需要这样一个记录本-2 SQL Server触发器应用实例

利用SQL触发器，完成项目统计功能。加快程序查看报表的速度。

首先建立基础表：TB_IOModuleInput

/*******直接复制到SQL中查询分析器***********/

CREATE TABLE [dbo].[TB_IOModuleInput](

[FID] [int] IDENTITY(1,1) NOT NULL,

[FIOName] [varchar](32) NULL,

[FRecordDT] [datetime] NULL

) ON [PRIMARY]

建立统计结果表：TB_IOModule_Month_RP

/********按月统计IOName输入输出次数**********************/

/********年统计字段FTotal，利用SQL中‘计算所得的列规范’自动进行统计**********************/

CREATE TABLE [dbo].[TB_IOModule_Month_RP](

[FID] [int] IDENTITY(1,1) NOT NULL,

[FIOName] [nvarchar](32) NOT NULL,

[FJanurary] [int] NULL CONSTRAINT [DF_TB_Month_RP_IOName_FJanurary] DEFAULT ((0)),

[FFebruary] [int] NULL CONSTRAINT [DF_TB_Month_RP_IOName_FFebruary] DEFAULT ((0)),

[FMarch] [int] NULL CONSTRAINT [DF_TB_Month_RP_IOName_FMarch] DEFAULT ((0)),

[FApril] [int] NULL CONSTRAINT [DF_TB_Month_RP_IOName_FApril] DEFAULT ((0)),

[FMay] [int] NULL CONSTRAINT [DF_TB_Month_RP_IOName_FMay] DEFAULT ((0)),

[FJune] [int] NULL CONSTRAINT [DF_TB_Month_RP_IOName_FJune] DEFAULT ((0)),

[FJuly] [int] NULL CONSTRAINT [DF_TB_Month_RP_IOName_FJuly] DEFAULT ((0)),

[FAugust] [int] NULL CONSTRAINT [DF_TB_Month_RP_IOName_FAugust] DEFAULT ((0)),

[FSeptember] [int] NULL CONSTRAINT [DF_TB_Month_RP_IOName_FSeptember] DEFAULT ((0)),

[FOctober] [int] NULL CONSTRAINT [DF_TB_Month_RP_IOName_FOctober] DEFAULT ((0)),

[FNovember] [int] NULL CONSTRAINT [DF_TB_Month_RP_IOName_FNovember] DEFAULT ((0)),

[FDecember] [int] NULL CONSTRAINT [DF_TB_Month_RP_IOName_FDecember] DEFAULT ((0)),

[FTotal] AS ((((((((((([FJanurary]+[FFebruary])+[FMarch])+[FApril])+[FMay])+[FJune])+[FJuly])+[FAugust])+[FSeptember])+[FOctober])+[FNovember])+[FDecember]) PERSISTED

) ON [PRIMARY]

对表TB_IOModuleInput建立Insert触发器：tg_IOModuleInput_Insert_MonthRP

/***************当TB_IOModuleInput表有新增加记录时，修改统计表TB_IOModule_Month_RP中对应记录***********/

SET ANSI_NULLS ON

GO

SET QUOTED_IDENTIFIER ON

GO

CREATE TRIGGER [dbo].[tg_IOModuleInput_Insert_MonthRP]

ON [dbo].[TB_IOModuleInput]

AFTER INSERT

AS

BEGIN TRANSACTION

-- SET NOCOUNT ON added to prevent extra result sets from

-- interfering with SELECT statements.

SET NOCOUNT ON;

DECLARE @MONTHINT int

DECLARE @IONAME VARCHAR(32)

select @MONTHINT = Datename(month, (select top(1) FRecordDT from INSERTED))

SELECT TOP(1) @IONAME = FIONAME FROM INSERTED

if (@MONTHINT = 1)

BEGIN

update TB_Month_RP_IOName set FJanurary = FJanurary + 1 WHERE FIONAME = @IONAME

END

ELSE IF (@MONTHINT = 2)

BEGIN

UPDATE TB_Month_RP_IOName set FFebruary = FFebruary + 1 WHERE FIONAME = @IONAME

END

ELSE IF (@MONTHINT = 3)

BEGIN

UPDATE TB_Month_RP_IOName set FMarch = FMarch + 1 WHERE FIONAME = @IONAME

END

ELSE IF (@MONTHINT = 4)

BEGIN

UPDATE TB_Month_RP_IOName set FApril = FApril + 1 WHERE FIONAME = @IONAME

END

ELSE IF (@MONTHINT = 5)

BEGIN

UPDATE TB_Month_RP_IOName set FMay = FMay + 1 WHERE FIONAME = @IONAME

END

ELSE IF (@MONTHINT = 6)

BEGIN

UPDATE TB_Month_RP_IOName set FJune = FJune + 1 WHERE FIONAME = @IONAME

END

ELSE IF (@MONTHINT = 7)

BEGIN

UPDATE TB_Month_RP_IOName set FJuly = FJuly + 1 WHERE FIONAME = @IONAME

END

ELSE IF (@MONTHINT = 8)

BEGIN

UPDATE TB_Month_RP_IOName set FAugust = FAugust + 1 WHERE FIONAME = @IONAME

END

ELSE IF (@MONTHINT = 9)

BEGIN

UPDATE TB_Month_RP_IOName set FSeptember = FSeptember + 1 WHERE FIONAME = @IONAME

END

ELSE IF (@MONTHINT = 10)

BEGIN

UPDATE TB_Month_RP_IOName set FOctober = FOctober + 1 WHERE FIONAME = @IONAME

END

ELSE IF (@MONTHINT = 11)

BEGIN

UPDATE TB_Month_RP_IOName set FNovember = FNovember + 1 WHERE FIONAME = @IONAME

END

ELSE IF (@MONTHINT = 12)

BEGIN

UPDATE TB_Month_RP_IOName set FDecember = FDecember + 1 WHERE FIONAME = @IONAME

END

ELSE

BEGIN

ROLLBACK

RETURN

END

-- Insert statements for trigger here

select 1

COMMIT TRANSACTION

测试：

1.向统计表TB_IOModule_Month_RP中插入基础数据

INSERT INTO TB_MONTH_RP_IONAME (FIONAME) VALUES ( 'GAJ')

INSERT INTO TB_MONTH_RP_IONAME (FIONAME) VALUES ( 'KAJ')

INSERT INTO TB_MONTH_RP_IONAME (FIONAME) VALUES ( 'QDJ')

SELECT * FROM TB_MONTH_RP_IONAME

观察统计表中记录内容，所有月份统计信息全为0

2.向基础表中插入新记录

INSERT INTO TB_IOMODULEINPUT (FIONAME, FRECORDDT) VALUES ('GAJ', '2014-10-12 11:13:33')

INSERT INTO TB_IOMODULEINPUT (FIONAME, FRECORDDT) VALUES ('GAJ', '2014-11-12 11:13:33')

SELECT * FROM TB_MONTH_RP_IONAME

再次观察统计表中内容，发现‘GAJ’对应记录10月份为记数为1，11月份为记数为1，Total年总和为2

测试成功