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我正在尝试保存一组父/子记录，并且我想将插入包装在事务中。我将 SQLAlchemy 与 postgresql 8.4 一起使用。

这是我的代码片段：

def insert_data(parent, child_rows):
    # Start a transaction
    conn = _get_connection()
    tran = conn.begin()

    try:
        sql = get_sql_from_parent(parent)
        res = conn.execute(sql)  # <- Code barfs at this line
        item = res.fetchone() if res else None
        parent_id = item['id'] if ((item) and ('id' in item)) else -1

        if parent_id == -1:
            raise Exception('Parent could not be saved in database')

        # Import children
        for child in child_rows:
            child_sql = get_child_sql(parent_id, child)                        
            conn.execute(child_sql)

        tran.commit()

    except IntegrityError:
        pass  # rollback?

    except Exception as e:
        tran.rollback()
        print "Exception in user code:"
        print '-'*60
        traceback.print_exc(file=sys.stdout)
        print '-'*60

当我调用该函数时，我得到以下堆栈跟踪：

Traceback (most recent call last):
  File "import_data.py", line 125, in <module>
    res = conn.execute(sql)
  File "/usr/local/lib/python2.6/dist-packages/SQLAlchemy-0.7.4-py2.6-linux-x86_64.egg/sqlalchemy/engine/base.py", line 1405, in execute
    params)
  File "/usr/local/lib/python2.6/dist-packages/SQLAlchemy-0.7.4-py2.6-linux-x86_64.egg/sqlalchemy/engine/base.py", line 1582, in _execute_text
    statement, parameters
  File "/usr/local/lib/python2.6/dist-packages/SQLAlchemy-0.7.4-py2.6-linux-x86_64.egg/sqlalchemy/engine/base.py", line 1646, in _execute_context
    context)
  File "/usr/local/lib/python2.6/dist-packages/SQLAlchemy-0.7.4-py2.6-linux-x86_64.egg/sqlalchemy/engine/base.py", line 1639, in _execute_context
    context)
  File "/usr/local/lib/python2.6/dist-packages/SQLAlchemy-0.7.4-py2.6-linux-x86_64.egg/sqlalchemy/engine/default.py", line 330, in do_execute
    cursor.execute(statement, parameters)
InternalError: (InternalError) current transaction is aborted, commands ignored until end of transaction block
...

有谁知道我为什么会收到这个神秘的错误 - 我该如何解决？

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1 回答 1

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您可以在 postgresql 上激活日志查询吗？（在 postgresql.conf 中将 min_duration 设置为 0 然后重新启动）。

然后查看您的 postgresql 日志以对其进行调试。

于 2012-06-05T11:53:32.527 回答