SQL

--数据库--------------------------------------------------
--创建库
GO
CREATE DATABASE DB1
ON
(
 NAME = 'DB1',
 FILENAME = 'F:/Files/Database/DB1.mdf'
)
--删除库
DROP DATABASE DB1

USE DB1

--数据表--------------------------------------------------
/*tab1、tab2、tab3*/
--创建表
GO
CREATE TABLE tabTemp
(
 id int IDENTITY(1,1) NOT NULL,
 username nvarchar(50),
 userpassword nvarchar(50),
 subject nvarchar(200),
 face nvarchar(50),
 sex bit,
 qq nvarchar(50),
 email nvarchar(50),
 content nvarchar(max),
 ip nvarchar(50),
 writetime datetime
)
--删除表
IF EXISTS(SELECT name FROM sysobjects WHERE name='tab3') AND OBJECTPROPERTY(OBJECT_ID('tab3'),'IsUserTable')=1
 DROP TABLE tab3
--重命名
SP_RENAME 'tabTemp', 'tab3'
--添加列
ALTER TABLE tab3
ADD column1 nvarchar(50)
--修改列
ALTER TABLE tab3
ALTER COLUMN column1 int
--删除列
ALTER TABLE tab3
DROP COLUMN column1

--存储过程--------------------------------------------------
/*sp_Delete、sp_Insert、sp_Select*/
--删除已存在
GO
IF EXISTS(SELECT name FROM sysobjects WHERE name='sp_Select' AND type='P')
 DROP PROCEDURE sp_Select
--查询记录
GO
CREATE PROCEDURE sp_Select
 @TabName nvarchar(20)
AS
BEGIN
 SET NOCOUNT ON
 EXECUTE('select * from ' + @TabName)
END

EXECUTE sp_Select 'tab1'

--删除已存在
GO
IF EXISTS(SELECT name FROM sysobjects WHERE name='sp_Insert' AND type='P')
 DROP PROCEDURE sp_Insert
--插入记录
GO
CREATE PROCEDURE sp_Insert
 @username nvarchar(50),
 @userpassword nvarchar(50),
 @subject nvarchar(200),
 @face nvarchar(50),
 @sex bit,
 @qq nvarchar(50),
 @email nvarchar(50),
 @content nvarchar(max),
 @ip nvarchar(50),
 @writetime datetime,
 @autoID int OUTPUT
AS
BEGIN
 INSERT INTO [tab1]
      ([username]
      ,[userpassword]
      ,[subject]
      ,[face]
      ,[sex]
      ,[qq]
      ,[email]
      ,[content]
      ,[ip]
      ,[writetime])
   VALUES
    (@username,
    @userpassword,
    @subject,
    @face,
    @sex,
    @qq,
    @email,
    @content,
    @ip,
    @writetime)
 SELECT @autoID = @@IDENTITY
END

EXECUTE sp_Insert 'aaa','111','过程标题','8',1,'','[email protected]','过程内容','192.168.0.1','2000-12-25 12:00:00',0

--删除已存在
GO
IF EXISTS(SELECT name FROM sysobjects WHERE name='sp_Delete' AND type='P')
 DROP PROCEDURE sp_Delete
--删除记录
GO
CREATE PROCEDURE sp_Delete
 @username nvarchar(50)
AS
BEGIN
 select count(*) as dc from tab1 where username = @username
 delete from tab1 where username = @username
END

EXECUTE sp_Delete 'aaa'

--触发器--------------------------------------------------
sp_help 'tg_Update' --基本信息
sp_helptext 'tg_Update' --正文信息
--删除已存在
GO
IF EXISTS(SELECT name FROM sysobjects WHERE name='tg_Update' AND type = 'TR')
 DROP TRIGGER tg_Update
--更新记录
GO
CREATE TRIGGER tg_Update
ON tab1
FOR update
AS
BEGIN
 DECLARE @un_Deleted nvarchar(50)
 DECLARE @un_Inserted nvarchar(50)
 SELECT @un_Deleted = (select username FROM DELETED) --从DELETED中取更新前的值
 SELECT @un_Inserted = (select username FROM INSERTED) --从INSERTED中取更新后的值

 update tab2 set username=@un_Inserted where username=@un_Deleted
 print @un_Deleted + ' ' + @un_Inserted
END

update tab1 set username='小红' where username='小滨'

--------------------------------------------------

--创建临时表
create table #t (
myid int not null,
mycd varchar(20) null
)
--删除临时表

declare @tmpTable nvarchar(300)
IF EXISTS(SELECT name
      FROM      tempdb..sysobjects
      WHERE  name like '#t'+'%'
      AND      type = 'U')
begin
set @tmpTable=''
set @tmpTable=(SELECT name FROM tempdb..sysobjects WHERE  name like '#t'+'%' AND type = 'U')
exec('drop table '+@tmpTable)
end
GO
--说明
/*
临时表的命名规则：
#t 表示本地变量
##t 表示全局变量
*/