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  • Inverse Factorial Function (Prolog)

    - by user2796815
    I have to write a Prolog program to computer the inverse of factorial function without using division. I was also given the note: "the inverse of a function is not necessarily a function". I have this is a normal factorial predicate.. fact(0,1). fact(N,F) :- N0, N1 is N-1, fact(N1,F1), F is N * F1. I've read on some other posts that you should be able to just switch around the arguments, but that doesn't seem to be the case with this version. Could anyone help me out with figuring out why?

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  • Core Data: Multiple conditions inside relational aggregate operations

    - by Uzaak
    I have an SQLite table used by Core Data with the following elements: Name: John LastName: Foobar Age: 23 Name: Bob LastName: Baz Age: 37 Name: Peter LastName: Fooqux Age: 32 Name: John LastName: Bar Age: 29 Those are all in a to-many relationship from another object "Company". I need to query the database and retrieve all Company objects with employees called "John" but whose last name does NOT contain "Foo". I did go as far as to make the following predicate: [NSPredicate predicateWithFormat:@"ANY employee.name = 'John'"]; How do I get to filter only by companies whose Johns don't have "Foo" in their last names?

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  • VB to C# conversion incongruency with lambdas

    - by Jason
    I have a bit of code that I have been tasked with converting to C# from VB. A snippet of mine seems like it cannot be converted from one to the other, and if so, I just don't know how to do it and am getting a little frustrated. Here's some background: OrderForm is an abstract class, inherited by Invoice (and also PurchaseOrder). The following VB snippet works correctly: Dim Invs As List(Of OrderForm) = GetForms(theOrder.OrderID) .... Dim inv As Invoice = Invs.Find( Function(someInv As Invoice) thePO.SubPONumber = someInv.SubInvoiceNumber) In C#, the best I came to converting this is: List<OrderForm> Invs = GetForms(theOrder.OrderID); .... Invoice inv = Invs.Find( (Invoice someInv) => thePO.SubPONumber == someInv.SubInvoiceNumber); However, I get the following error when I do this: Cannot convert lambda expression to delegate type 'System.Predicate' because the parameter types do not match the delegate parameter types Is there any way to fix this without restructuring my whole codebase?

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  • Core Data: Fetch all entities in a to-many-relationship of a particular object?

    - by Björn Marschollek
    Hi there, in my iPhone application I am using simple Core Data Model with two entities (Item and Property): Item name properties Property name value item Item has one attribute (name) and one one-to-many-relationship (properties). Its inverse relationship is item. Property has two attributes the according inverse relationship. Now I want to show my data in table views on two levels. The first one lists all items; when one row is selected, a new UITableViewController is pushed onto my UINavigationController's stack. The new UITableView is supposed to show all properties (i.e. their names) of the selected item. To achieve this, I use a NSFetchedResultsController stored in an instance variable. On the first level, everything works fine when setting up the NSFetchedResultsController like this: -(NSFetchedResultsController *) fetchedResultsController { if (fetchedResultsController) return fetchedResultsController; // goal: tell the FRC to fetch all item objects. NSFetchRequest *fetch = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"Item" inManagedObjectContext:self.moContext]; [fetch setEntity:entity]; NSSortDescriptor *sort = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES]; [fetch setSortDescriptors:[NSArray arrayWithObject:sort]]; [fetch setFetchBatchSize:10]; NSFetchedResultsController *frController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetch managedObjectContext:self.moContext sectionNameKeyPath:nil cacheName:@"cache"]; self.fetchedResultsController = frController; fetchedResultsController.delegate = self; [sort release]; [frController release]; [fetch release]; return fetchedResultsController; } However, on the second-level UITableView, I seem to do something wrong. I implemented the fetchedresultsController in a similar way: -(NSFetchedResultsController *) fetchedResultsController { if (fetchedResultsController) return fetchedResultsController; // goal: tell the FRC to fetch all property objects that belong to the previously selected item NSFetchRequest *fetch = [[NSFetchRequest alloc] init]; // fetch all Property entities. NSEntityDescription *entity = [NSEntityDescription entityForName:@"Property" inManagedObjectContext:self.moContext]; [fetch setEntity:entity]; // limit to those entities that belong to the particular item NSPredicate *predicate = [NSPredicate predicateWithFormat:[NSString stringWithFormat:@"item.name like '%@'",self.item.name]]; [fetch setPredicate:predicate]; // sort it. Boring. NSSortDescriptor *sort = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES]; [fetch setSortDescriptors:[NSArray arrayWithObject:sort]]; NSError *error = nil; NSLog(@"%d entities found.",[self.moContext countForFetchRequest:fetch error:&error]); // logs "3 entities found."; I added those properties before. See below for my saving "problem". if (error) NSLog("%@",error); // no error, thus nothing logged. [fetch setFetchBatchSize:20]; NSFetchedResultsController *frController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetch managedObjectContext:self.moContext sectionNameKeyPath:nil cacheName:@"cache"]; self.fetchedResultsController = frController; fetchedResultsController.delegate = self; [sort release]; [frController release]; [fetch release]; return fetchedResultsController; } Now it's getting weird. The above NSLog statement returns me the correct number of properties for the selected item. However, the UITableViewDelegate method tells me that there are no properties: -(NSInteger) tableView:(UITableView *)table numberOfRowsInSection:(NSInteger)section { id <NSFetchedResultsSectionInfo> sectionInfo = [[self.fetchedResultsController sections] objectAtIndex:section]; NSLog(@"Found %d properties for item \"%@\". Should have found %d.",[sectionInfo numberOfObjects], self.item.name, [self.item.properties count]); // logs "Found 0 properties for item "item". Should have found 3." return [sectionInfo numberOfObjects]; } The same implementation works fine on the first level. It's getting even weirder. I implemented some kind of UI to add properties. I create a new Property instance via Property *p = [NSEntityDescription insertNewObjectForEntityForName:@"Property" inManagedObjectContext:self.moContext];, set up the relationships and call [self.moContext save:&error]. This seems to work, as error is still nil and the object gets saved (I can see the number of properties when logging the Item instance, see above). However, the delegate methods are not fired. This seems to me due to the possibly messed up fetchRequest(Controller). Any ideas? Did I mess up the second fetch request? Is this the right way to fetch all entities in a to-many-relationship for a particular instance at all?

