详解Flask数据库的连接与使用

目录

数据库连接配置创建实体类配置打印SQL语句或、与、非和排序

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数据库内容请搜索中国红客联盟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中国红客联盟！