connecting to derby database with tomcat as the server

Question

How do i connect to derby database (that comes with the netbeans) ? I am using Tomcat as the server. Earlier i used the following statements to connect to the derby database,but then i used glassfish as the server.

Context context = new InitialContext();
DataSource ds = (DataSource)context.lookup("java:comp/env/jdbc/PollDatasource");
Connection connection = ds.getConnection();

But now using Tomcat as the server i am unaware how to do this.

Note : Tomcat and Derby are pre installed with netbeans IDE that i am using currently

Answer 1

In Tomcat find conf/context.xml , then edit and write something like this:

<Resource name="jdbc/PollDatasource" auth="Container" type="javax.sql.DataSource"
    driverClassName="com.YourDriver" 
    url="jdbc:derby://localhost:1527/nameOfTheDatabase;create=true"
    username="username" password="password" maxActive="20" 
    maxIdle="10" maxWait="-1" />

Note 1: With the above URL the driver will be org.apache.derby.jdbc.ClientDriver

Note 2 : You can also add the above information in META-INF/context.xml of your project. This becomes application specific.If you add the information in tomcat's context.xml that becomes global.

Note 3: Download the jar from this website .Download db-derby-10.9.1.0-bin.zip.It contains many files, including derby.jar and derbyclient.jar (along with much documentation).derbyclient.jar contains our friend org.apache.derby.jdbc.ClientDriver.class . derby.jar contains org.apache.derby.jdbc.EmbeddedDriver . Keep the downloaded jar in lib folder of Tomcat.

and in your application web.xml "resource-ref":

<resource-ref>
    <description>my connection</description>
    <res-ref-name>jdbc/PollDatasource</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
  </resource-ref>

You may want to look at these questions :

• Isn't it necessary to mention the name of archive in the Resource tag?
• When is the tag I added in context.xml gets read?
• What are steps followed in the look-up? what is looked first web.xml or context.xml?

Answer 2

You need to:

1) Copy your derbyclient-*.jar to ${TOMCAT_HOME}/lib .

2) Edit your server.xml and add the following lines to the section GlobalNamingResources:

 <Resource auth="Container" 
           driverClassName="org.apache.derby.jdbc.EmbeddedDriver" 
           maxActive="8" maxIdle="4" 
           name="jdbc/my-ds" type="javax.sql.DataSource" 
           url="jdbc:derby:mydb;create=true" 
           username="myuser" password="mypassword" />

3) In your context definition, add:

 <Context docBase="myapp"
          path="/myapp"
          reloadable="true"
          ...>
    <ResourceLink name="jdbc/my-ds"
                  global="jdbc/my-ds"
                  type="javax.sql.DataSource" />
 </Context>

4) Restart Tomcat.

Answer 3

The example you have requires JNDI. See the relevant tomcat versions docs on setting that up.

Or use a connection string, here's a page from derby docs http://db.apache.org/derby/integrate/plugin_help/derby_app.html