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  • C# Entity Framework Base Repository

    - by Andy
    I'm trying to create a base repository for use with Entity Framework 4.0 and having some trouble. In this code below, why is it not possible to do this in one line? public IEnumerable<T> GetAll<T>(Expression<Func<T, bool>> filter) { IEnumerable<T> allCustomers = this.GetAll<T>(); IEnumerable<T> result = allCustomers.Where(filter.Compile()); return result; } Won't this result in 2 SQL statements: one without a where clause that retrieves all rows, and one with a where clause that only retrieves the rows that match the predicate? How can this be done with a single SQL statement? I can't get it to compile if I try to cast the filter.Compile() to Func<Customer, bool>. Thanks, Andy

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  • NSArrayController that is sorted and unique (no duplicates) for use in a pop-up in a core-data app

    - by Douglas Weaver
    I have core data app with an entity OBSERVATION that has as one of its attributes DEALNAME. I want to reference through Interface Builder or by making custom modifications to an NSArrayController a list of unique sorted dealnames so that I can use them in a pop-up. I have attempted to use @distinctUnionOfSets (and @distinctUnionOfArrays) but am unable to locate the proper key sequence. I can sort the ArrayController by providing a sort descriptor, but do not know how to eliminate duplicates. Are the @distinct... keys the right methodology? It would seem to provide the easiest way to optimize the use of IB. Is there a predicate form for removing duplicates? Or do I need to use my custom controller to extract an NSSet of the specific dealnames, put them back in an array and sort it and reference the custom array from IB? Any help would be appreciated. I am astounded that other have not tried to create a sorted-unique pop-up in tableviews.

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  • AutoMapper and Linq expression.

    - by Raffaeu
    I am exposing the Dto generated from AutoMapper to my WCF services. I would like to offer something like that from WCF: IList GetPersonByQuery(Expression predicate); Unfortunately I need back an expression tree of Person as my DAL doesn't know the DTO. I am trying this wihtout success: var func = new Func<Person, bool>(x => x.FirstName.Contains("John")); var funcDto = Mapper.Map<Func<Person, bool>, Func<PersonDto, bool>>(func); Console.WriteLine(func.ToString()); Console.WriteLine(funcDto.ToString()); THe error that I get is: ----> System.ArgumentException : Type 'System.Func`2[TestAutoMapper.PersonDto,System.Boolean]' does not have a default constructor Do you have any suggestions?

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  • Collectable<T> serialization, Root Namespaces on T in .xml files.

    - by Stacey
    I have a Repository Class with the following method... public T Single<T>(Predicate<T> expression) { using (var list = (Models.Collectable<T>)System.Xml.Serializer.Deserialize(typeof(Models.Collectable<T>), FileName)) { return list.Find(expression); } } Where Collectable is defined.. [Serializable] public class Collectable<T> : List<T>, IDisposable { public Collectable() { } public void Dispose() { } } And an Item that uses it is defined.. [Serializable] [System.Xml.Serialization.XmlRoot("Titles")] public partial class Titles : Collectable<Title> { } The problem is when I call the method, it expects "Collectable" to be the XmlRoot, but the XmlRoot is "Titles" (all of object Title). I have several classes that are collected in .xml files like this, but it seems pointless to rewrite the basic methods for loading each up when the generic accessors do it - but how can I enforce the proper root name for each file without hard coding methods for each one? The [System.Xml.Serialization.XmlRoot] seems to be ignored.

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  • Core Data NSFetchedResultsController sorting in certain sequence

    - by Moze
    I'm writing iphone app that has UITableView and uses Core Data. Data in UITableView is shown using NSFetchedResultsController. I use NSPredicate operator "IN" to fetch only needed entries. NSArray *filterArray = [NSArray arrayWithObjects:@"789", @"963", @"445", @"198", nil]; NSPredicate *predicate = [NSPredicate predicateWithFormat:@"id IN %@", filterArray]; Now the problem is that I need to show entries in same sequence they are in filterArray. How can I do it? How I can create NSSortDescriptor that would sort all entries in that way? I tried without sort descriptor, but I get error that NSFetchedResultsController needs sortDescriptor to be set.

