12.19

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">
      

      <form action="{{ url_for('search') }}" method="get" class="navbar-form navbar-left">
              <input name="q" type="text" class="form-control" placeholder="请输入关键字">
              <button type="submit" class="btn btn-default"><span class="glyphicon glyphicon-search" aria-hidden="true"></span>查找</button>
          </form>

       

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_

   @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('fabu.html', questions=ques)