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詳解Flask數(shù)據(jù)庫的連接與使用

更新時間：2023年02月24日 15:35:25 作者：雙天至尊-王天龍

這篇文章主要為大家想想介紹了Python中Flask數(shù)據(jù)庫的連接與使用，文中的示例代碼講解詳細，具有一定的借鑒價值，感興趣的小伙伴可以學(xué)習(xí)一下

數(shù)據(jù)庫連接配置

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

創(chuàng)建實體類

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語句

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、與、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)

到此這篇關(guān)于詳解Flask數(shù)據(jù)庫的連接與使用的文章就介紹到這了,更多相關(guān)Flask數(shù)據(jù)庫內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！

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