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  • sql boolean truth test: zero OR null

    - by AK
    Is there way to test for both 0 and NULL with one equality operator? I realize I could do this: WHERE field = 0 OR field IS NULL But my life would be a hundred times easier if this would work: WHERE field IN (0, NULL) (btw, why doesn't that work?) I've also read about converting NULL to 0 in the SELECT statement (with COALESCE). The framework I'm using would also make this unpleasant. Realize this is oddly specific, but is there any way to test for 0 and NULL with one WHERE predicate?

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  • Yet Another Simple Retain Count Question

    - by yar
    [I'm sure this is not odd at all, but I need just a bit of help] I have two retain properties @property (nonatomic, retain) NSArray *listContent; @property (nonatomic, retain) NSArray *filteredListContent; and in the viewDidLoad method I set the second equal to the first self.filteredListContent = self.listContent; and then on every search I do this self.filteredListContent = [listContent filteredArrayUsingPredicate:predicate]; I thought I should do a release right above this assignment -- since the property should cause an extra retain, right? -- but that causes the program to explode the second time I run the search method. The retain counts (without the extra release) are 2 the first time I come into the search method, and 1 each subsequent time (which is what I expected). Some guidance would help, thanks! Is it correct to not release?

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  • Does any method exist quickly to detect valid range versions of used library

    - by daneel-yaitskov
    I'm a beginner Haskell programmer. I have written some useful code for the last six month. And I want to release a library from it. The code will use system installation cabal as any Haskell library. A library is released with cabal has a meta data file where there is a logical predicate from the libraries and their versions. A developer usually uses one set libraries. It tediously care a set of the sets libraries. How to know either my library is compiled successfully or not for some subset libraries?

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  • C++ shifting bits

    - by Bobby
    I am new to shifting bits, but I am trying to debug the following snippet: if (!(strcmp(arr[i].GetValType(), "f64"))) { dem_content_buff[BytFldPos] = tmp_data; dem_content_buff[BytFldPos + 1] = tmp_data >> 8; dem_content_buff[BytFldPos + 2] = tmp_data >> 16; dem_content_buff[BytFldPos + 3] = tmp_data >> 24; dem_content_buff[BytFldPos + 4] = tmp_data >> 32; dem_content_buff[BytFldPos + 5] = tmp_data >> 40; dem_content_buff[BytFldPos + 6] = tmp_data >> 48; dem_content_buff[BytFldPos + 7] = tmp_data >> 56; } I am getting a warning saying the lines with "32" to "56" have a shift count that is too large. The "f64" in the predicate just means that the data should be 64bit data. How should this be done?

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  • Entity Framework 5 upgrade from 4

    - by user1714591
    I'm having an issue with the Where clause in a search, in my original version EF4 I could add a Where clause with 2 parameters, the where clause (string predicate) and a ObjectParameter list such as var query = context.entities.Where(WhereClause.ToString(), Params.ToArray()); since my upgrade to EF5 I don't seem to have that option am I missing something? This was originally used to build dynamic where clause such as "it.entity_id = @entity_id" then holding the variable value in the ObjectParameter. I'm hoping I don't have to rewrite all the searches that have been built out this way, so any assistance would be greatly appreciated. Cheers

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  • What is the role of `while`-loops in computation expressions in F#?

    - by MizardX
    If you define a While method of the builder-object, you can use while-loops in your computation expressions. The signature of the While method is: member b.While (predicate:unit->bool, body:M<'a>) : M<'a> For comparison, the signature of the For method is: member b.For (items:seq<'a>, body:unit->M<'a>) : M<'a> You should notice that, in the While-method, the body is a simple type, and not a function as in the For method. You can embed some other statements, like let and function-calls inside your computation-expressions, but those can impossibly execute in a while-loop more than once. builder { while foo() do printfn "step" yield bar() } Why is the while-loop not executed more than once, but merely repeated? Why the significant difference from for-loops? Better yet, is there some intended strategy for using while-loops in computation-expressions?

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  • XSLT: add node inner text.

    - by nabo
    This is a slightly version of other question posted here: http://stackoverflow.com/questions/2888880/xslt-change-node-inner-text Imagine i use XSLT to transform the document: <a> <b/> <c/> </a> into this: <a> <b/> <c/> Hello world </a> In this case i can't use neither the <xsl:strip-space elements="*"/> element or the [normalize-space() != ''] predicate since there is no text in the place where i need to put new text. Any ideas? Thanks.

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  • Singleton Creation preference

    - by cwieland
    You can create singletons in a variety of ways. I am wondering which is better between these. +(ServerConnection*)shared{ static dispatch_once_t pred=0; __strong static id _sharedObject = nil; dispatch_once(&pred, ^{ _sharedObject = [[self alloc] init]; // or some other init method }); return _sharedObject; } I could see that this compiles down to something very fast. I would think that checking the predicate would be another function call. The other is: +(ServerConnection*)shared{ static ServerConnection* connection=nil; if (connection==nil) { connection=[[ServerConnection alloc] init]; } return connection; } Are there any major differences between the two? I know these are probably similar enough to not worry about it. But Just wondering.

