在 XML 个节点 SQL 服务器查询中使用 sql:variable 的语法错误
Syntax error using sql:variable in an XML nodes SQL Server query
我一直在研究从 SQL 服务器数据库中提取 XML 数据的查询。我想从 XML 中提取特定行。如果我在 .nodes 行中对 ID 进行硬编码,它会按预期工作,但是当用 sql:variable 替换硬编码值时我无法克服语法错误并且用尽了我的 Google-foo
'''SQL
DECLARE @XML XML = '<DynamicModel>
<AvailableElements>
<Control Id="97a0d1c6-f2b4-4f6f-8d01-f6110f1679af">
<Property Name="Name" Value="Picklist1" />
<Property Name="Id" Value="97a0d1c6-f2b4-4f6f-8d01-f6110f1679af" />
<Property Name="Label" Value="Label value here" />
<Property Name="SelectedItemId" Value="Value in here" Type="System.Nullable`1[[System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]], mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" IsRequired="True" IsReference="True" />
<Elements />
<AvailableElements />
</Control>
</AvailableElements>
</DynamicModel>'
DECLARE @ElementID NVARCHAR(100) = '97a0d1c6-f2b4-4f6f-8d01-f6110f1679af'
/* WORKS */
SELECT
codedValue.value('@Name[1]', 'nvarchar(500)') AS ItemName,
codedValue.value('@Value[1]', 'nvarchar(500)') AS ItemValue
FROM @XML.nodes('/DynamicModel/AvailableElements/Control[@Id="97a0d1c6-f2b4-4f6f-8d01-f6110f1679af"]/Property') AS x(codedValue)
WHERE codedValue.value('@Name[1]', 'nvarchar(500)') IN ('Text','Date','SelectedItemId','Label')
/* DOES NOT WORK */
SELECT
codedValue.value('@Name[1]', 'nvarchar(500)') AS ItemName,
codedValue.value('@Value[1]', 'nvarchar(500)') AS ItemValue
FROM @XML.nodes('/DynamicModel/AvailableElements/Control[@Id="sql:variable("@ElementID")]/Property') AS x(codedValue)
WHERE codedValue.value('@Name[1]', 'nvarchar(500)') IN ('Text','Date','SelectedItemId','Label')
'''
硬编码版本返回两行,基于 XML 是正确的。使用 sql:variable 的版本错误消息为 'XQuery [nodes()]: Syntax error near '@',应为 ']'。'
你的查询应该是这样的-
SELECT
codedValue.value('@Name[1]', 'nvarchar(500)') AS ItemName,
codedValue.value('@Value[1]', 'nvarchar(500)') AS ItemValue
FROM @XML.nodes('/DynamicModel/AvailableElements/Control[@Id=sql:variable("@ElementID")]/Property') AS x(codedValue)
WHERE codedValue.value('@Name[1]', 'nvarchar(500)') IN ('Text','Date','SelectedItemId','Label')
我一直在研究从 SQL 服务器数据库中提取 XML 数据的查询。我想从 XML 中提取特定行。如果我在 .nodes 行中对 ID 进行硬编码,它会按预期工作,但是当用 sql:variable 替换硬编码值时我无法克服语法错误并且用尽了我的 Google-foo
'''SQL
DECLARE @XML XML = '<DynamicModel>
<AvailableElements>
<Control Id="97a0d1c6-f2b4-4f6f-8d01-f6110f1679af">
<Property Name="Name" Value="Picklist1" />
<Property Name="Id" Value="97a0d1c6-f2b4-4f6f-8d01-f6110f1679af" />
<Property Name="Label" Value="Label value here" />
<Property Name="SelectedItemId" Value="Value in here" Type="System.Nullable`1[[System.Int32, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]], mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" IsRequired="True" IsReference="True" />
<Elements />
<AvailableElements />
</Control>
</AvailableElements>
</DynamicModel>'
DECLARE @ElementID NVARCHAR(100) = '97a0d1c6-f2b4-4f6f-8d01-f6110f1679af'
/* WORKS */
SELECT
codedValue.value('@Name[1]', 'nvarchar(500)') AS ItemName,
codedValue.value('@Value[1]', 'nvarchar(500)') AS ItemValue
FROM @XML.nodes('/DynamicModel/AvailableElements/Control[@Id="97a0d1c6-f2b4-4f6f-8d01-f6110f1679af"]/Property') AS x(codedValue)
WHERE codedValue.value('@Name[1]', 'nvarchar(500)') IN ('Text','Date','SelectedItemId','Label')
/* DOES NOT WORK */
SELECT
codedValue.value('@Name[1]', 'nvarchar(500)') AS ItemName,
codedValue.value('@Value[1]', 'nvarchar(500)') AS ItemValue
FROM @XML.nodes('/DynamicModel/AvailableElements/Control[@Id="sql:variable("@ElementID")]/Property') AS x(codedValue)
WHERE codedValue.value('@Name[1]', 'nvarchar(500)') IN ('Text','Date','SelectedItemId','Label')
'''
硬编码版本返回两行,基于 XML 是正确的。使用 sql:variable 的版本错误消息为 'XQuery [nodes()]: Syntax error near '@',应为 ']'。'
你的查询应该是这样的-
SELECT
codedValue.value('@Name[1]', 'nvarchar(500)') AS ItemName,
codedValue.value('@Value[1]', 'nvarchar(500)') AS ItemValue
FROM @XML.nodes('/DynamicModel/AvailableElements/Control[@Id=sql:variable("@ElementID")]/Property') AS x(codedValue)
WHERE codedValue.value('@Name[1]', 'nvarchar(500)') IN ('Text','Date','SelectedItemId','Label')