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SQLDescribeCol() returns SQLWCHAR for char datatype with Oracle ODBC driver.

Information

 
TitleSQLDescribeCol() returns SQLWCHAR for char datatype with Oracle ODBC driver.
URL NameSQLColDescribe-returns-SQLWCHAR-for-char-datatype-with-Oracle-ODBC-driver
Article Number000185186
EnvironmentProduct : Connect for ODBC Oracle Wire Protocol driver
Version : All supported versions
Database : Oracle
OS : All supported platforms
Application : All supported applications
Question/Problem Description
SQLDescribeCol returns SQL_WCHAR instead of SQL_CHAR for a CHAR datatype against an Oracle Unicode database.
Steps to Reproduce-Connect using ODBCTest
-SQLExecDirect : create table char_table (col1 char(10))
-SQLExecDirect : select * from char_table
-Results > SQLDecribeCol > OK
This will return SQL_WCHAR instead of SQL_CHAR
Clarifying Information
Error Message
Defect Number
Enhancement Number
Cause
The driver is behaving as designed.
Resolution

If EnableNcharSupport is set to 1, the driver describes normal char types to data types SQL_CHAR, SQL_LONGVARCHAR, and SQL_VARCHAR, and Nchar types to SQL_WCHAR, SQL_WLONGVARCHAR, and SQL_WVARCHAR.
If EnableNcharSupport is set to 0, all char types are mapped to SQL_WCHAR, SQL_WVARCHAR, and SQL_WLONGVARCHAR if database is Unicode.

So if database is Unicode & EnableNCharSupport=0, then all char types are mapped to SQL_W* types.

Workaround
Notes
Last Modified Date8/1/2016 3:05 PM
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