Question

我希望在检查后存在或在表中不存在时插入表中。如果不存在插入，如果不存在则插入。

INSERT INTO Database.[dbo].[TBL_AllProduct]
                   ([Product_Name]
                   ,[Product_URL])

SELECT  
      t.v.value('(span[2]/a/text())[1]','nvarchar(max)') as [Name],
      t.v.value('(span[2]/a/@href)[1]','nvarchar(max)') as [URL]
 FROM @html.nodes('div/div') as t(v)

[name] @html.nodes value [name] column {}} [product_name] {}} {}从@html.nodes

中选择

t(v)包含任何行，不仅包含1行。

exmaple for export t(v)

--------------
    NAME
--------------
    piter
    alex
    sony
    telephon
      .
      .
      .

Answer 1

DECLARE @Name  Nvarchar(50)

SET @Name=t.v.value('(span[2]/a/text())[1]','nvarchar(max)') as [Name] FROM @html.nodes('div/div') as t(v)


IF NOT EXISTS (SELECT Product_Name FROM Database.[dbo].[TBL_AllProduct] WHERE Product_Name=@Name) BEGIN 

    INSERT INTO Database.[dbo].[TBL_AllProduct]
                       ([Product_Name]
                       ,[Product_URL])

    SELECT  
          t.v.value('(span[2]/a/text())[1]','nvarchar(max)') as [Name],
          t.v.value('(span[2]/a/@href)[1]','nvarchar(max)') as [URL]
     FROM @html.nodes('div/div') as t(v)

END

在本例中如何在sql中插入表之前检查？

1 个答案: