如何在SQL Server Manangement Studio中通过更新和替换插入一个新的xml元素。

Question

我有这个XML。

<qrcode xmlns="http://vital.nl/qrcodeSchema.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Echeq>
    <echeqFamilyId>67c8590e-66fe-43e1-9124-a2163a6365df</echeqFamilyId>
  </Echeq>
</qrcode>

但我想得到这个

<qrcode xmlns="http://vital.nl/qrcodeSchema.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Echeq>
 <awardedVPoints>0</awardedVPoints>
    <echeqFamilyId>67c8590e-66fe-43e1-9124-a2163a6365df</echeqFamilyId>
  </Echeq>
</qrcode>

我试图得到这样的结果

UPDATE[dbo].[QRCodeDefinitions]     
SET[QRCodeXml] = CAST(REPLACE(CAST([QRCodeXml] as nvarchar(max)), '',  '<awardedVPoints>0') AS xml) 
FROM [dbo].[QRCodeDefinitions] 
WHERE qrcode = 'newvcheq'

但xml中的内容没有任何改变

所以，我有什么要改变？

谢谢你

好吧，所以我试过这个。

;WITH XMLNAMESPACES(N'http://vital10.nl/qrcodeSchema.xsd' AS ns)
UPDATE [dbo].[QRCodeDefinitions]
SET QRCodeXml = QRCodeXml.query('
    declare default element namespace "http://vital.nl/qrcodeSchema.xsd";
    <qrcode xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    {
        for $x in ns:/qrcode/*
        return (
          if (empty($x/../awardedVPoints)) then (<awardedVPoints> {"0"}</awardedVPoints>)
          else (), $x)
    }
    </qrcode>')
FROM [dbo].[QRCodeDefinitions]
WHERE qrcode = 'newvcheq'

但是，我得到了这个。

Msg 9332, Level 16, State 1, Line 38 XQuery [dbo.QRCodeDefinitions.QRCodeXml.query()]: 在':'附近出现语法错误，预期的是'where'、'(稳定)order by'或'return'。

如果我这样做。

UPDATE [dbo].[QRCodeDefinitions]
SET [QRCodeXml] = [QRCodeXml].query('
declare default element namespace "http://vital.nl/qrcodeSchema.xsd";
<qrcode xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:xsd="http://www.w3.org/2001/XMLSchema">
{
    for $x in /qrcode/*
    return (
        if (empty($x/../awardedVPoints)) then (<awardedVPoints> {"0"}</awardedVPoints>)
        else (), $x)
}
</qrcode>')
FROM [dbo].[QRCodeDefinitions]
WHERE qrcode = 'newvcheq'

我就会得到这个错误

XML Validation: Invalid content: 无效内容。预期的元素：'{http:/vital.nlqrcodeSchema.xsd}ExternalUrl','{http:/vital.nlqrcodeSchema.xsd}平台','{http:/vital.nlqrcodeSchema.xsd}图像','{http:/vital10.nlqrcodeSchema.xsd}Location','{http:/vital.nlqrcodeSchema.xsd}Echeq','{http:/vital.nlqrcodeSchema.xsd}视频'。发现：元素'{http:/vital10.nlqrcodeSchema.xsd}awardedVPoints'代替。位置。:qrcode[1]: awardedVPoints[1].

那我要改什么？谢谢你的建议

表的设计。所以这是表格的细节.与所有的表格字段。

CREATE TABLE [dbo].[QRCodeDefinitions]
(
    [QRCode] [nvarchar](256) NOT NULL,
    [Title] [nvarchar](256) NOT NULL,
    [Description] [nvarchar](max) NOT NULL,
    [CreatedBy] [uniqueidentifier] NOT NULL,
    [CreatedOn] [datetime2](7) NOT NULL,
    [UpdatedOn] [datetime2](7) NOT NULL,
    [ValidUntil] [datetime2](7) NOT NULL,
    [LastScannedOn] [datetime2](7) NULL,
    [TotalScanned] [bigint] NOT NULL,
    [MaxAllowedToScan] [bigint] NULL,
    [MaxAllowedToScanByParticipant] [bigint] NULL,
    [ScanFrequency] [bigint] NULL,
    [ScanFrequencyType] [int] NOT NULL,
    [ActionType] [int] NOT NULL,
    [QRCodeXml] [xml](CONTENT [dbo].[QRCodeSchema-2019-07-23]) NULL,
    [PublishState] [int] NOT NULL,
 CONSTRAINT [PK_QRCodeDefinitions] PRIMARY KEY CLUSTERED 
(
    [QRCode] 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]
GO

ALTER TABLE [dbo].[QRCodeDefinitions] ADD  DEFAULT ((0)) FOR [PublishState]
GO

所以这一定是正确的答案。

UPDATE [dbo].[QRCodeDefinitions]
SET QRCodeXml = QRCodeXml.query('
declare default element namespace "http://vital10.nl/qrcodeSchema.xsd";
<qrcode xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:xsd="http://www.w3.org/2001/XMLSchema">
{
    for $x in /qrcode/*
    return (
        if (empty($x/../awardedVPoints)) then (<awardedVPoints>{"0"}</awardedVPoints>)
        else (), $x)
}
</qrcode>')
FROM[dbo].[QRCodeDefinitions]
WHERE qrcode = 'newvcheq';

Answer 1

请尝试下面的解决方案.它是使用XQuery和它的FLWOR表达式。

SQL

-- DDL and sample data population, start
DECLARE @tbl TABLE (ID INT IDENTITY PRIMARY KEY, QRCodeXml XML, qrcode NVARCHAR(256));
INSERT INTO @tbl (QRCodeXml, qrcode) VALUES
(N'<?xml version="1.0"?>
<qrcode xmlns="http://vital.nl/qrcodeSchema.xsd"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <Echeq>
        <echeqFamilyId>67c8590e-66fe-43e1-9124-a2163a6365df</echeqFamilyId>
    </Echeq>
</qrcode>', 'newvcheq');
-- DDL and sample data population, end

-- before
SELECT * FROM @tbl;

UPDATE @tbl
SET QRCodeXml = QRCodeXml.query('
declare default element namespace "http://vital.nl/qrcodeSchema.xsd";
<qrcode xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:xsd="http://www.w3.org/2001/XMLSchema">
{
    for $x in /qrcode/Echeq
    return <Echeq>
    {
        if (empty($x/awardedVPoints)) then
            (element awardedVPoints {"0"}, $x/*)
        else $x/*
    }
    </Echeq>
}
</qrcode>')
FROM @tbl
WHERE qrcode = 'newvcheq';

-- after
SELECT * FROM @tbl;

产量

<qrcode xmlns="http://vital.nl/qrcodeSchema.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Echeq>
    <awardedVPoints>0</awardedVPoints>
    <echeqFamilyId>67c8590e-66fe-43e1-9124-a2163a6365df</echeqFamilyId>
  </Echeq>
</qrcode>