How to use

scalarValueOrNull

method

in

leap.orm.query.Query

@Override
public Object apply(ActionParams params) {
  Map<String,Object> map = params.toMap();
  Object result;
  if(command.getMetadata().isSelect()) {
    //todo: page query, total count
    Query query = dao.createQuery(command).params(map);
    if(null != returnType) {
      if(returnType.isSimpleType()) {
        result = Converts.convert(query.scalarValueOrNull(), returnType.asSimpleType().getJavaType());
      }else if(returnType.isCollectionType() && returnType.asCollectionType().getElementType().isSimpleType()) {
        result = query.scalars().list(returnType.asCollectionType().getElementType().asSimpleType().getJavaType());
      }else {
        result = query.list();
      }
    }else {
      result = query.list();
    }
  }else{
    //todo: the return type must be simple type
    result = dao.executeUpdate(command, map);
    if(null != returnType) {
      result = Converts.convert(result, returnType.asSimpleType().getJavaType());
    }
  }
  return ApiResponse.of(result);
}