无法删除或更新父行：外键约束失败 SQL 错误

Question

I'm trying to delete the product row using the delete button on y frontend(frontend is in reactjs) but it throws this error message on the python SQL server. ysql.connector.errors.IntegrityError: 1451 (23000): Cannot delete or update a parent row: a foreign key constraint fails ( grocery_store . order_details , CONSTRAINT fk_product_id FOREIGN KEY ( product_id ) REFERENCES products ( product_id ) ON UPDATE RESTRICT)

delete route code:

@app.route('/delete', methods=['POST'])
def delete_product():
    return_id = products_dao.delete_product(connection, request.json["product_id"])
    response = jsonify({
        'product_id': return_id
    })
    response.headers.add('Access-Control-Allow-Origin', '*')
    return return_id

product_dao.py file code

def delete_product(connection, product_id):
    cursor = connection.cursor()
    query = ("DELETE FROM products where product_id={}".format(product_id))
    cursor.execute(query)
    connection.commit()
    return "product deleted"

Postman Request:

Answer 1

Your error is self explanatory, you have foreign key references you have to either first delete/update values in the child table and then to parent or use ON DELETE/UPDATE CASCADE which will automatically do the same