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Competition to use the same database is a common occurrence and can lead to performance degradation For example, multiple applications might attempt to access a database simultaneously The DBMS may not respond quickly for a number of reasons, one of which might be that database connections are not available Rather than wait for a delayed response from the DBMS, the J2ME application can set a timeout period after which the DriverManager will cease trying to connect to the database
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The public static void DriverManagersetLoginTimeout(int seconds) method can be used by the J2ME application to establish the maximum time the DriverManager waits for a response from a DBMS before timing out Likewise, the public static int DriverManagergetLoginTimeout() method is used to retrieve from the DriverManager the maximum time the DriverManager is set to wait until it times out The DriverManagergetLoginTimeout() returns an int that represents seconds
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Connecting to a database is performed on a per-client basis That is, each client must open its own connection to a database, and the connection cannot be shared with unrelated clients For example, a client that needs to interact frequently with a database must either open a connection and leave the connection open during processing, or open or close and reconnect each time the client needs to access the database Leaving a connection open might prevent another client from accessing the database should the DBMS have a limited number of connections available Connecting and reconnecting is simply time consuming and causes performance degradation The release of the JDBC 21 Standard Extension API introduced connection pooling to address the problem A connection pool is a collection of database connections that are opened once and loaded into memory so these connections can be reused without having to reconnect to the DBMS Clients use the DataSource interface to interact with the connection pool The connection pool itself is implemented by the application server and other J2EE-specific technologies, which hide details on how the connection pool is maintained from the client There are two types of connections made to the database The first is the physical connection, which is made by the application server using PooledConnection objects PooledConnection objects are cached and reused The other type of connection is the logical connection A logical connection is made by a client calling the DataSourcegetConnection() method, which connects to a PooledConnection object that has already made a physical connection to the database Listing 10-8 illustrates how to access a connection from a connection pool A connection pool is accessible by using the Java Naming and Directory Interface (JNDI) JNDI provides a uniform way to find and access naming and directory services independent of any specific naming or directory service First, a J2ME application must obtain a handle to the JNDI context, which is illustrated in the first statement in this code segment Next, the JNDI lookup() method is called and is passed the name of the connection pool, which returns the DataSource object, called pool in this example The getConnection() method of the DataSource object is then called, as illustrated earlier in this chapter The getConnection() returns the logical connection to the database, which is used by the J2ME application to access the database The close() method of the DataSource object is called once when the J2ME application is finished accessing the database The close() method closes the logical connection to
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the database and not the physical database connection This means that the same physical connection can be used by the next J2ME application that needs access to the database
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Listing 10-8 Connecting to a database using a connection pool Context ctext = new InitialContext(); DataSource pool = (DataSource) ctextlookup("java:comp/env/jdbc/pool"); Connection db = poolgetConnection(); // Place code to interact with the database here dbclose();
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