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城市信息更新

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master
zart2007 2 years ago
parent 2c6c87915e
commit 792c9ec098
4 changed files with 77 additions and 37 deletions
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20
app.py
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@ -9,20 +9,19 @@
''' '''
from flask import Flask, render_template from flask import Flask, render_template
from models import User, City_Info
from database import *
app = Flask(__name__) app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql://root:root@127.0.0.1/example'
@app.route("/") @app.route("/")
def hello(): def hello():
return "<h1>hello</h1>" return "<h1>hello</h1>"
@app.route('/hello/')
@app.route('/hello/<name>/') @app.route('/hello/<name>/')
def hello_2(name): def hello_2(name=None):
return render_template('index.html', name=name) return render_template('index.html', name=name)
@ -37,5 +36,16 @@ def multi():
return render_template('table.html', table=table) return render_template('table.html', table=table)
@app.route("/city_info/")
def city_info():
filter = ["province", "cityname", 'usernumber', '操作']
info = City_Info.query.all()
dic = {"filter":filter, "info":info}
return render_template('city_info.html', dic=dic)
if __name__ == '__main__': if __name__ == '__main__':
init_db() # 初始化数据库
app.run(host="0.0.0.0", port=8080, debug=True) app.run(host="0.0.0.0", port=8080, debug=True)

41
database.py
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@ -8,47 +8,30 @@
2023/4/17 16:01 zart20 1.0 None 2023/4/17 16:01 zart20 1.0 None
''' '''
# from flask import Flask
# from flask_sqlalchemy import SQLAlchemy
#
# app = Flask(__name__)
#
# user = "root"
# password = "123123"
# database = 'example'
# uri = "mysql+pymysql://%s:%s@127.0.0.1:3306/%s" % (user, password, database)
# print(uri)
# app.config['SQLALCHEMY_DATABASE_URI'] = uri
# app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
#
# db = SQLAlchemy(app)
#
# class User(db.Model):
# __tablename__="user"
# id = db.Column(db.Integer, primary_key=True)
# name = db.Column(db.String(255))
# age = db.Column(db.Integer)
from sqlalchemy import create_engine from sqlalchemy import create_engine
from sqlalchemy.orm import scoped_session, sessionmaker from sqlalchemy.orm import scoped_session, sessionmaker
from sqlalchemy.ext.declarative import declarative_base from sqlalchemy.ext.declarative import declarative_base
# create_engine函数用于创建一个数据库引擎 (engine) 对象，该对象用于与底层数据库进行通信。
engine = create_engine('mysql+mysqldb://root:123123@127.0.0.1/example') engine = create_engine('mysql+mysqldb://root:123123@127.0.0.1/example')
# scoped_session 函数用于封装会话工厂，使其能够被多个线程共享。
# 使用 scoped_session 可以保证每个线程都能使用同一个会话对象，从而避免了多个线程之间的会话冲突问题。
db_session = scoped_session( db_session = scoped_session(
# sessionmaker 函数中指定会话的参数，包括禁用自动提交 (autocommit=False) 和自动flush (autoflush=False)。
# 这样可以在需要时手动控制 SQL 的提交和刷新机制。bind 参数指定了这个会话将要连接的数据库引擎对象。
sessionmaker( sessionmaker(
autoflush=False, autoflush=False,
autocommit=False, autocommit=False,
bind=engine bind=engine))
)
)
Base = declarative_base()
Base.query = db_session.query_property()
Base = declarative_base() # `declarative_base` 是在 SQLAlchemy 中用于实现映射类 (ORM 类) 与表的映射关系的基类。
Base.query = db_session.query_property() # 将会话工厂的 query 方法设置成了 Base 的属性 query，这样在定义映射类时可以直接使用 Base.query 来查询数据库。
def init_db(): def init_db():
import models # 创建了所有继承自 Base 的 ORM 类所映射的表，如果表已经存在，则跳过。
# 这个函数将会自动找到所有继承自 Base 的 ORM 类，并生成对应的数据表。
# 其中 bind=engine 表示使用上面定义的数据库引擎来执行 SQL 语句，实现将 ORM 类中的属性映射为数据表中的列及其属性。
Base.metadata.create_all(bind=engine) Base.metadata.create_all(bind=engine)

21
models.py
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@ -8,8 +8,8 @@
2023/4/17 16:43 zart20 1.0 None 2023/4/17 16:43 zart20 1.0 None
''' '''
from sqlalchemy import Column, Integer, String from sqlalchemy import Column, Integer, String, DateTime
from database import Base from database import *
class User(Base): class User(Base):
__tablename__ = "users" __tablename__ = "users"
@ -22,4 +22,21 @@ class User(Base):
self.email = email self.email = email
def __repr__(self): def __repr__(self):
# 有一个内置的函数叫 repr，它能把一个对象用字符串的形式表达出来以便辨认
return f'<User {self.name!r}>' return f'<User {self.name!r}>'
class City_Info(Base):
__tablename__ = "city_info"
id = Column(Integer, primary_key=True)
province = Column(String(120),nullable=False)
cityname = Column(String(120),nullable=False)
usernumber = Column(Integer,default=0)
def __init__(self, province=None, cityname=None, usernumber=None):
self.province = province
self.cityname = cityname
self.usernumber = usernumber
def __repr__(self):
return f"<cityname {self.cityname!r} province {self.province!r}>"

30
templates/city_info.html
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@ -0,0 +1,30 @@
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>城市信息</title>
</head>
<body>
<table border="1" cellpadding="15">
<caption>城市信息</caption>
<tr>
<th>{{ dic.filter.0 }}</th>
<th>{{ dic.filter.1 }}</th>
<th>{{ dic.filter.2 }}</th>
<th>{{ dic.filter.3 }}</th>
</tr>
{% for row in dic.info %}
<tr>
<td>{{ row.province }}</td>
<td>{{ row.cityname }}</td>
<td>{{ row.usernumber }}</td>
<td>{{ "添加 删除" }}</td>
</tr>
{% endfor %}
</table>
</body>
</html>
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