Thanks Mariano, Sven
2015-09-28 16:42 GMT+02:00 Sven Van Caekenberghe <s...@stfx.eu>: > > > On 28 Sep 2015, at 15:04, Mariano Martinez Peck <marianop...@gmail.com> > wrote: > > > > Imagine something like this: > > > > neoCSVReader := (NeoCSVReader on: stream). > > neoCSVReader > > separator: $,; > > recordClass: PriceRecord; > > addIgnoredField; "<name>" > > addField: #securityUniqueId: ; "<ticker>" > > addField: #date: converter: [ :string | Date readFrom: > string readStream pattern: 'yyyymmdd' ]; "<date>" > > addFloatField: #open: ; "<open>" > > addFloatField: #high: ; "<high>" > > addFloatField: #low: ; "<low>" > > addFloatField: #close: ; "<close>" > > addIntegerField: #volume: . "<vol>" > > neoCSVReader skipHeader. > > priceRecords := neoCSVReader upToEnd. > > > > > > The #recordClass: is optional. If not, you can get an array of arrays > instead. > > You can add #addIgnoredField for all the ones you want to ignore, then > add the #addNumber: etc for the number ones, etc. > > Correct. > But I have to call addIgnoredField ~ 25 times. I hope there were a way to specifiy column index and field descirption only for those columns I am interested in. > > > To write a default empty value, I would use my own converter. Something > like: > > > > addField: #stringcolumn: converter: [ :string | string isEmptyOrNil > ifTrue: [ '' ] ]; > > addField: #numbercolumn: converter: [ :string | string isEmptyOrNil > ifTrue: [ 0 ] ifFalse: [ NeoNumberParser parse: string ] ]; > Yes this helps > > Actually there is NeoCSVReader>>#emptyFieldValue: which you can use the > configure the reader (but it counts for all fields). > > > > Hope this helps. > > > > > Cheers, > > > > > > > > On Mon, Sep 28, 2015 at 9:06 AM, Nicolai Hess <nicolaih...@web.de> > wrote: > > Hi, > > > > I have two problems I could not solve: > > > > 1. I would like to read only some columns: I have a large file with > > ~30 colums, but I am only interested on ~5 columns > > (not that important, I could pre-process the file) but anyway it > would be > > nice to do it in smalltalk. > > > > 2. some columns will contain only strings (quoted values) and some only > numbers, > > but the field may be empty, is it possible to define the default > "emptyValue" as an > > - empty string for empty fields in the "string column" > > - 0 for empty fields in the "number column"? > > > > > > thanks > > in advance > > > > nicolai > > > > > > > > -- > > Mariano > > http://marianopeck.wordpress.com > >
