Ineffective Prepared Delete Statement (no replies)

I'm attempting to execute a prepared delete statement like so:

prep_stmt = conn->prepareStatement("DELETE FROM my_table WHERE my_column = ?");

sql::SQLString test_string = "\'asdf\'";

prep_stmt->setString(1, test_string);

int update_count = prep_stmt->executeUpdate();

There appears to be no runtime errors (at least, no exception is thrown). However, update_count is zero, and investigating the contents of the database after execution reveals that the associated data entry was not removed.

Has anyone seen this before?