Connecting to a Data Source
Applications must first be connected to a database before performing any database operation. As explained earlier, connections are made ready by the container, at startup, through the creation of a connection pool.
Connections are created using the DataSource object. Applications need to locate a DataSource object, before creating a Connection. Applications locate a DataSource through the JNDI service. The following is an example of these steps:
// Connect to the default JNDI service and establish a context Context ctx = new InitialContext(); // Lookup the DataSource for the configured database javax.sql.DataSource ds = (javax.sql.DataSource) ctx.lookup ("java:comp/env/jdbc/styejbDB"); // Make a connection to the ...Get Sams Teach Yourself EJB in 21 Days now with the O’Reilly learning platform.
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