mysql dynamic binding for stmt

int _mysql_schema_stmt_bind_params(MYSQL_STMT *stmt, MYSQL_BIND *params, int n,
  const char *typestr, va_list args)
{
  int i;

  memset(params, 0, sizeof(MYSQL_BIND) * n);

  for (i = 0; i < n && *typestr; ++i)
  {
    switch (*typestr++)
    {
    case 'C':
      params[i].is_unsigned = 1;
    case 'c':
      params[i].buffer_type = MYSQL_TYPE_TINY;
      params[i].buffer = va_arg(args, uint8_t*);
      params[i].buffer_length = sizeof(uint8_t);
      break;

    case 'S':
      params[i].is_unsigned = 1;
    case 's':
      params[i].buffer_type = MYSQL_TYPE_SHORT;
      params[i].buffer = va_arg(args, uint8_t*);
      params[i].buffer_length = sizeof(uint8_t);
      break;

    case 'L':
      params[i].is_unsigned = 1;
    case 'l':
      params[i].buffer_type = MYSQL_TYPE_LONG;
      params[i].buffer = va_arg(args, uint32_t*);
      params[i].buffer_length = sizeof(uint32_t);
      break;

    case 'Q':
      params[i].is_unsigned = 1;
    case 'q':
      params[i].buffer_type = MYSQL_TYPE_LONGLONG;
      params[i].buffer = va_arg(args, uint64_t*);
      params[i].buffer_length = sizeof(uint64_t);
      break;

    case 'f':
      params[i].buffer_type = MYSQL_TYPE_FLOAT;
      params[i].buffer = va_arg(args, float*);
      params[i].buffer_length = sizeof(float);
      break;

    case 'd':
      params[i].buffer_type = MYSQL_TYPE_DOUBLE;
      params[i].buffer = va_arg(args, double*);
      params[i].buffer_length = sizeof(double);
      break;

    case 'A':
      params[i].buffer_type = MYSQL_TYPE_STRING;
      params[i].buffer_length = va_arg(args, size_t);
      params[i].buffer = va_arg(args, char*);
        break;

    case 'a':
      params[i].buffer_type = MYSQL_TYPE_STRING;
      params[i].buffer = va_arg(args, char*);
      params[i].buffer_length = strlen(params[i].buffer);
      break;

    case 'x':
      params[i].buffer_type = MYSQL_TYPE_NULL;
      break;

    default:
      return 0;
    }
  }

  if (!mysql_stmt_bind_param(stmt, params))
    return 0;

  return 1;
}