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  • How to perform Cross Join with Linq

    - by berthin
    Cross join consists to perform a Cartesian product of two sets or sequences. The following example shows a simple Cartesian product of the sets A and B: A (a1, a2) B (b1, b2) => C (a1 b1,            a1 b2,            a2 b1,            a2, b2 ) is the Cartesian product's result. Linq to Sql allows using Cross join operations. Cross join is not equijoin, means that no predicate expression of equality in the Join clause of the query. To define a cross join query, you can use multiple from clauses. Note that there's no explicit operator for the cross join. In the following example, the query must join a sequence of Product with a sequence of Pricing Rules: 1: //Fill the data source 2: var products = new List<Product> 3: { 4: new Product{ProductID="P01",ProductName="Amaryl"}, 5: new Product {ProductID="P02", ProductName="acetaminophen"} 6: }; 7:  8: var pricingRules = new List<PricingRule> 9: { 10: new PricingRule {RuleID="R_1", RuleType="Free goods"}, 11: new PricingRule {RuleID="R_2", RuleType="Discount"}, 12: new PricingRule {RuleID="R_3", RuleType="Discount"} 13: }; 14: 15: //cross join query 16: var crossJoin = from p in products 17: from r in pricingRules 18: select new { ProductID = p.ProductID, RuleID = r.RuleID };   Below the definition of the two entities using in the above example.   1: public class Product 2: { 3: public string ProductID { get; set; } 4: public string ProductName { get; set; } 5: } 1: public class PricingRule 2: { 3: public string RuleID { get; set; } 4: public string RuleType { get; set; } 5: }   Doing this: 1: foreach (var result in crossJoin) 2: { 3: Console.WriteLine("({0} , {1})", result.ProductID, result.RuleID); 4: }   The output should be similar on this:   ( P01   -    R_1 )   ( P01   -    R_2 )   ( P01   -    R_3 )   ( P02   -    R_1 )   ( P02   -    R_2 )   ( P02   -    R_3) Conclusion Cross join operation is useful when performing a Cartesian product of two sequences object. However, it can produce very large result sets that may caused a problem of performance. So use with precautions :)

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  • What ever happened to the Defense Software Reuse System (DSRS)?

    - by emddudley
    I've been reading some papers from the early 90s about a US Department of Defense software reuse initiative called the Defense Software Reuse System (DSRS). The most recent mention of it I could find was in a paper from 2000 - A Survey of Software Reuse Repositories Defense Software Repository System (DSRS) The DSRS is an automated repository for storing and retrieving Reusable Software Assets (RSAs) [14]. The DSRS software now manages inventories of reusable assets at seven software reuse support centers (SRSCs). The DSRS serves as a central collection point for quality RSAs, and facilitates software reuse by offering developers the opportunity to match their requirements with existing software products. DSRS accounts are available for Government employees and contractor personnel currently supporting Government projects... ...The DoD software community is trying to change its software engineering model from its current software cycle to a process-driven, domain-specific, architecture-based, repository-assisted way of constructing software [15]. In this changing environment, the DSRS has the highest potential to become the DoD standard reuse repository because it is the only existing deployed, operational repository with multiple interoperable locations across DoD. Seven DSRS locations support nearly 1,000 users and list nearly 9,000 reusable assets. The DISA DSRS alone lists 3,880 reusable assets and has 400 user accounts... The far-term strategy of the DSRS is to support a virtual repository. These interconnected repositories will provide the ability to locate and share reusable components across domains and among the services. An effective and evolving DSRS is a central requirement to the success of the DoD software reuse initiative. Evolving DoD repository requirements demand that DISA continue to have an operational DSRS site to support testing in an actual repository operation and to support DoD users. The classification process for the DSRS is a basic technology for providing customer support [16]. This process is the first step in making reusable assets available for implementing the functional and technical migration strategies. ... [14] DSRS - Defense Technology for Adaptable, Reliable Systems URL: http://ssed1.ims.disa.mil/srp/dsrspage.html [15] STARS - Software Technology for Adaptable, Reliable Systems URL: http://www.stars.ballston.paramax.com/index.html [16] D. E. Perry and S. S. Popovitch, “Inquire: Predicate-based use and reuse,'' in Proceedings of the 8th Knowledge-Based Software Engineering Conference, pp. 144-151, September 1993. ... Is DSRS dead, and were there any post-mortem reports on it? Are there other more-recent US government initiatives or reports on software reuse?

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  • EKCalendar not added to iCal

    - by Alex75
    I have a strange behavior on my iPhone. I'm creating an application that uses calendar events (EventKit). The class that use is as follows: the .h one #import "GenericManager.h" #import <EventKit/EventKit.h> #define oneDay 60*60*24 #define oneHour 60*60 @protocol CalendarManagerDelegate; @interface CalendarManager : GenericManager /* * metodo che aggiunge un evento ad un calendario di nome Name nel giorno onDate. * L'evento da aggiungere viene recuperato tramite il dataSource che è quindi * OBBLIGATORIO (!= nil). * * Restituisce YES solo se il delegate è conforme al protocollo CalendarManagerDataSource. * NO altrimenti */ + (BOOL) addEventForCalendarWithName:(NSString *) name fromDate:(NSDate *)fromDate toDate: (NSDate *) toDate withDelegate:(id<CalendarManagerDelegate>) delegate; /* * metodo che aggiunge un evento per giorno compreso tra fromDate e toDate ad un * calendario di nome Name. L'evento da aggiungere viene recuperato tramite il dataSource * che è quindi OBBLIGATORIO (!= nil). * * Restituisce YES solo se il delegate è conforme al protocollo CalendarManagerDataSource. * NO altrimenti */ + (BOOL) addEventsForCalendarWithName:(NSString *) name fromDate:(NSDate *)fromDate toDate: (NSDate *) toDate withDelegate:(id<CalendarManagerDelegate>) delegate; @end @protocol CalendarManagerDelegate <NSObject> // viene inviato quando il calendario necessita informazioni sull' evento da aggiungere - (void) calendarManagerDidCreateEvent:(EKEvent *) event; @end the .m one // // CalendarManager.m // AppCampeggioSingolo // // Created by CreatiWeb Srl on 12/17/12. // Copyright (c) 2012 CreatiWeb Srl. All rights reserved. // #import "CalendarManager.h" #import "Commons.h" #import <objc/message.h> @interface CalendarManager () @end @implementation CalendarManager + (void)requestToEventStore:(EKEventStore *)eventStore delegate:(id)delegate fromDate:(NSDate *)fromDate toDate: (NSDate *) toDate name:(NSString *)name { if([eventStore respondsToSelector:@selector(requestAccessToEntityType:completion:)]) { // ios >= 6.0 [eventStore requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError *error) { if (granted) { [self addEventForCalendarWithName:name fromDate: fromDate toDate: toDate inEventStore:eventStore withDelegate:delegate]; } else { } }]; } else if (class_getClassMethod([EKCalendar class], @selector(calendarIdentifier)) != nil) { // ios >= 5.0 && ios < 6.0 [self addEventForCalendarWithName:name fromDate:fromDate toDate:toDate inEventStore:eventStore withDelegate:delegate]; } else { // ios < 5.0 EKCalendar *myCalendar = [eventStore defaultCalendarForNewEvents]; EKEvent *event = [self generateEventForCalendar:myCalendar fromDate: fromDate toDate: toDate inEventStore:eventStore withDelegate:delegate]; [eventStore saveEvent:event span:EKSpanThisEvent error:nil]; } } /* * metodo che recupera l'identificativo del calendario associato all'app o nil se non è mai stato creato. */ + (NSString *) identifierForCalendarName: (NSString *) name { NSString * confFileName = [self pathForFile:kCurrentCalendarFileName]; NSDictionary *confCalendar = [NSDictionary dictionaryWithContentsOfFile:confFileName]; NSString *currentIdentifier = [confCalendar objectForKey:name]; return currentIdentifier; } /* * memorizza l'identifier del calendario */ + (void) saveCalendarIdentifier:(NSString *) identifier andName: (NSString *) name { if (identifier != nil) { NSString * confFileName = [self pathForFile:kCurrentCalendarFileName]; NSMutableDictionary *confCalendar = [NSMutableDictionary dictionaryWithContentsOfFile:confFileName]; if (confCalendar == nil) { confCalendar = [NSMutableDictionary dictionaryWithCapacity:1]; } [confCalendar setObject:identifier forKey:name]; [confCalendar writeToFile:confFileName atomically:YES]; } } + (EKCalendar *)getCalendarWithName:(NSString *)name inEventStore:(EKEventStore *)eventStore withLocalSource: (EKSource *)localSource forceCreation:(BOOL) force { EKCalendar *myCalendar; NSString *identifier = [self identifierForCalendarName:name]; if (force || identifier == nil) { NSLog(@"create new calendar"); if (class_getClassMethod([EKCalendar class], @selector(calendarForEntityType:eventStore:)) != nil) { // da ios 6.0 in avanti myCalendar = [EKCalendar calendarForEntityType:EKEntityTypeEvent eventStore:eventStore]; } else { myCalendar = [EKCalendar calendarWithEventStore:eventStore]; } myCalendar.title = name; myCalendar.source = localSource; NSError *error = nil; BOOL result = [eventStore saveCalendar:myCalendar commit:YES error:&error]; if (result) { NSLog(@"Saved calendar %@ to event