getColumnPrecision (SQLRCursor)

    /**
     *  call-seq:
     *  getColumnPrecision(col)
     *
     *  Returns the precision of the specified column.  Precision is the total
     *  number of digits in a number.  eg: 123.45 has a precision of 5.  For
     *  non-numeric types, it's the number of characters in the string.  "col"
     *  may be specified as the column name or number. */
    static VALUE sqlrcur_getColumnPrecision(VALUE self, VALUE col) {