Java基于JDBC连接数据库及显示数据操作示例

public class stuInfo {
  private int sno;
  private String sname;
  private String sex;
  private int age;
  public int getSno() {
    return sno;
  }
  public void setSno(int sno) {
    this.sno = sno;
  }
  public String getSname() {
    return sname;
  }
  public void setSname(String sname) {
    this.sname = sname;
  }
  public String getSex() {
    return sex;
  }
  public void setSex(String sex) {
    this.sex = sex;
  }
  public int getAge() {
    return age;
  }
  public void setAge(int age) {
    this.age = age;
  }
  public stuInfo(){
  }
  public stuInfo(int sno, String sname, String sex, int age) {
    this.sno = sno;
    this.sname = sname;
    this.sex = sex;
    this.age = age;
  }
}

import info.stuInfo;
import java.util.ArrayList;
import java.sql.*;
public class showTest {
  public static void main(String[] args) {
    ArrayList<stuInfo> list = getAllStus();
    if(list.size() == 0){
      System.out.println("暂无数据");
    }else{
      for(stuInfo s: list){ //遍历集合数据
        System.out.println(s.getSno()+"\t"+s.getSname()+"\t"+s.getSex()+"\t"+s.getAge());
      }
    }
  }
  //采用集合的方法，返回数据集合
  public static ArrayList<stuInfo> getAllStus(){
    ArrayList<stuInfo> stulist = new ArrayList<stuInfo>();
    String url = "com.mysql.jdbc.Driver"; //加载驱动包
    String connectSql = "jdbc:mysql://127.0.0.1:3306/studentdb"; //链接MySQL数据库
    String sqlUser = "root"; //数据库账号
    String sqlPasswd = "*****"; //你的数据库密码
    Connection con = null;
    PreparedStatement psm = null;
    ResultSet rs = null;
    try {
      //加载驱动包
      Class.forName(url);
      //连接MYSQL
      con = DriverManager.getConnection(connectSql,sqlUser,sqlPasswd);
      //执行MYSQL语句
      psm = con.prepareStatement("select * from stable");
      rs = psm.executeQuery();
      System.out.println("编号"+"\t"+"姓名"+"\t"+"性别"+"\t"+"年龄");
      while(rs.next()){
        stuInfo s = new stuInfo();
        s.setSno(rs.getInt(1));
        s.setSname(rs.getString(2));
        s.setSex(rs.getString(3));
        s.setAge(rs.getInt(4));
        stulist.add(s);
      }
      //关闭数据库连接
      rs.close();
      psm.close();
      con.close();
    } catch (Exception e) {
      System.out.println("显示所有数据报错，原因："+e.getMessage());
    }
    return stulist;
  }
}