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Oracle GlassFish Server 3.1 Application Development Guide
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Document Information


Part I Development Tasks and Tools

1.  Setting Up a Development Environment

2.  Class Loaders

3.  Debugging Applications

Part II Developing Applications and Application Components

4.  Securing Applications

5.  Developing Web Services

6.  Using the Java Persistence API

7.  Developing Web Applications

8.  Using Enterprise JavaBeans Technology

9.  Using Container-Managed Persistence

10.  Developing Java Clients

11.  Developing Connectors

12.  Developing Lifecycle Listeners

13.  Developing OSGi-enabled Java EE Applications

Part III Using Services and APIs

14.  Using the JDBC API for Database Access


Using an Initialization Statement

Setting a Statement Timeout

Statement Leak Detection and Leaked Statement Reclamation

Statement Caching

Statement Tracing


Transparent Pool Reconfiguration

Disabling Pooling

Associating Connections with Threads

Custom Connection Validation

Sharing Connections

Marking Bad Connections

Handling Invalid Connections

Connection Wrapping

Wrapping Connections

Obtaining a Physical Connection From a Wrapped Connection

Using the Connection.unwrap() Method

Allowing Non-Component Callers

Using Application-Scoped Resources

Restrictions and Optimizations

Disabling Stored Procedure Creation on Sybase

15.  Using the Transaction Service

16.  Using the Java Naming and Directory Interface

17.  Using the Java Message Service

18.  Using the JavaMail API


Connection Wrapping

The following topics are addressed here:

Wrapping Connections

If the Wrap JDBC Objects option is true (the default), wrapped JDBC objects are returned for Statement, PreparedStatement, CallableStatement, ResultSet, and DatabaseMetaData.

This option ensures that Statement.getConnection() is the same as DataSource.getConnection(). Therefore, this option should be true when both Statement.getConnection() and DataSource.getConnection() are done.

You can specify the Wrap JDBC Objects option in the following ways:

Obtaining a Physical Connection From a Wrapped Connection

The DataSource implementation in the GlassFish Server provides a getConnection method that retrieves the JDBC driver’s SQLConnection from the GlassFish Server’s Connection wrapper. The method signature is as follows:

public java.sql.Connection getConnection(java.sql.Connection con) 
throws java.sql.SQLException

For example:

InitialContext ctx = new InitialContext();
com.sun.appserv.jdbc.DataSource ds = (com.sun.appserv.jdbc.DataSource) 
Connection con = ds.getConnection();
Connection drivercon = ds.getConnection(con); //get physical connection from wrapper
// Do db operations.
// Do not close driver connection.
con.close(); // return wrapped connection to pool.

Using the Connection.unwrap() Method

If the JDK version 1.6 is used, the GlassFish Server supports JDBC 4.0 if the JDBC driver is JDBC 4.0 compliant. Using the Connection.unwrap() method on a vendor-provided interface returns an object or a wrapper object implementing the vendor-provided interface, which the application can make use of to do vendor-specific database operations. Use the Connection.isWrapperFor() method on a vendor-provided interface to check whether the connection can provide an implementation of the vendor-provided interface. Check the JDBC driver vendor's documentation for information on these interfaces.