Detailed explanation of SQL stored procedures

1. Concept of stored procedure

Stored procedure: A collection of one or more SQL statements that have been precompiled into an executable procedure.

2. Syntax for creating stored procedures

create procedure proc_name

[

{@parameter datatype}[=default][output],

{@parameter datatype} [=default] [output]

]

as

SQL_statements

3. Delete the stored procedure:

if (exists(select * from sysobjects where name='proc_name')){

drop proc_name

}

4. Create a stored procedure:

create procedure proc_name

as

begin

select * from 《Table Name》

end

5. Call the stored procedure

exec proc_name

6. Advantages and disadvantages of stored procedures

Advantages: Improve performance, reduce network overhead, facilitate code porting, and have stronger security

Disadvantages: He needs specialized database developers to maintain, design logic changes, and modify stored procedures without sql flexibility

7. Common system stored procedures

exec sp_databases to view databases

exec sp_tables to view tables

exec sp_columns "table name" to view the columns of the data table

exec sp_stored_procedures to view stored procedures

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