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">
      
      
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

主py文件：

@app.route(‘/cx/‘)
def cx():
    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(‘sy.html‘,questions = ques)

导航html:

 <form action="{{ url_for(‘cx‘) }}" method="get" class="navbar-form navbar-left" role="search">
                <div class="form-group">
                    <input type="text" class="form-control" placeholder="?输入您感兴趣的" name="q">
                </div>
                <button type="submit" class="btn btn-default">查找</button>
             </form>