The default is the forward-only cursor.

默认情况下使用只能前进的游标。

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The simplest type of cursor is the firehose, or forward-only cursor.

游标的最简单类型是流水型(firehose)或仅向前型游标。

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In terms of performance, the forward-only cursor is better than the scrollable cursor.

而在性能方面，只能前进的游标优于可滚动游标。

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In terms of performance, the forward-only cursor is better than the scrollable cursor.

而在性能方面，只能前进的游标优于可滚动游标。

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