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
