dataset

问题 I have a nested list and I need to convert it to DataSet in C#. I found many example about this but they dont do what I need. I have a list in a list, I need the nested list in another DataTable in the DataSet. Here is an example of list public class InvoiceResponse(){ public string BillToName { get; set; } public string BillToAddr1 { get; set; } ... ... public List<InvoiceItemResponse> Items { get; set; } } I have used the code below to convert the List to DataSet but It didnt convert Items

问题 I have a dataset (Purchase.df) that contains many columns and rows. The important variable names for this question are "Customer", "OrderDate", "DateRank" (which ranks the dates so I can find the smallest date) and "BrandName." Below is a very small sample of what I'm working with: (I'm new to this website, so I hope what I paste below works) Purchase.df<-structure(list(Customer = c(10071535L, 10071535L, 10071535L, 10071535L, 10071535L, 10071535L, 10071711L, 10071711L, 10071711L, 10071711L,

问题 I want the result set of a database query to have a certain order. The information I want to order by is not contained in the database, but dynamically generated in code (so I cannot use ORDER BY ). Is there a way to sort a dataset after executing the database query? (I don't need indexed access but only want to iterate over all records.) 回答1: There is a possibility that shares similarities with Jens' answer (+1) but gets to the result in a slightly different fashion. Given an existing table:

问题 First I have to say, that I am a newby using LINQ. Actually I never used before, but I am having a task where I need to filter a DataTable, using values that will come from a List. So I will like to know if it's possible in LINQ to query on a Datatable using values in the List as Filter values. Some one can give me some hint's Thank you. 回答1: The best way to do this depends on what you plan to do with the filtered results. Do you need the results back as DataTable for further operations, or

问题 Suppose I have a dataset with those two immortal tables: Employee & Order Emp -> ID, Name Ord -> Something, Anotherthing, EmpID And relation Rel : Ord (EmpID) -> Emp (ID) It works great in standard master/detail scenario (show employees, follow down the relation, show related orders), but what when I wan't to go the opposite way (show Ord table with Emp.Name)? Something like this: <stackpanel> // with datacontext set from code to dataset.tables["ord"] <TextBox Text="{Binding Something}"/>

问题 This question already has an answer here : DataFrame / Dataset groupBy behaviour/optimization (1 answer) Closed last year . I know that in RDD's we were discouraged from using groupByKey, and encouraged to use alternatives such as reduceByKey(), and aggregateByKey() since these other methods would reduce first on each partition, and then perform groupByKey() and thus reduces the amount of data being shuffled. Now, my question is if this still applies to Dataset/Dataframe? I was thinking that

问题 I'm trying to replicate northwind database but when I created parameter query vw_CustomerOrderYear , the query is not showing in my datasource. I do not know what I'm missing.. My parameter query vw_CustomerOrderYear is : PARAMETERS OrderYear Long; SELECT DISTINCT Customer.ID, Customer.Name, Customer.City, Customer.Country, Year([Order].OrderDate) AS OrderYear FROM Customer INNER JOIN [Order] ON Customer.ID=Order.CustomerId WHERE (((Year(Order.OrderDate))=[OrderYear])) Or ((([OrderYear]) Is

问题 I'd like to replace all values in my relatively large R dataset which take values above the 95th and below the 5th percentile, with those percentile values respectively. My aim is to avoid simply cropping these outliers from the data entirely. Any advice would be much appreciated, I can't find any information on how to do this anywhere else. 回答1: This would do it. fun <- function(x){ quantiles <- quantile( x, c(.05, .95 ) ) x[ x < quantiles[1] ] <- quantiles[1] x[ x > quantiles[2] ] <-

问题 I have two TDBLookupComboBox controls that I'd like to connect to the same dataset, but have each one display a different subset of the data. If I only needed one box, I'd use filtering on the dataset, but I need to be able to display both of them at the same time, and I'm not aware of any way to do that. Does anyone know if it can be done, and if so, how? 回答1: If you're using a TClientDataSet, you can clone the cursor (TClientDataSet.CloneCursor) into another TClientDataSet that doesn't have

问题 Is there any way to change the DataSet default node name? I am creating XML from a DataTable . This is my code: DataSet dataSet = new DataSet("Products"); dataSet.Tables.Add(tbl); dataSet.WriteXml(@"D:\Temp\test.xml"); This is the XML I'm getting: <Products> <Table1> <product_name>McWilliams Hanwood Chardonnay 750mL</product_name> <id>121385</id> <price>7.60</price> </Table1> <Table1> ... </Table1> <Table1> ... </Table1> </Products> Is there a way to change Table1 to Product like: <Products>