store. %@",myCalendar,eventStore); } else { NSLog(@"Error saving calendar: %@.", error); } [self saveCalendarIdentifier:myCalendar.calendarIdentifier andName:name]; } // You can also configure properties like the calendar color etc. The important part is to store the identifier for later use. On the other hand if you already have the identifier, you can just fetch the calendar: else { myCalendar = [eventStore calendarWithIdentifier:identifier]; NSLog(@"fetch an old-one = %@",myCalendar); } return myCalendar; } + (EKCalendar *)addEventForCalendarWithName: (NSString *) name fromDate:(NSDate *)fromDate toDate: (NSDate *) toDate inEventStore:(EKEventStore *)eventStore withDelegate: (id<CalendarManagerDelegate>) delegate { // da ios 5.0 in avanti EKCalendar *myCalendar; EKSource *localSource = nil; for (EKSource *source in eventStore.sources) { if (source.sourceType == EKSourceTypeLocal) { localSource = source; break; } } @synchronized(self) { myCalendar = [self getCalendarWithName:name inEventStore:eventStore withLocalSource:localSource forceCreation:NO]; if (myCalendar == nil) myCalendar = [self getCalendarWithName:name inEventStore:eventStore withLocalSource:localSource forceCreation:YES]; NSLog(@"End synchronized block %@",myCalendar); } EKEvent *event = [self generateEventForCalendar:myCalendar fromDate:fromDate toDate:toDate inEventStore:eventStore withDelegate:delegate]; [eventStore saveEvent:event span:EKSpanThisEvent error:nil]; return myCalendar; } + (EKEvent *) generateEventForCalendar: (EKCalendar *) calendar fromDate:(NSDate *)fromDate toDate: (NSDate *) toDate inEventStore:(EKEventStore *) eventStore withDelegate:(id<CalendarManagerDelegate>) delegate { EKEvent *event = [EKEvent eventWithEventStore:eventStore]; event.startDate=fromDate; event.endDate=toDate; [delegate calendarManagerDidCreateEvent:event]; [event setCalendar:calendar]; // ricerca dell'evento nel calendario, se ne trovo uno uguale non lo inserisco NSPredicate *predicate = [eventStore predicateForEventsWithStartDate:fromDate endDate:toDate calendars:[NSArray arrayWithObject:calendar]]; NSArray *matchEvents = [eventStore eventsMatchingPredicate:predicate]; if ([matchEvents count] > 0) { // ne ho trovati di gia' presenti, vediamo se uno e' quello che vogliamo inserire BOOL found = NO; for (EKEvent *fetchEvent in matchEvents) { if ([fetchEvent.title isEqualToString:event.title] && [fetchEvent.notes isEqualToString:event.notes]) { found = YES; break; } } if (found) { // esiste già e quindi non lo inserisco NSLog(@"OH NOOOOOO!!"); event = nil; } } return event; } #pragma mark - Public Methods + (BOOL) addEventForCalendarWithName:(NSString *) name fromDate:(NSDate *)fromDate toDate: (NSDate *) toDate withDelegate:(id<CalendarManagerDelegate>) delegate { BOOL retVal = YES; EKEventStore *eventStore=[[EKEventStore alloc] init]; if ([delegate conformsToProtocol:@protocol(CalendarManagerDelegate)]) { [self requestToEventStore:eventStore delegate:delegate fromDate:fromDate toDate: toDate name:name]; } else { retVal = NO; } return retVal; } + (BOOL) addEventsForCalendarWithName:(NSString *) name fromDate:(NSDate *)fromDate toDate: (NSDate *) toDate withDelegate:(id<CalendarManagerDelegate>) delegate { BOOL retVal = YES; NSDate *dateCursor = fromDate; EKEventStore *eventStore=[[EKEventStore alloc] init]; if ([delegate conformsToProtocol:@protocol(CalendarManagerDelegate)]) { while (retVal && ([dateCursor compare:toDate] == NSOrderedAscending)) { NSDate *finish = [dateCursor dateByAddingTimeInterval:oneDay]; [self requestToEventStore:eventStore delegate:delegate fromDate: dateCursor toDate: finish name:name]; dateCursor = [dateCursor dateByAddingTimeInterval:oneDay]; } } else { retVal = NO; } return retVal; } @end In practice, on my iphone I get the log: fetch an old-one = (null) 19/12/2012 11:33:09.520 AppCampeggioSingolo [730:8 b1b] create new calendar 19/12/2012 11:33:09.558 AppCampeggioSingolo [730:8 b1b] Saved calendar EKCalendar every time I add an event, then I look and I can not find it on iCal calendar event he added. On the iPhone of a friend of mine, however, everything is working correctly. I doubt that the problem stems from the code, but just do not understand what it could be. I searched all day yesterday and part of today on google but have not found anything yet. Any help will be greatly appreciated EDIT: I forgot the call wich is [CalendarManager addEventForCalendarWithName: @"myCalendar" fromDate:fromDate toDate: toDate withDelegate:self]; in the delegate method simply set title and notes of the event like this - (void) calendarManagerDidCreateEvent:(EKEvent *) event { event.title = @"the title"; event.notes = @"some notes"; }

