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序号:24322 发表者:rafael 发表日期:2002-12-11 17:53:11
<br>主题:CRecordset::useMultiRowFetch的问题,谁英文好来帮我看看?
<br>内容:msdn 上的解释:<BR>CRecordset::useMultiRowFetch Implement bulk row fetching to allow multiple rows to be retrieved in a single fetch operation. This is an advanced feature designed to improve performance; however, bulk record field exchange is not supported by ClassWizard. This option is mutually exclusive with CRecordset::optimizeBulkAdd. Note that if you specify CRecordset::useMultiRowFetch, then the option CRecordset::noDirtyFieldCheck will be turned on automatically (double buffering will not be available); on forward-only recordsets, the option CRecordset::useExtendedFetch will be turned on automatically. For more information about bulk row fetching, see the articleRecordset: Fetching Records in Bulk (ODBC) in Visual C++ Programmer’s Guide.<BR>
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<font color=red>答案被接受</font><br>回复者:骆驼之沙漠王子 回复日期:2002-12-14 11:16:56
<br>内容:CRecordset::useMultiRowFetch,通过多条记录获取的方法允许用户通过一次提取操作而返回多条记录。他是为提高操作效率而设计的另一个特点。然而系统提供的向导不支持多纪录字段的互换。CRecordset::useMultiRowFetch 和 CRecordset::optimizeBulkAdd是互相排斥的,同一时间只有一个有效。同时要注意的是,当设置了CRecordset::useMultiRowFetch属性,那么CRecordset::noDirtyFieldCheck 属性要设成自动的(双重缓存是无效的)。如果recordsets设置了forward-only 属性,那么CRecordset::useExtendedFetch将会设成自动的。要想进一步了解“多纪录获取“的方法,请详看articleRecordset: Fetching Records in Bulk (ODBC) in Visual C++ Programmer’s Guide.<BR>
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回复者:rafael 回复日期:2002-12-15 06:10:15
<br>内容:谢谢
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