longtype.java

一个Java持久层类库

//$Id: LongType.java 7825 2005-08-10 20:23:55Z oneovthafew $
package org.hibernate.type;

import java.io.Serializable;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;
import java.util.Comparator;

import org.hibernate.util.ComparableComparator;
import org.hibernate.dialect.Dialect;
import org.hibernate.engine.SessionImplementor;

/**
 * <tt>long</tt>: A type that maps an SQL BIGINT to a Java Long.
 * @author Gavin King
 */
public class LongType extends PrimitiveType implements DiscriminatorType, VersionType {

	private static final Long ZERO = new Long(0);

	public Serializable getDefaultValue() {
		return ZERO;
	}
	
	public Object get(ResultSet rs, String name) throws SQLException {
		return new Long( rs.getLong(name) );
	}

	public Class getPrimitiveClass() {
		return long.class;
	}

	public Class getReturnedClass() {
		return Long.class;
	}

	public void set(PreparedStatement st, Object value, int index)
	throws SQLException {

		st.setLong( index, ( (Long) value ).longValue() );
	}

	public int sqlType() {
		return Types.BIGINT;
	}

	public String getName() { return "long"; }

	public Object stringToObject(String xml) throws Exception {
		return new Long(xml);
	}

	public Object next(Object current, SessionImplementor session) {
		return new Long( ( (Long) current ).longValue() + 1 );
	}

	public Object seed(SessionImplementor session) {
		return ZERO;
	}

	public Comparator getComparator() {
		return ComparableComparator.INSTANCE;
	}
	
	public String objectToSQLString(Object value, Dialect dialect) throws Exception {
		return value.toString();
	}

	public Object fromStringValue(String xml) {
		return new Long(xml);
	}


}