| 摘要 |
A computer system has an interface to one or more databases, one or more base query objects, query objects, compound queries, annotator objects and graphical user interfaces (GUI's). The base query objects have one or more base query object methods, base variables, and base objects, the base query object methods being specific to the specific database and capable of querying the specific database. Each of the query objects derived from one of the base objects, and has a query type, one or more query object methods, query object variables, and query object objects. Each query object method is capable of querying a specific database to obtain a type result having the respective type. The compound query has one or more compound query methods, compound query variables, and compound query object objects. The operator objects, are derived from one of the base query objects that are used with the specific database. (GUI) has one or more query elements with one or more operators. The query elements, operators, and conditions are user selectable. Each query element, operates on the query object with the same type as the query element to create an instance of the query object with the query element. The compound query object instance uses the instances and the operator object instances to create an a query expression for the specific database. Therefore the input in the GUI is translated into a single compound query object.
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