Save data with EntityManager

Question

Hi,
I would like to save data to a database with EntityManager. But not in the sun-appserv-samples (what the Netbeans uses). Is it possible to choose another database?
Thanks in advance any help.

Answer 1

First of all I would like to thank you for your replies. You're absolutely right. I don't understand every step I do. But I would like to understand.
In the first step I made an Enterprise Application Project. After that I made a JDBC Connection Pool on the part of the teszt-ejb / Server Resource. Here is the glassfish-resources.xml. Maybe it'll help.
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE resources PUBLIC "-//GlassFish.org//DTD GlassFish Application Server 3.1 Resource Definitions//EN" "http://glassfish.org/dtds/glassfish-resources_1_5.dtd">
<resources>
  <jdbc-connection-pool allow-non-component-callers="false" associate-with-thread="false" connection-creation-retry-attempts="0" connection-creation-retry-interval-in-seconds="10" connection-leak-reclaim="false" connection-leak-timeout-in-seconds="0" connection-validation-method="auto-commit" datasource-classname="oracle.jdbc.pool.OracleDataSource" fail-all-connections="false" idle-timeout-in-seconds="300" is-connection-validation-required="false" is-isolation-level-guaranteed="true" lazy-connection-association="false" lazy-connection-enlistment="false" match-connections="false" max-connection-usage-count="0" max-pool-size="32" max-wait-time-in-millis="60000" name="connectionPool" non-transactional-connections="false" pool-resize-quantity="2" res-type="javax.sql.DataSource" statement-timeout-in-seconds="-1" steady-pool-size="8" validate-atmost-once-period-in-seconds="0" wrap-jdbc-objects="false">
    <property name="URL" value="jdbc:oracle:thin:@localhost:1521"/>
    <property name="User" value="admin"/>
    <property name="Password" value="admin"/>
  </jdbc-connection-pool>
</resources>