Java基础总结数据库编程

Posted 2020-09-30 水杉

mysql数据库查询

 1 import java.sql.*;
 2 public class JdbcDemo1{
 3     public static void main(String[] args){
 4         try{
 5             //1.加载数据库驱动程序
 6             Class.forName("org.gjt.mm.mysql.Driver");
 7             
 8             //2.创建与数据库的连接
 9             Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root");
10             
11             //3.创建Statement对象，并执行sql语句
12             Statement stmt = conn.createStatement();
13             String sql = "select * from user";
14             stmt.execute(sql);    //获取多个结果
15             ResultSet rs =  stmt.getResultSet();
16             
17             //4.处理结果集
18             while(rs.next()){
19                 String uname = rs.getString("uname");
20                 int age = rs.getInt("age");
21                 System.out.println(uname + ":" + age);
22             }
23             
24             //5.关闭查询语句和连接
25             rs.close();
26             stmt.close();
27             conn.close();
28         }catch(Exception e){
29             e.printStackTrace();
30         }
31     }
32 }

主要类 Statement、ResultSet，具体方法参考jdk