creditcardtypeusertype.java

hibernate in action 源码 caveatemptor-0.9.5初学者很适合

package org.hibernate.auction.persistence;

import net.sf.hibernate.*;
import org.hibernate.auction.model.CreditCardType;

import java.sql.*;

/**
 * Hibernate custom mapping type for CreditCardType.
 * <p>
 * This mapping type persists credit card type information to a
 * <tt>SMALLINT</tt> database column.
 *
 * @see CreditCardType
 * @author Christian Bauer <[e-mail]>
 */
public class CreditCardTypeUserType implements UserType {

	private static final int[] SQL_TYPES = {Types.SMALLINT};
	public int[] sqlTypes() {  return SQL_TYPES; }
	public Class returnedClass() { return CreditCardType.class; }
	public boolean equals(Object x, Object y) { return x == y; }
	public Object deepCopy(Object value) { return value; }
	public boolean isMutable() { return false; }

	public Object nullSafeGet(ResultSet resultSet,
							  String[] names,
							  Object owner)
			throws HibernateException, SQLException {

		int typeCode = resultSet.getInt(names[0]);
		return resultSet.wasNull() ? null : CreditCardType.getInstance(typeCode);
	}

	public void nullSafeSet(PreparedStatement statement,
							Object value,
							int index)
			throws HibernateException, SQLException {

		if (value == null) {
			statement.setNull(index, Types.SMALLINT);
		} else {
			statement.setInt(index, ((CreditCardType)value).toInteger().intValue());
		}
	}

}