python - Flask-SQLAlchemy 在创建表之前创建架构

Question

我正在尝试使用 Flask-SQLAlchemy 配置 MySQL 架构。我有一个名为 testdb 的架构和一些表。我将列出一张表，用户。到目前为止，此代码创建了所需的所有表，但仅当 testdb 已存在时才创建。有没有办法在连接之前检查并创建testdb？

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql://root:password@localhost/testdb'
db = SQLAlchemy(app)

class User(db.Model):
    userid = db.Column(db.Integer, primary_key=True, autoincrement=True)
    username = db.Column(db.String(16), unique=True, nullable=False)
    password = db.Column(db.String(16), unique=False, nullable=False)
    email = db.Column(db.String(80), unique=True, nullable=False)
    createdDate = db.Column(db.DateTime, default=datetime.utcnow, nullable=False)
    lastUpdated = db.Column(db.DateTime, default=datetime.utcnow, nullable=False)

db.create_all()

所需命令:

CREATE SCHEMA IF NOT EXISTS `testdb` ;

Answer 1

感谢@hygorxaraujo，我解决了这个问题请参阅下面的代码:

import sqlachemy

engine = sqlalchemy.create_engine('mysql://root:password@localhost') # connect to server
engine.execute("CREATE SCHEMA IF NOT EXISTS `testdb`;") #create db
engine.execute("USE testdb;") # select new db

app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql://root:mypassword@localhost/testdb'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False #Turn off annoying message
db = SQLAlchemy(app)