[英]Use SQL Server modify('insert') to append data to xml column
Consider the following situation. 考虑以下情况。 I have the following table 我有下表
CREATE TABLE [dbo].[GoldenEgg]
(
rowIndex int NOT NULL IDENTITY(1,1),
AccountNumber varchar(256) NULL,
SubscriptionID int NOT NULL,
SubscriptionData_XML xml NULL,
SubscriptionData_AFTER_XML NULL
CONSTRAINT [PK_GoldenEgg]
PRIMARY KEY CLUSTERED ([rowIndex] ASC)
WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF,
IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON,
ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GoldenEgg sample data: GoldenEgg样本数据:
SubscriptionData_XML
data for SubscriptionID 6070: SubscriptionID 6070的SubscriptionData_XML
数据:
<NVPList xmlns="http://www.whatevernamspace.com/v1" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<Item>
<Name>AccountNumbers</Name>
<Value>
<ValueItem>39448474</ValueItem>
</Value>
</Item>
</NVPList>
I want to append all account numbers for each SubscriptionID to the already existing xml <Value>
node in the SubscriptionData_XML column and I do not want to add account numbers that already exist in the xml. 我想将每个SubscriptionID的所有帐号附加到SubscriptionData_XML列中已存在的xml <Value>
节点,我不想添加xml中已存在的帐号。
So for SubscriptionID 6070 account number 39448474 should only be listed once in the xml like so: 因此,对于SubscriptionID 6070,帐号39448474应仅在xml中列出一次,如下所示:
<NVPList xmlns="http://www.whatevernamspace.com/v1" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<Item>
<Name>AccountNumbers</Name>
<Value>
<ValueItem>39448474</ValueItem>
<ValueItem>56936495</ValueItem>
<ValueItem>70660044</ValueItem>
<ValueItem>41447395</ValueItem>
</Value>
</Item>
</NVPList>
If there are not other nodes within your XML you might choose the FLWOR-query . 如果XML中没有其他节点,则可以选择FLWOR查询 。
Some hints: 一些提示:
FOR XML
-sub-select without a namespace to build the <Value>
node wihtout bothering about already existing IDs in your actual XML 我使用没有命名空间的FOR XML
-sub-select来构建<Value>
节点,而不用担心实际XML中已存在的ID FLWOR-query()
to build up the full XML out of the just created Value-node 我使用FLWOR-query()
从刚刚创建的Value-node构建完整的XML UPDATE
由于此CTE是可更新的,我可以直接将其用于UPDATE
SELECT * FROM @tbl
shows to you, that all AFTER_XML
are filled 最终的SELECT * FROM @tbl
向您显示所有AFTER_XML
都已填充 Try this: 尝试这个:
DECLARE @tbl TABLE(rowIndex INT IDENTITY,AccountNumber INT,SubscriptionID INT, SubscriptionData_XML XML,SubscriptionData_AFTER_XML XML);
INSERT INTO @tbl VALUES
(1111,6070,N'<NVPList xmlns="http://www.whatevernamspace.com/v1" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<Item>
<Name>AccountNumbers</Name>
<Value>
<ValueItem>39448474</ValueItem>
</Value>
</Item>
</NVPList>',NULL)
,(2222,6070,NULL,NULL)
,(3333,6070,NULL,NULL)
,(4444,6070,NULL,NULL)
,(5555,6071,N'<NVPList xmlns="http://www.whatevernamspace.com/v1" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<Item>
<Name>AccountNumbers</Name>
<Value>
<ValueItem>39448474</ValueItem>
</Value>
</Item>
</NVPList>',NULL)
,(6666,6071,NULL,NULL)
,(7777,6071,NULL,NULL)
,(8888,6071,NULL,NULL);
--Here starts the updateable CTE - 这是启动可更新的CTE
WITH UpdateableCTE AS
(
SELECT t1.rowIndex
,t1.SubscriptionData_AFTER_XML
,(
SELECT t2.AccountNumber AS ValueItem
FROM @tbl AS t2
WHERE t2.SubscriptionID=t1.SubscriptionID
FOR XML PATH(''),ROOT('Value'),TYPE
).query
(N'declare default element namespace "http://www.whatevernamspace.com/v1";
let $nd:=/*:Value
return
<NVPList>
<Item>
<Name>{sql:column("XmlName")}</Name>
<Value>
{
for $vi in $nd/*:ValueItem
return <ValueItem>{$vi/text()}</ValueItem>
}
