Question

SQL Server 2012开发人员版

TESTMACHINE ：

OID MACHINENAME 
---------------
1    TEST A
2    TEST B
3    TEST C

TESTDETAIL ：

OID TESTMACHINEOID TESTID   HISTORYID
-------------------------------------
1       1           200         100
2       1           300         250
3       2           1000        2345
4       3           100         150

TestMachineOID是TestMachine表

的FK

我需要通过对TestMachineOID进行分组来将项目连接成XML。是否有可能获得以下所需的输出？

TESTMACHINEOID  TESTMACHINENAME     TEXTXML
------------------------------------------------------------------------
1                   TEST A          <REC><TESTID>200</TESTID><HISTORYID>100<HISTORYID><TESTID>300</TESTID><HISTORYID>250<HISTORYID></REC>
2                   TEST B          <REC><TESTID>1000</TESTID><HISTORYID>2345<HISTORYID></REC>
3                   TEST C          <REC><TESTID>100</TESTID><HISTORYID>150<HISTORYID></REC>

Answer 1

drop table #testmachine
drop table #testdetail

create table #testmachine (oid int , name nvarchar(10))
create table #testdetail (oid int, machineoid int, testid int, historyid int)

insert into #testmachine (oid, name) values (1,'A')
insert into #testmachine (oid, name) values (2,'B')
insert into #testmachine (oid, name) values (3,'C')

insert into #testdetail (oid, machineoid,testid,historyid) values (1,1,10,20)
insert into #testdetail (oid, machineoid,testid,historyid) values (2,1,30,40)
insert into #testdetail (oid, machineoid,testid,historyid) values (3,2,50,60)
insert into #testdetail (oid, machineoid,testid,historyid) values (4,2,70,80)
insert into #testdetail (oid, machineoid,testid,historyid) values (5,3,90,100)


select 
        tm.oid, 
        tm.name,
        (           
            select testid, historyid
            from #testdetail td 
            where td.machineoid = tm.oid
            for xml path('rec') , root('signal')
        ) as XMLvalue

from 
        #testmachine tm

输出

1   A   <signal><rec><testid>10</testid><historyid>20</historyid></rec><rec><testid>30</testid><historyid>40</historyid></rec></signal>
2   B   <signal><rec><testid>50</testid><historyid>60</historyid></rec><rec><testid>70</testid><historyid>80</historyid></rec></signal>
3   C   <signal><rec><testid>90</testid><historyid>100</historyid></rec></signal>

Answer 2

你需要的是一个“for循环”并用它填充一个额外的表。

循环遍历testmachine表，并为每个OID选择testdetail中的所有记录，然后使用另一个嵌套for循环逐个添加子句

SET TESTXML = CONCAT（TESTXML，new_value）

SQL Server concat XML字符串中的多个值，并作为单行返回

2 个答案: