Question

从转储数据安装夹具时我遇到了奇怪的错误。我正在使用psycopg2和django1.1.1

silver:probsbox oleg$ python manage.py loaddata /Users/oleg/probs.json 
Installing json fixture '/Users/oleg/probs' from '/Users/oleg/probs'.
Problem installing fixture '/Users/oleg/probs.json': Traceback (most recent call last):
  File "/opt/local/lib/python2.5/site-packages/django/core/management/commands/loaddata.py", line 153, in handle
    obj.save()
  File "/opt/local/lib/python2.5/site-packages/django/core/serializers/base.py", line 163, in save
    models.Model.save_base(self.object, raw=True)
  File "/opt/local/lib/python2.5/site-packages/django/db/models/base.py", line 495, in save_base
    result = manager._insert(values, return_id=update_pk)
  File "/opt/local/lib/python2.5/site-packages/django/db/models/manager.py", line 177, in _insert
    return insert_query(self.model, values, **kwargs)
  File "/opt/local/lib/python2.5/site-packages/django/db/models/query.py", line 1087, in insert_query
    return query.execute_sql(return_id)
  File "/opt/local/lib/python2.5/site-packages/django/db/models/sql/subqueries.py", line 320, in execute_sql
    cursor = super(InsertQuery, self).execute_sql(None)
  File "/opt/local/lib/python2.5/site-packages/django/db/models/sql/query.py", line 2369, in execute_sql
    cursor.execute(sql, params)
  File "/opt/local/lib/python2.5/site-packages/django/db/backends/util.py", line 19, in execute
    return self.cursor.execute(sql, params)
ProgrammingError: can't adapt

首先，我在互联网上检查了类似的问题。这个似乎非常相关：http://code.djangoproject.com/ticket/5996，因为我的数据有许多非ASCII符号

但实际上我已经检查了我的django安装，它没关系

你能告诉我什么是错的

====

按照第一个答案的建议添加打印声明后继续调查。 Log看起来像这样：

silver:probsbox oleg$ python manage.py loaddata /Users/oleg/probs.json 
Installing json fixture '/Users/oleg/probs' from '/Users/oleg/probs'.
<DeserializedObject: Novice>
<DeserializedObject: Junior>
<DeserializedObject: Chess enthusiast>
<DeserializedObject: Experienced player >
<DeserializedObject: Smart player>
Problem installing fixture '/Users/oleg/probs.json': Traceback (most recent call last):
  File "/opt/local/lib/python2.5/site-packages/django/core/management/commands/loaddata.py", line 153, in handle
    print obj
  File "/opt/local/lib/python2.5/site-packages/django/core/serializers/base.py", line 155, in __repr__
    return "<DeserializedObject: %s>" % smart_str(self.object)
  File "/opt/local/lib/python2.5/site-packages/django/utils/encoding.py", line 107, in smart_str
    return str(s)
  File "/opt/local/lib/python2.5/site-packages/django/db/models/base.py", line 335, in __str__
    return force_unicode(self).encode('utf-8')
  File "/opt/local/lib/python2.5/site-packages/django/utils/encoding.py", line 71, in force_unicode
    s = unicode(s)
  File "/Users/oleg/Sites/probsbox/registration/models.py", line 58, in __unicode__
    return u"%s's profile" %(self.user.username)
  File "/opt/local/lib/python2.5/site-packages/django/db/models/fields/related.py", line 257, in __get__
    rel_obj = QuerySet(self.field.rel.to).get(**params)
  File "/opt/local/lib/python2.5/site-packages/django/db/models/query.py", line 305, in get
    % self.model._meta.object_name)
DoesNotExist: User matching query does not exist.

silver:probsbox oleg$

上一次评论错误

<DeserializedObject: qwert2000's profile>

问题安装夹具'/Users/oleg/probs.json'：Traceback（最近一次调用最后一次）：文件“/opt/local/lib/python2.5/site-packages/django/core/management/commands/loaddata.py”，第154行，句柄 obj.save（）文件“/opt/local/lib/python2.5/site-packages/django/core/serializers/base.py”，第163行，保存 models.Model.save_base（self.object，raw = True）在save_base中的文件“/opt/local/lib/python2.5/site-packages/django/db/models/base.py”，第495行 result = manager._insert（values，return_id = update_pk）在_insert中输入文件“/opt/local/lib/python2.5/site-packages/django/db/models/manager.py”，第177行 return insert_query（self.model，values，** kwargs）在insert_query中输入文件“/opt/local/lib/python2.5/site-packages/django/db/models/query.py”，第1087行 return query.execute_sql（return_id）在execute_sql中的文件“/opt/local/lib/python2.5/site-packages/django/db/models/sql/subqueries.py”，第320行 cursor = super（InsertQuery，self）.execute_sql（无）在execute_sql中的文件“/opt/local/lib/python2.5/site-packages/django/db/models/sql/query.py”，第2369行 cursor.execute（sql，params）文件“/opt/local/lib/python2.5/site-packages/django/db/backends/util.py”，第19行，执行 return self.cursor.execute（sql，params） ProgrammingError：无法适应

Answer 1

当psycopg2收到一个不知道如何转换为SQL语句值的数据类型时，会引发can't adapt错误。例如，如果您不小心传递了一个列表，例如，对于一个应该是整数的值，psycopg2会引发这个不能适应的错误。

psycopg2源代码发行版附带的faq.txt文档以这种方式解释：

为什么!cursor.execute()引发异常无法适应？

Psycopg通过查看转换SQL字符串表示形式的Python对象       在对象类。当你试图通过时会引发异常       作为查询参数，没有为其注册适配器的对象       它的班级。请参阅：ref：adapting-new-types了解信息。

~~找到有问题的值可能是你最好的第一遍是在完全详细模式下运行loaddata：python manage.py loaddata --verbosity = 2 /Users/oleg/probs.json~~

好吧，我希望loaddata详细程度可行，我不必承认我从来没有找到一种用django的loaddata调试自适应错误的优雅方法。在过去，我已经在django的loaddata函数中插入了print语句，以便在发生错误时可以看到反序列化的值。我已编辑django/core/management/loaddata.py。在obj.save()函数中查看handle()。我希望这个忏悔会激励某人分享更好的解决方案： - ）

Answer 2

好的，我结束了从我的数据库中复制转储，并在没有python的情况下在本地恢复...

django：从postgres数据库导入数据时无法调整错误

2 个答案: