SQL视图基于xml列

时间:2016-10-24 09:43:44

标签: sql-server xml tsql sql-server-2012 xquery

我的问题是基于XML列构建SQL视图。

我当前的表有两列。一个用于时间戳,另一个用于数据。 数据列来自XML数据类型,内容为:

<data>
    <entry header ="Parameter1" value="1" type="System.Boolean"/>
    <entry header ="Parameter2" value="0" type="System.Boolean"/>
    <entry header ="Parameter3" value="140" type="System.int16"/>
    <entry header ="Parameter4" value="80" type="System.int16"/>
    <entry header ="Parameter5" value="530602-455605" type="System.String"/>
</data> 

现在我要创建以下视图:

Timestamp           | Parameter1 | Parameter 2 | Parameter 3 | Parameter 4 | Parameter 5
--------------------+------------+-------------+-------------+-------------+---------------------
2016-10-24 11:30:00 |     1      |      0      |     140     |     80      | 530602-455605

我该怎么做?

SELECT TOP 1 
    Timestamp 
    Par1... 
    Par2...
    ParN... 
FROM 
    TableName 
ORDER BY 
    Timestamp DESC   

提前致谢!

更新

我得到了以下结果(抱歉格式化):

Timestamp               Header  Value   ValueType

2016-10-24 08:00:00.000 Abguss1 1   System.Boolean

2016-10-24 08:00:00.000 Abguss  0   System.Boolean

2016-10-24 08:00:00.000 Abgussgewicht   140 System.int16

2016-10-24 08:00:00.000 Stopfen 80  System.int16

2016-10-24 08:00:00.000 Werkzeug    530602-455605   System.String

2016-10-24 08:00:20.000 Abguss1 1   System.Boolean

2016-10-24 08:00:20.000 Abguss  0   System.Boolean

2016-10-24 08:00:20.000 Abgussgewicht   138 System.int16

2016-10-24 08:00:20.000 Stopfen 80  System.int16

2016-10-24 08:00:20.000 Werkzeug    530602-455605   System.String

2016-10-24 08:00:40.000 Abguss1 1   System.Boolean

2016-10-24 08:00:40.000 Abguss  0   System.Boolean

2016-10-24 08:00:40.000 Abgussgewicht   178 System.int16

2016-10-24 08:00:40.000 Stopfen 80  System.int16

2016-10-24 08:00:40.000 Werkzeug    530602-455605   System.String

2016-10-24 08:01:20.000 Abguss1 1   System.Boolean

2016-10-24 08:01:20.000 Abguss  0   System.Boolean

2016-10-24 08:01:20.000 Abgussgewicht   158 System.int16

2016-10-24 08:01:20.000 Stopfen 80  System.int16

2016-10-24 08:01:20.000 Werkzeug    530602-455605   System.String

2016-10-24 08:01:43.000 Abguss1 1   System.Boolean

2016-10-24 08:01:43.000 Abguss  0   System.Boolean

2016-10-24 08:01:43.000 Abgussgewicht   162 System.int16

2016-10-24 08:01:43.000 Stopfen 80  System.int16

2016-10-24 08:01:43.000 Werkzeug    530602-455605   System.String

1 个答案:

答案 0 :(得分:2)

尝试这样

DECLARE @tbl TABLE(ID INT, YourTime DATETIME, YourData XML);
INSERT INTO @tbl VALUES(1,GETDATE(),N'<data>
                                        <entry header ="Parameter1" value="1" type="System.Boolean"/>
                                        <entry header ="Parameter2" value="0" type="System.Boolean"/>
                                        <entry header ="Parameter3" value="140" type="System.int16"/>
                                        <entry header ="Parameter4" value="80" type="System.int16"/>
                                        <entry header ="Parameter5" value="530602-455605" type="System.String"/>
                                    </data>');
SELECT ID 
      ,YourTime
      ,YourData.value('(/data/entry[@header="Parameter1"]/@value)[1]','bit') AS Param1
      ,YourData.value('(/data/entry[@header="Parameter2"]/@value)[1]','bit') AS Param2
      ,YourData.value('(/data/entry[@header="Parameter3"]/@value)[1]','int') AS Param3
      ,YourData.value('(/data/entry[@header="Parameter4"]/@value)[1]','int') AS Param4
      ,YourData.value('(/data/entry[@header="Parameter5"]/@value)[1]','nvarchar(max)') AS Param5
FROM @tbl

更新

显然您的数据存在问题...请尝试以下语句查找所有<entry> - 元素并尝试查找,哪一个会扰乱阅读过程......

SELECT ID --or TimeStamp-Column or any other row-defining column
      ,e.value('@header','nvarchar(max)') AS Header
      ,e.value('@value','nvarchar(max)') AS Value
      ,e.value('@type','nvarchar(max)') AS ValueType
FROM YourTable
CROSS APPLY YourData.nodes('/data/entry') AS A(e)

我的阅读代码将选择具有给定标题名称的条目的值,并将其转换为给定的目标类型。只要你告诉我 - 带有连字符的长号位于“Parameter5”中,bit就不会出现投射错误......

更新2

您发布的示例数据清楚地表明,您的XML不会被称为Parameter1Parameter5,而是使用德语单词。试试这样:

SELECT ID 
      ,YourTime
      ,YourData.value('(/data/entry[@header="Abguss1"]/@value)[1]','bit') AS Abguss1
      ,YourData.value('(/data/entry[@header="Abguss"]/@value)[1]','bit') AS Abguss
      ,YourData.value('(/data/entry[@header="Abgussgewicht"]/@value)[1]','int') AS Abgussgewicht
      ,YourData.value('(/data/entry[@header="Stopfen"]/@value)[1]','int') AS Stopfen
      ,YourData.value('(/data/entry[@header="Werkzeug"]/@value)[1]','nvarchar(max)') AS Werkzeug
FROM YourTable

IchwünschevielGlückbeimLösenderAufgabe: - )