想想这样的情况，

You have a database with data. There are a number of different applications needed to access that central database, and in the future some new applications too. If you are going to insert the inline database queries to access the central database, inside each application's code individually, then probably you have to duplicate the same query again and again inside different applications' code. In that kind of a situation, you can use stored procedures (SPs). With stored procedures, you are writing number of common queries (procedures) and store them with the central database. Now the duplication of work will never happen as before and the data access and the maintenance will be done centrally.

注意:

In the above situation, you may wonder "Why cannot we introduce a central data access server to interact with all the applications? Yes. That will be a possible alternative. But, The main advantage with SPs over that approach is, unlike your data-access-code with inline queries, SPs are pre-compiled statements, so they will execute faster. And communication costs (over networks) will be at a minimum. Opposite to that, SPs will add some more load to the database server. If that would be a concern according to the situation, a centralized data access server with inline queries will be a better choice.

在存储过程中，语句只被写入一次，从而减少了客户端和服务器之间的网络流量。 我们也可以避免Sql注入攻击。

Incase if you are using a third party program in your application for processing payments, here database should only expose the information it needed and activity that this third party has been authorized, by this we can achieve data confidentiality by setting permissions using Stored Procedures. The updation of table should only done to the table it is targeting but it shouldn't update any other table, by which we can achieve data integrity using transaction processing and error handling. If you want to return one or more items with a data type then it is better to use an output parameter. In Stored Procedures, we use an output parameter for anything that needs to be returned. If you want to return only one item with only an integer data type then better use a return value. Actually the return value is only to inform success or failure of the Stored Procedure.

存储过程是SQL语句和过程逻辑的命名集合，即编译、验证并存储在服务器数据库中。存储过程通常被视为其他数据库对象，并通过服务器安全机制进行控制。

存储过程是一组预编译的SQL语句，用于执行特殊任务。

示例:如果我有一个Employee表

Employee ID  Name       Age  Mobile
---------------------------------------
001          Sidheswar  25   9938885469
002          Pritish    32   9178542436

首先，我正在检索Employee表:

Create Procedure Employee details
As
Begin
    Select * from Employee
End

在SQL Server上运行此过程:

Execute   Employee details

--- (Employee details is a user defined name, give a name as you want)

然后，我将值插入到Employee表中

Create Procedure employee_insert
    (@EmployeeID int, @Name Varchar(30), @Age int, @Mobile int)
As
Begin
    Insert Into Employee
    Values (@EmployeeID, @Name, @Age, @Mobile)
End

在SQL Server上运行参数化过程:

Execute employee_insert 003,’xyz’,27,1234567890

  --(Parameter size must be same as declared column size)

示例:@Name Varchar(30)

在Employee表中，Name列的大小必须是varchar(30)。

对于简单的,

存储过程是存储程序，存储在数据库中的程序或函数。

每个存储的程序都包含一个由SQL语句组成的主体。该语句可以是由几个用分号(;)分隔的语句组成的复合语句。

CREATE PROCEDURE dorepeat(p1 INT)
BEGIN
  SET @x = 0;
  REPEAT SET @x = @x + 1; UNTIL @x > p1 END REPEAT;
END;

“什么是存储过程”已经在这里的其他帖子中回答过了。我将要发布的是一种不太为人所知的使用存储过程的方法。它对存储过程进行分组或对存储过程进行编号。

语法参考

； 按此编号

可选整数，用于对同名过程进行分组。可以使用一个DROP PROCEDURE语句将这些分组的过程放到一起

例子

CREATE Procedure FirstTest 
(
    @InputA INT
)
AS 
BEGIN
    SELECT 'A' + CONVERT(VARCHAR(10),@InputA)
END
GO

CREATE Procedure FirstTest;2
(
    @InputA INT,
    @InputB INT
)
AS 
BEGIN
    SELECT 'A' + CONVERT(VARCHAR(10),@InputA)+ CONVERT(VARCHAR(10),@InputB)
END
GO

Use

exec FirstTest 10
exec FirstTest;2 20,30

结果

另一个尝试

CREATE Procedure SecondTest;2
(
     @InputA INT,
    @InputB INT
)
AS 
BEGIN
    SELECT 'A' + CONVERT(VARCHAR(10),@InputA)+ CONVERT(VARCHAR(10),@InputB)
END
GO

结果

Msg 2730，级别11，状态1，程序SecondTest，行1[批量启动行3] 无法创建组号为2的过程“SecondTest”，因为数据库中当前不存在同名且组号为1的过程。 必须先执行CREATE PROCEDURE 'SecondTest';

引用:

使用数字语法创建过程 在SQL Server中编号的存储过程 对存储过程进行分组- sqlmag .

谨慎

对过程进行分组后，就不能单独删除它们了。 此功能可能会在Microsoft SQL Server的未来版本中删除。