DO

Function

DO executes an anonymous code block.

A code block is a function body without parameters. Its return type is void. It is analyzed and executed at the same time.

Precautions

Before using a programming language, install it in the current database using CREATE LANGUAGE. If no language is specified, plpgsql is installed by default.
To use an untrusted language, you must be a system administrator or have the USAGE permission for programming languages.

Syntax

     
          DO [ LANGUAGE lang_name ] code;

Parameter Description

**Table 1** DO parameters
Parameter	Description	Value Range
lang_name	Name of the programming language used to parse code.	Program language that complies with the specifications. The default language is PL/pgSQL.
code	Programming language code that can be executed.	A string.

Examples

Grant user webuser all the operation permissions on views in the tpcds schema:

      
           DO $$DECLARE r record;
BEGIN
    FOR r IN SELECT c.relname,n.nspname FROM pg_class c,pg_namespace n 
             WHERE c.relnamespace = n.oid AND n.nspname = 'tpcds' AND relkind IN ('r','v')
    LOOP
        EXECUTE 'GRANT ALL ON ' || quote_ident(r.table_schema) || '.' || quote_ident(r.table_name) || ' TO webuser';
    END LOOP;
END$$;