Question

我有一个包含XML列的表，我的数据如下所示：

<Entries>   
    <Entry Default="No" ValueId="1" Sequence="1" Deleted="Yes"><Undefined></Entry>    
    <Entry Default="No" ValueId="2" Sequence="1">Non-Purulent</Entry>    
    <Entry Default="No" ValueId="4" Sequence="2" Deleted="Yes">Sanguinous</Entry>    
    <Entry Default="No" ValueId="11" Sequence="2">Odor Present</Entry>    
    <Entry Default="No" ValueId="3" Sequence="3">Purulent</Entry>    
    <Entry Default="No" ValueId="5" Sequence="3" Deleted="Yes">Serosangiunous</Entry>    
    <Entry Default="No" ValueId="6" Sequence="4">Sanguineous</Entry>    
    <Entry Default="No" ValueId="7" Sequence="4" Deleted="Yes">Serosanguineous</Entry>    
    <Entry Default="No" ValueId="8" Sequence="5">Serous</Entry>    
    <Entry Default="No" ValueId="10" Sequence="6">Sero-sanguineous</Entry>    
    <Entry Default="No" ValueId="9" Sequence="7">Other</Entry>    
</Entries>

我想检索没有Deleted =“Yes”属性的值。我对使用XML查询非常陌生，所以我将非常感谢我能得到的所有帮助。

Answer 1

如果您正在撰写SQL作为标记，并且您的意思是 SQL Server - 那么您可以使用类似的内容（假设您的表名为YourTable持有XML的列称为XmlColumn - 请适应根据您的实际情况！）：

-- define a CTE (Common Table Expression) and extract detail info from XML 
;WITH XmlCte AS
(
    SELECT
        ID,
        XmlText = XC.value('(.)[1]', 'varchar(20)'),
        XmlValueId = XC.value('(@ValueId)[1]', 'int'),
        XmlSequence = XC.value('(@Sequence)[1]', 'int'),
        XmlDeleted = XC.value('(@Deleted)[1]', 'varchar(10)')
    FROM dbo.YourTable
    CROSS APPLY XmlColumn.nodes('/Entries/Entry') AS XT(XC)
)
SELECT
    XmlValueId,
    XmlSequence,
    XmlText
FROM XmlCte
WHERE XmlDeleted IS NULL

Answer 2

根据marc_s，请标记您的RDBMS

关于你的意思是SQL Server，这是使用xquery

执行此操作的一种方法

SELECT
  Nodes.node.value('@Sequence', 'varchar(50)') AS Sequence,
  Nodes.node.value('(./text())[1]', 'varchar(50)') AS Value
FROM
    MyTable xyz
    cross apply xyz.XmlColumn.nodes('/Entries/Entry[not(@Deleted="Yes")]') as Nodes(node);

SqlFiddle here

请注意，您需要将xml定义为<Undefined>。将需要添加到CDATA部分，或者您需要关闭代码。

用于从XML列检索值的SQL查询

2 个答案: