Safe Query Objects: Statically-Typed Objects as Remotely-Executable Queries
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author = {William Cook and Siddhartha Rai},
title = {Safe Query Objects: Statically-Typed Objects as Remotely-Executable Queries},
year = {}
}
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Abstract:
When building scalable systems that involve general-purpose computation and persistent data, object-oriented languages and relational databases are often essential components. Yet the impedance mismatch between these technologies has not been completely overcome by existing integration approaches. Call level interfaces like ODBC and JDBC are an unsafe and fragile form of metaprogramming: database queries are constructed at runtime as strings and executed as programs against the database engine. Object/relational mapping and persistent object systems do not support query shipping, in which complex queries are sent to the database for execution. This paper presents safe query objects, an integrated approach to impedance mismatch that allows query behavior to be defined using statically-typed objects and methods. In addition, safe query objects support query shipping by automatically generating code to execute queries remotely in a relational database. A concrete implementation of this solution is presented using the OpenJava macro language and Java Data Objects.
