With the deep study of modeling done on the query conversion mechanism, the solution is provided to achieve mapping between integrated query interface and WDB query interface. Thereby, efficiency of query conversion has been improved.
3.对查询转换机制进行了模型化的深入研究,并给出解决方案,实现了集成查询接口与WDB查询接口之间的转换,提高了查询转换的效率。
参考来源 - Deep Web数据集成研究及其在购书领域中的应用·2,447,543篇论文数据，部分数据来源于NoteExpress
By making data types consistent within the DDL, there is less overhead associated with conversion of data at query run time.
通过在DDL中确保数据类型一致，在查询运行当中与数据转换相关的开销会比较小。
Listing 9 shows how to transform a user-provided query in order to add the conversion step.
清单9显示了如何转换一个用户提供的查询，以加入转换步骤。
It not only supports several major currencies query, real-time update rate, multi-currency conversion, historical trends and many other features, simple and practical.
它不仅支持几种主要的货币汇率查询，即时更新汇率，多种货币转换，历史走势等许多功能，简洁实用。
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