JDBC

JDBC连接数据库（mysql）

public class Jdbc{
public static final String url="jdbc:mysql:///数据库名?serverTimezone=GMT%2B8characterEncoding=utf8";

public static final String username="账号";

public static final String password="密码";

public static void main(String[]args){
        //1、加载驱动
        Class.forName("com.mysql.cj.jdbc.Driver");
        //2、连接数据库
        Connection conn=DriverManager.getConnection(Jdbc.url,Jdbc.username,Jdbc.password);
        //3、创建申明
        Statement st=conn.createStatement();
        //4、执行SQL语句
        ResultSet rs=st.executeQuery("SQL语句");
        //5、遍历结果集
        while(rs.next()){
        String id=rs.getString("字段1");
        String name=rs.getString("字段2");
        String gender=rs.getString("字段3");
        System.out.println(id+","+name+","+gender);
        }
        //6、关闭资源
        rs.close();
        st.close();
        conn.close();
    }
}