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详解Flask数据库的连接与使用

作者:双天至尊-王天龙

这篇文章主要为大家想想介绍了Python中Flask数据库的连接与使用,文中的示例代码讲解详细,具有一定的借鉴价值,感兴趣的小伙伴可以学习一下

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)

到此这篇关于详解Flask数据库的连接与使用的文章就介绍到这了,更多相关Flask数据库内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!

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