</Value>
</Item>
</NVPList>
'
) AS NewXML
FROM @tbl AS t1
CROSS APPLY( SELECT t1.SubscriptionData_XML.value('(//*:Name)[1]','nvarchar(max)') AS XmlName) AS x
WHERE SubscriptionData_XML IS NOT NULL
)
--The UPDATE statement - UPDATE语句
UPDATE UpdateableCTE SET SubscriptionData_AFTER_XML=NewXML
FROM UpdateableCTE;
--The SELECT to check the success - 用于检查成功的SELECT
SELECT * FROM @tbl
I was able to accomplish this task with a sql UPDATE
statement using the xml modify()
method and without using any loops. 我能够使用xml modify()
方法使用sql UPDATE
语句完成此任务,而不使用任何循环。 Here is a breakdown of the solution: 以下是解决方案的细分:
1) I had to get all the AccountNumbers for the SubscriptionID and format them in into xml <ValueItem>
nodes. 1)我必须得到SubscriptionID的所有AccountNumbers并将它们格式化为xml <ValueItem>
节点。
SQL QUERY 1: SQL QUERY 1:
SELECT
ge.SubscriptionID,
CAST((SELECT DISTINCT ValueItem = ISNULL(ge2.AccountNumber,'')
FROM dbo.GoldenEgg ge2
WHERE ge2.SubscriptionID = ge.SubscriptionID
FOR XML PATH('')) AS xml) AS AccountNumberXml
FROM dbo.GoldenEgg ge
WHERE ge.SubscriptionData_XML IS NOT NULL
SQL QUERY 1 RESULT: SQL QUERY 1结果:
SQL QUERY 1 XML RESULT (SubscriptionID 6070): SQL QUERY 1 XML RESULT (SubscriptionID 6070):
<ValueItem>39448474</ValueItem>
<ValueItem>41447395</ValueItem>
<ValueItem>56936495</ValueItem>
<ValueItem>70660044</ValueItem>
2) Now that I have the AccountNumbers in a single value, I can now use the xml modify()
method and insert the AccountNumberXml
value into the last position of the <Value>
xml node. 2)现在我将AccountNumbers放在一个值中,现在我可以使用xml modify()
方法并将AccountNumberXml
值插入<Value>
xml节点的最后一个位置。 I will do this using an UPDATE
statement with INNER JOIN
. 我将使用INNER JOIN
的UPDATE
语句执行此操作。 Also note that I initally set SubscriptionData_AFTER_XML equal to SubscriptionData_XML before doing anything. 另请注意,在执行任何操作之前,我最初将SubscriptionData_AFTER_XML设置为等于SubscriptionData_XML。
SQL QUERY 2: SQL QUERY 2:
UPDATE ge
SET SubscriptionData_AFTER_XML.modify
('declare default element namespace "http://www.whatevernamspace.com/v1";
insert sql:column("t1.AccountNumberXml") as last into (/NVPList/Item/Value)[1]')
FROM dbo.GoldenEgg ge
INNER JOIN (SELECT
ge2.SubscriptionID,
CAST((SELECT DISTINCT ValueItem = ISNULL(ge1.AccountNumber,'')
FROM dbo.GoldenEgg ge1
WHERE ge1.SubscriptionID = ge2.SubscriptionID
FOR XML PATH('')) AS xml) as AccountNumberXml
FROM dbo.GoldenEgg ge2
WHERE ge2.SubscriptionData_AFTER_XML IS NOT NULL) t1 ON t1.SubscriptionID = ge.SubscriptionID
WHERE ge.SubscriptionData_AFTER_XML IS NOT NULL
SQL QUERY 2 RESULT: SQL QUERY 2结果:
SQL QUERY 2 XML RESULT (SubscriptionID 6070 SubscriptionData_AFTER_XML column): SQL QUERY 2 XML RESULT (SubscriptionID 6070 SubscriptionData_AFTER_XML列):
<NVPList xmlns="http://www.whatevernamspace.com/v1" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<Item>
<Name>AccountNumbers</Name>
<Value>
<ValueItem>39448474</ValueItem>
<ValueItem xmlns="">39448474</ValueItem>
<ValueItem xmlns="">41447395</ValueItem>
<ValueItem xmlns="">56936495</ValueItem>
<ValueItem xmlns="">70660044</ValueItem>
</Value>
</Item>
</NVPList>
As you may see there are now two problems with the final xml result in the SubscriptionData_AFTER_XML column. 正如您所看到的,SubscriptionData_AFTER_XML列中的最终xml结果现在存在两个问题。
For subscriptionID 6070 AccountNumber 39448474 is being repeated in the <ValueItem>
node list, which I do not want. 对于subscriptionID 6070,在<ValueItem>
节点列表中重复了AccountNumber 39448474,这是我不想要的。 To fix this I have to query the current AccountNumber values in the xml and exclude those AccountNumbers from the previous INNER JOIN
