最新消息:VPS服务器又从fzhost.net换回Linode了,主题仍用朋友推荐的大前端D8

[已解决]Flask的sqlalchemy中数据库表的autoincrement字段如何实现自动增加

Flask crifan 1167浏览 0评论

已有Flask的sqlalchemy的数据库的表,

其中有个id的字段是:autoincrement,且是primary_key

class Event(db.Model):
    __tablename__ = “events”
    # Columns
    id = db.Column(db.Integer, primary_key = True, autoincrement = True)
    #user_openid = db.Column(db.String(64))
    #user_openid = db.Column(db.String(64), db.ForeignKey(‘user.openid’))
    user_openid = db.Column(db.String(64), db.ForeignKey(‘wechat_users.openid’))
    title = db.Column(db.String(128))
    start_date = db.Column(db.DateTime)
    end_date = db.Column(db.DateTime)
    location = db.Column(db.String(256))
    cur_user_num = db.Column(db.Integer)
    max_user_num = db.Column(db.Integer)
    is_public = db.Column(db.Boolean)
    description = db.Column(db.Text)
    def __init__(self,
                 id,
                 user_openid,
                 title = “”,
                 location = “”,
                 start_date = None,
                 end_date = None,
                 cur_user_num = 0,
                 max_user_num = 0,
                 is_public = False,
                 description = “”):
        self.id = id
        self.user_openid = user_openid
        self.title = title
        self.location = location
        self.start_date = start_date
        self.end_date = end_date
        self.cur_user_num = cur_user_num
        self.max_user_num = max_user_num
        self.is_public = is_public
        self.description = description

此处的id是自增autoincrement的

但是对于自己的__init__

由于设置了id的初始化

-》导致新生成Event对象是,不传入id,就没法自动创建了。

所以要去搞清楚:

autoincrement如何使用

flask sqlalchemy autoincrement 如何自动增加

python – unable to create autoincrementing primary key with flask-sqlalchemy – Stack Overflow

flask-sqlalchemy使用(基础知识) – 简书

Pyhton日记——Flask写一个简易的知乎日报API – 简书

flask开发restful api系列(3)–利用alembic进行数据库更改 – 月儿弯弯0204 – 博客园

class User(Base):
22     __tablename__ = ‘user’
23
24     id = Column(‘id’, Integer, primary_key=True)
25     phone_number = Column(‘phone_number’, String(11), index=True)
26     password = Column(‘password’, String(30))
27     nickname = Column(‘nickname’, String(30), index=True, nullable=True)
28     head_picture = Column(‘head_picture’, String(100), default=”)
29     register_time = Column(‘register_time’, DateTime, index=True, default=datetime.datetime.now)

好像不用__init__就可以了?

模型声明 — Flask-SQLAlchemy 0.16 documentation

flask sqlalchemy how to use autoincrement

python – SQLAlchemy: How to make an integer column auto_increment (and unique) without making it a primary key? – Stack Overflow

__init__时候不初始化?

然后去用:

requestForm = request.form
app.logger.debug(“requestForm=%s”, requestForm)
title               = requestForm.get(“title”, “”)
start_date          = requestForm.get(“start_date”, “”)
end_date            = requestForm.get(“end_date”, “”)
location            = requestForm.get(“location”, “”)
max_user_num        = requestForm.get(“max_user_num”, “”)
is_public           = requestForm.get(“is_public”, “”)
description         = requestForm.get(“description”, “”)
notification_time   = requestForm.get(“notification_time”, “”)
app.logger.debug(“title=%s, start_date=%s, end_date=%s, location=%s, max_user_num=%s, is_public=%s, description=%s, notification_time=%s”,
                 title, start_date, end_date, location, max_user_num, is_public, description, notification_time)
# 2016/8/26 10:09
start_date = datetime.strptime(start_date, “%Y/%m/%d %H:%M”)
app.logger.debug(“start_date=%s”, start_date)
end_date = datetime.strptime(end_date, “%Y/%m/%d %H:%M”)
app.logger.debug(“end_date=%s”, end_date)
#is_public = (is_public == “on”) ? True : False
is_public = (is_public == “on”)
app.logger.debug(“is_public=%s”, is_public)
newEvent = Event(user_openid = curUserOpenId,
                 title = title,
                 location = location,
                 start_date = start_date,
                 end_date = end_date,
                 cur_user_num = 1,
                 max_user_num = max_user_num,
                 is_public = is_public,
                 description = description)
app.logger.debug(‘newEvent=%s’, newEvent)
db.session.add(newEvent)
db.session.commit()
app.logger.debug(“added new event=%s”, newEvent)
return redirect(url_for(‘index’, curUser = curUser))

即可:

DEBUG in views [/usr/share/nginx/html/SIPEvents/sipevents/views.py:362]:
added new event=<Event id=2 user_openid= title=u’\u89c2\u81f4\u9700\u6c42′>

转载请注明:在路上 » [已解决]Flask的sqlalchemy中数据库表的autoincrement字段如何实现自动增加

发表我的评论
取消评论

表情

Hi,您需要填写昵称和邮箱!

  • 昵称 (必填)
  • 邮箱 (必填)
  • 网址
54 queries in 0.241 seconds, using 12.07MB memory