sql-server - 比较 sql 查询中的两个 xml 变量并得到区别？

Question

@oldXML = <root><row USER_KEY="1" USER_NAME="test" USER_ID="12345" USER_STATUS=" " USER_GENDER="F" /></root> 

@newXML = <root><row USER_KEY="1" USER_NAME="test" USER_ID="00000" USER_STATUS=" " USER_GENDER="F" /> 
</root>

我有近 100 个这样的列...我不知道如何比较这些标签并将它们与归档名称和以前的值以及更改的值一起存储在我的审计表中

在上面的值中，我只修改了 USER_ID 值。我不确定字符串拆分功能如何帮助我。请建议....

提前致谢..

Answer 1

尝试这样的事情 -

DECLARE 
      @oldXML NVARCHAR(MAX)
    , @newXML NVARCHAR(MAX)

SELECT 
      @oldXML = '<root><row USER_KEY="1" USER_NAME="test" USER_ID="12345" USER_STATUS=" " USER_GENDER="F" /></root>' 
    , @newXML = '<root><row USER_KEY="1" USER_NAME="test" USER_ID="00000" USER_STATUS=" " USER_GENDER="F" /></root>'

;WITH cte AS 
(
    SELECT id, t.rn, token = SUBSTRING(name, 1, CHARINDEX('" ', t.name) - 1)
    FROM (
        SELECT 
              name = 
                SUBSTRING(
                      t.string
                    , number + 2
                    , ABS(CHARINDEX('="', t.string, number + 1) - number - 1))
            , rn = ROW_NUMBER() OVER (PARTITION BY t.id ORDER BY (SELECT 1))
            , id
        FROM (
            SELECT id = 1, string = @newXML

            UNION ALL

            SELECT id = 2, @oldXML
        ) t
        CROSS JOIN [master].dbo.spt_values n
        WHERE [type] = 'p'
            AND number <= LEN(t.string) - 1
            AND SUBSTRING(t.string, number, 2) = '="'
    ) t
)
SELECT t2.token
FROM (
    SELECT * 
    FROM cte 
    WHERE id = 1
) t1
LEFT JOIN (
    SELECT * 
    FROM cte 
    WHERE id = 2
) t2 ON t1.rn = t2.rn AND t1.token != t2.token
WHERE t2.token IS NOT NULL