jdbc多种实现方式

1，驱动加载

//注册驱动
//DriverManager.registerDriver(new Driver());此方法被淘汰
Class.forName("com.mysql.jdbc.Driver");

　第一种方法的缺点：

（1）依赖jar包

（2）驱动注册了两次（在 Driver（）里面注册了一次）

2.获取链接

//建立连接2
	public static Connection  getConn2() throws SQLException
	{
		Properties info= new Properties();
		info.setProperty("user", "root");
		info.setProperty("password", "123");
		conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/day06",info);

		return conn;
	}

	//建立连接3
		public static Connection  getConn3() throws SQLException
		{
			Connection cnn=DriverManager.getConnection("jdbc:mysql://localhost:3306/day06？user=root&password=123");
			return conn;
		}

//获取链接
	conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/day06","root","247418");

　　建立连接的三种方式：第三种方式最常用

3.对数据库的操作

//对数据库的操作--选择
	public static ResultSet QueryTest() throws Exception
	{
		rs=sta.executeQuery("select * from users");
		return rs;

	}

	//对数据库的操作--插入
	public static int insertTest() throws Exception
	{
		int num_i=sta.executeUpdate("insert into users values(005,'zhansan','123','zs@sina.com','1980-12-04')");
		return num_i;

	}
	//对数据库的操作--删除
	public static int deleteTest() throws Exception
	{
		int num_d=sta.executeUpdate("delete from users where id='001'");
		return num_d;

	}
	//对数据库的操作--更新
	public static int updateTest() throws Exception
	{
		int num_d=sta.executeUpdate("update users set name='ooo' where id='002'");
		return num_d;

	}

　　4.对结果的操作

//对结果的操作1
		public static void QueryRes1() throws Exception
		{
			while(rs.next())
			{
				User u=new User();
				u.setId(rs.getInt("id"));
				u.setName(rs.getString("name"));
				u.setPassword(rs.getString("password"));
				u.setEmail(rs.getString("email"));
				u.setBirthday(rs.getDate("birthday"));
				al.add(u);
			}

		}

		//对结果的操作2
		public static void QueryRes2() throws Exception
		{
			while(rs.next())
			{
				System.out.println(rs.getObject(1));
				System.out.println(rs.getObject(2));
				System.out.println(rs.getObject(3));
				System.out.println(rs.getObject(4));
				System.out.println(rs.getObject(5));
				System.out.println("-----------------");
			}

		}

　　

package songyan.jdbc.entity;

import java.util.Date;

public class User {
	private int id;
	private String name;
	private String password;
	private String email;
	private Date birthday;

	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
	public Date getBirthday() {
		return birthday;
	}
	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}

}