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WITH Clause Functions

without comments

A neat feature of Oracle Database 12c is the ability to put PL/SQL functions inside SQL WITH statements. It’s covered in Chapter 2 on new SQL and PL/SQL features of the Oracle Database 12c PL/SQL Programming. There’s a trick though, you must disable the SQLTERMINATOR before creating the statement or accessing it, like:

SET SQLTERMINATOR OFF

Then, you can write a WITH statement like this:

WITH
FUNCTION glue
( pv_first_name VARCHAR2
, pv_last_name VARCHAR2) RETURN VARCHAR2 IS
  lv_full_name VARCHAR2(100);
BEGIN
  lv_full_name := pv_first_name || ' ' || pv_last_name;
  RETURN lv_full_name;
END;
SELECT glue(a.first_name,a.last_name) AS person
FROM actor a
/

Unfortunately, you need to include it in a view to make the WITH statement useful, like:

CREATE OR REPLACE VIEW actor_v AS
WITH
FUNCTION glue
( pv_first_name VARCHAR2
, pv_last_name VARCHAR2) RETURN VARCHAR2 IS
  lv_full_name VARCHAR2(100);
BEGIN
  lv_full_name := pv_first_name || ' ' || pv_last_name;
  RETURN lv_full_name;
END;
SELECT glue(a.first_name,a.last_name) AS person
FROM actor a
/

Hope this helps those trying to use the feature.

Written by maclochlainn

December 17th, 2013 at 12:27 am

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