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python - SQLAlchemy TypeError: ('Params must be in a list, tuple, or Row', 'HY000')

问题描述

我有一个使用 sqlalchemy 的方法

    def insert_amended_values(self, data):
        insert_stmt = """INSERT INTO amended (date, volume, price, updated)
        VALUES (%(date)s, %(volume)s, %(price)s, %(updated)s);"""
        crsr = self.connection.engine.raw_connection().cursor()
        crsr.executemany(insert_stmt, data)

哪个是字典列表的数据，例如

[
    {'date': '2020-06-27', 'volume': '30', 'price': 50, 'updated': '2020-10-21 17:17:50'},
    {'date': '2020-06-28', 'volume': '32', 'price': 48, 'updated': '2020-10-21 17:17:50'},
    {'date': '2020-06-29', 'volume': '26', 'price': 56, 'updated': '2020-10-21 17:17:50'}
]

但我得到了错误TypeError: ('Params must be in a list, tuple, or Row', 'HY000')

如何在保留参数化查询的同时将字典列表转换为列表或行列表？

谢谢

标签： pythonsql-serversqlalchemy

解决方案

将您的数据保留在listof 中dict，将您的 SQL 语句包装在 SQLAlchemytext对象中并使用:name参数样式

import sqlalchemy as sa

# …

    def insert_amended_values(self, data):
        insert_stmt = sa.text("""INSERT INTO amended (date, volume, price, updated)
        VALUES (:date, :volume, :price, :updated);""")
        with self.connection.engine.begin() as conn:
            conn.execute(insert_stmt, data)

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