第一次个人作业（安卓学习记录系统）03

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1.新学期目标2024-03-052.打卡2024-05-293.打卡22024-05-294.打卡32024-05-295.打卡 42024-05-296.打卡52024-06-137.打卡62024-06-138.打卡72024-06-169.打卡82024-06-1610.打卡92024-06-1611.打卡102024-06-1612.结对作业（地铁查询项目）012024-06-1613.结对作业（地铁项目）022024-06-1614.结对作业（地铁项目）032024-06-1615.结对作业（地铁项目）042024-06-1616.结对作业（地铁项目）052024-06-1617.结对作业（地铁项目）062024-06-1618.结对作业（地铁项目）072024-06-1619.结对作业（地铁项目）082024-06-1620.结对作业（地铁项目）092024-06-1621.结对作业（地铁项目）102024-06-1622.结对作业（地铁项目）112024-06-1623.结对作业（地铁项目）122024-06-1624.结对作业（地铁项目）132024-06-1625.结对作业（地铁项目）142024-06-1626.五一冲刺（政策查询系统）12024-06-1627.五一冲刺（政策查询系统）22024-06-1628.政策查询系统（安卓）12024-06-1629.政策查询系统（安卓）22024-06-1630.政策查询系统（安卓）32024-06-1631.政策查询系统（安卓）42024-06-1632.政策查询系统（安卓）52024-06-1633.政策查询系统（安卓）62024-06-1634.政策查询系统（安卓）72024-06-1635.JS开发2024-02-2836.安卓app开发相关2024-02-2837.第一次个人作业（安卓学习记录系统）012024-06-1638.第一次个人作业（安卓学习记录系统）022024-06-16

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40.第一次个人作业（安卓学习记录系统）042024-06-1641.第一次个人作业（安卓学习记录系统）052024-06-1642.第一次个人作业（安卓学习记录系统）062024-06-1643.第一次个人作业（安卓学习记录系统）072024-06-1644.打卡112024-06-1945.打卡122024-06-1946.打卡132024-06-1947.打卡142024-06-1948.打卡152024-06-1949.打卡162024-06-1950.打卡172024-06-1951.打卡182024-06-1952.打卡192024-06-1953.打卡202024-06-1954.python学习2024-06-1955.python学习22024-06-1956.python学习32024-06-1957.Javaweb2024-06-1958.打卡212024-06-1959.fragment学习和使用2024-06-1960.mybits学习12024-06-1961.mybits学习22024-06-1962.mybits学习32024-06-1963.课程总结2024-06-1964.个人总结2024-06-19

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具体数据库操作

RecordDao.java

package com.example.app_02.utils;

import com.example.app_02.R;
import com.example.app_02.database.MySQLConnection;
import com.example.app_02.entity.Record;
import com.example.app_02.entity.User;

import java.util.ArrayList;

public class RecordDao extends MySQLConnection {
    public int insertRecord(Record record) {
        int value = 0;
        connect();
        try {
            String sql = "insert into record(starttime, endtime, record) values(?,?,?)";
            preparedStatement = connection.prepareStatement(sql);
            //将数据插入数据库中
            preparedStatement.setString(1, record.getStartTime());
            preparedStatement.setString(2, record.getEndTime());
            preparedStatement.setString(3, record.getRecord());
            value = preparedStatement.executeUpdate();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            close();
        }
        return value;
    }

    public ArrayList<Record> findRecord() {
        connect();
        ArrayList<Record> arrayList = new ArrayList<>();
        try {
            //sql语句。我这里是根据我自己的users表的username字段来查询记录
            String sql = "select * from record where 1=1";
            //获取用于向数据库发送sql语句的preparedStatement
            preparedStatement = connection.prepareStatement(sql);
            //根据账号进行查询
            //执行sql查询语句并返回结果集
            resultSet = preparedStatement.executeQuery();
            while (resultSet.next()) {
                //.next()表示指针先下一行，若有数据则返回true
                Record record = new Record(resultSet.getString("starttime"), resultSet.getString("endtime"), resultSet.getString("record"));
                arrayList.add(record);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            close();
        }
        return arrayList;//若传入成功返回账号，失败则为null
    }
}

UserDao.java

package com.example.app_02.utils;

import com.example.app_02.database.MySQLConnection;
import com.example.app_02.entity.User;
import com.example.app_02.entity.UserInfo;

public class UserDao extends MySQLConnection {
    public User findUserName(String username) {
        connect();
        User user = null;
        try {
            //sql语句。我这里是根据我自己的users表的username字段来查询记录
            String sql = "select * from user where username=?";
            //获取用于向数据库发送sql语句的preparedStatement
            preparedStatement = connection.prepareStatement(sql);
            //根据账号进行查询
            preparedStatement.setString(1, username);
            //执行sql查询语句并返回结果集
            resultSet = preparedStatement.executeQuery();
            while (resultSet.next()) {
                //.next()表示指针先下一行，若有数据则返回true
                user = new User();
                user.setUsername(resultSet.getString("username"));
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            close();
        }
        return user;//若传入成功返回账号，失败则为null
    }

    public User findUser(String username, String password) {
        connect();
        User user = null;
        try {
            //sql语句。我这里是根据我自己的users表的username和password字段来查询记录
            String sql = "select * from user where username=? and password=?";
            //获取用于向数据库发送sql语句的preparedStatement
            preparedStatement = connection.prepareStatement(sql);
            //根据账号和密码进行查询
            preparedStatement.setString(1, username);
            preparedStatement.setString(2, password);
            resultSet = preparedStatement.executeQuery();
            while (resultSet.next()) {
                user = new User();
                user.setUsername(resultSet.getString("username"));
                user.setPassword(resultSet.getString("password"));
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            close();
        }
        return user;//若传入成功返回账号和密码，失败则为null
    }


    public int registerUser(User user) {
        int value = 0;
        connect();
        try {
            String sql = "insert into user(username,password) values(?,?)";
            preparedStatement = connection.prepareStatement(sql);
            //将数据插入数据库中
            preparedStatement.setString(1, user.getUsername());
            preparedStatement.setString(2, user.getPassword());
            value = preparedStatement.executeUpdate();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            close();
        }
        return value;
    }

    public int updateUserStudentid(UserInfo userInfo, String username){
        int value = 0;
        connect();
        try {
            String sql = "update user set studentid=? where username=?";
            preparedStatement = connection.prepareStatement(sql);
            //将数据插入数据库中
            preparedStatement.setString(1, userInfo.getStudentid());
            preparedStatement.setString(2, username);
            value = preparedStatement.executeUpdate();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            close();
        }
        return value;
    }
}
UserInfoDao.java

package com.example.app_02.utils;

import com.example.app_02.database.MySQLConnection;
import com.example.app_02.entity.User;
import com.example.app_02.entity.UserInfo;

public class UserInfoDao extends MySQLConnection {
    public int insertUserInfo(UserInfo userInfo) {
        int value = 0;
        connect();
        try {
            String sql = "insert into userinfo(studentid, name, phonenumber, class) values(?,?,?,?)";
            preparedStatement = connection.prepareStatement(sql);
            //将数据插入数据库中
            preparedStatement.setString(1, userInfo.getStudentid());
            preparedStatement.setString(2, userInfo.getName());
            preparedStatement.setString(3, userInfo.getPhonenumber());
            preparedStatement.setString(4, userInfo.getClassname());
            value = preparedStatement.executeUpdate();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            close();
        }
        return value;
    }
}