements, $result);
// Change the column
$statements[] = 'ALTER TABLE [' . $table_name . '] ALTER COLUMN [' . $column_name . '] ' . $column_data['column_type_sql'];
if (!empty($column_data['default']) && !$this->mssql_is_column_identity($table_name, $column_name))
{
// Add new default value constraint
$statements[] = 'ALTER TABLE [' . $table_name . '] ADD CONSTRAINT [DF_' . $table_name . '_' . $column_name . '_1] ' . $column_data['default'] . ' FOR [' . $column_name . ']';
}
if (!empty($indexes))
{
// Recreate indexes after we changed the column
foreach ($indexes as $index_name => $index_data)
{
$result = $this->sql_create_index($table_name, $index_name, $index_data);
$statements = array_merge($statements, $result);
}
}
if (!empty($unique_indexes))
{
// Recreate unique indexes after we changed the column
foreach ($unique_indexes as $index_name => $index_data)
{
$result = $this->sql_create_unique_index($table_name, $index_name, $index_data);
$statements = array_merge($statements, $result);
}
}
$this->return_statements = $old_return_statements;
return $this->_sql_run_sql($statements);
}
/**
* Get queries to drop the default constraints of a column
*
* We need to drop the default constraints of a column,
* before being able to change their type or deleting them.
*
* @param string $table_name
* @param string $column_name
* @return array Array with SQL statements
*/
protected function mssql_get_drop_default_constraints_queries($table_name, $column_name)
{
$statements = array();
if ($this->mssql_is_sql_server_2000())
{
// http://msdn.microsoft.com/en-us/library/aa175912%28v=sql.80%29.aspx
// Deprecated in SQL Server 2005
$sql = "SELECT so.name AS def_name
FROM sysobjects so
JOIN sysconstraints sc ON so.id = sc.constid
WHERE object_name(so.parent_obj) = '{$table_name}'
AND so.xtype = 'D'
AND sc.colid = (SELECT colid FROM syscolumns
WHERE id = object_id('{$table_name}')
AND name = '{$column_name}')";
}
else
{
$sql = "SELECT dobj.name AS def_name
FROM sys.columns col
LEFT OUTER JOIN sys.objects dobj ON (dobj.object_id = col.default_object_id AND dobj.type = 'D')
WHERE col.object_id = object_id('{$table_name}')
AND col.name = '{$column_name}'
AND dobj.name IS NOT NULL";
}
$result = $this->db->sql_query($sql);
while ($row = $this->db->sql_fetchrow($result))
{
$statements[] = 'ALTER TABLE [' . $table_name . '] DROP CONSTRAINT [' . $row['def_name'] . ']';
}
$this->db->sql_freeresult($result);
return $statements;
}
/**
* Get queries to drop the primary keys depending on the specified column
*
* We need to drop primary keys depending on this column before being able
* to delete them.
*
* @param string $table_name
* @param string $column_name
* @return array Array with SQL statements
*/
protected function mssql_get_drop_default_primary_key_queries($table_name, $column_name)
{
$statements = array();
$sql = "SELECT ccu.CONSTRAINT_NAME, ccu.COLUMN_NAME
FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS tc
JOIN INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE ccu ON tc.CONSTRAINT_NAME = ccu.Constraint_name
WHERE tc.TABLE_NAME = '{$table_name}'
AND tc.CONSTRAINT_TYPE = 'Primary Key'
AND ccu.COLUMN_NAME = '{$column_name}'";
$result = $this->db->sql_query($sql);
while ($primary_key = $this->db->sql_fetchrow($result))
{
$statements[] = 'ALTER TABLE [' . $table_name . '] DROP CONSTRAINT [' . $primary_key['CONSTRAINT_NAME'] . ']';
}
$this->db->sql_freeresult($result);
return $statements;
}
/**
* Checks to see if column is an identity column
*
* Identity columns cannot have defaults set for them.
