I have a Record bean. In that I am using an array of different objects. While writing the data into a CSV file I am not able to map that array for the Name property of BeanWrapperFieldExtractor.
How can I map the array of Address in BeanWrapperFieldExtractor? Or is there any alternate way to solve this issue?
Take a look at this old question dealing with files where multiple lines apply to the same record. Basically you would leverage a SingleItemPeekableItemReader, and each parent record would be augmented by the following addresses lines.
Related
I'm new to Matlab and I need some suggestions on how to deal with having many inputs to a function.
The program reads data from multiple elements and stores them in an array, which I'm doing in a loop. The problem is that if I input the wrong information about one element, I must re-input the data all over again. I believe that there must exist a better way to input these data, like reading it from a external file, for example.
The problem with the external file would be, as far as I know, with the reading of multiple arrays from a single file, hence the need of multiple external files - and I believe also that must exist some better way.
As noted by #beaker, you can use save and load to store the data. You can store multiple variables in a given file without a problem.
I need to recursively traverse a very large and complicated object model to search for a particular value of an ID.
The value I'm looking for is in a property called "ID", but objects with a particular ID might have many children, some of which are arrays, each having a different ID, and each of those children in turn can have a different ID and so on and so forth.
So if I give you an object, say $web, and you know that deep down in it's object model there is a value of an object that you are looking for. How do you look for it using recursion and reflection?
Note: This is a generic powershell/recursion/programming question even though the topic is SharePoint.
How about using Format-Custom? For example, getting a lot of nested member data from a directory info is done like so,
(gci)[0] | fc > test.txt
Will give some 8800 lines of data for expanded members.
I am setting a managedObject up from data I am getting off the web, before I add this new object to the managedObjectContext I want to check if its all ready in the database. Is there a way to compare two managed objects in one hit, or do I have to compare each attribute individually to work out if they are identical or one contains a difference?
Simple Example:
Entity:Pet (Created but not inserted into database)
Attribute, Name: Brian
Attribute, Type: Cat
Attribute, Age: 12
Entity:Pet (Currently in database)
Attribute, Name: Brian
Attribute, Type: Cat
Attribute, Age: 7
In this example can I compare [Brian, Cat, 12] with [Brian, Cat, 7] or do I need to go through each attribute one by one to ascertain a full match?
Unique identifiers are often used to search for objects by only having to match the one field. As you note, matching on multiple fields could be annoying and inefficient, but it's perhaps not as bad as you think: you can construct an NSPredicate to quite easily match all the required fields on objects in Core Data.
Use of NSPredicate aside: suppose you just want to match one field. If you don't have a suitable unique identifier in the data as provided, you could derive one. The obvious way is to construct a hash code for everything you store, based on each field you want to match on. Then when you wish to check if an 'incoming' object is already in core data, compute the hash code for the new object, then just look for an object in core data with that same hash code. (Note: if you find an object that already exists with the same hash code, you might want to then compare all the fields to check that it really does represent the same object -- there's a tiny chance it might be a 'different' object, A.K.A. a hash collision).
A very naive hash code implementation for an object X would be something like:
hashcode(X) = hashcode(X.name) + hashcode(X.type) + hashcode(X.age)
To see a more realistic example of writing a hashcode function, see the accepted answer here.
By the way, I'm assuming that you don't want to load all your objects from core data into memory at once. If however that is acceptable (suppose you have quite a limited amount of items), an alternative is to implement isEqual and hash on your class, and then use regular foundation class methods like NSArray indexOfObject: (or, even better, NSDictionary objectForKey:) to locate objects of interest.
I have a set of objects that the user can sort arbitrarily. I would like to make my client remember the sorting of the set of objects so that when the user visits the page again the ordering he/she chose will be preserved. However, the client-side framework should also be able to quickly lookup the objects from whatever array/hashmap they are stored in based upon the ordering. What is the most efficient way of doing this?
The best way I have found for doing this is using an array that stores the IDs of the array in the particular order I wanted. From there, I can access the array of objects I wanted by converting the array to a hashmap using Underscore.js.
I am appending an array of numbers to an existing excel file using this:
dlmwrite(mydatafile,newdataarray,'-append');
I need to add a column to the beginning of the new row for a text identifier (employee name), but I can't get Matlab to write the name to a single cell. Does anyone have any ideas how I'd be able to do this?
Your question is not completely clear, for example it is not completely defined how you can add a column to a row.
If the following does not work I would recommend you to provide a small scale example of the data that you have and the things you want to append.
Assuming you just need to get this done and are not looking for a pretty solution you could try to:
First read it into matlab
Then perform the operation that you like
Then write it to a new file
This will allow you to do pretty much anything but whether it is convenient depends on your specific needs.