SQL server xml拆分整再整合行简单示例
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2022-03-16 22:56:19
成效结果:with cte as (select C.*,name FROM (select abc00,x.y.value('.', 'VARCHAR(16)') as abc05,KID from (select ABC00, CAST('' + REPLACE(abc05, ',','
') + '
' as xml ) as KID FROM APP_BUSINESS_CONTRACT where...
成效结果:
with cte as (
select C.*,name FROM (
select abc00,x.y.value('.', 'VARCHAR(16)') as abc05,KID from (
select ABC00, CAST('<row>' + REPLACE(abc05, ',','</row><row>') + '</row>' as xml ) as KID FROM APP_BUSINESS_CONTRACT where abc00=11389 ) as c
CROSS APPLY KID.nodes('row') x(y)
)
AS C
left join APP_BASE_PRODUCT B on B.abp00 = C.abc05)
select c.abc00,abc05,STUFF((SELECT ',' + b.name FROM cte b WHERE b.abc00 = c.abc00 FOR XML PATH('')), 1, 1, '') newname FROM APP_BUSINESS_CONTRACT c
WHERE abc00=11389
关键数据表结构
APP_BUSINESS_CONTRACT合同表(ABC00 合同id,ABC05 产品线id)
APP_BASE_PRODUCT(ABP00 产品线id,name 产品线名称)
此处仅取一条作用例
本人sql基础较为薄弱,仅看网上案例及说明完成sql,部分说明有误的地方欢迎指正
思路:讲合同表的产品线id拆分为列,然后与产品线表一一匹配后,再将多行合并为一行再进行整合显示,主要需要再1,2两个位置的数据操作
第一步,拆分
参考- - -XML基础操作方法
参考- - -CROSS APPLY 使用说明
1.通过replace、cast把abc05转成XML的形式KID字段(如上图示KID列,row或者其他标签都行)
2.KID.nodes(‘row’) x(y) 对XML执行替换row标签的值返回为x(y)”列“
通过xml.nodes x(y) 方法能将xml转化为列表 x(y)
3.通过x.y.value 获取x(y)列的值
xml.value 方法可以获取对应该项值
4. 通过CROSS APPLY 循环 第3步,最后得到上图
左连接关联产品线表后用cte对返回表做一个封装,看起来好看点免得把自己绕晕,后面就可以把cte当作结果集的临时表使用
with cte as (
select C.*,name FROM (
select abc00,x.y.value('.', 'VARCHAR(16)') as abc05,KID from (
select ABC00, CAST('<row>' + REPLACE(abc05, ',','</row><row>') + '</row>' as xml ) as KID FROM APP_BUSINESS_CONTRACT where abc00=11389 ) as c
CROSS APPLY KID.nodes('row') x(y) ) AS C
left join APP_BASE_PRODUCT B on B.abp00 = C.abc05
)
第二部以原合同表为基础表把封装好的结果集多行根据id整合到一行
STUFF简单用法
select c.abc00,abc05,
STUFF((SELECT ',' + b.name FROM cte b WHERE b.abc00 = c.abc00 FOR XML PATH('')), 1, 1, '') newname
FROM APP_BUSINESS_CONTRACT c
WHERE abc00=11389
连同上面的cte 一起运行结果就是一开始显示的结果了,代码上面有
本文地址:https://blog.csdn.net/qq_38333529/article/details/107667426