【java基础学习】数据库编程

MySQL数据库查询

 import java.sql.*;
 public class JdbcDemo1{
     public static void main(String[] args){
         try{
             //1.加载数据库驱动程序
             Class.forName("org.gjt.mm.mysql.Driver");

             //2.创建与数据库的连接
             Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root");

             //3.创建Statement对象，并执行sql语句
             Statement stmt = conn.createStatement();
             String sql = "select * from user";
             stmt.execute(sql);    //获取多个结果
             ResultSet rs =  stmt.getResultSet();

             //4.处理结果集
             while(rs.next()){
                 String uname = rs.getString("uname");
                 int age = rs.getInt("age");
                 System.out.println(uname + ":" + age);
             }

             //5.关闭查询语句和连接
             rs.close();
             stmt.close();
             conn.close();
         }catch(Exception e){
             e.printStackTrace();
         }
     }
 }

主要类 Statement、ResultSet，具体方法参考jdk