我有一个数据库，其中有一个名为blob_nlp的表。该表的索引是一个名为twid的外键字段。
column_name data_type
0 twid double precision
1 user_id double precision
2 is_retweet boolean
3 bpol double precision
4 bsubj double precision
5 bnp text
除twid字段外，该表为空。我想用DataFrame中的值填充这些空字段。
但是，当我尝试将outputdf数据框中的行插入PostGres时，SQLAlchemy会引发CompileError。我在做什么错了？
这是我的代码中不起作用的部分。
engine = create_engine('postgresql+psycopg2://{user}:{password}@{hostip}/{db}'.format(**dbkeys))
# Get metadata objects for tables in database
metadata = MetaData(engine, reflect=True)
tweets = metadata.tables['tweets']
authinfo = metadata.tables['authinfo']
twerrors = metadata.tables['twerrors']
for index, row in outputdf.iterrows():
query = """INSERT INTO blob_nlp (twid, bpol, bsubj, bnp) VALUES (%s, %s, %s, %s);"""
data = (row.twid, row.bpol, row.bsubj, row.bnp)
engine.execute(query, data)
inserttw = insert(tweets).values(twid = row.twid, user_id = row.user_id, is_retweet = row.is_retweet, bpol = row.bpol, bsubj=row.bsubj, bnp=row.bnp)
# If there the record is already in the database, update existing fields (upsert).
upsert1 = inserttw.on_conflict_do_update(index_elements=['twid'], set_={'twid': row.twid, 'user_id' : row.user_id,
'is_retweet': row.is_retweet, 'bpol': row.bpol,
'bsubj': row.bsubj, 'bnp': row.bnp})
错误：
---------------------------------------------------------------------------
CompileError Traceback (most recent call last)
<ipython-input-38-2cc7fceca8e0> in <module>
95 'bsubj': row.bsubj, 'bnp': row.bnp})
96
---> 97 engine.execute(upsert1)
98
99
~/anaconda3/lib/python3.6/site-packages/sqlalchemy/engine/base.py in execute(self, statement, *multiparams, **params)
2073
2074 connection = self.contextual_connect(close_with_result=True)
-> 2075 return connection.execute(statement, *multiparams, **params)
2076
2077 def scalar(self, statement, *multiparams, **params):
~/anaconda3/lib/python3.6/site-packages/sqlalchemy/engine/base.py in execute(self, object, *multiparams, **params)
946 raise exc.ObjectNotExecutableError(object)
947 else:
--> 948 return meth(self, multiparams, params)
949
950 def _execute_function(self, func, multiparams, params):
~/anaconda3/lib/python3.6/site-packages/sqlalchemy/sql/elements.py in _execute_on_connection(self, connection, multiparams, params)
267 def _execute_on_connection(self, connection, multiparams, params):
268 if self.supports_execution:
--> 269 return connection._execute_clauseelement(self, multiparams, params)
270 else:
271 raise exc.ObjectNotExecutableError(self)
~/anaconda3/lib/python3.6/site-packages/sqlalchemy/engine/base.py in _execute_clauseelement(self, elem, multiparams, params)
1051 inline=len(distilled_params) > 1,
1052 schema_translate_map=self.schema_for_object
-> 1053 if not self.schema_for_object.is_default else None)
1054
1055 ret = self._execute_context(
<string> in <lambda>(self, bind, dialect, **kw)
~/anaconda3/lib/python3.6/site-packages/sqlalchemy/sql/elements.py in compile(self, default, bind, dialect, **kw)
440 else:
441 dialect = default.StrCompileDialect()
--> 442 return self._compiler(dialect, bind=bind, **kw)
443
444 def _compiler(self, dialect, **kw):
~/anaconda3/lib/python3.6/site-packages/sqlalchemy/sql/elements.py in _compiler(self, dialect, **kw)
446 Dialect."""
447
--> 448 return dialect.statement_compiler(dialect, self, **kw)
449
450 def __str__(self):
~/anaconda3/lib/python3.6/site-packages/sqlalchemy/sql/compiler.py in __init__(self, dialect, statement, column_keys, inline, **kwargs)
451 # dialect.label_length or dialect.max_identifier_length
452 self.truncated_names = {}
--> 453 Compiled.__init__(self, dialect, statement, **kwargs)
454
455 if (
~/anaconda3/lib/python3.6/site-packages/sqlalchemy/sql/compiler.py in __init__(self, dialect, statement, bind, schema_translate_map, compile_kwargs)
217 if self.can_execute:
218 self.execution_options = statement._execution_options
--> 219 self.string = self.process(self.statement, **compile_kwargs)
220
221 @util.deprecated("0.7", ":class:`.Compiled` objects now compile "
~/anaconda3/lib/python3.6/site-packages/sqlalchemy/sql/compiler.py in process(self, obj, **kwargs)
243
244 def process(self, obj, **kwargs):
--> 245 return obj._compiler_dispatch(self, **kwargs)
246
247 def __str__(self):
~/anaconda3/lib/python3.6/site-packages/sqlalchemy/sql/visitors.py in _compiler_dispatch(self, visitor, **kw)
79 raise exc.UnsupportedCompilationError(visitor, cls)
80 else:
---> 81 return meth(self, **kw)
82 else:
83 # The optimization opportunity is lost for this case because the
~/anaconda3/lib/python3.6/site-packages/sqlalchemy/sql/compiler.py in visit_insert(self, insert_stmt, asfrom, **kw)
2057
2058 crud_params = crud._setup_crud_params(
-> 2059 self, insert_stmt, crud.ISINSERT, **kw)
2060
2061 if not crud_params and \
~/anaconda3/lib/python3.6/site-packages/sqlalchemy/sql/crud.py in _setup_crud_params(compiler, stmt, local_stmt_type, **kw)
55 try:
56 if local_stmt_type in (ISINSERT, ISUPDATE):
---> 57 return _get_crud_params(compiler, stmt, **kw)
58 finally:
59 if should_restore:
~/anaconda3/lib/python3.6/site-packages/sqlalchemy/sql/crud.py in _get_crud_params(compiler, stmt, **kw)
144 raise exc.CompileError(
145 "Unconsumed column names: %s" %
--> 146 (", ".join("%s" % c for c in check))
147 )
148
CompileError: Unconsumed column names: bsubj, bpol, bnp