Yet Another SQLBindParameter Thread -- Char* As A Parameter? (already Did A Search)

Hi guys, first post here. It's been a few years since I've worked with ODBC, so I'm a bit rusty. I'm having trouble figuring out how to use a char* string as a parameter for a SELECT statement. I'm trying to compare the contents of a varchar column (with size=20) against the string.

Here's the code that I'm using:


char* arg;
SQLINTEGER stringSize = 32;

retcode = SQLBindParameter(hstmt,
1,
SQL_PARAM_INPUT,
SQL_C_CHAR,
SQL_VARCHAR,
20,
0,
arg,
stringSize,
&stringSize);

retcode = SQLPrepare(hstmt,
(SQLCHAR*) "SELECT * "
"FROM myTable "
"WHERE (stringColumn = '?')",
SQL_NTS);

retcode = SQLExecute(hstmt);

retcode = SQLFetch(hstmt);

When SQLFetch() runs, it returns 100 (SQL_NO_DATA). If I type the query manually into my Enterprise Manager console, I get several results, so I know the query is correct. Any idea what I might be doing wrong with the ODBC calls?

Thanks!