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 Manager
from learn_flask_script import app
import sqlite3
from models import User

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

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

from flask_script import Manager
from learn_flask_script import app
import sqlite3
from models import User
manager = Manager(app)
@manager.command
def 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.command
def save():
 user = User(1,'zhangjia')
 user.save()
@manager.command
def query_all():
 users = User.query()
 for user in users:
  print(user)
if __name__ == "__main__":
 manager.run()