我在存储过程(sql Server 2008)中有一个XML变量,其示例值为
<parent_node> <category>Low</category> <category>Medium</category> <category>High</category> </parent_node>
我必须将每个类别作为单独的记录插入表中.如何迭代XML并获取单个节点值?
如果我想调用存储过程并将每个类别作为输入参数发送,我们该怎么做?存储过程是遗留过程,它一次只接受一个类别.我试图以这种方式调用程序.
>循环从xml变量中获取单个类别.
>使用当前类别调用存储过程.
>转到下一个类别.
>循环直到列表包含值.
任何帮助将不胜感激.
解决方法
像这样的东西?
DECLARE @XmlVariable XML = '<parent_node> <category>Low</category> <category>Medium</category> <category>High</category> </parent_node>' INSERT INTO dbo.YourTargetTable(CategoryColumn) SELECT XTbl.Cats.value('.','varchar(50)') FROM @XmlVariable.nodes('/parent_node/category') AS XTbl(Cats)
更新:如果你必须使用旧的遗留存储过程并且不能改变它(这是我这样做的首选方式),那么你必须自己进行逐行(RBAR)循环,例如:通过使用表变量:
-- declare temporary work table DECLARE @RbarTable TABLE (CategoryName VARCHAR(50)) -- insert values into temporary work table INSERT INTO @RbarTable(CategoryName) SELECT XTbl.Cats.value('.','varchar(50)') FROM @XmlVariable.nodes('/parent_node/category') AS XTbl(Cats) -- declare a single category DECLARE @CategoryNametoBeInserted VARCHAR(50) -- get the first category SELECT TOP 1 @CategoryNametoBeInserted = CategoryName FROM @RbarTable -- as long as we have data WHILE @CategoryNametoBeInserted IS NOT NULL BEGIN -- execute your stored procedure here..... EXEC sp_executesql N'dbo.YourStoredProcedure @CategoryName',N'@CategoryName VARCHAR(50)',@CategoryName = @CategoryNametoBeInserted -- delete the category we just inserted from the temporary work table DELETE FROM @RbarTable WHERE CategoryName = @CategoryNametoBeInserted -- see if we still have more categories to insert SET @CategoryNametoBeInserted = NULL SELECT TOP 1 @CategoryNametoBeInserted = CategoryName FROM @RbarTable ORDER BY CategoryName END
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