well, Usually I create a ByteArrayOutputStream, and initilize an ObjectOutputStream with it, then i write out the object (ObjectOutputStream.writeObject(Object o)) I want to convert in bytes and initilize an NSData with them (new NSData(ObjectOutputStream.toByteArray()) ).
To read from the DB, I made the inverse: ByteArrayInputStream -> ObjectInputStream.readObject(), and get the object i've written before. Remember Method to get NSData is public, no arguments, method to convert to the object is public static one argument NSdata. Have a look to Java API http://java.sun.com/j2se/1.4.2/docs/api/java/io/ObjectOutputStream.html, http://java.sun.com/j2se/1.4.2/docs/api/java/io/ObjectInputStream.html 2008/4/18 Jeff Schmitz <[EMAIL PROTECTED]>: > I received one suggestion to define a serializable class to contain the > array and then serialize the array objects to the NSData/BLOB type, instead > of ERXMutableArray. I may give that a try. Is that a viable approach? > Any examples out there of doing this? > > Thanks, > Jeff > > > On Apr 18, 2008, at 1:26 AM, Denis Frolov wrote: > > Hi, > > > > I had a similar problem with MySQL (mysql-connector-java-5.0.4-bin.jar > > is the latest one I've tried) and mutableDictionary. There were two > > solutions that worked for me: > > > > 1. Change externalType to TEXT in model while leaving BLOB in the > > database (i.e. generate sql with TEXT and change type to BLOB after > > that). > > 2. Modify generator templates to have something like: > > > > public er.extensions.ERXMutableDictionary uploadsFileNames() { > > try { > > return (er.extensions.ERXMutableDictionary) > > storedValueForKey("uploadsFileNames"); > > } catch (ClassCastException e) { > > return (ERXMutableDictionary) > > ERXMutableDictionary.fromBlob((NSData) > > storedValueForKey("uploadsFileNames")); > > } > > } > > > > Both solutions are really dirty and can lead to unwanted side effects, > > so I've decided that it really doesn't worth the effort and refactored > > my model not to use these prototypes at all. > > > > You might also want to check this thread: > > > > http://www.wodeveloper.com/omniLists/webobjects-dev/2004/March/msg00340.html > > > > On Thu, Apr 17, 2008 at 3:20 PM, Jeff Schmitz <[EMAIL PROTECTED]> > > wrote: > > > > > Hello, > > > > > > I've taken Dave's SooperSeekrit Screencast project as a starting point > > > to > > > start playing with EO objects using the Wonder Framework. > > > > > > Using Entity Modeler (with Frontbase prototypes), I've added an > > > ERXMutableArray to one of my classes that I want to use as an array of > > > Boolean's in my code. In this case, what do I need to put as the > > > Value > > > Type? Also, for the width, will it be 4 bytes X the max number of > > > Booleans > > > to be stored? > > > > > > > > > > > > I have tried just leaving these fields blank. > > > > > > > > > Then using the following code, I'm able to create a User object ok, > > > and it > > > shows up in my database with the Boolean array as a Blob: > > > > > > > > > Group group = Group.fetchRequiredGroup(ec, "name", "user"); > > > Boolean [] bools = {true, false, true}; > > > ERXMutableArray boolArray = new ERXMutableArray(bools); > > > User.createUser(ec, boolArray, first, last, password, newuser, > > > group); > > > ec.saveChanges(); > > > > > > However, when I try to a fetch from the DirectAction class as follows: > > > > > > > > > EOQualifier qual = > > > User.USERNAME.eq(username).and(User.PASSWORD.eq(password)); > > > User user = User.fetchRequiredUser(ERXEC.newEditingContext(), qual); > > > > > > > > > I get the following exception on the User.fetchRequiredUser line: > > > > > > > > > Apr 16 22:31:32 SooperSeekrit[49595] > > > (ERXDatabaseContextDelegate.java:105) > > > INFO er.transaction.adaptor.Exceptions - Database Exception occured: > > > java.lang.ClassCastException: er.extensions.ERXMutableArray > > > > > > I'm guessing it has to do with the missing fields? > > > > > > Thanks, > > > Jeff > > > _______________________________________________ > > > Do not post admin requests to the list. They will be ignored. > > > Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) > > > Help/Unsubscribe/Update your Subscription: > > > > > > http://lists.apple.com/mailman/options/webobjects-dev/dfrolov%40demax.ru > > > > > > This email sent to [EMAIL PROTECTED] > > > > > > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/webobjects-dev/ildenae%40gmail.com > > This email sent to [EMAIL PROTECTED] > Hope this Help -- Daniele Corti AIM: S0CR4TE5 Messenger: [EMAIL PROTECTED] -- Computers are like air conditioners -- they stop working properly if you open WINDOWS -- What about the four lusers of the apocalypse? I nominate: "advertising", "can't log in", "power switch" and "what backup?" --Alistair Young
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