Configure the CData JDBC Driver for Oracle in a Connection Pool in Tomcat

The CData JDBC Drivers support standard JDBC interfaces to integrate with Web applications running on the JVM. This article details how to connect to Oracle data from a connection pool in Tomcat.

Connect to Oracle Data through a Connection Pool in Tomcat

1. Copy the CData JAR and CData .lic file to $CATALINA_HOME/lib. The CData JAR is located in the lib subfolder of the installation directory.
2. Add a definition of the resource to the context. Specify the JDBC URL here.

   To connect to Oracle, you'll first need to update your PATH variable and ensure it contains a folder location that includes the native DLLs. The native DLLs can be found in the lib folder inside the installation directory. Once you've done this, set the following to connect:

   • Port: The port used to connect to the server hosting the Oracle database.
   • User: The user Id provided for authentication with the Oracle database.
   • Password: The password provided for authentication with the Oracle database.
   • Service Name: The service name of the Oracle database.

   Built-in Connection String Designer

   For assistance in constructing the JDBC URL, use the connection string designer built into the Oracle JDBC Driver. Either double-click the JAR file or execute the jar file from the command-line.

   java -jar cdata.jdbc.oracleoci.jar

   Fill in the connection properties and copy the connection string to the clipboard.

   You can see the JDBC URL specified in the resource definition below.

   <Resource name="jdbc/oracleoci" auth="Container" type="javax.sql.DataSource" driverClassName="cdata.jdbc.oracleoci.OracleOCIDriver" factory="org.apache.tomcat.jdbc.pool.DataSourceFactory" url="jdbc:oracleoci:User=myuser;Password=mypassword;Server=localhost;Port=1521;" maxActive="20" maxIdle="10" maxWait="-1" />

   To allow a single application to access Oracle data, add the code above to the context.xml in the application's META-INF directory.

   For a shared resource configuration, add the code above to the context.xml located in $CATALINA_BASE/conf. A shared resource configuration provides connectivity to Oracle for all applications.

3. Add a reference to the resource to the web.xml for the application. Oracle data JSP jdbc/OracleOCI javax.sql.DataSource Container
4. Initialize connections from the connection pool: Context initContext = new InitialContext(); Context envContext = (Context)initContext.lookup("java:/comp/env"); DataSource ds = (DataSource)envContext.lookup("jdbc/OracleOCI"); Connection conn = ds.getConnection();

More Tomcat Integration

The steps above show how to connect to Oracle data in a simple connection pooling scenario. For more use cases and information, see the JNDI Datasource How-To in the Tomcat documentation.