Question

我正在使用pyodbc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)")

与供应商交谈后，我得到了这样的答复： 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.

我的代码非常简单，因为我此时只是尝试连接：

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

是否有人将python连接到OSI PI？如果是这样，你是怎么做到的？如果没有，你仍然使用OSI数据库中的数据，你是如何最终访问它的？

Answer 1

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。

实施例

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

注意：

这需要OSISoft提供的PIOLEDB驱动程序安装在运行此代码的计算机上。
这种方法表现并不可怕。我能够用我的其他一些查询撤回数十万条记录，并在可接受的时间内返回

Answer 2

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

如何将Python 2.6连接到OSI PI？

2 个答案: