Application of SQL stored procedures in the. NET Database

A Objective:
A stored procedure (Stored Procedure) is a set of SQL statements that are compiled and stored in a database in order to complete a specific function. The user executes it by specifying the name of the stored procedure and giving the parameter (if the stored procedure has parameters). Stored procedures are an important object in a database, and any well-designed database application should use stored procedures. In general, stored procedures have the following advantages:
Stored procedures allow standard component programming
Stored procedures can achieve faster execution speed
Stored procedures can reduce network traffic
Stored procedures can be used as a security mechanism to make full use of
The author of this article will introduce to you. NET database application, and how to use it in conjunction with SqlDataAdapter objects, dataset objects, and so on in ado.net to improve the overall performance of. NET database applications.
Two System Requirements:
Development tools: Visual Studio.NET
Database management system: SQL Server 2000 (which contains the pubs database used by the sample program)
Three To create a simple stored procedure:
Here I'll show you how to use the Visual Studio.NET IDE to create stored procedures. Using the Visual Studio.NET IDE to create stored procedures is very easy and intuitive, and you will find a variety of database objects, including stored procedures, as long as you are directed to the pubs database and expand nodes in Server Explorer, as shown in Figure 1.

Right-click on the stored Procedure node to pop up a menu that contains the command for new stored procedure. After you create a new stored procedure, the Code editing window in the IDE appears with the following code template:
CREATE PROCEDURE dbo. StoredProcedure1
/*
(
@parameter1 datatype = default value,
@parameter2 datatype OUTPUT)
*/
As
/* SET NOCOUNT on * *
Return

The code template above conforms to the simplified syntax rules for creating stored procedures, and the complete syntax rules are as follows:
CREATE PROC [edure] procedure_name [; number]
[{@parameter data_type}
[Varying] [= default] [OUTPUT]
] [,... N]
[With
{RECOMPILE | Encryption | RECOMPILE, encryption}]
[For REPLICATION]
As sql_statement [... n]

Limited to space, the meaning of each parameter is not much described here, interested readers can refer to the SQL Server 2000 database management System information.
Here's a brief introduction to the various grammatical components in the code template. The CREATE PROCEDURE declaration creates a stored procedure followed by the name of the stored procedure. The ingredient in "/*......*/" is the parameter of the stored procedure, which can include input parameters and output parameters. The AS keyword follows the body part of the stored procedure, which is any number and type of SQL statements contained in the stored procedure. The return keyword indicates that the stored procedure ends and returns an integral state value to the caller. Here we'll create a simple stored procedure with no parameters and use it: