Using Non-SELECT SQL in Stored Programs

When we include a SQL statement that does not return a result setsuch as an UPDATE, INSERT, or SET statementwithin a stored program, it will execute exactly as it would if it were executed in some other context (such as if it were called from PHP or issued from the MySQL command line).

SQL statements within stored programs follow the same syntax as they would outside of the stored program. The SQL statements have full access to any stored program variables, which can be used wherever a literal or expression would normally be provided to the SQL.

You can use all the major categories of SQL statements inside stored programs. DML, DDL, and utility statements can be used without restriction.

Example 5-1 uses a combination of DDL and DML to create and manipulate the data in a table.

Example 5-1. Embedding non-SELECT statements in stored programs

CREATE PROCEDURE simple_sqls( )
BEGIN
 DECLARE i INT DEFAULT 1;

 /* Example of a utility statement */
 SET autocommit=0;

 /* Example of DDL statements */
 DROP TABLE IF EXISTS test_table ;
 CREATE TABLE test_table
 (id INT PRIMARY KEY,
 some_data VARCHAR(30))
 ENGINE=innodb;

 /* Example of an INSERT using a procedure variable */
 WHILE (i<=10) DO
 INSERT INTO TEST_TABLE VALUES(i,CONCAT("record ",i));
 SET i=i+1;
 END WHILE;

 /* Example of an UPDATE using procedure variables*/
 SET i=5;
 UPDATE test_table
 SET some_data=CONCAT("I updated row ",i)
 WHERE id=i;

 /* DELETE with a procedure variable */
 DELETE FROM test_table
 WHERE id>i;

END;

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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