fastapi安裝及訪問頁面

環境

python3.8

pip3 install fastapi

pip3 install uvicorn

pip3 install -i 更換阿里源

安裝python3.8後使用pip命令安裝 fastapi 第三方模組以及 uvicorn 模組

匯入 fastapi

from fastapi import fastapi

)"/"
)async
defroot()
:return

訪問：loaclhost:8000

頁面展示hello world資訊

web訪問完成

安裝 sqlalchemy 模組

建造user的對映

from sqlalchemy.ext.declarative import declarative_base

base = declarative_base(
)class
user
(base)
:#構造對映字段
__tablename__ =
'tbluser'
#對應mysql的tbluser表
userid = column(integer,primary_key=
true
)#表中字段userid
username = column(string(
255)
)#表中username欄位
def__init__
(self,userid,username)
:#建構函式
self.userid = userid
self.username = username
def__str__
(self)
:#列印形式
return
"id：%s,名稱：%s"%(
str(self.userid)
,self.username)

安裝pymysql

pip install pymysql

from sqlalchemy import column, string, create_engine, integer

engine =create_engine(
"mysql+pymysql://root:123456@localhost:3306/fastapi"
,encoding=
'utf-8'
)# 把當前的引擎繫結給這個會話
session = sessionmaker(bind=engine)
# 例項化
session = session(
)

#查詢

"/user/"
)async
defqueryuserbyuserid
(user_id)
:# 建立query查詢，filter是where條件，呼叫one返回唯一行，呼叫all則是返回所有行
try:
user1 = session.query(user)
.filter
(user.userid==user_id)
.one(
)if user1 ==
none
:return
"查詢無結果"
# user2 = session.query(user).filter(user.userid == '2').one()
# vars1 = 
# userlist = session.query(user).all()
# for user in userlist:
# print(user)
# user = engine.connect().execute("select * from tbluser where userid = 1;")
# user = session.execute("select * from user where id = 1;")
session.close(
)except arithmeticerror:
print
("error: 查詢失敗"
)return user1

class

creatuser
(basemodel)
: userid :
int username :
strdef
__str__
(self)
:return
"id：%s,名稱：%s"%(
str(self.userid)
,self.username)
# 增加乙個
"/user/adduser"
)async
definseruser
(user: creatuser)
:try
: datauser = user(userid=user.userid,username=user.username)
#將creatuser接收到的值寵幸賦值給user
session.add(datauser)
session.commit(
)#每次新增都要commit提交
session.close(
)#關閉
except arithmeticerror:
print
("error: 新增失敗"
)return
"新增成功"

from typing import list  #匯入typing模組 的list

# 增加多個
"/user/adduserlist"
)async
defadduserlist(*
,user: list[creatuser]):
# 接受list列表 前提需要匯入list
try:
for u in user:
datauser = user(userid=u.userid, username=u.username)
session.add(datauser)
#我覺得這裡這樣處理應該太消耗資源了,等待更新
session.commit(
) session.close(
)except arithmeticerror:
print
("error: 新增失敗"
)return
"新增成功"

#修改

"/user/updateuser"
)async
defupdateuser
(user_id:
int,updateuser:schema.creatuser)
:try
: queryuser = session.query(models.user)
.filter
(models.user.userid==user_id)
.one(
) update_dict = updateuser.
dict
(exclude_unset=
true
)#變成字典,修改所有
for k, v in update_dict.items():
setattr
(queryuser, k, v)
session.commit(
) session.refresh(queryuser)
session.close(
)except arithmeticerror:
print
("error: 修改失敗"
)return queryuser

#刪除

"/user/deleteuser"
)async
defdeleteuser
(user_id,deleteuser: schema.creatuser)
: queryuser = session.query(models.user)
.filter
(models.user.userid == user_id)
.one(
)setattr
(queryuser,
"isdelete",0
)#修改isdelete的值為0
session.commit(
) session.close(
)return

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