Set the cursor to be a scrollable cursor using the PDO::ATTR_CURSOR attribute

使用PDO::ATTR_CURSOR属性将游标设置为可滚动游标

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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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However, in some cases, you will need to read cursors both forward and backward, in which case you should use scrollable cursor.

但某些情况下，您需要游标既能向前又能向后，此时需要使用可滚动游标。

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However, in some cases, you will need to read cursors both forward and backward, in which case you should use scrollable cursor.

但某些情况下，您需要游标既能向前又能向后，此时需要使用可滚动游标。

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