record not found or changed by another user 没有主键的表解决(外篇)
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在FireBird中，使用ClientDataset+DatasetProvider+DBEXPress组件开发，如果表没有主键，ClientDataset的IndexName设为
Default_Order,DatasetProvider的UpdateMode设为upWherechaned时，在存取记录时只能修改。要能正确更新，需为表增加一个
Unique约束，然后在ClientDataset的IndexFieldNames设为建立的索引，DatasetProvider的UpdateMode设为upWhereAll，才能
正确更新记录.
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