2

我pyodbc用来管理我的数据库连接。我正在尝试连接到 OSI PI 数据库并收到此错误：

pyodbc.Error: ('IM002', "[IM002] [OSI][PI ODBC][PI]PI-API Error <pilg_getdefserverinfo> 0 (0) (SQLDriverConnectW); [01000] [Microsoft][ODBC Driver Manager] The driver doesn't support the version of ODBC behavior that the application requested (see SQLSetEnvAttr). (0)")

在与供应商交谈后，我得到了以下回复： Looks like pyodbc is written against ODBC 3.x. The OSI PI ODBC driver is using ODBC 2.0. The python ODBC driver manager will convert most ODBC 3 calls on the fly to ODBC 2 ones. Anything added to 3, however, will obviously fail. You would need to find some way to make sure that your only using 2.0 compliant ODBC calls. Currently their is not a PI ODBC driver that is compliant with ODBC 3.0.

我的代码相当简单，因为此时我只是尝试连接：

import pyodbc
constr = 'DRIVER={PI-ODBC};SERVER=myserver;UID=MY_UID'
pyodbc.pooling=False
conn = pyodbc.connect(constr)           # Error at this line
conn.close()

有没有人将 python 连接到 OSI PI？如果是这样，你是怎么做到的？如果不是，并且您仍然使用 OSI 数据库中的数据，您最终是如何访问它的？

4

2 回答 2

3

我想出了如何做到这一点。我不得不改变使用pyodbc。相反，我正在使用win32com执行此操作。

例子

from win32com.client import Dispatch

oConn = Dispatch('ADODB.Connection')
oRS = Dispatch('ADODB.RecordSet')

oConn.ConnectionString = "Provider=PIOLEDB;Data Source=<server>;User ID=<username>;database=<database>;Password=<password>"
oConn.Open()

if oConn.State == 0:
    print "We've connected to the database."
    db_cmd = """SELECT tag FROM pipoint WHERE tag LIKE 'TAG0001%'"""
    oRS.ActiveConnection = oConn
    oRS.Open(db_cmd)
    while not oRS.EOF:
        #print oRS.Fields.Item("tag").Value   # Ability to print by a field name
        print oRS.Fields.Item(0).Value        # Ability to print by a field location
        oRS.MoveNext()
    oRS.Close()
    oRS = None
else:
    print "Not connected"

if oConn.State == 0: 
    oConn.Close()
oConn = None

笔记：

  • 这需要在运行此代码的机器上安装 OSISoft 提供的 PIOLEDB 驱动程序。
  • 这种方法的性能似乎并不可怕。我能够用我的其他一些查询拉回数十万条记录，并在可接受的时间内返回
于 2012-02-01T17:46:59.623 回答
-2

尝试使用这个http://pypi.python.org/pypi/ceODBC/2.0.1

于 2012-01-17T16:38:50.297 回答