:: DEVELOPER ZONE
MySQL Reference Manual :: 19 Stored Procedures and Functions
Search the MySQL manual:
- Preface
- 1 General Information
- 2 Installing MySQL
- 3 MySQL Tutorial
- 4 Using MySQL Programs
- 5 Database Administration
- 6 Replication in MySQL
- 7 MySQL Optimization
- 8 MySQL Client and Utility Programs
- 9 Language Structure
- 10 Character Set Support
- 11 Column Types
- 12 Functions and Operators
- 13 SQL Statement Syntax
- 14 MySQL Storage Engines and Table Types
- 15 The InnoDB Storage Engine
- 16 MySQL Cluster
- 17 Introduction to MaxDB
- 18 Spatial Extensions in MySQL
- 19 Stored Procedures and Functions
- 20 Triggers
- 21 Views
- 22 The INFORMATION_SCHEMA Information Database
- 23 Precision Math
- 24 MySQL APIs
- 25 MySQL Connectors
- 26 Error Handling in MySQL
- 27 Extending MySQL
- A Problems and Common Errors
- B Credits
- C MySQL and the Future (the TODO)
- D MySQL Change History
- E Porting to Other Systems
- F Environment Variables
- G MySQL Regular Expressions
- H GNU General Public License
- I MySQL FLOSS License Exception
- Index
Additional languages
Additional formats
Table of Contents
- 19.1. Stored Procedures and the Grant Tables
- 19.2. Stored Procedure Syntax
- 19.2.1.
CREATE PROCEDUREandCREATE FUNCTION - 19.2.2.
ALTER PROCEDUREandALTER FUNCTION - 19.2.3.
DROP PROCEDUREandDROP FUNCTION - 19.2.4.
SHOW CREATE PROCEDUREandSHOW CREATE FUNCTION - 19.2.5.
SHOW PROCEDURE STATUSandSHOW FUNCTION STATUS - 19.2.6.
CALLStatement - 19.2.7.
BEGIN ... ENDCompound Statement - 19.2.8.
DECLAREStatement - 19.2.9. Variables in Stored Procedures
- 19.2.10. Conditions and Handlers
- 19.2.11. Cursors
- 19.2.12. Flow Control Constructs
- 19.2.1.
- 19.3. Binary Logging of Stored Routines and Triggers
Stored procedures and functions are a new feature in MySQL version 5.0. A stored procedure is a set of SQL statements that can be stored in the server. Once this has been done, clients don't need to keep reissuing the individual statements but can refer to the stored procedure instead.
Some situations where stored procedures can be particularly useful:
When multiple client applications are written in different languages or work on different platforms, but need to perform the same database operations.
When security is paramount. Banks, for example, use stored procedures for all common operations. This provides a consistent and secure environment, and procedures can ensure that each operation is properly logged. In such a setup, applications and users would not get any access to the database tables directly, but can only execute specific stored procedures.
Stored procedures can provide improved performance because less information needs to be sent between the server and the client. The tradeoff is that this does increase the load on the database server system because more of the work is done on the server side and less is done on the client (application) side. Consider this if many client machines (such as Web servers) are serviced by only one or a few database servers.
Stored procedures also allow you to have libraries of functions in the database server. This is a feature shared by modern application languages that allow such design internally, for example, by using classes. Using these client application language features is beneficial for the programmer even outside the scope of database use.
MySQL follows the SQL:2003 syntax for stored procedures, which is also used by IBM's DB2.
The MySQL implementation of stored procedures is still in progress. All syntax described in this chapter is supported and any limitations and extensions are documented where appropriate.
Binary logging for stored routines is done as described in Section 19.3, “Binary Logging of Stored Routines and Triggers”.
© 1995-2005 MySQL AB. All rights reserved.
User Comments
Warning: query failed: Unknown column 'user.firstname' in 'field list' in /data0/sites/live/web-main/lib/mysql-cxn.php on line 69
Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /data0/sites/live/web-main/lib/docbook.php on line 245
Add your own comment.