Question

我一直在努力解决 System.OutOfMemoryException 。我已经看到了一些解决方案，但所有人都说你需要更多RAM。我怀疑是否是由于代码效率低下。所以让我分享我的问题。
我有10个不同的表，每个表有大约5k的记录，我需要从每个表中选择一列并构建一个新表。我能够插入大约1.5k的记录，但随后执行停止“System.OutOfMemoryException”< / strong>。我的while循环看起来像

ALTER PROCEDURE Sp_sample As Select col1 into #ControlTable from tab1 while exists(select * from #ControlTable) begin (select count(*) from #ControlTable); select @var1 = (select top 1 col1 from #ControlTable); select @var2 = (select top 1 col2 from table1 where col3=@var1); if exists (select a from tablenew where col1=@var1) begin update tablenew set col2 = @var2 where col1 = @var1 end else begin insert into tablenew values (@var1,@var2) end delete from #ControlTable where col1 = @var1; end Begin

我发布了示例代码，以使问题更具通用性。任何帮助或建议都将受到高度赞赏。

Answer 1

请在循环时尝试以下并检查效果：

ALTER PROCEDURE Sp_sample
As 
Select col1, ROW_NUMBER() OVER(Order By col1) AS RowNo
into
#ControlTable
from 
tab1

DECLARE @Index INT=1;
DECLARE @TotalRow INT=0;

SELECT @TotalRow=COUNT(col1) FROM #ControlTable

while @Index<=@TotalRow
begin            
        select @var1 =  var1 from #ControlTable where RowNo=@Index;          
        select @var2 = var2 from table1 where col1=@var1;

        if exists (select a from tablenew where col1=@var1)
        begin               
            update tablenew set col2 = @var2 where col1 = @var1
        end
        else
        begin           
            insert into tablenew values (@var1,@var2)
        end
        SET @Index = @Index+1;
end
Begin

Answer 2

您可以使用Integer.prettyOut()插入或更新表格。

>>> class MyInteger(Integer):
...     def prettyOut(self, value):
...         return hex(value)
... 
>>> MyInteger(123).prettyPrint()
'0x7b'
>>>

在存储过程中使用while循环导致System.OutOfMemoryException？

2 个答案: