DO statement to execute an anonymous code block, or in other words, a transient anonymous function in a procedural language.
The code block is treated as though it were the body of a function with no parameters, returning void. It is parsed and executed a single time.
LANGUAGE clause can be written either before or after the code block.
do ::= DO [ LANGUAGE lang_name ] code
The procedural language code to be executed. This must be specified as a string literal, just as in
CREATE FUNCTION. Use of a dollar-quoted literal is recommended.
The name of the procedural language the code is written in. If omitted, the default is
The procedural language to be used must already have been installed into the current database.
plpgsql is installed by default, but other languages are not.
DO is executed in a transaction block, then the procedure code cannot execute transaction control statements. The attempt causes this runtime error:
2D000: invalid transaction termination
Transaction control statements are allowed with
AUTOCOMMIT set to
on—in which case the
DO statement executes in its own transaction.
DO $$DECLARE r record; BEGIN FOR r IN SELECT table_schema, table_name FROM information_schema.tables WHERE table_type = 'VIEW' AND table_schema = 'public' LOOP EXECUTE 'GRANT ALL ON ' || quote_ident(r.table_schema) || '.' || quote_ident(r.table_name) || ' TO webuser'; END LOOP; END$$;