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如果它尚不存在,我想在表中插入一行。我有以下直接执行的代码:

insert into MyTable (Column1, Column2, Year, Code, Id, UPDATE_IDENT)
select 'Default', 'Default', 2014, '', 0, 0
from sysibm.sysdummy1
WHERE NOT EXISTS (SELECT * FROM MyTable 
WHERE Column1 = 'c1'
AND Column2 = 'c2'
AND Year = 2014)

但是,当我按年将其更改为参数化方法时:

insert into MyTable (Column1, Column2, Year, Code, Id, UPDATE_IDENT)
select 'Default', 'Default', @year, '', 0, 0
from sysibm.sysdummy1
WHERE NOT EXISTS (SELECT * FROM MyTable 
WHERE Column1 = 'c1'
AND Column2 = 'c2'
AND Year = @year)

还尝试在原子部分使用声明的变量但没有成功:

BEGIN ATOMIC
DECLARE varJaar INTEGER;
SET varYear = @year;
insert into MyTable (Column1, Column2, Year, Code, Id, UPDATE_IDENT)
select 'Default', 'Default', varYear , '', 0, 0
from sysibm.sysdummy1
WHERE NOT EXISTS (SELECT * FROM MyTable 
WHERE Column1 = 'c1'
AND Column2 = 'c2'
AND Year = varYear )
END;

我无法执行此操作,因为我无法在我的选择部分中使用参数。尝试将@year 修改为@year 作为 Year,但仍然没有成功。

有没有办法我可以在我的选择部分声明一个临时变量或使用这个参数的东西?

4

1 回答 1

0

最终通过创建临时表解决了这个问题。该变量是临时存储的。该表应自动清除,但是在触发我的方法之前,我仍然在 try-catch 块中执行 drop table 命令:

Try
    Dim adapter As New DataAdapter()
    Dim commandText As String = "drop table QTEMP.tempVariable"
    Dim command As DbCommand = adapter.CreateDbCommand(commandText)

    adapter.ExecuteNonQuery(command)

 Catch notHandledEx As Exception
 End Try

 create table #tempVariable (year int);
 insert into #tempVariable values(@Year);

 insert into MyTable (Column1, Column2, Year, Code, Id, UPDATE_IDENT)
 select 'Default', 'Default',  (select max(year) from #tempVariable), '', 0, 0
 from sysibm.sysdummy1
 WHERE NOT EXISTS (SELECT * FROM MyTable 
 WHERE Column1 = 'c1'
 AND Column2 = 'c2'
 AND Year = @Year)
于 2013-06-24T12:04:32.853 回答