Beckham _ mysql stored procedure, Beckham _ mysql

Beckham _ mysql stored procedure, Beckham _ mysql
Stored ProcedureBrief:
1. What is a stored procedure?
2. Use stored procedures

 

I. Stored Procedure

Similar to a function, a piece of code is encapsulated. You can call this stored procedure to execute this code. In the encapsulated statement body, you can use control statements such as if/else, case, and while to program SQL statements.

Ii. Use stored procedures

2.1 view existing stored procedures

2.2 create a stored procedure

A. Stored Procedure without Parameters

Delimiter // Create procedure p1 () Begin Select count (*) from goods; End //

Call the Stored Procedure p1 ()

B. Stored Procedures with parameters (parameters are used to save running results)

 

Delimiter // Create procedure p2 (out a int) Begin Select count (*) into a from goods; End // Delimiter;

Call Stored Procedure p2

(Note: Define variable a to maintain the p2 result of the stored procedure, and then display the value of variable)

C. Stored Procedures with parameters (parameters are used for running)

Delimiter // Create procedure p3 (in a int) Begin Select goods_id, goods_name, shop_price from goods where goods_id =; End // Delimiter;

 

 

 

 

 

Call Stored Procedure p3

D. Stored Procedure with if/else

Call

E. Stored Procedure with while

 

2.3 Delete A Stored Procedure

Summary: differences between stored procedures and functions in mysql

A. Different Names

B. The stored procedure does not return values.

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