datatable

问题 I have a windows application where on the click of a button it fetches data from a Oracle query and when binding the gridview datasource to a datatable it takes almost 5 mins to load for 3500 records . The final gridview looks like this which is again dependent on data in the down form .on the click of any row in the first grid the second grid data should also change but now it takes huge time and seems like it is kind of doing any background task which am unable to get as am pretty new to

问题 I have a windows application where on the click of a button it fetches data from a Oracle query and when binding the gridview datasource to a datatable it takes almost 5 mins to load for 3500 records . The final gridview looks like this which is again dependent on data in the down form .on the click of any row in the first grid the second grid data should also change but now it takes huge time and seems like it is kind of doing any background task which am unable to get as am pretty new to

问题 I am trying to make all columns in the datatable the same width align the datatable (both header and its content) to the left enable horizontal scrolling once it reaches mainPanel width but my datatable gets automatically centered to the mainPanel, its header and content are also misaligned. Example: library(shiny) library(dplyr) library(DT) ui <- fluidPage( titlePanel("Test Example"), mainPanel( width = 10, dataTableOutput("cars.table") ) ) server <- function(input, output) { output$cars

问题 UPDATED: An example of the problem is shown below the code for the app I'm building an dynamic ML app where the user can upload a dataset to get a prediction of the first column in the dataset (the response variable should be located in column 1 of the uploaded dataset). The user can select a value for the variables in the uploaded dataset and get a prediction of the response variable. I'm currently trying to create a datatable that stores all the selected values, timestamp and the prediction

问题 I would like to separate a table's coulombs to correspond with the number and data of the string I would like to load into the table. Otherwise said, if I have a 2x1 string, I would like to have a table in which the information from the two different rows remain separate ( But for a nx1 string ). Here is my example and attempt of doing it: String = ["Random info in middle one, "+ ... "Random info still continues. ", "Random info in middle two. "+ ... "Random info still continues. "];

问题 I'm trying to create a DataGridView bound to a DataTable where one column is a ComboBox. The code runs but I get the following error after binding (not when data is bound): System.ArgumentException: DataGridViewComboBoxCell value is not valid. In the DataGridView one of the columns is a DataGridViewComboBoxColumn that uses an enum (named structureType) as it's source: // ColumnStructure // this.ColumnStructure.ValueType = typeof(structureType); this.ColumnStructure.DataSource = Enum.GetValues

问题 Let say I have below data-table - library(DT) d = data.frame( names = rownames(mtcars), date = as.Date('2015-03-23') + 1:32, time = as.POSIXct('2015-03-23 12:00:00', tz = 'UTC') + (1:32) * 5000, stringsAsFactors = FALSE ) datatable(d, filter = 'bottom', options = list(pageLength = 5)) Now I want to create a new column in the data-table by combining date+time+some-other-string as date_time . This new column date_time should be sortable based only on date part (not the time part nor string part

问题 Trying to download Datatables, able to get 0 or 1 values for checkboxes (for one of the column fields "Verified") initially, but when I am toggling the checkbox and exporting as excel, unable to retrieve the latest check box values. Initially I only had the second checkbox as not ticked in the database so its correctly exporting its values as 0 in the excel sheet but when I change the values and export it again its not taking the updated latest values as you can see in the snapshot attached

问题 In the following code, I noticed that Columns A and B show data. However, columns C and D are empty. Why? DataTable _dt = new DataTable(); DataColumn A=_dt.Columns.Add("A"); DataColumn B=_dt.Columns.Add("B"); DataColumn C=_dt.Columns.Add("C",typeof(String),"A+B"); DataColumn D=_dt.Columns.Add("D",typeof(String),"A+'!'+B"); DataRow _dr=_dt.NewRow(); _dr["A"]="A"; _dr["B"]="B"; Console.WriteLine(_dr["A"]); Console.WriteLine(_dr["B"]); Console.WriteLine(_dr["C"]); //Shows blank-why? Expected AB

问题 I have tried few codes from my end to insert a DataTable inside a Access db. Below is the code: public void WriteToAccess(DataTable dt) { string strDSN = "DSN=MYDSN"; string cmdText="Insert into AccessTable (ColumnA,ColumnB,ColumnC,ColumnD,ColumnE,ColumnF,ColumnG,ColumnH) Values (@p1,@p2,@p3,@p4,@p5,@p6,@p7,@p8)"; using (OdbcConnection cn = new OdbcConnection(strDSN)) { using (OdbcCommand cmd = new OdbcCommand(cmdText, cn)) { cn.Open(); foreach (DataRow r in dt.Rows) { cmd.Parameters