I think you should read Flask SqlAlchemy's One-to-Many Relationships for more details. From shell.c in the SQLite repository, todays version in the trunk, two queries. In order to create a foreign key, you must first create the column: CREATE TABLE IF NOT EXISTS images ( nameRed VARCHAR(20) NOT NULL PRIMARY KEY, patientID INT, FOREIGN KEY (patientID) REFERENCES patients(id) ) Please note: I moved the primary key column (nameRed) first in the list of columns created, but that's just convention. It does not allow you to assign variable like d = Alert(88, 'trdft') schema instruction, and use GREP to filter lines containing REFERENCES. Name = db.Column(db.String(ALERT_NAME_MAX_SIZE), nullable=False) Defining circular foreign keys works just fine for me. SQL Server will check that the modification doesn. I believe your issue is actually how you are defining your foreign keys. User_id = db.Column(db.BigInteger, db.ForeignKey('er_id'), nullable=False) If the table is referenced by any foreign key constraints, its very likely that they target the primary key. The number of columns in a table is limited by the SQLITEMAXCOLUMN compile-time parameter. User_id = db.Column(db.BigInteger, primary_key=True)Īlerts = db.relationship('Alert', backref='user', lazy='dynamic')Īlert_id = db.Column(db.Integer, primary_key=True, autoincrement=True) The other constraints - NOT NULL, CHECK, UNIQUE, PRIMARY KEY and FOREIGN KEY constraints - impose restrictions on the table data. I have an issue with foreign key in Flask.
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