sqlserver存储过程学习

存储过程语法如下：

CREATE PROC [ EDURE ] procedure_name [ ; number ]

    [ { @parameter data_type }

        [ VARYING ] [ = default ] [ OUTPUT ]

    ] [ ,...n ]

 

[ WITH

    { RECOMPILE | ENCRYPTION | RECOMPILE , ENCRYPTION } ]

 

[ FOR REPLICATION ]

 

AS

sql_statement [ ...n ]

简单实例：

1、创建存储过程

Create PROCEDURE WeekDay
as

--下面sql为sql_statement
begin
Declare
      @week nvarchar(20),
      @today int

begin
set @today=3
set @week=case
when @today=1 then '星期一'
when @today=2 then '星期二'
when @today=3 then '星期三'
when @today=4 then '星期四'
when @today=5 then '星期五'
when @today=6 then '星期六'
when @today=7 then '星期日'
else '值错误'
end
print @week
end
end

2、执行存储过程

exec   WeekDay

常用sql语句：1)if语句

DECLARE @d INT
set @d = 1
IF @d = 1 BEGIN
   PRINT '正确'
END
ELSE BEGIN
   PRINT '错误'
END

2)多条件选择语句

declare @today int
declare @week nvarchar(3)
set @today=3
set @week= case
     when @today=1 then '星期一'
     when @today=2 then '星期二'
     when @today=3 then '星期三'
     when @today=4 then '星期四'
     when @today=5 then '星期五'
     when @today=6 then '星期六'
     when @today=7 then '星期日'
     else '值错误'
end
print @week

3)循环语句 

DECLARE @i INT
SET @i = 1
WHILE @i<1000000 BEGIN
set @i=@i+1
END

 4)游标

• 变量赋值：1）set @a=5   2）select @user1= '张三'；select @user2 =  Name from ST_User  where ID=1 3）update ST_User  set @user3 =  Name where ID=1
• 
• 触发器
• 
• 标量函数：https://www.cnblogs.com/BrokenIce/p/5713225.html