游标操作时进行Update应注意的一个问题
在进行游标操作时,如果你使用了Order by 子句,但Order by 的字段没有索引, 则会导至游标为只读属性, 并且不能指定
为for Update状态.
解决办法有去掉Order by 子句或者对Order by的字段进行索引.
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