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[英]IntegrityError: (1451, 'Cannot delete or update a parent row: a foreign key constraint fails (..))
[英]Cannot delete or update a parent row: a foreign key constraint fails SQL error
我正在尝试使用 y 前端(前端在 reactjs 中)上的删除按钮删除产品行,但它会在 python SQL 服务器上引发此错误消息。 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)
删除路线代码:
@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 文件代码
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"
您的错误是不言自明的,您有外键引用,您必须先删除/更新子表中的值,然后再删除父表,或者使用ON DELETE/UPDATE CASCADE
自动执行相同操作
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