我的数据库表中有一列具有名称属性的列，这是一个存储XML数据的Clob对象，如下所示。我尝试使用SQL检索键 accountExpires 的值，该键值应该给我 123456789L 作为输出。
我尝试使用node（Xquery）和CROSS APPLY等，但是我只获取那些通常采用Value格式的文件，例如 IIQDisabled 或 accountFlags 等，但我想检索条目键和值对。感谢您的帮助。
<Attributes>
<Map>
<entry key="Division" value="TRAINING"/>
<entry key="IIQDisabled">
<value>
<Boolean>true</Boolean>
</value>
</entry>
<entry key="accountExpires" value="123456789L"/>
<entry key="accountFlags">
<value>
<List>
<String>Normal User Account</String>
<String>User Account is Disabled</String>
</List>
</value>
</entry>
<entry key="department" value="LOYALTY CLUB"/>
<entry key="distinguishedName" value="CN=Account02\,TM_Test02,OU=SailpointQA,OU=Users...."/>
<entry key="employeeID" value="333223"/>
<entry key="givenName" value="TM_Test02"/>
<entry key="memberOf"/>
<entry key="mobile" value="9"/>
<entry key="sAMAccountName" value="TM_Test02.Account02"/>
<entry key="sAMAccountType" value="805306368"/>
<entry key="sn" value="Account02"/>
<entry key="userAccountControl" value="514"/>
</Map>
</Attributes>
select a.id as id
,pref.value('(@accountExpires)[1]', 'varchar(50)') as accountExpires
,pref.value('.', 'varchar(50)') as test
FROM (
select
id,CONVERT(XML, attributes, 1) xmlCol
from [identityiq].[identityiq].[spt_work_item_archive]) a
CROSS APPLY xmlCol.nodes('//Attributes/Map') AS ApprovalItem(pref)
预期结果：
id accountExpires
-----------------
someid 123456789L
但是实际上我得到的是 true 普通用户帐户 如果使用pref.value（'。'，'varchar（ 50）'）作为测试列。
答案 0 :(得分：0)
您可以尝试使用EXTRACTVALUE函数和XPATH
SELECT EXTRACTVALUE( xmlCol, '//Map/entry [@key='accountExpires']/@value')
AS accountExpires
from [identityiq].[identityiq].[spt_work_item_archive])
答案 1 :(得分：0)
从您自己的代码中，我认为这是SQL Server。至少语法看起来像这样。
您可以尝试以下方法：
DECLARE @xml XML=
N'<Attributes>
<Map>
<entry key="Division" value="TRAINING"/>
<entry key="IIQDisabled">
<value>
<Boolean>true</Boolean>
</value>
</entry>
<entry key="accountExpires" value="123456789L"/>
<entry key="accountFlags">
<value>
<List>
<String>Normal User Account</String>
<String>User Account is Disabled</String>
</List>
</value>
</entry>
<entry key="department" value="LOYALTY CLUB"/>
<entry key="distinguishedName" value="CN=Account02\,TM_Test02,OU=SailpointQA,OU=Users...."/>
<entry key="employeeID" value="333223"/>
<entry key="givenName" value="TM_Test02"/>
<entry key="memberOf"/>
<entry key="mobile" value="9"/>
<entry key="sAMAccountName" value="TM_Test02.Account02"/>
<entry key="sAMAccountType" value="805306368"/>
<entry key="sn" value="Account02"/>
<entry key="userAccountControl" value="514"/>
</Map>
</Attributes>';
-查询
SELECT entr.value('@key','nvarchar(100)') AS AttrKey
,entr.value('@value','nvarchar(500)') AS AttrValue
,HasValueElement.value('local-name(.)','nvarchar(100)') AS ValueType
,HasValueElement.value('text()[1]','nvarchar(500)') AS ValueTypeValue
,IsAList.value('local-name(.)','nvarchar(100)') AS ListValueType
,IsAList.value('text()[1]','nvarchar(500)') AS ListValueValue
FROM @xml.nodes(N'/Attributes/Map/entry') A(entr)
OUTER APPLY A.entr.nodes(N'value/*') B(HasValueElement)
OUTER APPLY B.HasValueElement.nodes('*') C(IsAList);
结果
+--------------------+-----------------------------------------------------+---------+------+--------+--------------------------+
| Division | TRAINING | | NULL | | NULL |
+--------------------+-----------------------------------------------------+---------+------+--------+--------------------------+
| IIQDisabled | NULL | Boolean | true | | NULL |
+--------------------+-----------------------------------------------------+---------+------+--------+--------------------------+
| accountExpires | 123456789L | | NULL | | NULL |
+--------------------+-----------------------------------------------------+---------+------+--------+--------------------------+
| accountFlags | NULL | List | NULL | String | Normal User Account |
+--------------------+-----------------------------------------------------+---------+------+--------+--------------------------+
| accountFlags | NULL | List | NULL | String | User Account is Disabled |
+--------------------+-----------------------------------------------------+---------+------+--------+--------------------------+
| department | LOYALTY CLUB | | NULL | | NULL |
+--------------------+-----------------------------------------------------+---------+------+--------+--------------------------+
| distinguishedName | CN=Account02\,TM_Test02,OU=SailpointQA,OU=Users.... | | NULL | | NULL |
+--------------------+-----------------------------------------------------+---------+------+--------+--------------------------+
| employeeID | 333223 | | NULL | | NULL |
+--------------------+-----------------------------------------------------+---------+------+--------+--------------------------+
| givenName | TM_Test02 | | NULL | | NULL |
+--------------------+-----------------------------------------------------+---------+------+--------+--------------------------+
| memberOf | NULL | | NULL | | NULL |
+--------------------+-----------------------------------------------------+---------+------+--------+--------------------------+
| mobile | 9 | | NULL | | NULL |
+--------------------+-----------------------------------------------------+---------+------+--------+--------------------------+
| sAMAccountName | TM_Test02.Account02 | | NULL | | NULL |
+--------------------+-----------------------------------------------------+---------+------+--------+--------------------------+
| sAMAccountType | 805306368 | | NULL | | NULL |
+--------------------+-----------------------------------------------------+---------+------+--------+--------------------------+
| sn | Account02 | | NULL | | NULL |
+--------------------+-----------------------------------------------------+---------+------+--------+--------------------------+
| userAccountControl | 514 | | NULL | | NULL |
+--------------------+-----------------------------------------------------+---------+------+--------+--------------------------+
一些解释：
共有三种数据：
查询将使用.nodes()深入所有<entry>元素，并将它们作为派生表返回。在给定的OUTER APPLY之下有<value>元素的情况下，第一个<entry>将返回其他行/列。该元素可能具有值（例如布尔值“ true”），或者可能包含类型列表。第二个OUTER APPLY（如果存在）潜入<value>的子节点，并将它们作为附加行返回。
这样的查询将以EAV样式返回更多
SELECT entr.value('@key','nvarchar(100)') AS AttrKey
,COALESCE(entr.value('@value','nvarchar(500)'),HasValueElement.value('text()[1]','nvarchar(500)'),IsAList.value('text()[1]','nvarchar(500)')) AS AttrValue
,HasValueElement.value('local-name(.)','nvarchar(100)') AS ValueType
,IsAList.value('local-name(.)','nvarchar(100)') AS ListValueType
FROM @xml.nodes(N'/Attributes/Map/entry') A(entr)
OUTER APPLY A.entr.nodes(N'value/*') B(HasValueElement)
OUTER APPLY B.HasValueElement.nodes('*') C(IsAList);
结果
+--------------------+-----------------------------------------------------+-----------+---------------+
| AttrKey | AttrValue | ValueType | ListValueType |
+--------------------+-----------------------------------------------------+-----------+---------------+
| Division | TRAINING | | |
+--------------------+-----------------------------------------------------+-----------+---------------+
| IIQDisabled | true | Boolean | |
+--------------------+-----------------------------------------------------+-----------+---------------+
| accountExpires | 123456789L | | |
+--------------------+-----------------------------------------------------+-----------+---------------+
| accountFlags | Normal User Account | List | String |
+--------------------+-----------------------------------------------------+-----------+---------------+
| accountFlags | User Account is Disabled | List | String |
+--------------------+-----------------------------------------------------+-----------+---------------+
| department | LOYALTY CLUB | | |
+--------------------+-----------------------------------------------------+-----------+---------------+
| distinguishedName | CN=Account02\,TM_Test02,OU=SailpointQA,OU=Users.... | | |
+--------------------+-----------------------------------------------------+-----------+---------------+
| employeeID | 333223 | | |
+--------------------+-----------------------------------------------------+-----------+---------------+
| givenName | TM_Test02 | | |
+--------------------+-----------------------------------------------------+-----------+---------------+
| memberOf | NULL | | |
+--------------------+-----------------------------------------------------+-----------+---------------+
| mobile | 9 | | |
+--------------------+-----------------------------------------------------+-----------+---------------+
| sAMAccountName | TM_Test02.Account02 | | |
+--------------------+-----------------------------------------------------+-----------+---------------+
| sAMAccountType | 805306368 | | |
+--------------------+-----------------------------------------------------+-----------+---------------+
| sn | Account02 | | |
+--------------------+-----------------------------------------------------+-----------+---------------+
| userAccountControl | 514 | | |
+--------------------+-----------------------------------------------------+-----------+---------------+