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DO

Function

DO executes an anonymous code block.

A code block is a function body without parameters that returns 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

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DO [ LANGUAGE lang_name ] code;

Parameter Description

  • lang_name

    Parses the programming language used by the code. If not specified, the default value plpgsql is used.

  • code

    Specifies executable programming language code. The language is specified as a string.

Examples

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-- Create user webuser:
CREATE USER webuser PASSWORD 'Bigdata123@';

-- Grant to user webuser all the operation permissions on views in the tpcds schema:
DO $$DECLARE r record;
BEGIN
    FOR r IN SELECT c.relname,n.nspname FROM pg_class c,pg_namespace n 
             WHERE c.relnamespace = n.oid AND n.nspname = 'tpcds' AND relkind IN ('r','v')
    LOOP
        EXECUTE 'GRANT ALL ON ' || quote_ident(r.table_schema) || '.' || quote_ident(r.table_name) || ' TO webuser';
    END LOOP;
END$$;


-- Delete user webuser:
DROP USER webuser CASCADE;
Parent topic: DCL Syntax