JDBC如何访问MySQL数据库,并增删查改

Class.forName("com.mysql.cj.jdbc.Driver");

String url = "jdbc:mysql://localhost:3306/****?serverTimezone=UTC";
//****是你要访问的数据库是哪个，mysql版本5.0以上需要在后面加上serverTimezone=UTC
//String url = "jdbc:mysql://localhost:3306/****?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC"; 

String username = "****"; //数据库的用户名
String password = "****";//数据库的密码

Connection con = DriverManager.getConnection(url, username, password);

Statement statement = connection.createStatement();

String sql = "insert into user values(1,'Jackage','857857')";//插入一条数据

int executeUpdate = statement.executeUpdate(sql);//返回值表示改动了几条数据

String sql = "select name,password from user";<em>//查询数据</em>

ResultSet rs = statement.executeQuery(sql);

if (executeUpdate > 0) {
　　System.out.println("操作成功！！！");
} else {
　　System.out.println("未发生改动！！！！");
}

while (rs.next()) {
	String uname = rs.getString("name");
	String upwd = rs.getString("password");
	System.out.println(uname+ "  " + upwd);
}

try {
 if(rs!=null)rs.close()
 if(stmt!=null) stmt.close();
 if(connection!=null)connection.close();
} catch (SQLException e) {
	e.printStackTrace();
}