Question

我有以下脚本来更新我正在构建的烧瓶Web应用程序的数据库，以自学SQLAlchemy。

from FeedReader import api
from FeedReader import db_session
from FeedReader.models import Article

# Get values for a single record
res = api.get_one().__next__() 

# Create the record to be added
article = Article(**res)

# Does this show that the datatypes for `article` match the datatypes in the schema?
for key, val in res.items():
    print(key, type(val), type(article.__getattribute__(key)))

# Attempt to add the record, and get an IntegrityError
db_session.add(article)
db_session.commit()

首先运行脚本会打印以下输出：

source <class 'str'> <class 'str'>
id <class 'str'> <class 'str'>
link_url <class 'str'> <class 'str'>
author <class 'str'> <class 'str'>
content <class 'str'> <class 'str'>
publish_date <class 'datetime.date'> <class 'datetime.date'>
source_date <class 'datetime.date'> <class 'datetime.date'>
family <class 'str'> <class 'str'>
title <class 'str'> <class 'str'>

这些数据类型与我宣布我的Article模型的方式相符：

class Article(Base):

    __tablename__ = "Articles"
    id = Column(Text, primary_key=True)
    read_flag = Column(Boolean, default=False)
    link_url = Column(Text)
    source = Column(Text)
    family = Column(Text)
    title = Column(Text)
    publish_date = Column(Date)
    source_date = Column(Date)
    author = Column(Text)
    content = Column(Text)

但是对db_session.commit()的调用会产生以下IntegrityError

IntegrityError: (sqlite3.IntegrityError) datatype mismatch [SQL: 'INSERT INTO "Articles" (id, read_flag, link_url, source, family, title, publish_date, source_date, author, content) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)'] ...

我是否误解了IntegrityError的原因？为什么我能够创建一个具有不正确的模式数据类型的Article对象？

尽管匹配数据类型，SQLAlchemy完整性错误

0 个答案: