function getTablespace($spcname)
{
$this->clean($spcname);
$sql = "SELECT spcname, pg_catalog.pg_get_userbyid(spcowner) AS spcowner, pg_catalog.pg_tablespace_location(oid) as spclocation,\n (SELECT description FROM pg_catalog.pg_shdescription pd WHERE pg_tablespace.oid=pd.objoid AND pd.classoid='pg_tablespace'::regclass) AS spccomment\n\t\t\t\t\tFROM pg_catalog.pg_tablespace WHERE spcname='{$spcname}'";
return $this->selectSet($sql);
}