Question

I’ve created a user defined function in hibernate called bitwiseAnd, and registered it in the dialect constructor as follows:

public SQLServerDialect() {
    super();
    registerFunction("bitwiseAnd", new SqlBitwiseFunction("bitwiseAnd", StandardBasicTypes.INTEGER));
}

I needed to do the same for Oracle as we support that too, and because they have different syntax’s with regards to bitwise operations. I was hoping to use this in the @DiscriminatorFormula, but it doesn’t seem to see the registered function. Is this possible, or does the discriminator formula only use native SQL?

Thanks,
R.

Answer 1

The javadoc of DiscriminatorFormula links to the javadoc of Formula, which contains the following:

The formula has to be a valid SQL fragment.

So yes, the formula must be valid SQL, and not HQL.