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

Part I: Stored Programming Fundamentals

Introduction to MySQL Stored Programs

MySQL Stored Programming Tutorial

Language Fundamentals

Blocks, Conditional Statements, and Iterative Programming

Using SQL in Stored Programming

Error Handling

Part II: Stored Program Construction

Creating and Maintaining Stored Programs

Transaction Management

MySQL Built-in Functions

Stored Functions

Triggers

Part III: Using MySQL Stored Programs in Applications

Using MySQL Stored Programs in Applications

Using MySQL Stored Programs with PHP

Using MySQL Stored Programs with Java

Using MySQL Stored Programs with Perl

Using MySQL Stored Programs with Python

Using MySQL Stored Programs with .NET

Part IV: Optimizing Stored Programs

Stored Program Security

Tuning Stored Programs and Their SQL

Basic SQL Tuning

Advanced SQL Tuning

Optimizing Stored Program Code

Best Practices in MySQL Stored Program Development

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MySQL Stored Procedure Programming
MySQL Stored Procedure Programming
ISBN: 0596100892
EAN: 2147483647
Year: 2004
Pages: 208
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