jdbc中可滚动数据定位方法

package jdbcDay03;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class TestScroll {
	public static void main(String[] args) {
		Connection conn=null;
		Statement stmt=null;
		try {
			String sql="select * from mytemp";
			conn=ConnectionUtils.openConnection();
			stmt=conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,		//可滚动的，不可保存的
					ResultSet.CONCUR_READ_ONLY);	//并发只读
			ResultSet rs=stmt.executeQuery(sql);
			if(rs.first())
			System.out.println("1      "+rs.getString("user_id"));
			if(rs.next())
				System.out.println("2      "+rs.getString("user_id"));
			rs.absolute(99);
			System.out.println("99       "+rs.getString("user_id"));
			rs.relative(-20);				//相对于99减去10条
			System.out.println("79     "+rs.getString("user_id"));
//			rs.beforeFirst();					//结果集合已经耗尽
			rs.previous();					//前一条
//			rs.afterLast();
			System.out.println("78      "+rs.getString("user_id"));
			if(rs.last())
			System.out.println("99          "+rs.getString("user_id"));
			stmt.close();
			conn.close();
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
}