bigintegertype.java

hibernate-3.1.3-all-src.zip 面向对象的访问数据库工具

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

import java.math.BigDecimal;
import java.math.BigInteger;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Types;

import org.hibernate.EntityMode;
import org.hibernate.HibernateException;
import org.hibernate.dialect.Dialect;

/**
 * <tt>big_integer</tt>: A type that maps an SQL NUMERIC to a
 * <tt>java.math.BigInteger</tt>
 * @see java.math.BigInteger
 * @author Gavin King
 */
public class BigIntegerType extends ImmutableType implements DiscriminatorType {

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

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

	public Object get(ResultSet rs, String name)
	throws HibernateException, SQLException {
		//return rs.getBigDecimal(name).toBigIntegerExact(); this 1.5 only. 
		BigDecimal bigDecimal = rs.getBigDecimal(name);
		return bigDecimal==null ? null : 
			bigDecimal.setScale(0, BigDecimal.ROUND_UNNECESSARY).unscaledValue();
	}

	public void set(PreparedStatement st, Object value, int index)
	throws HibernateException, SQLException {
		st.setBigDecimal( index, new BigDecimal( (BigInteger) value ) );
	}

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

	public String toString(Object value) throws HibernateException {
		return value.toString();
	}

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

	public boolean isEqual(Object x, Object y) {
		return x==y || ( x!=null && y!=null && ( (BigInteger) x ).compareTo( (BigInteger) y )==0 );
	}

	public int getHashCode(Object x, EntityMode entityMode) {
		return ( (BigInteger) x ).intValue();
	}

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

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


}