如何使用帶有藍圖的flask_mysqldb

Question

我正在使用帶有藍圖的flask_mysqldb，我想初始化MySQL，但出現錯誤：

app.config.setdefault('MYSQL_HOST', 'localhost') AttributeError: 'Blueprint' 對象沒有屬性 'config'

我在這里創建應用程序

from flask import Flask
from flask_cors import CORS
from .bodega import bodega


def create_app():
    app = Flask(__name__)
    cors = CORS(app, resources=r'/*')

    app.config['MYSQL_HOST'] = "localhost"
    app.config['MYSQL_USER'] = "root"  # Usuario de la base de datos
    app.config['MYSQL_PASSWORD'] = ""  # Contraseña de la base de datos
    app.config['MYSQL_DB'] = "inventario_bodega"  # Nombre de la base de datos
    app.config['SECRET_KEY'] = 'thisisthesecrectkey_de_uepc_2019'
    # app.config.from_object(Config)

    app.register_blueprint(bodega)

    return app

那是我的藍圖

from flask import Blueprint
bodega = Blueprint("bodega", __name__, url_prefix="/bodega")
from . import views

在這里我想使用 MySQL

from flask import jsonify
from datetime import datetime

from . import bodega
from flask_mysqldb import MySQL

# the error is here
mysql = MySQL(bodega)


@bodega.route('/show', methods=['GET'])
def show_bodega():
    try:
        cur = mysql.connection.cursor()
        cur.execute(
            """SELECT * FROM bodega 
            join item on bodega.id_item = item.id_item 
            join usuarios on bodega.id_usuario = usuarios.id_usuario 
            join images on bodega.id_image = images.id_image"""
        )
        data = cur.fetchall()
        cur.close()
        return jsonify(data), 202
    except:
        return "Error al extraer datos", 500

應用程序要求我將配置傳遞給藍圖，但我不知道如何

Answer 1

問題出在以下行

mysql = MySQL(bodega)

相反，您應該將應用程序傳遞給MySQL

app = create_app()
mysql = MySQL(app)

更多考慮，閱讀文檔： https : //flask-mysqldb.readthedocs.io/en/latest/

Answer 2

這個圖書館在我看來幾乎死了。 github repo上幾乎沒有任何活動，所有這些都將被flask-sqlalchemy覆蓋。

---

您不想在藍圖中初始化數據庫連接。 您希望在您的應用程序工廠中使用它。

from flask import Flask
from flask_cors import CORS
from .bodega import bodega

from flask_mysqldb import MySQL # Add the import in __init__

db = MySQL()


def create_app():
    app = Flask(__name__)
    cors = CORS(app, resources=r'/*')

    app.config['MYSQL_HOST'] = "localhost"
    app.config['MYSQL_USER'] = "root"
    app.config['MYSQL_PASSWORD'] = ""
    app.config['MYSQL_DB'] = "inventario_bodega"
    app.config['SECRET_KEY'] = 'thisisthesecrectkey_de_uepc_2019'

    db.init_app(app) # Initialise with the new app

    app.register_blueprint(bodega)

    return app

然后將數據庫 (db) 導入您的藍圖中

from flask import jsonify
from datetime import datetime

from . import bodega
from flask_mysqldb import MySQL

from app import db # Import from app here


@bodega.route('/show', methods=['GET'])
def show_bodega():
    try:
        cur = db.connection.cursor() # create a cursor
        cur.execute(
            """SELECT * FROM bodega 
            join item on bodega.id_item = item.id_item 
            join usuarios on bodega.id_usuario = usuarios.id_usuario 
            join images on bodega.id_image = images.id_image"""
        )
        data = cur.fetchall()
        cur.close()
        return jsonify(data), 202
    except:
        return "Error al extraer datos", 500