使用 CROSS APPLY 查询，尝试根据属性值获取字段

Question

我尝试根据属性（文化）的值，从存储为 SQL Server 中 XML 的表单中获取所有字段名称。实际上，我可以获取文本值，但它们被连接到 FieldName 列中。

XML 结构如下所示：

<Form>
  <Field>
    <Field Name="email" Type="text" ColumnSize="6">
      <Localizations>
        <Localization Culture="fr">
          <Text>Adresse couriel</Text>
          <Placeholder>Entrez votre adresse courriel</Placeholder>
        </Localization>
        <Localization Culture="fr">
          <Text>Email</Text>
          <Placeholder>Enter your email</Placeholder>
        </Localization>
      </Localizations>
    </Field>
  </Fields>
</Form>

SQL 查询：

DECLARE @language VARCHAR(2)
SET @language = 'en'
SELECT 
    c.query('data(@Name)') AS FieldUniqueName, 
    c.query('data(./Localizations/Localization/Text)') AS FieldName, 
    c.query('data(@Type)') AS FieldType
FROM dbo.Form Form CROSS APPLY FormContent.nodes('/Form/Fields/Field') x(c)
WHERE Id = @formId
AND FormContent.exist('/Form/Fields/Field/Localizations/Localization[@Culture=sql:variable("@language")]') = 1

结果如下所示：

FieldUniqueName  |  FieldName             | FieldType
name             |  Nom Name              | text
email            |  Adresse couriel Email | text
phone            |  Téléphone Phone Number| text

两种语言都在 FieldName 列中！

我也尝试过：

...
c.value('data(./Localizations/Localization/Text)[1]', 'VARCHAR(100)') AS FieldName,
...

但我需要在 [1] 或 [2] 之间进行选择才能获得正确的语言...

Answer 1

除此之外，您提供的 XML 中存在一些错误（两者的结构和“fr”），您可以试试这个：

DECLARE @tbl TABLE(ID INT IDENTITY, FormContent XML);
INSERT INTO @tbl VALUES
(N'<Form>
  <Fields>
    <Field Name="email" Type="text" ColumnSize="6">
      <Localizations>
        <Localization Culture="fr">
          <Text>Adresse couriel</Text>
          <Placeholder>Entrez votre adresse courriel</Placeholder>
        </Localization>
        <Localization Culture="en">
          <Text>Email</Text>
          <Placeholder>Enter your email</Placeholder>
        </Localization>
      </Localizations>
    </Field>
  </Fields>
</Form>');

查询将根据您的变量返回 loc 值。

DECLARE @language VARCHAR(2)
SET @language = 'en'
SELECT 
    fld.value(N'@Name',N'nvarchar(max)') AS FieldUniqueName, 
    fld.value(N'@Type',N'nvarchar(max)') AS FieldType, 
    loc.value(N'(Text/text())[1]','nvarchar(max)') AS LocalText, 
    loc.value(N'(Placeholder/text())[1]','nvarchar(max)') AS LocalPlaceholder
FROM @tbl Form 
CROSS APPLY FormContent.nodes(N'/Form/Fields/Field') AS A(fld)
CROSS APPLY A.fld.nodes(N'Localizations/Localization[@Culture=sql:variable("@language")]') B(loc)
WHERE Id = 1

Answer 2

好的，我找到了对我的问题的回应！我没有使用 where 子句，而是更改了我的 FieldName 的 XPath。像魅力一样工作：

DECLARE @language VARCHAR(2)
SET @language = 'en'
SELECT 
    c.query('data(@Name)') AS FieldUniqueName, 
    c.query('data(./Localizations/Localization[@Culture=sql:variable("@language")]/Text)') AS FieldName, 
    c.query('data(@Type)') AS FieldType
FROM dbo.Form Form CROSS APPLY FormContent.nodes('/Form/Fields/Field') x(c)
WHERE Id = @formId