| 摘要 |
A computer program for automatically generating queries to a database management system (DBMS) is disclosed. The computer program receives a high level specification of the data sought to be retrieved from an application program. The high level specification includes the columns from which data is sought, and any constraints on the data to be retrieved from those columns such as filter constraints. The computer program also receives a context for the columns to be queried, so that it can be determined which tables of the DBMS the columns are associated with. The computer program further receives a specification of the schema of the DBMS, with the schema specifying the relationship between the various data storage entities of the DBMS. Using the high level specification and the schema, the computer program automatically generates queries to the DBMS seeking to reduce the complexity of the queries to speed execution, and to reduce the number of round trips between the computer program and the DBMS, also to enhance speed. For this purpose, queries may be separated into primary and secondary queries, and batched together, with secondary queries using data retrieved in a primary query in order to retrieve further data.
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