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;

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;

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)。

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.

存储过程是一组已创建并存储在数据库中的SQL语句。存储过程将接受输入参数，以便多个使用不同输入数据的客户端可以通过网络使用单个过程。存储过程可以减少网络流量并提高性能。如果我们修改一个存储过程，所有的客户端都将得到更新后的存储过程。

创建存储过程的示例

CREATE PROCEDURE test_display
AS
    SELECT FirstName, LastName
    FROM tb_test;

EXEC test_display;

使用存储过程的优点

A stored procedure allows modular programming. You can create the procedure once, store it in the database, and call it any number of times in your program. A stored procedure allows faster execution. If the operation requires a large amount of SQL code that is performed repetitively, stored procedures can be faster. They are parsed and optimized when they are first executed, and a compiled version of the stored procedure remains in a memory cache for later use. This means the stored procedure does not need to be reparsed and reoptimized with each use, resulting in much faster execution times. A stored procedure can reduce network traffic. An operation requiring hundreds of lines of Transact-SQL code can be performed through a single statement that executes the code in a procedure, rather than by sending hundreds of lines of code over the network. Stored procedures provide better security to your data Users can be granted permission to execute a stored procedure even if they do not have permission to execute the procedure's statements directly. In SQL Server we have different types of stored procedures: System stored procedures User-defined stored procedures Extended stored Procedures System-stored procedures are stored in the master database and these start with a sp_ prefix. These procedures can be used to perform a variety of tasks to support SQL Server functions for external application calls in the system tables Example: sp_helptext [StoredProcedure_Name] User-defined stored procedures are usually stored in a user database and are typically designed to complete the tasks in the user database. While coding these procedures don’t use the sp_ prefix because if we use the sp_ prefix first, it will check the master database, and then it comes to user defined database. Extended stored procedures are the procedures that call functions from DLL files. Nowadays, extended stored procedures are deprecated for the reason it would be better to avoid using extended stored procedures.

create procedure <owner>.<procedure name><param> <datatype>
As
    <body>

存储过程是将数据访问集中在一点上的SQL语句组。适用于在一个镜头中执行多个操作。