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  • SQL SERVER – Introduction to Extended Events – Finding Long Running Queries

    - by pinaldave
    The job of an SQL Consultant is very interesting as always. The month before, I was busy doing query optimization and performance tuning projects for our clients, and this month, I am busy delivering my performance in Microsoft SQL Server 2005/2008 Query Optimization and & Performance Tuning Course. I recently read white paper about Extended Event by SQL Server MVP Jonathan Kehayias. You can read the white paper here: Using SQL Server 2008 Extended Events. I also read another appealing chapter by Jonathan in the book, SQLAuthority Book Review – Professional SQL Server 2008 Internals and Troubleshooting. After reading these excellent notes by Jonathan, I decided to upgrade my course and include Extended Event as one of the modules. This week, I have delivered Extended Events session two times and attendees really liked the said course. They really think Extended Events is one of the most powerful tools available. Extended Events can do many things. I suggest that you read the white paper I mentioned to learn more about this tool. Instead of writing a long theory, I am going to write a very quick script for Extended Events. This event session captures all the longest running queries ever since the event session was started. One of the many advantages of the Extended Events is that it can be configured very easily and it is a robust method to collect necessary information in terms of troubleshooting. There are many targets where you can store the information, which include XML file target, which I really like. In the following Events, we are writing the details of the event at two locations: 1) Ringer Buffer; and 2) XML file. It is not necessary to write at both places, either of the two will do. -- Extended Event for finding *long running query* IF EXISTS(SELECT * FROM sys.server_event_sessions WHERE name='LongRunningQuery') DROP EVENT SESSION LongRunningQuery ON SERVER GO -- Create Event CREATE EVENT SESSION LongRunningQuery ON SERVER -- Add event to capture event ADD EVENT sqlserver.sql_statement_completed ( -- Add action - event property ACTION (sqlserver.sql_text, sqlserver.tsql_stack) -- Predicate - time 1000 milisecond WHERE sqlserver.sql_statement_completed.duration > 1000 ) -- Add target for capturing the data - XML File ADD TARGET package0.asynchronous_file_target( SET filename='c:\LongRunningQuery.xet', metadatafile='c:\LongRunningQuery.xem'), -- Add target for capturing the data - Ring Bugger ADD TARGET package0.ring_buffer (SET max_memory = 4096) WITH (max_dispatch_latency = 1 seconds) GO -- Enable Event ALTER EVENT SESSION LongRunningQuery ON SERVER STATE=START GO -- Run long query (longer than 1000 ms) SELECT * FROM AdventureWorks.Sales.SalesOrderDetail ORDER BY UnitPriceDiscount DESC GO -- Stop the event ALTER EVENT SESSION LongRunningQuery ON SERVER STATE=STOP GO -- Read the data from Ring Buffer SELECT CAST(dt.target_data AS XML) AS xmlLockData FROM sys.dm_xe_session_targets dt JOIN sys.dm_xe_sessions ds ON ds.Address = dt.event_session_address JOIN sys.server_event_sessions ss ON ds.Name = ss.Name WHERE dt.target_name = 'ring_buffer' AND ds.Name = 'LongRunningQuery' GO -- Read the data from XML File SELECT event_data_XML.value('(event/data[1])[1]','VARCHAR(100)') AS Database_ID, event_data_XML.value('(event/data[2])[1]','INT') AS OBJECT_ID, event_data_XML.value('(event/data[3])[1]','INT') AS object_type, event_data_XML.value('(event/data[4])[1]','INT') AS cpu, event_data_XML.value('(event/data[5])[1]','INT') AS duration, event_data_XML.value('(event/data[6])[1]','INT') AS reads, event_data_XML.value('(event/data[7])[1]','INT') AS writes, event_data_XML.value('(event/action[1])[1]','VARCHAR(512)') AS sql_text, event_data_XML.value('(event/action[2])[1]','VARCHAR(512)') AS tsql_stack, CAST(event_data_XML.value('(event/action[2])[1]','VARCHAR(512)') AS XML).value('(frame/@handle)[1]','VARCHAR(50)') AS handle FROM ( SELECT CAST(event_data AS XML) event_data_XML, * FROM sys.fn_xe_file_target_read_file ('c:\LongRunningQuery*.xet', 'c:\LongRunningQuery*.xem', NULL, NULL)) T GO -- Clean up. Drop the event DROP EVENT SESSION LongRunningQuery ON SERVER GO Just run the above query, afterwards you will find following result set. This result set contains the query that was running over 1000 ms. In our example, I used the XML file, and it does not reset when SQL services or computers restarts (if you are using DMV, it will reset when SQL services restarts). This event session can be very helpful for troubleshooting. Let me know if you want me to write more about Extended Events. I am totally fascinated with this feature, so I’m planning to acquire more knowledge about it so I can determine its other usages. Reference : Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, SQL, SQL Authority, SQL Optimization, SQL Performance, SQL Query, SQL Scripts, SQL Server, SQL Tips and Tricks, SQL Training, SQLServer, T SQL, Technology Tagged: SQL Extended Events

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  • Calling XAI Inbound Services from Oracle BI Publisher

