Using Oracle XMLType column in hibernate

Question

I need to map Oracle XMLType column to hibernate entity class. There is a working (and I think well-known) solution that involves implementing UserType; however

Answer 1

To simplify Celso's answer further, one can avoid creating a custom function by using Oracle's built-in function

XMLType.createxml(?)

that can handle NULLs.

So the following annotations combined with Celso's custom dialect class works well.

    @Lob
    @ColumnTransformer(read = "NVL2(EVENT_DETAILS, (EVENT_DETAILS).getClobVal(), NULL)", write = "XMLType.createxml(?)")
    @Column(name = "EVENT_DETAILS")
    private String details;

You might also have to register the clob as xmltype in your custom dialect. So effectively you will have the following:

public class OracleDialectExtension extends org.hibernate.dialect.Oracle10gDialect {
    public OracleDialectExtension() {
        super();
        registerColumnType(Types.CLOB, "xmltype");
    }

    @Override
    public boolean useInputStreamToInsertBlob() {
        return false;
    }
}

Ensure to set your custom dialect in your hibernate configuration's session-factory property list: