February 01, 2006
Native Queries for Persistent Objects
(a) String oql = "select * from student in AllStudents where student.age < 20"; OQLQuery query = new OQLQuery(oql); Object students = query.execute();(b) Query query = persistenceManager.newQuery(Student.class, "age < 20"); Collection students = (Collection)query.execute();(c)
Query query = database.Query();
query.Constrain(typeof(Student));
query.Descend("age").Constrain(20).Smaller();
IList students = query.Execute();
Example 2: (a) Object Query Language (OQL); (b) JDO Query Language (JDOQL); and (c) db4o SODA (using C#).
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