学生管理系统 数据库版

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