Question

我不想使用默认的主键，因此我自定义了一个名为cid的主键，但是我什至无法保存一个数据。有人帮我吗？

我的代码（peewee 3.9.2）：

from peewee import *
db = SqliteDatabase(r'peewee.db')
class BaseModel(Model):
    class Meta:
        database=db

class Case(BaseModel):
    cid=IntegerField(primary_key=True)

db.create_tables([Case,])
c1=Case(cid=1)
c1.save()

回溯（最近通话最近一次）：

  File "C:\Users\pcell\AppData\Local\Programs\Python\Python36\lib\site-packages\peewee.py", line 2835, in execute_sql
    cursor.execute(sql, params or ())
sqlite3.OperationalError: near "WHERE": syntax error

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Program Files\JetBrains\PyCharm 2018.2\helpers\pydev\pydevd.py", line 1664, in <module>
    main()
  File "C:\Program Files\JetBrains\PyCharm 2018.2\helpers\pydev\pydevd.py", line 1658, in main
    globals = debugger.run(setup['file'], None, None, is_module)
  File "C:\Program Files\JetBrains\PyCharm 2018.2\helpers\pydev\pydevd.py", line 1068, in run
    pydev_imports.execfile(file, globals, locals)  # execute the script
  File "C:\Program Files\JetBrains\PyCharm 2018.2\helpers\pydev\_pydev_imps\_pydev_execfile.py", line 18, in execfile
    exec(compile(contents+"\n", file, 'exec'), glob, loc)
  File "C:/Users/sanakan/PycharmProjects/xingshianjian/orm.py", line 12, in <module>
    c1.save()
  File "C:\Users\pcell\AppData\Local\Programs\Python\Python36\lib\site-packages\peewee.py", line 5914, in save
    rows = self.update(**field_dict).where(self._pk_expr()).execute()
  File "C:\Users\pcell\AppData\Local\Programs\Python\Python36\lib\site-packages\peewee.py", line 1698, in inner
    return method(self, database, *args, **kwargs)
  File "C:\Users\pcell\AppData\Local\Programs\Python\Python36\lib\site-packages\peewee.py", line 1769, in execute
    return self._execute(database)
  File "C:\Users\pcell\AppData\Local\Programs\Python\Python36\lib\site-packages\peewee.py", line 2236, in _execute
    cursor = database.execute(self)
  File "C:\Users\pcell\AppData\Local\Programs\Python\Python36\lib\site-packages\peewee.py", line 2848, in execute
    return self.execute_sql(sql, params, commit=commit)
  File "C:\Users\pcell\AppData\Local\Programs\Python\Python36\lib\site-packages\peewee.py", line 2842, in execute_sql
    self.commit()
  File "C:\Users\pcell\AppData\Local\Programs\Python\Python36\lib\site-packages\peewee.py", line 2627, in __exit__
    reraise(new_type, new_type(*exc_args), traceback)
  File "C:\Users\pcell\AppData\Local\Programs\Python\Python36\lib\site-packages\peewee.py", line 178, in reraise
    raise value.with_traceback(tb)
  File "C:\Users\pcell\AppData\Local\Programs\Python\Python36\lib\site-packages\peewee.py", line 2835, in execute_sql
    cursor.execute(sql, params or ())
peewee.OperationalError: near "WHERE": syntax error

Answer 1

IntegerField(primary_key=True)与AutoField() 不同。如果要自动递增整数ID，则应使用AutoField：

cid = AutoField()  # Implies primary_key=True

如果要手动指定整数ID，则可以使用：

cid = IntegerField(primary_key=True)  # You will specify the ID values.

使用自动字段时，一切都应按预期工作。

在使用非自动递增的主键时，如IntegerField(primary_key=True)，Peewee无法知道何时调用.save()是创建（INSERT）还是更新。因此，在使用用户指定的主键时，需要调用.save(force_insert=True)来生成INSERT。否则peewee会认为您的意思是更新。

http://docs.peewee-orm.com/en/latest/peewee/models.html#primary-keys-composite-keys-and-other-tricks

为什么自定义IntegerField primary_key时无法保存数据？

1 个答案: