Avoid using bind_param with SQL_DECIMAL - Aster Client

When using the bind_param method call with decimal fields, you should not explicitly specify SQL_DECIMAL as the parameter bind type. If you do this, and the parameter value has a fractional digital part, the factional part changes to 0 after applying bind_param. The DBD::ODBC bind_param implementation makes this conversion when specifying SQL_DECIMAL/SQL_NUMERIC as the parameter bind type. Note that bind_param works fine when SQL_DECIMAL is not explicitly specified, so you should avoid this when passing decimal fields.