3.11学习总结

在第一阶段开发时用到的dao层方法，对sqlite数据库的增删改查

1.注册

  public boolean register(User user){
        SQLiteDatabase sdb=dbHelper.getReadableDatabase();
        String sql="insert into user_login(username,password,age,sex,uid) values(?,?,?,?,?)";
        Object obj[]={user.getUsername(),user.getPassword(),user.getAge(),user.getSex(),user.getUid()};
        sdb.execSQL(sql, obj);
        return true;
    }

2.注册

  public boolean login(String username){
        SQLiteDatabase sdb=dbHelper.getReadableDatabase();
        String sql="select * from user_login where username=?";
        Cursor cursor=sdb.rawQuery(sql, new String[]{username});
        if(cursor.moveToFirst()==true){
            cursor.close();
            return true;
        }
        return false;
    }

3.添加信息

    public boolean insert(Bean bean){//添加用户信息的方法
        SQLiteDatabase db = dbHelper.getReadableDatabase();
        Date date0 = new Date();
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
        String date = simpleDateFormat.format(date0);
        ContentValues values = new ContentValues();
        values.put("username",bean.getUsername());
        values.put("date",date);
        values.put("userid",bean.getUserid());
        values.put("heat",bean.getHeat());
        values.put("place",bean.getPlace());
        values.put("health",bean.getHealth());
        values.put("condition",bean.getCondition());

        long insert = db.insert("infomax",null,values);
        //System.out.println(temBean.getPlace());
        return insert>0;
    }

4.查询信息

 public List<Bean> queryAll(){
        List<Bean> list=new ArrayList<>();
        Bean bean=null;
        SQLiteDatabase db=dbHelper.getReadableDatabase();
        Cursor c=db.query("infomax",null,null,null,null,null,null,null);
        if(c!=null&&c.getCount()>0){
            list=new ArrayList<>();
            while(c.moveToNext()){
                bean=new Bean();
                bean.setUsername(c.getString(c.getColumnIndex("username")));
                bean.setDate(c.getString(c.getColumnIndex("date")));
                bean.setUserid(c.getString(c.getColumnIndex("userid")));
                bean.setPlace(c.getString(c.getColumnIndex("place")));
                bean.setHeat(c.getString(c.getColumnIndex("heat")));
                bean.setCondition(c.getString(c.getColumnIndex("condition")));
                bean.setId(c.getInt(c.getColumnIndex("id")));
                list.add(bean);
            }
        }
        return list;
    }