TopLink JPA - trailing spaces on Char column

Question

Gurus,
In JDBC you use the following to ignore trailing spaces when querying on Char column:
OracleConnection conn = (OracleConnection) c;
conn.setDefaultFixedString(true);
How to achieve this using TopLink JPA?
Thanks much,
Nicky

Answer 1

Nicky,
I believe you would need to do this in API. Ideally setting these configurations on the properties of the JDBC connection pool is easier but if you wish to do it with TopLink Essentials I would use a session event listener's postAcquireConnection to customize it.
In the persistence.xml you will need to configure your persistence unit to use a session customer like:
        <property name="toplink.session.customizer" value = "mypackage.JDBCConnectionConfig"/>Then you will need to implement this customizer and include it on the classpath of your application:
public class JDBCConnectionConfig implements SessionCustomizer {
    public void customize(Session session) {
        session.getEventManager().addListener(new JDBCConfigEventListener());   
    class JDBCConfigEventListener extends SessionEventAdapter {
        public void postAcquireConnection(SessionEvent event) {
            Connection conn = ((DatabaseAccessor) event.getResult()).getConnection();
            OracleConnection oconn = (OracleConnection) conn;
            oconn.setDefaultFixedString(true);
Note: I did not see setDefaultFixedString in the most recent version of the Oracle JDBC driver
I would definitely look into configuring your data source's connection pool with this property enabled before adding this event listener.
Doug