This relates to column oriented databases versus row oriented. Your first example is a row oriented data structure, and the second is column oriented. In the particular case of Python, the first could be made notably more efficient using slots, such that the dictionary of columns doesn’t need to be duplicated for every row. Which … Read more
ds.Tables[4] might, but the result of your linq-query might not, which is likely where the exception is being thrown. Split your method chaining to use interim parameters so you can be dead certain where the error is occurring. It’ll also help you check for existing rows before you call CopyToDataTable() and avoid said exception. Something … Read more
As far as I know, from the stored proc, you can’t do that. You can, however, set the names once you have retrieved the DataSet, and then use them from then on. ds.Tables[0].TableName = “NametbA”;
string result = null; using (TextWriter sw = new StringWriter()) { dataSet.WriteXml(sw); result = sw.ToString(); }
I have released a python package “pyreadstat” that reads SPSS (sav, zsav and por), Stata and SAS files. It is a wrapper around the C library ReadStat so it is very fast. Readstat is the library used in the back of the R library Haven, which is widely used and very robust. The package is … Read more
foreach (DataTable table in dataSet.Tables) { foreach (DataRow row in table.Rows) { foreach (object item in row.ItemArray) { // read item } } } Or, if you need the column info: foreach (DataTable table in dataSet.Tables) { foreach (DataRow row in table.Rows) { foreach (DataColumn column in table.Columns) { object item = row[column]; // read … Read more
While the class holding the extensions is in the System.Data namespace, it’s located in an assembly that isn’t added to your project by default. Add a reference to System.Data.DataSetExtensions to your project and it should be ok. Remember that, even after you’ve added the reference, any class that expects to use the extension methods defined … Read more
DataRow’s are nice in the way that they have their underlying table linked to them. With the underlying table you can verify that a specific row has a specific column in it. If DataRow.Table.Columns.Contains(“column”) Then MsgBox(“YAY”) End If
Try PIL.Image.MAX_IMAGE_PIXELS = 933120000 How to find out such a thing? import PIL print(PIL.__file__) # prints, e. g., /usr/lib/python3/dist-packages/PIL/__init__.py Then cd /usr/lib/python3/dist-packages/PIL grep -r -A 2 ‘exceeds limit’ . prints ./Image.py: “Image size (%d pixels) exceeds limit of %d pixels, ” ./Image.py- “could be decompression bomb DOS attack.” % ./Image.py- (pixels, MAX_IMAGE_PIXELS), Then grep -r … Read more