*
* @param string $table_name
* @param string $column_name
* @return bool true if identity, false if not
*/
protected function mssql_is_column_identity($table_name, $column_name)
{
if ($this->mssql_is_sql_server_2000())
{
// http://msdn.microsoft.com/en-us/library/aa175912%28v=sql.80%29.aspx
// Deprecated in SQL Server 2005
$sql = "SELECT COLUMNPROPERTY(object_id('{$table_name}'), '{$column_name}', 'IsIdentity') AS is_identity";
}
else
{
$sql = "SELECT is_identity FROM sys.columns
WHERE object_id = object_id('{$table_name}')
AND name = '{$column_name}'";
}
$result = $this->db->sql_query($sql);
$is_identity = $this->db->sql_fetchfield('is_identity');
$this->db->sql_freeresult($result);
return (bool) $is_identity;
}
/**
* Get a list with existing indexes for the column
*
* @param string $table_name
* @param string $column_name
* @param bool $unique Should we get unique indexes or normal ones
* @return array Array with Index name => columns
*/
public function get_existing_indexes($table_name, $column_name, $unique = false)
{
$existing_indexes = array();
if ($this->mssql_is_sql_server_2000())
{
// http://msdn.microsoft.com/en-us/library/aa175912%28v=sql.80%29.aspx
// Deprecated in SQL Server 2005
$sql = "SELECT DISTINCT ix.name AS phpbb_index_name
FROM sysindexes ix
INNER JOIN sysindexkeys ixc
ON ixc.id = ix.id
AND ixc.indid = ix.indid
INNER JOIN syscolumns cols
ON cols.colid = ixc.colid
AND cols.id = ix.id
WHERE ix.id = object_id('{$table_name}')
AND cols.name = '{$column_name}'
AND INDEXPROPERTY(ix.id, ix.name, 'IsUnique') = " . ($unique ? '1' : '0');
}
else
{
$sql = "SELECT DISTINCT ix.name AS phpbb_index_name
FROM sys.indexes ix
INNER JOIN sys.index_columns ixc
ON ixc.object_id = ix.object_id
AND ixc.index_id = ix.index_id
INNER JOIN sys.columns cols
ON cols.column_id = ixc.column_id
AND cols.object_id = ix.object_id
WHERE ix.object_id = object_id('{$table_name}')
AND cols.name = '{$column_name}'
AND ix.is_primary_key = 0
AND ix.is_unique = " . ($unique ? '1' : '0');
}
$result = $this->db->sql_query($sql);
while ($row = $this->db->sql_fetchrow($result))
{
if (!isset($row['is_unique']) || ($unique && $row['is_unique'] == 'UNIQUE') || (!$unique && $row['is_unique'] == 'NONUNIQUE'))
{
$existing_indexes[$row['phpbb_index_name']] = array();
}
}
$this->db->sql_freeresult($result);
if (empty($existing_indexes))
{
return array();
}
if ($this->mssql_is_sql_server_2000())
{
$sql = "SELECT DISTINCT ix.name AS phpbb_index_name, cols.name AS phpbb_column_name
FROM sysindexes ix
INNER JOIN sysindexkeys ixc
ON ixc.id = ix.id
AND ixc.indid = ix.indid
INNER JOIN syscolumns cols
ON cols.colid = ixc.colid
AND cols.id = ix.id
WHERE ix.id = object_id('{$table_name}')
AND " . $this->db->sql_in_set('ix.name', array_keys($existing_indexes));
}
else
{
$sql = "SELECT DISTINCT ix.name AS phpbb_index_name, cols.name AS phpbb_column_name
FROM sys.indexes ix
INNER JOIN sys.index_columns ixc
ON ixc.object_id = ix.object_id
AND ixc.index_id = ix.index_id
INNER JOIN sys.columns cols
ON cols.column_id = ixc.column_id
AND cols.object_id = ix.object_id
WHERE ix.object_id = object_id('{$table_name}')
AND " . $this->db->sql_in_set('ix.name', array_keys($existing_indexes));
}
$result = $this->db->sql_query($sql);
while ($row = $this->db->sql_fetchrow($result))
{
$existing_indexes[$row['phpbb_index_name']][] = $row['phpbb_column_name'];
}
$this->db->sql_freeresult($result);
return $existing_indexes;
}
/**
* Is the used MS SQL Server a SQL Server 2000?
*
* @return bool
*/
protected function mssql_is_sql_server_2000()
{
if ($this->is_sql_server_2000 === null)
{
$sql = "SELECT CAST(SERVERPROPERTY('productversion') AS VARCHAR(25)) AS mssql_version";
$result = $this->db->sql_query($sql);
$properties = $this->db->sql_fetchrow($result);
$this->db->sql_freeresult($result);
$this->is_sql_server_2000 = $properties['mssql_version'][0] == '8';
}
return $this->is_sql_server_2000;
}
}