Question

我想成功查询（在SSMS中）我的数据库中的一列，该列包含XML中不同类型的所谓AddressElements。包含所有AddressElements的表格如下所示：

create table AddressElements(Address.Id int, AddressType.Id int, AddressElement xml)

AddressElement xml-column中的XML示例结构如下：

<AddressElements xmlns="http://www.myorganisation.nl/schemas/2007/BusinessPropertySchema/AddressElements/Postadres">
    <Postadres_default Straatnaam="Main Street" Huisnummer="1" Postcode="9999 XX" Plaats="ROTTERDAM" />
</AddressElements>

我首先尝试使用WHERE语句进行以下查询，以过滤掉我感兴趣的特定AddressElement。

SELECT m.c.value('@Straatnaam', 'nvarchar(50)') AS Straatnaam
, m.c.value('@Huisnummer', 'int') AS Huisnummer
, m.c.value('@Postcode', 'nvarchar(50)') AS Postcode
, m.c.value('@Plaats', 'nvarchar(50)') AS Plaats

FROM Address as s
    outer apply s.AddressElements.nodes('AddressElements/Postadres_default') AS m(c)

WHERE s.AddressTypeId = '00000000-0000-0000-0000-000000000002'

不幸的是结果是：

Straatnaam  Huisnummer  Postcode    Plaats
NULL        NULL        NULL        NULL
NULL        NULL        NULL        NULL
NULL        NULL        NULL        NULL
NULL        NULL        NULL        NULL

我已经搜索过与我类似的问题/帖子，但到目前为止，我无法让这些解决方案适用于我的案例。如果你们中的任何人可以帮助我，那就太好了！非常感谢你提前！

亲切的问候，英格玛

Answer 1

ZLK评论中提供的解决方案应该有效。

例如，试试这个：

CREATE TABLE Address (AddressId int, AddressTypeId uniqueidentifier, AddressElements xml)

INSERT INTO dbo.Address (AddressId, AddressTypeId, AddressElements)
VALUES (1,'00000000-0000-0000-0000-000000000002',
'<AddressElements xmlns="http://www.myorganisation.nl/schemas/2007/BusinessPropertySchema/AddressElements/Postadres">
    <Postadres_default Straatnaam="Main Street" Huisnummer="1" Postcode="9999 XX" Plaats="ROTTERDAM" />
</AddressElements>')

SELECT m.c.value('@Straatnaam', 'nvarchar(50)') AS Straatnaam
, m.c.value('@Huisnummer', 'int') AS Huisnummer
, m.c.value('@Postcode', 'nvarchar(50)') AS Postcode
, m.c.value('@Plaats', 'nvarchar(50)') AS Plaats
FROM Address as s
    outer apply s.AddressElements.nodes('*:AddressElements/*:Postadres_default') AS m(c)
WHERE s.AddressTypeId = '00000000-0000-0000-0000-000000000002'

;WITH XMLNAMESPACES('http://www.myorganisation.nl/schemas/2007/BusinessPropertySchema/AddressElements/Postadres' as s)
SELECT m.c.value('@Straatnaam', 'nvarchar(50)') AS Straatnaam
, m.c.value('@Huisnummer', 'int') AS Huisnummer
, m.c.value('@Postcode', 'nvarchar(50)') AS Postcode
, m.c.value('@Plaats', 'nvarchar(50)') AS Plaats
FROM Address as s
    outer apply s.AddressElements.nodes('s:AddressElements/s:Postadres_default') AS m(c)
WHERE s.AddressTypeId = '00000000-0000-0000-0000-000000000002'

似乎无法正确查询xml数据类型

1 个答案: