使用 to_sql 将 pandas 数据帧导出到访问 table 生成错误

exporting pandas dataframe into a access table using to_sql generate error

我正在尝试使用 sqlalchemy-access 库将数据框插入访问数据库:

我的代码是:

import msaccessdb
import pyodbc
import pandas as pd

print(pyodbc.version)
db_file = r'database\sampledatabase.accdb'
input_csv_file= r'database\sample_data.csv'
print(input_csv_file)
msaccessdb.create(db_file)
cnxn_str = (
    r'DRIVER={{Microsoft Access Driver (*.mdb, *.accdb)}};'
    r'DBQ={};'
    r'ExtendedAnsiSQL=1;'.format(db_file)
)
print(cnxn_str)
cnxn = pyodbc.connect(cnxn_str,autocommit=True)
input_data=pd.read_csv(input_csv_file)
input_data.to_sql('sample_table', cnxn, index=False, if_exists='replace')
cnxn.close()

但是当我 运行 这段代码时,我得到了这个错误:

Execution failed on sql 'SELECT name FROM sqlite_master WHERE type='table' AND name=?;': ('42S02', "[42S02] [Microsoft][ODBC Microsoft Access Driver] The Microsoft Access database engine cannot find the input table or query 'sqlite_master'. Make sure it exists and that its name is spelled correctly. (-1305) (SQLExecDirectW)")

当我试图运行这一行时产生错误:

input_data.to_sql('sample_table', cnxn, index=False, if_exists='replace')

这段代码有什么问题,我该如何解决?

编辑 1

根据评论和此 post,我将代码更改为:

import msaccessdb
import pandas as pd
from sqlalchemy import create_engine
import urllib

db_file = r'database\sampledatabase.accdb'
input_csv_file= r'database\sample_data.csv'

msaccessdb.create(db_file)
cnxn_str = (
    r'DRIVER={{Microsoft Access Driver (*.mdb, *.accdb)}};'
    r'DBQ={};'
    r'ExtendedAnsiSQL=1;'.format(db_file)
)
params = urllib.parse.quote_plus(cnxn_str)
engine = create_engine("mssql+pyodbc:///?odbc_connect=%s" % params)

print(cnxn_str)
create_engine("access+pyodbc://@your_dsn")
input_data=pd.read_csv(input_csv_file)
input_data.to_sql('sample_table', engine, index=False, if_exists='replace')

但我仍然收到错误消息:

(pyodbc.ProgrammingError) ('42000', "[42000] [Microsoft][ODBC Microsoft Access Driver] Undefined function 'schema_name' in expression. (-3102) (SQLExecDirectW)")
[SQL: SELECT schema_name()]
(Background on this error at: http://sqlalche.me/e/14/f405)

编辑 2

复制这里所说的内容:https://github.com/gordthompson/sqlalchemy-access/wiki/Getting-Connected#connecting-with-an-odbc-connection-string

所以代码现在看起来是这样的:

import msaccessdb
import pandas as pd
from sqlalchemy import create_engine
import urllib

db_file = r'database\sampledatabase.accdb'
input_csv_file= r'database\sample_data.csv'

msaccessdb.create(db_file)
connection_string = (
    r'DRIVER={{Microsoft Access Driver (*.mdb, *.accdb)}};'
    r'DBQ=database\sample_data.csv;'
    r'ExtendedAnsiSQL=1;'
)
connection_uri = f"access+pyodbc:///?odbc_connect={urllib.parse.quote_plus(connection_string)}"
engine = create_engine(connection_uri)

input_data=pd.read_csv(input_csv_file)
input_data.to_sql('sample_table', engine, index=False, if_exists='replace')

但我仍然收到此错误:

(pyodbc.Error) ('IM012', '[IM012] [Microsoft][ODBC Driver Manager] DRIVER keyword syntax error (0) (SQLDriverConnect)')
(Background on this error at: http://sqlalche.me/e/14/dbapi)

请注意,我的系统上安装了Access。

驱动程序名称周围有两组大括号……

connection_string = (
    r'DRIVER={{Microsoft Access Driver (*.mdb, *.accdb)}};'
    r'DBQ=database\sampledatabase.accdb;'
    r'ExtendedAnsiSQL=1;'
)
connection_uri = f"access+pyodbc:///?odbc_connect={urllib.parse.quote_plus(connection_string)}"
engine = create_engine(connection_uri)

... 但是因为您使用的是 r'string'(不是 f'string'),所以您应该只有一对大括号:

connection_string = (
    r'DRIVER={Microsoft Access Driver (*.mdb, *.accdb)};'
    r'DBQ=database\sampledatabase.accdb;'
    r'ExtendedAnsiSQL=1;'
)
connection_uri = f"access+pyodbc:///?odbc_connect={urllib.parse.quote_plus(connection_string)}"
engine = create_engine(connection_uri)