Object Prefetch Filter - A Pattern for Improving the Performance of Object Retrieval Using Object-Relational Mapping Tools
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چکیده
Object-relational mapping tools provide a bridge between objectoriented programming languages and relational database systems. Although the concepts of object-relational mapping are well understood, the performance of object retrieval still is a crucial point in using the tools. Prefetching objects is a means to improve the performance, in particular to avoid the socalled n+1 selects problem. This problem arises when a list of objects is retrieved from a database and for each object another database call needs to be executed to retrieve referenced objects. This paper presents a pattern that, if applied to the implementation of a mapping tool, gives application developers the choice to explicitly define for every query which portion of a network of objects to prefetch.
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تاریخ انتشار 2007