jodd-db/src/main/java/jodd/db/oom/dao/GenericDao.java
public <ID> void decreaseProperty(final Class entityType, final ID id, final String name, final Number delta) {
		query(dbOom.entities().increaseColumn(entityType, id, name, delta, false)).autoClose().executeUpdate();
	}
public <ID> void decreaseProperty(final Class entityType, final ID id, final String name, final Number delta) {
		query(dbOom.entities().increaseColumn(entityType, id, name, delta, false)).autoClose().executeUpdate();
	}
Decreases a property.