在 T-SQL 中通过 XQuery 选择时连接 xml 值

2021-10-01 00:00:00 xml xquery sql-server-2008 sql-server sqlxml

这是我的示例 XML:

This is my sample XML:

<root>
    <element>
        <subelement>
            <value code="code1">value1</value>
            <value code="code2">value2</value>
        </subelement>
    </element>
</root>

这是我的测试查询:

DECLARE @tempTable TABLE (
    ValueCode nvarchar(MAX),
    Value nvarchar(MAX)
)

DECLARE @xml XML
select @xml = cast(c1 as xml) from OPENROWSET (BULK 'C:\test.xml', SINGLE_BLOB) as T1(c1)

INSERT INTO @tempTable
SELECT 
    Tbl.Col.value('subelement[1]/@code', 'NVARCHAR(MAX)'),
    Tbl.Col.value('subelement[1]', 'NVARCHAR(MAX)')
FROM @xml.nodes('//element') Tbl(Col)

SELECT * FROM @tempTable

查询在执行时给出一行，其中 ValueCode 列包含 NULL，Value 列包含value1value2".我想得到的是用分隔符连接的属性和值.例如，我需要 ValueCode 来包含 'code1;code2' 和 Value 包含 'value 1;值2'.我怎样才能做到这一点?

The query, when executed, gives out a row with the ValueCode column containing NULL and the Value column containing 'value1value2'. What I would like to get would be the attributes and values concatenated with a separator. For example, I need ValueCode to contain 'code1; code2' and Value to contain 'value 1; value2'. How can I achieve that?

推荐答案

如果你想要连接字符串，你可以使用 xuery:

you can use xuery if you want concatenated strings:

SELECT 
    Tbl.Col.query('for $i in value return concat($i/text()[1], ";")').value('.', 'nvarchar(max)'),
    Tbl.Col.query('for $i in value return concat($i/@code, ";")').value('.', 'nvarchar(max)')
FROM @xml.nodes('root/element/subelement') Tbl(Col);

如果您希望将值放入行中:

if you want your values into rows:

SELECT 
    Tbl.Col.value('.', 'nvarchar(max)'),
    Tbl.Col.value('@code', 'nvarchar(max)')
FROM @xml.nodes('root/element/subelement/value') Tbl(Col);

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