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Hibernate example source code file (AbstractSelectingDelegate.java)

This example Hibernate source code file (AbstractSelectingDelegate.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Hibernate tags/keywords

abstractselectingdelegate, binder, insertgeneratedidentifierdelegate, io, jdbc, object, object, preparedstatement, preparedstatement, resultset, serializable, sessionimplementor, sessionimplementor, sql, sqlexception, sqlexception, string

The Hibernate AbstractSelectingDelegate.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2008, Red Hat Middleware LLC 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 Middleware LLC.
 *
 * 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.id.insert;
import java.io.Serializable;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.id.PostInsertIdentityPersister;
import org.hibernate.pretty.MessageHelper;

/**
 * Abstract InsertGeneratedIdentifierDelegate implementation where the
 * underlying strategy requires an subsequent select after the insert
 * to determine the generated identifier.
 *
 * @author Steve Ebersole
 */
public abstract class AbstractSelectingDelegate implements InsertGeneratedIdentifierDelegate {
	private final PostInsertIdentityPersister persister;

	protected AbstractSelectingDelegate(PostInsertIdentityPersister persister) {
		this.persister = persister;
	}

	public final Serializable performInsert(String insertSQL, SessionImplementor session, Binder binder) {
		try {
			// prepare and execute the insert
			PreparedStatement insert = session.getTransactionCoordinator()
					.getJdbcCoordinator()
					.getStatementPreparer()
					.prepareStatement( insertSQL, PreparedStatement.NO_GENERATED_KEYS );
			try {
				binder.bindValues( insert );
				insert.executeUpdate();
			}
			finally {
				insert.close();
			}
		}
		catch ( SQLException sqle ) {
			throw session.getFactory().getSQLExceptionHelper().convert(
			        sqle,
			        "could not insert: " + MessageHelper.infoString( persister ),
			        insertSQL
				);
		}

		final String selectSQL = getSelectSQL();

		try {
			//fetch the generated id in a separate query
			PreparedStatement idSelect = session.getTransactionCoordinator()
					.getJdbcCoordinator()
					.getStatementPreparer()
					.prepareStatement( selectSQL, false );
			try {
				bindParameters( session, idSelect, binder.getEntity() );
				ResultSet rs = idSelect.executeQuery();
				try {
					return getResult( session, rs, binder.getEntity() );
				}
				finally {
					rs.close();
				}
			}
			finally {
				idSelect.close();
			}

		}
		catch ( SQLException sqle ) {
			throw session.getFactory().getSQLExceptionHelper().convert(
			        sqle,
			        "could not retrieve generated id after insert: " + MessageHelper.infoString( persister ),
			        insertSQL
			);
		}
	}

	/**
	 * Get the SQL statement to be used to retrieve generated key values.
	 *
	 * @return The SQL command string
	 */
	protected abstract String getSelectSQL();

	/**
	 * Bind any required parameter values into the SQL command {@link #getSelectSQL}.
	 *
	 * @param session The session
	 * @param ps The prepared {@link #getSelectSQL SQL} command
	 * @param entity The entity being saved.
	 * @throws SQLException
	 */
	protected void bindParameters(
			SessionImplementor session,
	        PreparedStatement ps,
	        Object entity) throws SQLException {
	}

	/**
	 * Extract the generated key value from the given result set.
	 *
	 * @param session The session
	 * @param rs The result set containing the generated primay key values.
	 * @param entity The entity being saved.
	 * @return The generated identifier
	 * @throws SQLException
	 */
	protected abstract Serializable getResult(
			SessionImplementor session,
	        ResultSet rs,
	        Object entity) throws SQLException;

}

Other Hibernate examples (source code examples)

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