+ * Is the used MS SQL Server a SQL Server 2000?

+ * @var bool

+ */

+ protected $is_sql_server_2000;

+

+ /**

+ * @param \phpbb\db\driver\driver_interface $db Database connection

+ public function __construct(\phpbb\db\driver\driver_interface $db, $return_statements = false)

+ if ($this->sql_layer == 'mssql' || $this->sql_layer == 'mssqlnative')

+ {

+ if (!isset($table_data['PRIMARY_KEY']))

+ {

+ $table_data['COLUMNS']['mssqlindex'] = array('UINT', null, 'auto_increment');

+ $table_data['PRIMARY_KEY'] = 'mssqlindex';

+ }

+ }

+

+ if (isset($prepared_column['auto_increment']) && $prepared_column['auto_increment'] && strlen($column_name) > 26) // "${column_name}_gen"

+ $table_sql .= "\n);";

+ // Add unique indexes?

+ * Check if a specified index exists in table. Does not return PRIMARY KEY indexes.

+ list($column_type, $orig_column_type) = $this->get_column_type($column_data[0]);

+ * Get the column's database type from the type map

+ *

+ * @param string $column_map_type

+ * @return array column type for this database

+ * and map type without length

+ */

+ function get_column_type($column_map_type)

+ {

+ if (strpos($column_map_type, ':') !== false)

+ {

+ list($orig_column_type, $column_length) = explode(':', $column_map_type);

+ if (!is_array($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']))

+ {

+ $column_type = sprintf($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':'], $column_length);

+ }

+ else

+ {

+ if (isset($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['rule']))

+ {

+ switch ($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['rule'][0])

+ {

+ case 'div':

+ $column_length /= $this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['rule'][1];

+ $column_length = ceil($column_length);

+ $column_type = sprintf($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':'][0], $column_length);

+ break;

+ }

+ }

+

+ if (isset($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['limit']))

+ {

+ switch ($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['limit'][0])

+ {

+ case 'mult':

+ $column_length *= $this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['limit'][1];

+ if ($column_length > $this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['limit'][2])

+ {

+ $column_type = $this->dbms_type_map[$this->sql_layer][$orig_column_type . ':']['limit'][3];

+ }

+ else

+ {

+ $column_type = sprintf($this->dbms_type_map[$this->sql_layer][$orig_column_type . ':'][0], $column_length);

+ }

+ break;

+ }

+ }

+ }

+ $orig_column_type .= ':';

+ }

+ else

+ {

+ $orig_column_type = $column_map_type;

+ $column_type = $this->dbms_type_map[$this->sql_layer][$column_map_type];

+ }

+

+ return array($column_type, $orig_column_type);

+ }

+

+ /**

+ // We need the data here

+ $old_return_statements = $this->return_statements;

+ $this->return_statements = true;

+

+ $indexes = $this->mssql_get_existing_indexes($table_name, $column_name);

+

+ // 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 (sizeof($index_data) > 1)

+ {

+ // Remove this column from the index and recreate it

+ $recreate_indexes[$index_name] = array_diff($index_data, array($column_name));

+ }

+ }

+ }

+

+ // Drop default value constraint

+ $result = $this->mssql_get_drop_default_constraints_queries($table_name, $column_name);

+ $statements = array_merge($statements, $result);

+

+ // Remove the column

+

+ 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;

+ $sql .= ')';

+ $statements[] = 'CREATE UNIQUE INDEX [' . $index_name . '] ON [' . $table_name . ']([' . implode('], [', $column) . '])';

+ $statements[] = 'CREATE INDEX [' . $index_name . '] ON [' . $table_name . ']([' . implode('], [', $column) . '])';

+ // We need the data here

+ $old_return_statements = $this->return_statements;

+ $this->return_statements = true;

+

+ $indexes = $this->mssql_get_existing_indexes($table_name, $column_name);

+

+ // Drop any indexes

+ if (!empty($indexes))

+ {

+ foreach ($indexes as $index_name => $index_data)

+ {

+ $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

+ // Add new default value constraint

+ $statements[] = 'ALTER TABLE [' . $table_name . '] ADD CONSTRAINT [DF_' . $table_name . '_' . $column_name . '_1] ' . $this->db->sql_escape($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);

+ }

+ }

+

+ $this->return_statements = $old_return_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 a list with existing indexes for the column

+ *

+ * @param string $table_name

+ * @param string $column_name

+ * @return array Array with Index name => columns

+ */

+ protected function mssql_get_existing_indexes($table_name, $column_name)

+ {

+ $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}'";

+ }

+ 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}'";

+ }

+

+ $result = $this->db->sql_query($sql);

+ $existing_indexes = array();

+ while ($row = $this->db->sql_fetchrow($result))

+ {

+ $existing_indexes[$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;

+ }