社区版pycharm flask封装接口
因为装的pycharm版本是社区版，没有单独的flask项目创建入口
1、首先和创建python项目一样创建一个项目：要选择虚拟环境（一般默认即可）
2、项目文件夹下安装flask：npm install flask
前端渲染后续研究，此次只封装接口
3 导包
notes：1、调试过程中要手动打开debug模式
2、cors是解决前端跨域问题
import os
import json
os.environ['NLS_LANG'] = 'SIMPLIFIED CHINESE_CHINA.UTF8'
from flask import Flask,jsonify,request
from flask_cors import * #solve cross-domain problems
from flask import render_template
import pymysql
app = Flask(__name__) #must have
#app.config['DEBUG'] = True
CORS(app, supports_credentials=True) #solve cross-domain problems4 连接数据库，对数据库进行增删改
notes：如果请求的参数是一个参数，要注意是不是元组格式，如果是需要在参数后加逗号，因为元组只有一个元素的话 不加逗号 就不是元祖（参考：select2函数）
import os
import json
#from flask_cors import *
os.environ['NLS_LANG'] = 'SIMPLIFIED CHINESE_CHINA.UTF8'
from flask import Flask,jsonify,request
from flask_cors import *
from flask import render_template
import pymysql
app = Flask(__name__)
#app.config['DEBUG'] = True
CORS(app, supports_credentials=True)
class MysqldbHelper(object):
def __init__(self):
try:
self.db = pymysql.connect(
host="127.0.0.1",
user="root",
passwd="123456",
port=55111,
db="test_suit",
charset='utf8')
#self.db = pymysql.connect(self.host, self.user, self.passwd, self.dbase, self.port, charset='utf8')
except pymysql.err:
print('error')
def select1(self, sql):
''' 数据库查询 '''
self.cursor = self.db.cursor()
try:
self.cursor.execute(sql) # 返回 查询数据 条数 可以根据 返回值 判定处理结果
data = self.cursor.fetchall() # 返回所有记录列表
return data
except:
print('Error: unable to fecth data')
finally:
self.cursor.close()
self.db.close()
# return {c.name: getattr(self, c.name) for c in self.__table__.columns}
# 上面的有缺陷，表字段和属性不一致会有问题
def select2(self, sql,args):
''' 数据库查询 '''
self.cursor = self.db.cursor()
try:
self.cursor.execute(sql,(args,)) # 返回 查询数据 条数 可以根据 返回值 判定处理结果
data = self.cursor.fetchall() # 返回所有记录列表
return data
except:
print('Error: unable to fecth data')
finally:
self.cursor.close()
self.db.close()
def insert(self,sql,args):
self.cursor = self.db.cursor()
try:
# 执行sql
#data = (Tsuitname, Tname, Tdescriber, Tstate, Tresult, Tresultdes)
# self.cursor.execute(sql,(args['Tsuitname'],args['Tname'],args['Tdescriber'],args['Tstate'],args['Tresult'],args['Tresultdes'],)) 字典的方式
self.cursor.execute(sql,args)
# tt = self.cursor.execute(sql) # 返回 插入数据 条数 可以根据 返回值 判定处理结果
# print(tt)
self.db.commit()
return True
except:
# 发生错误时回滚
self.db.rollback()
return False
finally:
self.cursor.close()
self.db.close()
def delete(self,sql,args):
''' 操作数据库数据删除 '''
self.cursor = self.db.cursor()
try:
# 执行sql
self.cursor.execute(sql,(args,))
# tt = self.cursor.execute(sql) # 返回 删除数据 条数 可以根据 返回值 判定处理结果
# print(tt)
self.db.commit()
except:
# 发生错误时回滚
self.db.rollback()
finally:
self.cursor.close()
self.db.close()
def update(self,sql,args):
self.cursor = self.db.cursor()
try:
self.cursor.execute(sql,args)
self.db.commit()
return True
except:
self.db.rollback()
finally:
self.cursor.close()
self.db.close()
5、设置接口路由 及传参/返回值等
@app.route('/update', methods=[ 'POST']) 路由设置，格式为：http：//localhost/updatemethods=[ 'POST'] 请求方法 get/post
