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

from flask import Flask,render_template,request,redirect,url_for,session
from flask_sqlalchemy import SQLAlchemy
import config
from functools import wraps
from datetime import datetime
from sqlalchemy import or_, and_

app = Flask(__name__)
app.config.from_object(config)
db=SQLAlchemy(app)

class User(db.Model):
    __table__name = 'user'
    id = db.Column(db.Integer,primary_key=True,autoincrement=True)
    username = db.Column(db.String(20),nullable=False)
    password = db.Column(db.String(20),nullable=False)
    nickname = db.Column(db.String(50))

class Question(db.Model):
    __tablename__ = 'question'
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    title = db.Column(db.String(100), nullable=False)
    detail = db.Column(db.Text, nullable=False)
    creat_time = db.Column(db.DateTime, default=datetime.now)
    author_id = db.Column(db.Integer, db.ForeignKey('user.id'))
    author = db.relationship('User', backref=db.backref('question'))

class Comment(db.Model):
    __tablename__='comment'
    id=db.Column(db.Integer, primary_key=True, autoincrement=True)
    author_id = db.Column(db.Integer,db.ForeignKey('user.id'))
    question_id = db.Column(db.Integer,db.ForeignKey('question.id'))
    creat_time = db.Column(db.DateTime, default=datetime.now)
    detail=db.Column(db.Text,nullable=False)
    question=db.relationship('Question',backref=db.backref('comments',order_by=creat_time.deac))
    author=db.relationship('User',backref=db.backref('comments'))

#db.create_all()
@app.route('/')
def base():
    return render_template('base.html')

@app.route('/index/')
def index():
    context = {
            'question':Question.query.all()
        }
    return render_template('index.html',**context)

@app.route('/detail/<question_id>')
def detail(question_id):
    quest = Question.query.filter(Question.id == question_id).first()
    return render_template('detail.html',ques = quest)

@app.route('/comment/',methods=['POST'])
def comment():
     comment = request.form.get('new_comment')
     ques_id = request.form.get('question_id')
     auth_id = User.query.filter(User.username == session.get('user')).first().id
     comm = Comment(author_id=auth_id,question_id=ques_id,detail=comment)
     db.session.add(comm)
     db.session.commit()
     return redirect(url_for('detail',question_id=ques_id))

@app.route('/usercenter/<user_id>/<tag>')

def usercenter(user_id,tag):
    user = User.query.filter(User.id == user_id).first()
    context = {
        'user':user
    }
    if tag == '1':
         return  render_template('user1.html',**context)
    elif tag == '2':
         return  render_template('user2.html',**context)
    else:
         return  render_template('user3.html',**context)

@app.route('/regist/',methods=['GET','POST'])
def regist():
    if request.method=='GET':
        return render_template('regist.html')
    else:
        username=request.form.get('username')
        password=request.form.get('password')
        nickname=request.form.get('nickname')
        user=User.query.filter(User.username==username).first()
        if user:
            return u'username existed'
        else:
            user=User (username=username,password=password,nickname=nickname)
            db.session.add(user)
            db.session.commit()
            return redirect(url_for('login'))



@app.route('/login/',methods=['GET','POST'])
def login():
    if request.method=='GET':
        return render_template('login.html')
    else:
        username=request.form.get('username')
        password=request.form.get('password')
        user = User.query.filter(User.username == username,User.password==password).first()
        if user:
            session['user']=username
            session['userid'] = user.id
            session.permanent = True
            return redirect(url_for('index'))
        else:
            return u'error username or password'



@app.route('/logout/')
def logout():
    session.clear()
    return redirect(url_for('index'))


def loginFirst(func):#定义需要登录装饰器
    @wraps(func)
    def wrapper(*args, ** kwargs):
        if session.get('user'):
            return func(*args, ** kwargs)
        else:
            return redirect(url_for('login'))
    return  wrapper


@app.route('/question/',methods=['GET','POST'])
@loginFirst #需要登录装饰器
def question():
    if request.method=='GET':
        return render_template('question.html')
    else:
        title = request.form.get('title')
        detail = request.form.get('detail')
        author_id = User.query.filter(User.username == session.get('user')).first().id
        question = Question(title=title, detail=detail, author_id=author_id)
        db.session.add(question)
        db.session.commit()
        return redirect(url_for('index'))

@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('-create_time')
    return render_template('index.html',questions=ques)


@app.context_processor
def mycontext():
    usern=session.get('user')
    if usern:
        return{'username':usern}
    else:
        return{}


if __name__ == '__main__':
    app.run(debug=True)

 <form action="{{url_for('search')}}" method="get" class="navbar-form navbar-left">
        <div >
            <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>
        </div>
        </form>

 

转载于:https://www.cnblogs.com/acef/p/8075020.html