Understanding the Query API

Table 96-11 summarizes the query support provided by each type of session. For each session type, it shows the type of query operation (create, read, update, delete) that you can perform and whether or not you can execute a DatabaseQuery or Call. For example, using a unit of work, you can use session queries to read and delete; using a server session, you can use session queries to create, read, update, and delete.

Table 96-11 Session Query API Summary

Session	Create	Read	Update	Delete	Execute Database Query	Execute Call
Unit of work
Database
Server
Client

Example 96-4 summarizes the important TopLink packages that provide query and expression support:

Example 96-4 Query and Expression Packages

oracle.toplink.queryframework
oracle.toplink.expressions
oracle.toplink.querykeys
oracle.toplink.descriptors.DescriptorQueryManager