Question

我有一列ntext数据类型而非XML。它存储所有xml数据。我需要根据xml节点值获取记录。 =＆gt;输入值为CpsiaId = 456并且应该返回在xml中具有此值的所有记录

我尝试了select * from tableName where convert(xml,column_name).value('data((/root/ProductInformation/CPSIA/CpsiaDetails/Item/CpsiaId)[1])','int') = 456

但它不起作用....获取基于xml节点值的记录的任何想法或其他方式。

示例Xml：

<root>
  <ProductInformation>
    <Name> Truck with Battery Charger</Name>
    <Description>Fr.</Description>
    <CPSIA>
      <CpsiaDetails>
        <Item>
          <CpsiaId>456</CpsiaId>
          <CpsiaMessage>waring</CpsiaMessage>
        </Item>
        <Item>
          <CpsiaId>236</CpsiaId>
          <CpsiaMessage>to health</CpsiaMessage>
        </Item>
      </CpsiaDetails>
    </CPSIA>
  </ProductInformation>
</root>

Answer 1

convert(xml,column_name).exist('/root/ProductInformation/CPSIA/CpsiaDetails/Item[CpsiaId=456]') = 1

如果您需要动态值，则可以使用sql:variable()替换常量（456）（假设数字变量为@i）：

'/root/ProductInformation/CPSIA/CpsiaDetails/Item[CpsiaId=sql:variable("@i")]'

修改

请求的示例代码：

DECLARE @t nvarchar(MAX); SET @t = '<root> <ProductInformation> <Name> Truck with Battery Charger</Name> <Description>Fr.</Description> <CPSIA> <CpsiaDetails> <Item> <CpsiaId>456</CpsiaId> <CpsiaMessage>waring</CpsiaMessage> </Item> <Item> <CpsiaId>236</CpsiaId> <CpsiaMessage>to health</CpsiaMessage> </Item> </CpsiaDetails> </CPSIA> </ProductInformation> </root>' DECLARE @i int; SET @i = 456; SELECT convert(xml,@t).exist('/root/ProductInformation/CPSIA/CpsiaDetails/Item[CpsiaId=sql:variable("@i")]')

Answer 2

使用CTE首先将其转换为XML可能更容易，然后执行CROSS应用。这是一个样本

Declare @test table (id int identity, xmlData nvarchar(max))
Insert Into @test 
(xmldata)
Values 
('<root>
  <ProductInformation>
    <Name> Truck with Battery Charger</Name>
    <Description>Fr.</Description>
    <CPSIA>
      <CpsiaDetails>
        <Item>
          <CpsiaId>456</CpsiaId>
          <CpsiaMessage>waring</CpsiaMessage>
        </Item>
        <Item>
          <CpsiaId>236</CpsiaId>
          <CpsiaMessage>to health</CpsiaMessage>
        </Item>
      </CpsiaDetails>
    </CPSIA>
  </ProductInformation>
</root>'),
('<root>
  <ProductInformation>
    <Name> Truck with Battery Charger</Name>
    <Description>Fr.</Description>
    <CPSIA>
      <CpsiaDetails>
        <Item>
          <CpsiaId>999</CpsiaId>
          <CpsiaMessage>waring</CpsiaMessage>
        </Item>
        <Item>
          <CpsiaId>123</CpsiaId>
          <CpsiaMessage>to health</CpsiaMessage>
        </Item>
      </CpsiaDetails>
    </CPSIA>
  </ProductInformation>
</root>')

;with cte as (select id, convert(xml,t.xmlData) xdata from @test t )
SELECT t.*
     from cte inner join @test t
     on cte.id = t.id
    cross apply cte.xdata.nodes('//root/ProductInformation/CPSIA/CpsiaDetails/Item') x(nd)
WHERE
    x.nd.value('CpsiaId[1]','int') =456

使用Lucero对表的选择（而不是xml变量）的答案

DECLARE @i int;
SET @i = 456;
SELECT * 
FROM 
    @test 
WHERE
    convert(xml,xmlData).exist('/root/ProductInformation/CPSIA/CpsiaDetails/Item[CpsiaId=sql:variable("@i")]') = 1

SQL select查询根据xml节点值获取记录？

2 个答案: