Visual Studio 2013进行Python开发（二）---python连接sql server数据库

1.首先需要安装以下三个包：

sqlalchemy

flask-sqlalchemy

pydoc

安装方法如下：

选择env右键选择“Install Python Package...”

弹出如下界面，然后输入包名点击确定即可

 

2.在项目中添加一个“db_mg.py”的文件，代码如下：

#db_mg.py
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from FlaskWebProject3.models import Base
 
class DatabaseManagement():
    def __init__(self):
        self.engine = create_engine("mssql+pymssql://sa:123456@127.0.0.1/UserRights?charset=utf8",echo=True,encoding='utf-8',convert_unicode=True)

        DBsession = sessionmaker(bind=self.engine)    #创建DBsession类
        self.session = DBsession()    #创建对象
 
    def add_obj(self,obj):    #添加内容
        self.session.add(obj)
        self.session.commit()    #提交
        return obj
    def queryall(self,target_class):    #查询内容
        result_list = self.session.query(target_class).all()
        return result_list
    def query_all(self,target_class,query_filter):    #查询内容
        result_list = self.session.query(target_class).filter(query_filter).all()
        return result_list
 
    def update_by_filter(self, obj, update_hash,query_filter):     #更新内容
        self.session.query(obj.__class__).filter(query_filter).update(update_hash)
        self.session.commit()
 
    def delete_by_filter(self, obj, query_filter):     #删除内容
        self.session.query(obj).filter(query_filter).delete()
 
    def close(self):    #关闭session
        self.session.close()
 
    def execute_sql(self, sql_str):    #执行sql语句
        return self.session.execute(sql_str)

其中

create_engine("mssql+pymssql://sa:123456@127.0.0.1/User?charset=utf8",echo=True,encoding='utf-8',convert_unicode=True)中的"sa"为账户登录名，"123456" 为数据库登陆名，"127.0.0.1"为登陆的数据库的服务器名，"User"为数据库名，

如果不添加如下“charset=utf8”，有可能从数据库中查询出来的中文为乱码

 3.具体的调用如下：

views.py

"""
Routes and views for the flask application.
"""

from datetime import datetime
from flask import render_template, session
#from FlaskWebProject3 import app
from flask import Flask,request 
from flask.json import jsonify
import os
from flask.helpers import make_response

from flask_bootstrap import Bootstrap

from wtforms import StringField, SubmitField
from wtforms.validators import Required
from flask_wtf.form import Form
from sqlalchemy.sql.schema import Column
from sqlalchemy.ext.declarative.api import declarative_base
from click import INT
from lib2to3.fixer_util import String
from FlaskWebProject3 import app, models
from flask_sqlalchemy import SQLAlchemy
from FlaskWebProject3.models import Person, User, engine
from FlaskWebProject3.db_mg import DatabaseManagement
from sqlalchemy.orm.session import sessionmaker
from sqlalchemy.engine import create_engine
from _operator import and_

#from FlaskWebProject3.Person import Person




#app.config['SESSION_TYPE'] = 'filesystem'
#app.config['SECRET_KEY'] = os.urandom(24)
#app.config['SQLALCHEMY_DATABASE_URI'] = 'mssql+pymssql://sa:123456@127.0.0.1/UserRights?charset=utf8'
#app.config['SQLALCHEMY_COMMIT_ON_TEARDOWN'] = True
##app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
#app.config['SQLALCHEMY_NATIVE_UNICODE']=True;
#app.config['SQLALCHEMY_TRACK_MODIFICATIONS']=True
#app.config['SQLALCHEMY_ECHO']=True
app.config['JSON_AS_ASCII']=False


@app.route('/111', methods=['GET'])
def GetUser():

 db_session=DatabaseManagement()
 query_filter=and_(Person.Name=="james",Person.Password=="123456");
 person_list = db_session.queryall(Person)
 output = {} 
 for item in person_list:
    output["Name"] = item.Name  
    output["Password"] = item.Password
    
 return jsonify({'message': output})   


if __name__ == '__main__':
 

 app.run(self)
   

注意：

app.config['JSON_AS_ASCII']=False是设置返回的json对象中中文是否乱码，如果不设置则json中返回的中文为乱码