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flask框架配置mysql數(shù)據(jù)庫操作詳解

更新時間：2019年11月29日 11:37:31 作者：LuckyQueen0928

這篇文章主要介紹了flask框架配置mysql數(shù)據(jù)庫操作,結(jié)合實例形式詳細分析了flask框架配置mysql數(shù)據(jù)庫及連接訪問等相關(guān)操作技巧,需要的朋友可以參考下

本文實例講述了flask框架配置mysql數(shù)據(jù)庫操作。分享給大家供大家參考，具體如下：

該篇博客配置環(huán)境為:python版本3.5，flask2.0，python3中已經(jīng)不再支持MySQLdb模塊，所有這里我用了pymysql，所有使用前應(yīng)該

安裝pymysql:

pip install pymysql

在網(wǎng)上的好多資料都給的是使用sqlite的例子，由于很不喜歡所以今天分享一下flask-sqlalchemy操作mysql的方法.

以前習(xí)慣使用sqlalchemy,后來發(fā)現(xiàn)使用flask-sqlchemy還是要簡單一些（起碼省去了好多模塊和類的導(dǎo)入，create_engine,sessionmaker,declarative。。。）不過flask官方的例子用的是sqlchemy，去官網(wǎng), flask-sqlalchemy官方文檔

這里寫一個簡單的flask web程序，來說明flask-sqlalchemy如何驅(qū)動msyql數(shù)據(jù)庫.為了偷懶，這個例子以上一篇博文flask藍圖的使用為基礎(chǔ).

首先看一下程序結(jié)構(gòu):

相比上一節(jié)只多了兩個文件，create_db.py,models.py

1.建立mysql和app的連接

在config.py中加入以下兩項配置:

SQLALCHEMY_DATABASE_URI = 'mysql+pymysql://root:xxxxx@localhost:3306/test?charset=utf8'
SQLALCHEMY_TRACK_MODIFICATIONS = True

如此在app/__init__.py中加入

app.config.from_object('config')
db = SQLAlchemy(app)

就可以完成app和數(shù)據(jù)的關(guān)聯(lián)，并生成一個可以操作app數(shù)據(jù)庫的SQLAlchemy實例db

完整的app/__init__.py代碼如下:

from flask import Flask, url_for, request, redirect, render_template
from flask_sqlalchemy import SQLAlchemy
app = Flask(__name__)
app.config.from_object('config')
db = SQLAlchemy(app)
from app import models,views

2.創(chuàng)建app/models.py模塊

上代碼

from app import db #db是在app/__init__.py生成的關(guān)聯(lián)后的SQLAlchemy實例

class User(db.Model):
 __tablename__ = 'users'
 id = db.Column(db.Integer, primary_key=True)
 username = db.Column(db.String(80), unique=True)
 email = db.Column(db.String(320), unique=True)
 password = db.Column(db.String(32), nullable=False)
 def __repr__(self):
  return '<User %r>' % self.username
class Admin(db.Model):
 __tablename__ = 'admins'
 id = db.Column(db.Integer, primary_key=True)
 username = db.Column(db.String(80), unique=True)
 email = db.Column(db.String(320), unique=True)
 password = db.Column(db.String(32), nullable=False)
 def __repr__(self):
  return '<User %r>' % self.username

3.創(chuàng)建create_db.py，表結(jié)構(gòu)設(shè)計完成后執(zhí)行python create_db.py即可完成表的創(chuàng)建,如下圖

#app/create_db.py

from app import db
db.create_all()

4.表已經(jīng)創(chuàng)建完成了，接下來是我們的業(yè)務(wù)邏輯使用表的時候了

分別在user和admin藍圖中增加一個add用戶的業(yè)務(wù)

#app/user.py

from flask import Blueprint, render_template, redirect,request
from app import db
from .models import User
user = Blueprint('user',__name__)
@user.route('/index')
def index():
 return render_template('user/index.html')
@user.route('/add/',methods=['GET','POST'])
def add():
 if request.method == 'POST':
  p_user = request.form.get('username',None)
  p_email = request.form.get('email',None)
  p_password = request.form.get('password',None)
  if not p_user or not p_email or not p_password:
   return 'input error'
  newobj = User(username=p_user, email=p_email, password=p_password)
  db.session.add(newobj)
  db.session.commit()
  users = User.query.all()
  return render_template('user/add.html',users=users)
 users = User.query.all()
 return render_template('user/add.html',users=users)
@user.route('/show')
def show():
 return 'user_show'

#app/admin.py

#admin.py
from flask import Blueprint,render_template, request, redirect
from app import db
from .models import Admin
admin = Blueprint('admin',__name__)
@admin.route('/index')
def index():
 return render_template('admin/index.html')
@admin.route('/add/',methods=['POST','GET'])
def add():
 if request.method == 'POST':
  p_admin = request.form.get('username',None)
  p_email = request.form.get('email',None)
  p_password = request.form.get('password',None)
  if not p_admin or not p_email or not p_password:
   return 'input error'
  newobj = Admin(username=p_admin, email=p_email, password=p_password)
  db.session.add(newobj)
  db.session.commit()
  admins = Admin.query.all()
  return render_template('admin/add.html',admins=admins)
 admins = Admin.query.all()
 return render_template('admin/add.html',admins=admins)
@admin.route('/show')
def show():
 return 'admin_show'

#app/templates/admin/add.html

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>AdminsAdd</title>
</head>
<body>
<form action="/admin/add/" method="POST">
 user:<input type="text" name="username" />
 email:<input type="text" name="email" />
 pwd:<input type="password" name="password" />
 <input type="submit" value="add" />
</form>
{% if admins %}
<table border="1px">
 <tr>
  <th>UserName</th>
  <th>Email</th>
 </tr>
 {% for u in admins %}
  <tr>
   <td>{{u.username}}</td>
   <td>{{u.email}}</td>
  </tr>
 {% endfor %}
</table>
{% endif %}
</body>
</html>

#app/templates/user/add.html

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>UserAdd</title>
</head>
<body>
<form action="/user/add/" method="POST">
 user:<input type="text" name="username" />
 email:<input type="text" name="email" />
 pwd:<input type="password" name="password" />
 <input type="submit" value="add" />
</form>
{% if users %}
<table border="1px">
 <tr>
  <th>UserName</th>
  <th>Email</th>
 </tr>
 {% for u in users %}
  <tr>
   <td>{{u.username}}</td>
   <td>{{u.email}}</td>
  </tr>
 {% endfor %}
</table>
{% endif %}
</body>
</html>

#app/views.py

from app import app
from .admin import admin
from .user import user
app.register_blueprint(admin,url_prefix='/admin')
app.register_blueprint(user, url_prefix='/user')

#run.py