【Java基础总结】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