Writing python (pandas) Data Frame to SQL Database Error

问题

I am trying to put a python data frame to a MS SQL DB and I am getting the following error

FUNCTION

def put_to_server(df):       # df is a pandas data frame
   server="KORNBSVM04\MSSQLSERVER2012"
   Driver="{SQL Server}"
   userid=''
   pswd=''
   cnxn = pyodbc.connect(driver=Driver, server=server, database="CIHOTLINE",uid=userid, pwd=pswd)
   cur=cnxn.cursor()
   df.to_sql(name='dbo.test',con=cnxn)

ERROR

 File "C:\Python27\lib\site-packages\pandas\core\generic.py", line 950, in to_sql
index_label=index_label)
File "C:\Python27\lib\site-packages\pandas\io\sql.py", line 475, in to_sql
index_label=index_label)
File "C:\Python27\lib\site-packages\pandas\io\sql.py", line 1084, in to_sql
index_label=index_label)
File "C:\Python27\lib\site-packages\pandas\io\sql.py", line 543, in __init__
if self.pd_sql.has_table(self.name):
File "C:\Python27\lib\site-packages\pandas\io\sql.py", line 1094, in has_table
return len(self.execute(query).fetchall()) > 0
File "C:\Python27\lib\site-packages\pandas\io\sql.py", line 1041, in execute
raise_with_traceback(ex)
File "C:\Python27\lib\site-packages\pandas\io\sql.py", line 1030, in execute
cur.execute(*args)
pandas.io.sql.DatabaseError: Execution failed on sql: SELECT name FROM sqlite_master WHERE type='table' AND name='dbo.test';

回答1:

SQL server was never supported before pandas 0.14 (only mysql and sqlite were, with default of sqlite. Hence the error you get), but from pandas 0.14 it is supported to write dataframes to MS SQL server.
But to use this, you have to use an sqlalchemy engine (see docs) instead of a pyobdc connection object. Eg:

from sqlalchemy import create_engine
engine = create_engine('mssql+pyodbc://scott:tiger@mydsn')
df.to_sql('test', engine)

See the pandas documentation on this: http://pandas.pydata.org/pandas-docs/stable/io.html#sql-queries

来源：https://stackoverflow.com/questions/26055556/writing-python-pandas-data-frame-to-sql-database-error

标签

python

sql

sql-server

pandas

pyodbc