Question

我尝试使用MERGE语句对iSeries db2进行基本upsert，类似于Does DB2 have an "insert or update" statement?和http://db2performance.blogspot.com/2011/12/merge-make-your-upserts-quick.html中所述。执行时，它会给我Row not found for MERGE. SQLSTATE=02000而不是插入行。由于我在语句中有when not matched then insert，为什么它会返回错误而不是插入？我看了很多，并没有看到这个特殊的问题。

以下是我正在使用的声明：

merge into UFDFTRN as T using (
    select * from UFDFTRN 
    where DFCNO = 354 and DFINV = 1179 and DFLC = 1 and DFDATE = '2017-01-31'
        and DFSPLT = 0 and DFSEQ = 100
) as S on (
    T.DFCNO = S.DFCNO and T.DFINV = S.DFINV and T.DFDATE = S.DFDATE and
    T.DFSPLT = S.DFSPLT and T.DFSEQ = S.DFSEQ
) when matched then 
    update set DFSEQ = 1000, DFTRAN = 0, DFITEM = 'F224', DFRITM = '0', 
        DFDESC = 'DAIRY VTM PREMIX', DFQTY = 3, DFUM = '',DESIQU = 0, DFRTQU = 3,
        DFUPR = 0, DFCTUP = 0, DFUCST = 0, DFOUCST = 0, DFAMT = 0, DFOAMT = 0, DFCODE = '',
        DFURAT = '', DFCGCD = '0', DFCTNO = 0, DFADJITM = '', DFADJPCT = 0, DFMNFITM = '',
        DFMNFRAT = '', DFMNFQTY = '0', DFMNFTQTY = '0'
when not matched then 
    insert (DFCNO, DFINV, DFLC, DFDATE, DFSPLT, DFSEQ, DFTRAN, DFITEM, DFRITM, DFDESC,
        DFQTY, DFUM, DFSIQU, DFRTQU, DFUPR, DFCTUP, DFUCST, DFOUCST, DFAMT, DFOAMT, DFCODE,
        DFURAT, DFCGCD, DFCTNO, DFADJITM, DFADJPCT, DFMNFITM, DFMNFRAT, DFMNFQTY, DFMNFTQTY
    ) values (
        354, 1179, 1, '2017-01-31', 0, 1000, 0, 'F224', '0', 'DAIRY VTM PREMIX', 3, '', 0,
        3, 0, 0, 0, 0, 0, 0, '', '', '0', 0, '', 0, '', '', '0', '0'
    )

Answer 1

看起来应该更像这样：

merge into UFDFTRN as T using (
    select 354 DFCNO, 1179 DFINV, 1 DFLC, '2017-01-31' DFDATE, 0 DFSPLT, 100 DFSEQ
           , 'DAIRY VTM PREMIX' f1 -- all other columns you might need
    from sysibm.sysdummy1 
) as S 
on (
    T.DFCNO = S.DFCNO and T.DFINV = S.DFINV and T.DFDATE = S.DFDATE and
    T.DFSPLT = S.DFSPLT and T.DFSEQ = S.DFSEQ
) 
when matched then 
    update set T.DFSEQ = S.DFSEQ, T.DFTRAN = S.DFTRAN, -- etc. etc.
when not matched then 
    insert (DFCNO, DFINV, ... -- etc. etc.
    ) values (
        S.DFSNO, S.DFINV, ..., S.F1, ...-- etc. etc.
    )

PS。未经测试。

Answer 2

Mustaccio有合适的合并格式......

但正如我评论的那样，使用合并是一种非常有趣的方式。

就个人而言，我只想做一次

update UFDFTRN 
set (DFCNO, DFINV, DFLC, DFDATE, DFSPLT, DFSEQ, DFTRAN, DFITEM, DFRITM, DFDESC,
        DFQTY, DFUM, DFSIQU, DFRTQU, DFUPR, DFCTUP, DFUCST, DFOUCST, DFAMT, DFOAMT, DFCODE,
        DFURAT, DFCGCD, DFCTNO, DFADJITM, DFADJPCT, DFMNFITM, DFMNFRAT, DFMNFQTY, DFMNFTQTY
    ) = (
        354, 1179, 1, '2017-01-31', 0, 1000, 0, 'F224', '0', 'DAIRY VTM PREMIX', 3, '', 0,
        3, 0, 0, 0, 0, 0, 0, '', '', '0', 0, '', 0, '', '', '0', '0'
    )
where DFCNO = 354 and DFINV = 1179 and DFLC = 1 and DFDATE = '2017-01-31'
        and DFSPLT = 0 and DFSEQ = 100

如果在找不到记录时失败，只需将更新更改为插入

insert into UFDFTRN 
 (DFCNO, DFINV, DFLC, DFDATE, DFSPLT, DFSEQ, DFTRAN, DFITEM, DFRITM, DFDESC,
        DFQTY, DFUM, DFSIQU, DFRTQU, DFUPR, DFCTUP, DFUCST, DFOUCST, DFAMT, DFOAMT, DFCODE,
        DFURAT, DFCGCD, DFCTNO, DFADJITM, DFADJPCT, DFMNFITM, DFMNFRAT, DFMNFQTY, DFMNFTQTY
    ) values (
        354, 1179, 1, '2017-01-31', 0, 1000, 0, 'F224', '0', 'DAIRY VTM PREMIX', 3, '', 0,
        3, 0, 0, 0, 0, 0, 0, '', '', '0', 0, '', 0, '', '', '0', '0'
    )

DB2 merge upsert获取'MERGE'找不到行'错误

2 个答案: