OleDbCommand can't excute this command, Why?

Question

I create a table named "PathTable" in a MS-Access DB. The table is like this:

------------------------------
| IP        | Input | Output |
------------------------------
| 127.0.0.1 | XXXXX | YYYYYY |
------------------------------

When I programed these

String CommandString = "SELECT Input, Output FROM PathTable WHERE IP = '127.0.0.1'";

OleDbCommand CommandObj = new OleDbCommand( CommandString, m_Connection );

OleDbDataReader ReaderObj = CommandObj.ExecuteReader();

the code always throw OleDbException, and the ErrorDescription is E_FAIL(0x80004005),

But if I replaced the commandString with

SELECT * FROM PathTable WHERE IP = '127.0.0.1'

The problem never happended again.

So, my question is: Does OleDbCommand only excute "select * "? Thanks.

Answer 1

Maybe these are reserved words. Try quoting them:

SELECT [Input], [Output] FROM PathTable WHERE IP = '127.0.0.1'

Answer 2

I am sending you the list of Microsoft reserved words, Please check, you are using reserved keyword that's why you are facing this problem.

http://support.microsoft.com/kb/321266

Answer 3

It's possible 'input' or 'output' are reserved words in Access SQL so try adding [] square brackets around those field names.

Answer 4

Input and Output may be keywords. Try surrounding them with square brackets. i.e.

[Input] [Output]

Answer 5

File Not Found - Another possible cause of this exception is if the File your trying to load/read does not exist.

I have found it useful to perform a "File.Exists" before trying to open the file just to make sure my code detects this specific cause of the "IErrorInfo.GetDescription failed with E_FAIL(0x80004005)" exception correctly.