How can I create a (human readable) string representation of Predicates, that shows me the logical operands AND/OR/NOT as well as the attributes and parameter placeholders involved?
There is no need for a SQL or platform specific transformation.
regards
This works fine for me with EclipseLink 2.3/2.4:
import org.eclipse.persistence.internal.jpa.querydef.SelectionImpl;
public static String getPredicateAsString(final Predicate predicate) {
if (predicate == null) {
return null;
}
if (!(predicate instanceof SelectionImpl<?>)) { // type guard
return "not supported";
}
return ((SelectionImpl<?>) predicate).getCurrentNode().toString();
}
Sample output from getPredicateAsString:
Logical operator [ AND ]
Relation operator [ <> ]
Query Key age
Base model.Person
Constant 42
Function operator [(, IS NOT NULL)]
Query Key currentJob
Base model.Employer