Blog Entries tagged 'DB2 Functions'

DB2 Stored Procedures versus Functions

martin@mhubel.com — Thu, 10 Jul 2008 00:00:00 +0100

I provided a sample procedure written using SQL/PL earlier to check if a string contained only numbers. This is a common validation for input strings.

SQL UDFs cannot contain any commands that are outside the scope of the SQL reference. DB2 will take an SQL UDF and stick it directly into the calling SQL, so that when it's executed it's indistinguishable from the
rest of the SQL statement, as far as DB2 is concerned.

On the other hand, an SQL Procedure is a separate entity that cont [...]

DB2 Stored Procedure Exceptions

martin@mhubel.com — Thu, 08 May 2008 00:00:00 +0100

A customer asked me to develop a function to check whether a character string was in fact numeric with the further stipulation that it be done in SQL. He reported that the documentation seemed to be lacking.

The DB2 LUW Information Center used to have a Reference section, where you would find the SQL statement reference along with everything else. This has been reorganized in DB2 9.5 to have a "Database Fundamentals" section. You will find the SQL reference information in there.

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