jsp学习--jdbc数据库连接

import java.sql.*;


public class SqlConnect {

	private static Object Results;

	public static void main(String[] args) {
		//驱动注册
		try {
			Class.forName("org.apache.derby.jdbc.ClientDriver");
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		//链接数据库
		Connection con = null; //数据库链接
		Statement smt = null; //数据库表达式
		ResultSet rst = null; //结果集
		
		//连接数据库
		try {
			con = java.sql.DriverManager.getConnection("jdbc:derby://localhost:1527/myeclipse","classiccars","classiccars");
		
		
		//数据库操作/添加/删除
		
			smt = con.createStatement();
		    rst = smt.executeQuery("select * from student");
			//查里面的数据
			while (rst != null && rst.next()){
				System.out.println("学生编号"+rst.getString("id") );//表示一行中的第一列。getString字段。123一行中的第一列第二列
				System.out.println("学生姓名:"+rst.getString(2));//表示一行中的第二列。getString("username")
				System.out.println("password"+rst.getString("password"));
			}
		
		
			int rows = smt.executeUpdate("insert into student(username,password) values('zufe','z')");
			System.out.println(rows);
			int rows2 = smt.executeUpdate("delete  from student where id=1");
			System.out.println("插入了"+rows2);
		}
		catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			try {
				con.close();
			} catch (Exception e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
			try {
				smt.close();
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			try {
				rst.close();
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}

}