实现搜索功能

1. 准备视图函数search()
   
   
2. 修改base.html 中搜索输入框所在的
   1. <form action="{{ url_for('search') }}" method="get">
   2.    <input name="q" type="text" placeholder="请输入关键字">
      

       <div class="daohang_box"><form action="{{ url_for('search')}}" method="get" >
              <a class="shouye" href="{{ url_for('index') }}">首页</a>
          <input id="search_box" name='q'type="text" placeholder="请输入关键词查找">
              <button id="search" type="submit">搜索</button>
              <a class="xiaoqu3" href="{{ url_for('question') }}">发布问答</a>
              <img id="on_off" onclick="mySwitch()" src="{{ url_for('static',filename='images/bulbon.png') }}" >
              {%  if Username %}
      {#            <a class="xiaoqu1" href="{{ url_for('usercenter',user_id=session.get('id')}}">欢迎您{{session.get('Username'}}</a>#导航条的用户#}
      {#            <a class="xiaoqu1" href="{{ url_for('usercenter',user_id=session.get('id') ,tag=1)}}">欢迎您{{session.get('Username')}}</a>#导航条的用户#}
                   <a class="xiaoqu1" href="#">欢迎您{{Username}}</a>
      
                  <a class="xiaoqu2" href="{{ url_for('logout') }}">注销</a>
              {% else %}
                  <a class="xiaoqu1" href="{{ url_for('login') }}">登录</a>
                  <a class="xiaoqu2" href="{{ url_for('register') }}">注册</a></form>
              {%  endif %}
          </div>
      
      

       

3. 完成视图函数search()
   1. 获取搜索关键字
      q = request.args.get('q’)
   2. 条件查询
      qu = Question.query.filter(Question.title.contains(q)).order_by('-creat_time’)
   3. 加载查询结果：
      return render_template('index.html', question=qu）
      
      
4. 组合条件查询
   from sqlalchemy import or_, and_ 

示例：

Lobby.query.filter(
    or_(
        and_(
            Lobby.id == Team.lobby_id,
            LobbyPlayer.team_id == Team.id,
            LobbyPlayer.player_id == player.steamid
        ),
         and_(
            Lobby.id == spectator_table.c.lobby_id,
            spectator_table.c.player_id == player.steamid
        )
    )
)

https://stackoverflow.com/questions/13370993/sqlalchemy-query-and-or-issue

@app.route('/search/')
def search():
    qu=request.args.get('q')
    ques=Question.query.filter(
        or_(
            Question.title.contains(qu),
            Question.detail.contains(qu)
        )
    ).order_by('-creat_time')
    return render_template('index.html',question=ques)