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Connect to PostgreSQL Data from a Connection Pool in Jetty

The CData JDBC Driver for PostgreSQL supports connection pooling: This article shows how to connect faster to PostgreSQL data from Web apps in Jetty.

The CData JDBC driver for PostgreSQL is easy to integrate with Java Web applications. This article shows how to efficiently connect to PostgreSQL data in Jetty by configuring the driver for connection pooling. You will configure a JNDI resource for PostgreSQL in Jetty.

Configure the JDBC Driver for Salesforce as a JNDI Data Source

Follow the steps below to connect to Salesforce from Jetty.

  1. Enable the JNDI module for your Jetty base. The following command enables JNDI from the command-line:

    java -jar ../start.jar --add-to-startd=jndi
  2. Add the CData and license file, located in the lib subfolder of the installation directory, into the lib subfolder of the context path.
  3. Declare the resource and its scope. Enter the required connection properties in the resource declaration. This example declares the PostgreSQL data source at the level of the Web app, in WEB-INF\jetty-env.xml.

    <Configure id='postgresqldemo' class="org.eclipse.jetty.webapp.WebAppContext"> <New id="postgresqldemo" class="org.eclipse.jetty.plus.jndi.Resource"> <Arg><Ref refid="postgresqldemo"/></Arg> <Arg>jdbc/postgresqldb</Arg> <Arg> <New class="cdata.jdbc.postgresql.PostgreSQLDriver"> <Set name="url">jdbc:postgresql:</Set> <Set name="User">postgres</Set> <Set name="Password">admin</Set> <Set name="Database">postgres</Set> <Set name="Server">127.0.0.1</Set> <Set name="Port">5432</Set> </New> </Arg> </New> </Configure>

    PostgreSQL への接続には、Server、Port(デフォルトは5432)、Database、およびUser、Password のプロパティを設定します。Database プロパティが設定されない場合には、User のデフォルトデータベースに接続します。

  4. Configure the resource in the Web.xml:

    jdbc/postgresqldb javax.sql.DataSource Container
  5. You can then access PostgreSQL with a lookup to java:comp/env/jdbc/postgresqldb: InitialContext ctx = new InitialContext(); DataSource mypostgresql = (DataSource)ctx.lookup("java:comp/env/jdbc/postgresqldb");

More Jetty Integration

The steps above show how to configure the driver in a simple connection pooling scenario. For more use cases and information, see the Working with Jetty JNDI chapter in the Jetty documentation.

 
 
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