The JDBC Connection and Transaction Model
Session and transaction capabilities for SQL are handled through
JDBC procedures, not by SQL commands.
JDBC defines a system session and transaction model for database access.
A session is the duration of one connection to the database and is
handled by a JDBC Connection object.
A Connection object represents a connection with a database.
A transaction is a set of one or more SQL statements that make up a logical unit of work that you can either commit or roll back and that will be recovered in the event of a system failure.