Data Sources

WebLogic Server maintains a pool of reusable physical database connections to minimize the overhead involved in connecting to a database. All the connections in a pool connect to the same database and use the same username and password for the connections. In order for a Java application to talk to a database, it must first open a connection to the database. Java programs open a connection by using the java.sql.Connection interface. Once the application opens a connection, it can then create statement objects and manage transactions. Clients obtain a Connection object when they request a connection from the connection pool. A Connection object is a logical representation of the actual physical database connection. WebLogic maintains the pooled connections as a collection of PooledConnection objects. Behind the scenes WebLogic associates the client's Connection object to a PooledConnection object.