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A database session represents an application's dialog with a relational database. This chapter is a comprehensive reference for database sessions in TopLink. It describes the fundamental concepts required to connect to the database and to perform queries as well as optional and advanced session and query properties.
We'll use it in this tutorial to introduce the concept of query creation. In later tutorials we'll examine the Design view which facilitates the creation of more sophisticated queries. A database query is a piece of code (a query) that is sent to a database in order to get information back from the database. It is used as the way of retriving the information from database <br /><br />A database query is basically a question that you ask the database.