JAVA数据库编程（数据查询）

java数据库编程中数据的查询：

import java.beans.Statement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;

import org.omg.PortableServer.ID_ASSIGNMENT_POLICY_ID;


public class ResultSetDemo {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Connection conn = null;
		java.sql.Statement stmt = null;
		ResultSet rs = null;
		String sql="select * from student";
		try {
			Class.forName("com.mysql.jdbc.Driver");
			System.out.println("驱动加载成功");
			
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
			// TODO: handle exception
		}
		
		try {
			
			conn=DriverManager.getConnection("jdbc:mysql://localhost/student?user=root&password=123456");
			System.out.println("数据库连接成功");
			stmt=conn.createStatement();
			rs=((java.sql.Statement) stmt).executeQuery(sql);
			System.out.println("获得查询");
			int i=1;
			while(rs.next())
			{
				System.out.println("第"+(i++)+"条记录");
				System.out.println("id="+rs.getString(1)+"name="+rs.getString(2));
			}
			
			
		} catch (SQLException e1) {
			e1.printStackTrace();
			// TODO: handle exception
		}
		finally
		{
			try {
				if(rs!=null)
					rs.close();
				if(stmt!=null)
					stmt.close();
				if(conn!=null)
					conn.close();
					
				
				
				
			} catch (Exception e) {
				// TODO: handle exception
			}
		}
		System.out.println("over");
		

	}

}