学生管理系统 数据库版结果 查询student表中所有学生信息

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"));}}
    
}

结果 

查询student表中所有学生信息

student表中新增三条数据

3.查询student表中电话以182开头的所有学生信息（SQL要用到模糊查询like）

4.修改student表中第5条数据，电话改为“13124235300” 

5.查询student表中所有男性的学生信息 

6.修改student表中第10条数据，姓名改为“大帅哥” 

7.查询student表中电话以139开头的所有学生信息（SQL要用到模糊查询like）

8.删除student表中第3条数据

9.查询student表中所有女性的学生信息

10.查询student表中所有学生信息