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MySQL Stored Procedure Programming
book

MySQL Stored Procedure Programming

by Guy Harrison, Steven Feuerstein
March 2006
Intermediate to advanced content levelIntermediate to advanced
640 pages
17h 8m
English
O'Reilly Media, Inc.
Content preview from MySQL Stored Procedure Programming

SQL Statements in Stored Functions

You can include SQL statements within stored functions , although you should be very careful about including SQL statements in a stored function that might itself be used inside a SQL statement (more on that later).

However, you cannot return a result set from a stored function: trying to create a stored function that contains a SELECT statement without an INTO clause will result in a 1415 error, as shown in Example 10-5.

Example 10-5. Stored functions cannot return result sets

mysql> CREATE FUNCTION test_func(  )
    -> RETURNS INT
    -> BEGIN
    -> SELECT 'Hello World';
    -> RETURN 1;
    -> END;$$
ERROR 1415 (0A000): Not allowed to return a result set from a function
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Publisher Resources

ISBN: 0596100892Supplemental ContentErrata Page