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• SQL点滴24 监测表的变化

<div class="codebody" id="code87675">
-------------------
--Method 1: TRIGGER
-------------------
--Base Table Definition
IF OBJECT_ID('CheckSumTest','U') IS NOT NULL DROP TABLE CheckSumTest
GO
CREATE TABLE CheckSumTest
(
id int IDENTITY(1,1) NOT NULL PRIMARY KEY,
vc1 varchar(1) NOT NULL,
vc2 varchar(1) NOT NULL
)
GO
INSERT dbo.CheckSumTest (vc1,vc2) SELECT 'a','b'
INSERT dbo.CheckSumTest (vc1,vc2) SELECT 'b','a'
GO
--Create Audit Summary Table to hold Meta-Data
IF OBJECT_ID('dbo.TableAuditSummary','U') IS NOT NULL DROP TABLE dbo.TableAuditSummary
CREATE TABLE dbo.TableAuditSummary
( id INT IDENTITY(1,
TableName sysname NOT NULL,
LastUpdate DATETIME NOT NULL,
LastExport DATETIME NOT NULL
)
GO
INSERT dbo.TableAuditSummary (TableName,LastUpdate,LastExport) VALUES ('dbo.CheckSumTest',GETDATE(),GETDATE())
GO
--Tables that need exporting
SELECT FROM dbo.TableAuditSummary WHERE LastUpdate>LastExport
--Create Trigger on all Base Tables
--This fires on any insert/update/delete and writes new LastUpdate column for the table set to Current Date and Time
IF OBJECT_ID('dbo.trg_CheckSumTest_MaintainAuditSummary','TR') IS NOT NULL DROP TRIGGER dbo.trg_CheckSumTest_MaintainAuditSummary
GO
CREATE TRIGGER dbo.trg_CheckSumTest_MaintainAuditSummary
ON dbo.CheckSumTest
AFTER INSERT,UPDATE,DELETE
AS
BEGIN
IF (object_id('dbo.CheckSumTest') IS NOT NULL)
UPDATE dbo.TableAuditSummary SET LastUpdate=GETDATE() WHERE TableName='dbo.CheckSumTest'
END
GO
--Make an Update
UPDATE dbo.CheckSumTest SET vc1='b',vc2='a' WHERE id=1
UPDATE dbo.CheckSumTest SET vc1='a',vc2='b' WHERE id=2
--Check Meta-Data
SELECT FROM dbo.TableAuditSummary WHERE LastUpdate>LastExport
--When we have Exported the data,we run the following to reset MetaData
UPDATE dbo.TableAuditSummary SET LastExport=GETDATE() WHERE LastUpdate>LastExport