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Hibernate example source code file (NvlFunction.java)
The Hibernate NvlFunction.java source code/* * Hibernate, Relational Persistence for Idiomatic Java * * Copyright (c) 2010, Red Hat Inc. or third-party contributors as * indicated by the @author tags or express copyright attribution * statements applied by the authors. All third-party contributions are * distributed under license by Red Hat Inc. * * This copyrighted material is made available to anyone wishing to use, modify, * copy, or redistribute it subject to the terms and conditions of the GNU * Lesser General Public License, as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License * for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this distribution; if not, write to: * Free Software Foundation, Inc. * 51 Franklin Street, Fifth Floor * Boston, MA 02110-1301 USA */ package org.hibernate.dialect.function; import java.util.List; import org.hibernate.QueryException; import org.hibernate.engine.spi.Mapping; import org.hibernate.engine.spi.SessionFactoryImplementor; import org.hibernate.type.Type; /** * Emulation of <tt>coalesce() on Oracle, using multiple nvl() calls * * @author Gavin King */ public class NvlFunction implements SQLFunction { public boolean hasArguments() { return true; } public boolean hasParenthesesIfNoArguments() { return true; } public Type getReturnType(Type argumentType, Mapping mapping) throws QueryException { return argumentType; } public String render(Type argumentType, List args, SessionFactoryImplementor factory) throws QueryException { int lastIndex = args.size()-1; Object last = args.remove(lastIndex); if ( lastIndex==0 ) { return last.toString(); } Object secondLast = args.get(lastIndex-1); String nvl = "nvl(" + secondLast + ", " + last + ")"; args.set(lastIndex-1, nvl); return render( argumentType, args, factory ); } } Other Hibernate examples (source code examples)Here is a short list of links related to this Hibernate NvlFunction.java source code file: |
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