什么是多行获取？
If DB2 does not need to sort, then all of the work for finding a qualified row (or rows with multi-row FETCH) will be done at each FETCH.
如果DB 2不需要排序，那么所有寻找一个符合条件的行(或者有多行FETCH的行)的工作在每个FETCH中就可以完成。
The default value for this property is true, which means the driver will always try to use multi-row fetch (MRF) for scrollable cursors if the server supports it.
该属性的默认值是true，这意味着在服务器支持的情况下，驱动程序将尝试对可滚动游标使用多行获取(MRF)。
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