Question

所以要构建这个问题Selecting from XML field where XML field = X，并使用相同的SQL小提琴，http://sqlfiddle.com/#!3/7c0a0/5。

我似乎无法弄清楚如何获取包含具有值为“付款方式”的FIELD的项目并且具有NEWVALUE为25的项目的记录。

我尝试了以下内容并没有返回任何结果。我假设因为它正在寻找其中一个不存在的节点中的where子句中的所有内容。

SELECT
    ID
FROM 
    T1
CROSS APPLY 
    XmlField.nodes('/ITEMS/ITEM') as XTbl(XItem)
WHERE
    XItem.exist('FIELD[.="Payment method"]') = 1
    and XItem.exist('NEWVALUE[.="25"]') = 1

我错过了什么？

Answer 1

;with cte as 
(
SELECT
    ID, t1.XMLFIELD, row_number() over (partition by ID order by ID) rn
FROM 
    t1
CROSS APPLY 
    XmlField.nodes('/ITEMS/ITEM') as XTbl(XItem)
)
    select XMLFIELD from cte
    where ID IN (
    select ID from cte 
    where XMLFIELD.exist('/ITEMS/ITEM/FIELD[.="Payment method"]') = 1
    and XMLFIELD.exist('/ITEMS/ITEM/NEWVALUE[.="25"]') = 1)
    and rn=1

或更简单......

select
    *
from 
    t1
where
    XMLFIELD.value('count(/ITEMS/ITEM/FIELD[.="Payment method"])','int') > 0
    and 
    XMLFIELD.value('count(/ITEMS/ITEM/NEWVALUE[.="25"])','int') > 0

Answer 2

如果您只想要符合条件的单个项目，那么您可以这样做：

select
    T1.ID, T.C.query('.')
from T1 
   cross apply XMLFIELD.nodes('/ITEMS/ITEM[FIELD[.="Payment method"] and NEWVALUE[.="Debit"]]') as T(C)

或

select
    T1.ID, T.C.query('.')
from T1 
   cross apply XMLFIELD.nodes('/ITEMS/ITEM') as T(C)
where
    T.C.value('FIELD[1]', 'nvarchar(max)') = 'Payment method' and
    T.C.value('NEWVALUE[1]', 'nvarchar(max)') = 'Debit'

sql fiddle demo

在你评论之后，我想，你可能需要这样的东西：

select
    T1.*
from T1 
where 
    XMLFIELD.exist
    ('/ITEMS[
          ITEM[FIELD[.="Payment method"] and NEWVALUE[.="Debit"]] and
          ITEM[DATATYPE[.="4"] and NEWVALUE[.="25"]]
       ]'
    ) = 1

sql fiddle demo

从XML字段中选择，其中XML字段= X，另一个XML字段= Y.

2 个答案: