Configure the CData JDBC Driver for Greenplum 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 Greenplum data from a connection pool in Tomcat.

Connect to Greenplum 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 Greenplum, set the Server, Port (the default port is 5432), and Database connection properties and set the User and Password you wish to use to authenticate to the server. If the Database property is not specified, the default database for the authenticate user is used.

   Built-in Connection String Designer

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

   java -jar cdata.jdbc.greenplum.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/greenplum" auth="Container" type="javax.sql.DataSource" driverClassName="cdata.jdbc.greenplum.GreenplumDriver" factory="org.apache.tomcat.jdbc.pool.DataSourceFactory" url="jdbc:greenplum:User=user;Password=admin;Database=dbname;Server=127.0.0.1;Port=5432;" maxActive="20" maxIdle="10" maxWait="-1" />

   To allow a single application to access Greenplum 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 Greenplum for all applications.

3. Add a reference to the resource to the web.xml for the application. Greenplum data JSP jdbc/Greenplum 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/Greenplum"); Connection conn = ds.getConnection();

More Tomcat Integration

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