Conclusion

A stored function is a special type of stored program that returns a single result. Stored functions can be used in SQL statements or within other stored programs wherever an expression that returns a corresponding data type can be used.

Stored functions have the following limitations when compared to stored procedures:

  • They may not include OUT or INOUT parameters.
  • They may not return result sets.

A stored function terminates when a RETURN statement is encountered. In general, it is good practice to include a single RETURN statement at the end of the function rather than including multiple RETURN statements inside flow control statements. If a stored function terminates without issuing a RETURN statement, an error will be raised.

You can use stored functions within standard SQL. Doing so can improve the readability and maintainability of the SQL by centralizing the definition of complex calculations, decodes, or other application logic.

Be careful, however, when using stored functions inside SQL statements if those functions embed SQL statements. Stored functions that include SQL can often perform badly when included within standard SQL statements.

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



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

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