获取json格式数据：request.json.get（）可用postman调试，调试时把debug模式打开
前端渲染时：因为后端写的是json格式，前端请求时需将参数转化为json：
例如：service.post('http://localhost/insert', JSON.stringify(参数), { headers: { 'Content-Type': 'application/json; charset=UTF-8' } });
以下代码的不足：接口不够规范，请求参数/返回数据 没有放到一个有名称的元组里
@app.route('/select2', methods=[ 'POST','GET'])
def sel2():
db = MysqldbHelper()
try: #z这样判断不对，需要更改
sql = 'select * from test_suit.suit'
fc = db.select1(sql)
return json.dumps(fc, ensure_ascii=False, indent=4)
except:
return ()
@app.route('/select', methods=[ 'POST','GET'])
def sel():
db = MysqldbHelper()
idSuit = request.json.get('idSuit',None)
Tsuitname = request.json.get('Tsuitname', None)
'''
Tname = request.json.get('Tname', None)
Tstate = request.json.get('Tstate', None)
Tresult = request.json.get('Tresult', None)
'''
try: #z这样判断不对，需要更改
if idSuit != None:
sql = 'select * from test_suit.suit where idSuit=%s '
fc = db.select2(sql, idSuit)
if Tsuitname != None:
sql= 'select * from test_suit.suit where Tsuitname=%s'
fc = db.select2(sql, Tsuitname)
return json.dumps(fc, ensure_ascii=False, indent=4)
except:
return ()
@app.route('/delete', methods=[ 'POST'])
def dels():
db = MysqldbHelper()
idSuit= request.json.get('idSuit')
sql= 'delete from test_suit.suit where idSuit=%s'
db.delete(sql,idSuit)
return jsonify({"code": 200})
@app.route('/insert', methods=[ 'POST'])
def index():
if request.method == 'POST':
db = MysqldbHelper()
Tsuitname = request.json.get('Tsuitname',None)
#Tname = request.json['Tname']
Tname = request.json.get('Tname', None)
Tdescriber =request.json.get('Tdescriber',None)
Tstate = request.json.get('Tstate',None)
Tresult = request.json.get('Tresult',None)
Tresultdes = request.json.get('Tresultdes',None)
data=(Tname,Tdescriber,Tstate,Tresult,Tresultdes)
#if (len(Tsuitname) != 0) & (len(Tname)!=0 ):
sql_insert = 'insert into test_suit.suit value(default,%s,%s,%s,%s,%s,%s)'
if db.insert(sql_insert,data):
return jsonify({"code": 200, "mesg": "insert"})
@app.route('/update', methods=[ 'POST'])
def update():
if request.method == 'POST':
db = MysqldbHelper()
idSuit = request.json.get('idSuit')
Tsuitname = request.json.get('Tsuitname', None)
Tsuitname = request.json.get('Tsuitname',None)
#Tname = request.json['Tname']
Tname = request.json.get('Tname', None)
Tdescriber =request.json.get('Tdescriber',None)
Tstate = request.json.get('Tstate',None)
Tresult = request.json.get('Tresult',None)
Tresultdes = request.json.get('Tresultdes',None)
data=(Tsuitname,Tname,Tdescriber,Tstate,Tresult,Tresultdes,idSuit)
#if (len(Tsuitname) != 0) & (len(Tname)!=0 ):
sql_insert = 'update test_suit.suit set Tsuitname=%s,Tname=%s,Tdescriber=%s,Tstate=%s,Tresult=%s,Tresultdes=%s where idSuit=%s'
if db.update(sql_insert,data):
return jsonify({"code": 200, "mesg": "update"})
else:
return jsonify({"code": 500, "mesg": "update"})
@app.route('/hello')
def hello_world():
name = request.args.get('name','')
return 'Hello ' + name + '!'
if __name__=="__main__":
#app.run(host='127.0.0.1', port='5678')
app.run()