Question

这里我有2个触发器，它们在插入或更新值后更新字段。我的问题是如何确保我只更新已插入或更新的行上的值，我的更新不包含任何WHERE子句

CREATE TRIGGER LocUpdated  
ON [SqlDistance].[dbo].[DistantTest]  
AFTER  UPDATE   
AS   
IF ( UPDATE (Lat) OR UPDATE (Lon))  
BEGIN  

UPDATE [SqlDistance].[dbo].[DistantTest] 
SET [Geography2] = geography::STGeomFromText('POINT(' + CAST([Lon] AS VARCHAR(20)) + ' ' + 
                    CAST([lat] AS VARCHAR(20)) + ')', 4326)
END;  
GO 


CREATE TRIGGER LocInserted  
ON [SqlDistance].[dbo].[DistantTest]  
AFTER INSERT
AS   
BEGIN  

UPDATE [SqlDistance].[dbo].[DistantTest] 
SET [Geography2] = geography::STGeomFromText('POINT(' + CAST([Lon] AS VARCHAR(20)) + ' ' + 
                    CAST([lat] AS VARCHAR(20)) + ')', 4326)
END;  
GO

Answer 1

您想JOIN inserted UPDATE D SET [Geography2] = geography::STGeomFromText('POINT(' + CAST(i.[Lon] AS VARCHAR(20)) + ' ' + CAST(i.[lat] AS VARCHAR(20)) + ')', 4326) FROM [dbo].[DistantTest] D --no need to declare the database, we're already in it. JOIN inserted i ON D.UniqueIdColumn = i.UniqueIdColumn;。这是伪sql，在没有表DDL的情况下，这应该可以让你走上正轨：

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如何获取MSSQL Server插入或更新触发器上的行ID

1 个答案: