Data source lookups for enterprise beans and Web modules

During either application assembly or deployment, bind the resource reference to the JNDI name of the actual resource in the run-time environment. We can take this action in the assembly tool or as one of the steps during installation of the application EAR file.

Bean-managed persistence bean

When developing the bean-managed persistence (BMP) bean you generally lack knowledge about the name of the data source on the target application server. In the code, do not look up the data source directly. Instead, you look up the resource reference from the java:comp/env namespace file. Let us assume that you look up the resource reference named ref/ds as illustrated in the code below.

javax.sql.DataSource dSource = (javax.sql.DataSource)((new InitialContext()).lookup("java:comp/env/ref/ds"));

In the assembly tool, specify the name ref/ds in the Resource Reference page on the General Tab. If we know the name of the data source we can specify it in this Resource References page on the Bindings Tab. Note that if we do not specify it here , provide this JNDI name when you install the application EAR file.

Container-managed persistence bean

The data source binding process for the container-managed persistence (CMP) bean is the same process that you perform for bean-managed persistence (BMP) beans. Use the data source JNDI name as a WebSphere binding property for each bean during application assembly.

Servlets and JSPs Files

In a servlet application, you look up the data source exactly as you look it up in the BMP bean case.

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Related concepts

Data sources
Unshareable and shareable connections

 

Related tasks

Create and configuring a JDBC provider and data source using the Java Management Extensions API
Set data access for the Application Client
Set a resource reference
Assembling data access applications
Migrate applications to use data sources of the current Java EE Connector Architecture (JCA)
Set a JDBC provider and data source