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Microsoft KB Archive/104958

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Knowledge Base


BUG: Oracle Driver Errors on Delimited Column Names

Article ID: 104958

Article Last Modified on 7/27/2001



APPLIES TO

  • Microsoft Open Database Connectivity 1.0



This article was previously published under Q104958

BUG# ODBCORA: 572 (1.002816)

SYMPTOMS

The Oracle ODBC Driver gives an error on any SELECT statement that contains an outer join (in the ODBC escape-clause syntax) on a delimited column name that is greater than 17 characters. As a result, when using Microsoft Access or Microsoft Visual Basic to connect to an Oracle server, you cannot perform outer joins on columns whose names are longer than 17 characters.

So, the following query:

SELECT * FROM {oj table1 LEFT OUTER JOIN table2 ON
   (table1.abcdefghijklmnopq = table2.col1)}
                

works fine; note that the delimited column name (abcdefghijklmnopq) is 17 chars long. However, the following query:

SELECT * FROM {oj table1 LEFT OUTER JOIN table2 ON
   (table1.abcdefghijklmnopqr = table2.col1)}
                

gives the error:

MsgId: Unknown String Resource.

The above error appears in a dialog box with an OK button. Choosing OK will cause SQLExecDirect or SQLExecute to return SQL_ERROR. The SQL_ERROR states:

szSqlState = "37000"
[PageAhead][ODBC Oracle Driver]Syntax Error

While working with an ODBC Data source, the Access Engine uses delimited identifiers for all its queries; it also uses canonical outer join syntax for performing outer joins. Thus, when an Access or Visual Basic user does an outer join on Oracle tables, the above mentioned error occurs if any of the columns participating in the outer join have a name longer than 17 characters.

WORKAROUND

Rename the column so that it has less than 17 characters.

STATUS

Microsoft has confirmed this to be a problem in ODBC Oracle Driver versions 1.00.2816 and 1.00.3112. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.


Additional query words: 1.00.2816 1.00.3112 VB

Keywords: kbbug KB104958