python - SQLalchemy: alembic bulk_insert() 失败

Question

在将其标记为重复之前:

我确实看过这个question/answer ，我确实按照它的建议做了，但是当我添加这段代码时:

permslookup = sa.Table('permslookup',
    sa.Column('perms_lookup_id', primary_key=True),
    sa.Column('name', sa.Unicode(40), index=True),
    sa.Column('description', sa.Text),
    sa.Column('value', sa.Numeric(10, 2)),
    sa.Column('ttype', sa.PickleType(), index=True),
    sa.Column('permission', sa.Unicode(40), index=True),
    sa.Column('options', sa.PickleType())
    )

然后运行alembic upgrade head，我得到以下错误:

AttributeError: Neither 'Column' object nor 'Comparator' object has an attribute 'schema'

当我检查完整的堆栈跟踪时，我注意到这是导致错误的原因:

sa.Column('options', sa.PickleType())

这是上面代码的最后一行......我该如何解决这个问题？我不知道如何解决它......任何形式的帮助将不胜感激。

这里是我要插入的数据:

op.bulk_insert('permslookup',
    [
        {
            'id': 1,
            'name': 'accounts',
            'description': """ Have permission to do all transactions """,
            'value': 1,
            'ttype': ['cash', 'loan', 'mgmt', 'deposit', 'adjustments'],
            'permission': 'accounts',
            'options': None
        },
        {
            'id': 2,
            'name': 'agent_manage',
            'description': """ Have permission to do cash, cash, loan and Management Discretion transactions """,
            'value': 2,
            'ttype': ['cash', 'loan', 'mgmt'],
            'permission': 'agent_manage',
            'options': None
        },
        {
            'id': 3,
            'name': 'corrections',
            'description': """ Have permission to do cash, loan and adjustments transactions """,
            'value': 3,
            'ttype': ['cash', 'loan', 'adjustments'],
            'permission': 'corrections',
            'options': None
        },
        {
            'id': 4,
            'name': 'cashup',
            'description': """ Have permission to do cash and loan transactions """,
            'value': 4,
            'ttype': ['cash', 'loan'],
            'permission': 'cashup',
            'options': None
        },

    ]
)

我在尝试运行 bulk_insert 时得到的原始错误是:

AttributeError: 'str' object has no attribute '_autoincrement_column'

Answer 1

对于错误 #1，信息不足。需要堆栈跟踪。

对于 #2，bulk_insert() 接收 Table 对象，而不是字符串名称作为参数。

参见 http://alembic.readthedocs.org/en/latest/ops.html#alembic.operations.Operations.bulk_insert :

from alembic import op
from datetime import date
from sqlalchemy.sql import table, column
from sqlalchemy import String, Integer, Date

# Create an ad-hoc table to use for the insert statement.
accounts_table = table('account',
    column('id', Integer),
    column('name', String),
    column('create_date', Date)
)

op.bulk_insert(accounts_table,
    [
        {'id':1, 'name':'John Smith',
                'create_date':date(2010, 10, 5)},
        {'id':2, 'name':'Ed Williams',
                'create_date':date(2007, 5, 27)},
        {'id':3, 'name':'Wendy Jones',
                'create_date':date(2008, 8, 15)},
    ]
)