Question

我想在sybase中创建一个while循环，循环时我的临时表“nodesNotHavingCriteria”中还有任何条目。但我在下面创建的程序似乎永远持续下去，我认为这是因为while循环正在进行，但我似乎找不到它的理由。有人可以帮忙吗？这对我来说似乎很好，无法找到永无止境的原因。

 create PROCEDURE createCriteria
    as begin 
    declare @uid varchar(10)
    while (select count(*) from #nodesNotHavingCriteria) > 0
      set rowcount 1
      select @uid = nodes from #nodesNotHavingCriteria -- pull one uid from the temp table
      set rowcount 0
      delete from #nodesNotHavingCriteria where nodes = @uid -- delete that uid from the temp table

      -- Do something with the uid you have
      --insert into BacktestingCriteria (nodeId,hierarchyViewId,varCriteriaId,pnlCriteriaId) values
    --  (@uid,16008,16,3)
    --insert into BacktestingCriteria (nodeId,hierarchyViewId,varCriteriaId,pnlCriteriaId) values
      --(@uid,16008,16,4)
    end

Answer 1

我认为你的while循环不再是检查标准了。它只选择一次计数并检查＆gt; 0永远

也许你应该尝试类似（js中的伪代码）

var count = select count(*) from #nodesNotHavingCriteria;
while(count > 0)
    // Do anything
    count = select count(*) from #nodesNotHavingCriteria;

我也不了解sybase，但是从中删除后，＃nodesNotHavingCriteria真的更新了吗？

Answer 2

找到原因。我应该在while之后添加。这可行

  create PROCEDURE createCriteria
as begin 
declare @uid varchar(10)
while ((select count(*) from #nodesNotHavingCriteria)>0)
begin
  set rowcount 1
  select @uid = nodes from #nodesNotHavingCriteria -- pull one uid from the temp table
  set rowcount 0
  delete from #nodesNotHavingCriteria where nodes = @uid -- delete that uid from the temp table

  -- Do something with the uid you have
  insert into BacktestingCriteria (nodeId,hierarchyViewId,varCriteriaId,pnlCriteriaId) values
 (@uid,16008,16,3)
insert into BacktestingCriteria (nodeId,hierarchyViewId,varCriteriaId,pnlCriteriaId) values
  (@uid,16008,16,4)
end
end

循环继续进行

2 个答案: