flask框架实现连接sqlite3数据库的方法分析

import sqlite3 #导入sqlite3包def get_conn(): #定义该函数用来连接数据库 return sqlite3.connect("test.db")class User(object): def __init__(self,id,name):  self.id = id  self.name = name def save(self):  sql = "insert into user VALUES (?,?)"#sql语句  conn = get_conn()#连接数据库  cursor = conn.cursor()#定义一个游标  cursor.execute(sql,(self.id,self.name))#执行sql语句  conn.commit()#提交数据库改动  cursor.close()#关闭游标  conn.close()#关闭数据库连接 ''' staticmethod相当于一个定义在类里面的函数，所以如果一个方法既不跟实例 相关也不跟特定的类相关，推荐将其定义为一个staticmethod，这样不仅使代 码一目了然，而且似的利于维护代码。 ''' @staticmethod def query():  sql = "select * from user"  conn = get_conn()  cursor = conn.cursor()  rows = cursor.execute(sql)  users = []  for row in rows:   user = User(row[0],row[1])   users.append(user)  conn.commit()  cursor.close()  conn.close()  return users def __str__(self):  return 'id:{}--name:{}'.format(self.id,self.name)#注此处的是点不是逗号

from flask_script import Managerfrom learn_flask_script import appimport sqlite3from models import User

@manager.commanddef init_db(): sql = "create table user (id INT,name TEXT)" conn = sqlite3.connect("test.db") cursor = conn.cursor() cursor.execute(sql) conn.commit() cursor.close() conn.close()

@manager.commanddef save(): user = User(1,'csdn') user.save()

@manager.commanddef query_all(): users = User.query() for user in users:  print(user)

from flask_script import Managerfrom learn_flask_script import appimport sqlite3from models import Usermanager = Manager(app)@manager.commanddef init_db(): sql = "create table user (id INT,name TEXT)" conn = sqlite3.connect("test.db") cursor = conn.cursor() cursor.execute(sql) conn.commit() cursor.close() conn.close()@manager.commanddef save(): user = User(1,'zhangjia') user.save()@manager.commanddef query_all(): users = User.query() for user in users:  print(user)if __name__ == "__main__": manager.run()