要修复此问题,我必须查询xml中的当前AccountNumber值,并从之前的INNER JOIN
排除那些AccountNumbers
SQL QUERY 3: SQL QUERY 3:
This query will give me a result set with all the current AccountNumbers in the SubscriptionData_XML column, which I can then use to exclude these AccountNumbers from the SQL QUERY 1 result set 此查询将为我提供一个结果集,其中包含SubscriptionData_XML列中的所有当前AccountNumbers,然后我可以使用它从SQL QUERY 1结果集中排除这些AccountNumbers
SELECT SubscriptionID, t.c.value('.', 'varchar(MAX)') as CurrentValueItems
FROM dbo.GoldenEgg
CROSS APPLY SubscriptionData_XML.nodes('declare default element namespace "http://www.whatevernamspace.com/v1";
/NVPList/Item/Value/ValueItem') as t(c)
WHERE SubscriptionData_XML IS NOT NULL
SQL QUERY 3 RESULT: SQL QUERY 3结果:
Now putting it all together to get the correct final result 现在将它们放在一起以获得正确的最终结果
SQL QUERY 4: SQL QUERY 4:
UPDATE ge
SET SubscriptionData_AFTER_XML.modify
('declare default element namespace "http://www.whatevernamspace.com/v1";
insert sql:column("t1.AccountNumberXml") as last into (/NVPList/Item/Value)[1]')
FROM dbo.GoldenEgg ge
INNER JOIN (SELECT
ge2.SubscriptionID,
CAST((SELECT DISTINCT ValueItem = ISNULL(ge1.AccountNumber,'')
FROM dbo.GoldenEgg ge1
--make sure we are not inserting AccountNumbers that already exists in the subscription data
WHERE ge1.AccountNumber NOT IN (SELECT t.c.value('.', 'varchar(MAX)') as CurrentValueItems
FROM dbo.GoldenEgg
CROSS APPLY SubscriptionData_XML.nodes('declare default element namespace "http://www.whatevernamspace.com/v1";
/NVPList/Item/Value/ValueItem') as t(c)
WHERE SubscriptionData_XML IS NOT NULL
AND SubscriptionID = ge2.SubscriptionID)
AND ge1.SubscriptionID = ge2.SubscriptionID
FOR XML PATH('')) AS xml) as AccountNumberXml
FROM dbo.GoldenEgg ge2
WHERE ge2.SubscriptionData_AFTER_XML IS NOT NULL) t1 ON t1.SubscriptionID = ge.SubscriptionID
WHERE ge.SubscriptionData_AFTER_XML IS NOT NULL
SQL QUERY 4 XML RESULT (SubscriptionID 6070 SubscriptionData_AFTER_XML column): SQL QUERY 4 XML RESULT (SubscriptionID 6070 SubscriptionData_AFTER_XML列):
As you can see AccountNumber 39448474 is now only listed once in the xml 正如您所见,AccountNumber 39448474现在仅在xml中列出一次
<NVPList xmlns="http://www.whatevernamspace.com/v1" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<Item>
<Name>AccountNumbers</Name>
<Value>
<ValueItem>39448474</ValueItem>
<ValueItem xmlns="">41447395</ValueItem>
<ValueItem xmlns="">56936495</ValueItem>
<ValueItem xmlns="">70660044</ValueItem>
</Value>
</Item>
</NVPList>
When the with AccountNumber node list is inserted, it is being inserted with an empty xmlns=""
namespace. 插入带有AccountNumber节点列表时,将插入一个空的xmlns=""
命名空间。 This is query I used to remove the empty xmlns=""
namespace. 这是我用来删除空xmlns=""
命名空间的查询。
SQL QUERY 5: SQL QUERY 5:
UPDATE dbo.GoldenEgg
SET SubscriptionData_AFTER_XML = CONVERT(XML, REPLACE(CONVERT(NVARCHAR(MAX), SubscriptionData_AFTER_XML), N'xmlns=""',''))
WHERE SubscriptionData_AFTER_XML IS NOT NULL
SQL QUERY 5 XML RESULT (SubscriptionID 6070): SQL QUERY 5 XML RESULT (SubscriptionID 6070):
<NVPList xmlns="http://www.whatevernamspace.com/v1" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<Item>
<Name>AccountNumbers</Name>
<Value>
<ValueItem>39448474</ValueItem>
<ValueItem>41447395</ValueItem>
<ValueItem>56936495</ValueItem>
<ValueItem>70660044</ValueItem>
</Value>
</Item>
</NVPList>
I hope this helps anyone who may need to do something similar 我希望这可以帮助任何可能需要做类似事情的人
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