学生管理系统数据库版结果查询student表中所有学生信息

news2024/10/1 1:24:19

1.创建school_java数据库

CREATE DATABASE schooljava;
USE schooljava;
CREATE TABLE student (
id INT(11),
name VARCHAR(25),
tel INT(11),
sex VARCHAR(6)
);
DESC student;

java代码

package Mysql;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import com.mysql.cj.jdbc.Driver;

public class schooljava {
   Connection connection;

   public static void main(String[] args) throws SQLException {
       schooljava schooljava=new schooljava();
       schooljava.getConnection();
       schooljava.selectAll();
       schooljava.add(11,"一号",1824567890,"男");
       schooljava.add(12,"二号",1394567890,"女");
       schooljava.add(13,"三号",1893154635,"男");
       schooljava.select182();
       schooljava.xiugai();
       schooljava.chanan();
       schooljava.dsg();
       schooljava.select139();
       schooljava.sc();
       schooljava.chanv();
       schooljava.selectAll();
   }
   public void add(int id, String name,int tel,String sex) throws SQLException {
       PreparedStatement preparedStatement=connection.prepareStatement("insert into student values(?,?,?,?);");
       preparedStatement.setInt(1, id);
       preparedStatement.setString(2, name);
       preparedStatement.setInt(3,tel);
       preparedStatement.setString(4,sex);
       preparedStatement.executeUpdate();
   }
   public void getConnection()throws SQLException {
       DriverManager.registerDriver(new Driver());//第一步：注册驱动
       connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/school","root","1234");//第二步：获取连接
}

   public void selectAll() throws SQLException {       //查询课程表所有数据
       PreparedStatement preparedStatement=connection.prepareStatement("select*from student");//第三步：获取statement对象
       ResultSet resultSet=preparedStatement.executeQuery();//第四步：执行SQL语句返回结果集
       while(resultSet.next()){
           System.out.print(resultSet.getInt("id"));
           System.out.print(resultSet.getString("name"));
           System.out.print(resultSet.getInt("tel"));
           System.out.println(resultSet.getString("sex"));//第五步：遍历结果集

       }resultSet.close();
       preparedStatement.close();}
   public void select182() throws SQLException {
       PreparedStatement preparedStatement=connection.prepareStatement("select*from student where tel like '182%'");
       ResultSet resultSet=preparedStatement.executeQuery();
       while(resultSet.next()){
           System.out.print(resultSet.getInt("id"));
           System.out.print(resultSet.getString("name"));
           System.out.print(resultSet.getInt("tel"));
           System.out.println(resultSet.getString("sex"));}

}

   public void xiugai() throws SQLException {
       PreparedStatement preparedStatement=connection.prepareStatement("update student set tel=1312423530 where id=5");
       preparedStatement.executeUpdate( );

   }
   public void chanan() throws SQLException {
       PreparedStatement preparedStatement=connection.prepareStatement("select*from student where sex='男'");
       ResultSet resultSet=preparedStatement.executeQuery();
       while(resultSet.next()){
           System.out.print(resultSet.getInt("id"));
           System.out.print(resultSet.getString("name"));
           System.out.print(resultSet.getInt("tel"));
           System.out.println(resultSet.getString("sex"));}
   }
   public void dsg() throws SQLException {
       PreparedStatement preparedStatement=connection.prepareStatement("update student set name='大帅哥' where id=10");
       preparedStatement.executeUpdate( );

   }
   public void select139() throws SQLException {
       PreparedStatement preparedStatement=connection.prepareStatement("select*from student where tel like '139%'");
       ResultSet resultSet=preparedStatement.executeQuery();
       while(resultSet.next()){
           System.out.print(resultSet.getInt("id"));
           System.out.print(resultSet.getString("name"));
           System.out.print(resultSet.getInt("tel"));
           System.out.println(resultSet.getString("sex"));}
       }
   public void sc() throws SQLException {
       PreparedStatement preparedStatement=connection.prepareStatement("delete from student where id=3");
       preparedStatement.executeUpdate( );

   }
   public void chanv() throws SQLException {
       PreparedStatement preparedStatement=connection.prepareStatement("select*from student where sex='女'");
       ResultSet resultSet=preparedStatement.executeQuery();
       while(resultSet.next()){
           System.out.print(resultSet.getInt("id"));
           System.out.print(resultSet.getString("name"));
           System.out.print(resultSet.getInt("tel"));
           System.out.println(resultSet.getString("sex"));}}

}