Question

我需要将另一个查询中的行插入一行，然后插入另一个表中。

如果只返回一行，则可以正常工作。但是，如果行计数大于1，则会失败。

我无法找出for循环 - 用 - **部分表示。

declare @cn as int, @i as int
set @cn = 569
declare @dM table(dM varchar(max))
declare @rowNum table (rowNum int)
set @i = 1

insert @rowNum
exec ('select count(*) from table1 where c = ' + @cn)
--select rowNum from @rowNum as NumberRows --return 2 rows

if (select rowNum from @rowNum as NumberRows) > 1
begin
insert @dM
exec ('select d.d + '' '' + o.o + '' '' + d.v as rtM from table1 where c = ' + @countNumber)
--returns 2 rows as rtM so there will be two inserted rows
--going now okay
--going later okay

--**
while (@i <= (select count(*) from @rowNum)) --didn't work
--for each row returned in rtM in need to include as part of the overall insert
insert into table2 (cn, rtM, idate)
select
@cn
,'Message is: ' + (select dM from @dM) + ' - the message.'
cz.idate + ' ' + qw.txt
from table3 as cz
inner join table4 as qw on cz.id = qw.id
where cz.cn = @cn
set @i = @i + 1
--**
end
else
begin
--there is only 1 row returned from rtM so there will be a single inserted row
insert @dM
exec ('select d.d + '' '' + o.o + '' '' + d.v as rtM from table where c = ' + @countNumber)
insert into table2 (cn, rtM, idate)
select
@cn
,'Message is: ' + (select dM from @dM) + ' - the message.'
cz.idate + ' ' + qw.txt
from table3 as cz
inner join table4 as qw on cz.id = qw.id
where cz.cn = @cn
end

Answer 1

这是一个动态sql没有意义的例子。

INSERT @dM
EXEC ('SELECT d.d + '' '' + o.o + '' '' + d.v AS rtM FROM table1 WHERE c = ' + @countNumber)

这可以在没有像这样的动态sql的情况下重写。

INSERT @dM
SELECT d.d + ' ' + o.o + ' ' + d.v as rtM FROM table1 WHERE c = @countNumber

这里更大的问题是你的查询根本不会在这里工作。动态sql与否这是无效的。您正在引用名为d的对象或别名以及另一个名为o的对象，但这些对象或别名都不在查询中。

Sql for循环包含返回值作为sql插入的一部分

1 个答案: