MySQL stored procedure

Catalog

stored procedure

What are stored procedures for ？

Creation of stored procedures

Delete stored procedure

---

stored procedure

What are stored procedures for ？

Stored procedures and functions are compiled in advance and stored in a database SQL Collection of statements , Calling stored procedures and functions can simplify a lot of work for application developers , Reduce data transfer between database and application server , It's good for improving the efficiency of data processing .

The difference between stored procedures and functions ：

Stored procedures have no return value , Functions have return values

Creation of stored procedures

Define separator ：

Why define delimiters , because mysql The default separator in is ; Then use enter to execute this command , But sometimes we need to define a separator without executing commands .

delimiter $

Restore separator

delimiter ;

Create stored procedure

create procedure pro_test1()
    -> begin
    -> select 'hello word';
    -> end$

Calling stored procedure

call pro_test1();

Stored procedure query

1. Query all stored procedures in the database

select name from mysql.proc where db='test';

among test Name the database

2. Querying the status of stored procedures

show procedure status;

3. View the definition of the specified stored procedure

show create procedure pro_test1;

Delete stored procedure

drop procedure pro_test1;