IT俱乐部 Python 详解Flask数据库的连接与使用

详解Flask数据库的连接与使用

发布: 2023年 3月 28日 490阅读

目录

数据库连接配置

HOST = "XXXXXXXXXXXXX"
PORT = 3310
USERNAME = "root"
PASSWORD = "@XXXXXXXXXXX"
DATABASE = "mydb"
  
SQLALCHEMY_DATABASE_URI = f"mysql+pymysql://{USERNAME}:{quote(PASSWORD)}@{HOST}:{PORT}/{DATABASE}?charset=utf8mb4"
SQLALCHEMY_TRACK_MODIFICATIONS = False
SQLALCHEMY_ECHO = True

创建实体类

from exts.DBServer import db
from sqlalchemy import Column, Integer, String, Date, DateTime
  
  
class Article(db.Model):
    __tablename__ = "article"
    id = Column(Integer, primay_key=True, autoincrement=True)
    title = Column(String(100), nullable=True)
    pub_time = Column(DateTime, nullable=True)
    author = Column(String(100), nullable=True)
    content = Column(String(10000), nullable=True)
    origin = Column(String(1000), nullable=True)

controller:

import json
  
from flask.blueprints import Blueprint
from exts.DBServer import db
from ..model.Article import Article
from flask_sqlalchemy.query import Query
from flask_restful import marshal
from flask_restful import fields
  
article_bp = Blueprint("article", __name__, url_prefix="/article")
  
article_fields = {
    "id": fields.Integer,
    "title": fields.String,
    "pub_time": fields.DateTime,
    "author": fields.String,
    "content": fields.String,
    "origin": fields.String
}
  
  
@article_bp.route("/queryAll")
def queryAll():
    query: Query = Article.query
    articles = query.all()
    article = query.get(1)
    article2 = query.filter_by(author="XXX")
    return json.dumps(marshal(articles, fields=article_fields),ensure_ascii=False)

配置打印SQL语句

from exts.DBServer import db
from sqlalchemy import Column, Integer, String
  
  
class User(db.Model):
    __tablename__ = "user"
    id = Column(Integer, primary_key=True, autoincrement=True)
    username = Column(String(100), nullable=True)
    password = Column(String(100), nullable=True)
  
    def __repr__(self):
        return "User %r" % self.body

或、与、非和排序

@user_bp.route("/query")
def query_match():
    query: Query = User.query
    result = query.filter(or_(User.username.contains("祥"), User.id == 1))
  
    return json.dumps(marshal(result.all(), fields=user_fields), ensure_ascii=False)
  
  
@user_bp.route("/in")
def in_sql():
    query: Query = User.query
    result = query.order_by(-User.password, -User.id)
    return json.dumps(marshal(result.all(), fields=user_fields), ensure_ascii=False)

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