1. The concept of stored procedures
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
[
{@param_data_type}[=default][output],
{@parameter_data_type} [=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: It requires dedicated database developers to maintain, design logic changes, and modify stored procedures less flexible than SQL
7. Common system stored procedures
exec sp_databases View databases
exec sp_tables view tables
exec sp_columns "table name" View the columns of the data table
exec sp_stored_procedures View stored procedures