    - by ACShorten
    Note: This technique requires Oracle BI Publisher 1.1.3.4.1 which supports Service Complex Types. Web Services require credentials for authentication. Note: The deafults for the product installation are used in this article. If your site uses alternative values then substitute those alternatives where applicable. Note: Examples shown in this article are examples for illustrative purposes only. When building a report in Oracle BI Publisher it may be necessary to call an XAI Inbound Service to get information via the object rather than directly calling the database tables for various reasons: The CLOB fields used in the Object are accessible for a report. Note: CLOB fields cannot be used as criteria in the current release. Objects can take advantage of algorithms to format or calculate additional data that is not stored in the database directly. For example, Information format strings can automatically generated by the object which gives consistent information between a report and the online screens. To use this facility the following process must be performed: Ensure that the product group, cisusers by default, is enabled for the SPLServiceBean in the console. This allows BI Publisher access to call Web Services directly. To ensure this follow the instructions below: Logon to the Oracle WebLogic server console using an appropriate administrator account. By default the user system or weblogic is provided for this purpose. Navigate to the Security Realms section and select your configured realm. This is set to myrealm by default. In the Roles and Policies section, expand the SPLService section of the Deployments option to reveal the SPLServiceBean roles. If there is no role associated with the SPLServiceBean, create a new EJB role and specify the cisusers role, by default. For example:   Add a Role Condition to the role just created, with a Predicate List of Group and specify cisusers as the Group Argument Name. For example: Save all your changes. The XAI Inbound Services to be used by BI Publisher must be defined prior to using the interface. Refer to the XAI Best Practices (Doc Id: 942074.1) from My Oracle Support or via the online help for more information about this process. Inside BI Publisher create your report, according to the BI Publisher documentation. When specifying the dataset, under the Data Model Report option, specify the following to use an XAI Inbound Service as a data source: Parameter Comment Type Web Service Complex Type true Username Any valid user name within the product. This user MUST have security access to the objects referenced in the XAI Inbound Service Password Authentication password for Username Timeout Timeout, in seconds, set for the Web Service call. For example 60 seconds. WSDL URL Use the WSDL URL on the XAI Inbound Service definition as your WSDL URL. It will be in the following format by default:http://<host>:<port>/<server>/XAIApp/xaiserver/<service>?WSDLwhere: <host> - Host Name of Web Application Server <port> - Port allocated to Web Application Server for product access <server> - Server context for server <service> - XAI Inbound Service Name Note: For customers using secure transmission should substitute https instead of http and use the HTTPS port allocated to the product at installation time. Web Service Select the name of the service that shows in the drop-down menu. If no service name shows up, it means that Publisher could not establish a connection with the server or WSDL name provided in the above URL in order to get the service name. See BI Publisher server log for more information. Method Select the name of the Method that shows in the drop-down menu. A method name should show in the Method drop-down menu once the Web Service name is selected. For example: Additionally, filters can be used from the Web Service that can be generated, required or optional, from the WSDL in the Parameter List. For example:

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  • Asynchrony in C# 5: Dataflow Async Logger Sample

    - by javarg
    Check out this (very simple) code examples for TPL Dataflow. Suppose you are developing an Async Logger to register application events to different sinks or log writers. The logger architecture would be as follow: Note how blocks can be composed to achieved desired behavior. The BufferBlock<T> is the pool of log entries to be process whereas linked ActionBlock<TInput> represent the log writers or sinks. The previous composition would allows only one ActionBlock to consume entries at a time. Implementation code would be something similar to (add reference to System.Threading.Tasks.Dataflow.dll in %User Documents%\Microsoft Visual Studio Async CTP\Documentation): TPL Dataflow Logger var bufferBlock = new BufferBlock<Tuple<LogLevel, string>>(); ActionBlock<Tuple<LogLevel, string>> infoLogger =     new ActionBlock<Tuple<LogLevel, string>>(         e => Console.WriteLine("Info: {0}", e.Item2)); ActionBlock<Tuple<LogLevel, string>> errorLogger =     new ActionBlock<Tuple<LogLevel, string>>(         e => Console.WriteLine("Error: {0}", e.Item2)); bufferBlock.LinkTo(infoLogger, e => (e.Item1 & LogLevel.Info) != LogLevel.None); bufferBlock.LinkTo(errorLogger, e => (e.Item1 & LogLevel.Error) != LogLevel.None); bufferBlock.Post(new Tuple<LogLevel, string>(LogLevel.Info, "info message")); bufferBlock.Post(new Tuple<LogLevel, string>(LogLevel.Error, "error message")); Note the filter applied to each link (in this case, the Logging Level selects the writer used). We can specify message filters using Predicate functions on each link. Now, the previous sample is useless for a Logger since Logging Level is not exclusive (thus, several writers could be used to process a single message). Let´s use a Broadcast<T> buffer instead of a BufferBlock<T>. Broadcast Logger var bufferBlock = new BroadcastBlock<Tuple<LogLevel, string>>(     e => new Tuple<LogLevel, string>(e.Item1, e.Item2)); ActionBlock<Tuple<LogLevel, string>> infoLogger =     new ActionBlock<Tuple<LogLevel, string>>(         e => Console.WriteLine("Info: {0}", e.Item2)); ActionBlock<Tuple<LogLevel, string>> errorLogger =     new ActionBlock<Tuple<LogLevel, string>>(         e => Console.WriteLine("Error: {0}", e.Item2)); ActionBlock<Tuple<LogLevel, string>> allLogger =     new ActionBlock<Tuple<LogLevel, string>>(     e => Console.WriteLine("All: {0}", e.Item2)); bufferBlock.LinkTo(infoLogger, e => (e.Item1 & LogLevel.Info) != LogLevel.None); bufferBlock.LinkTo(errorLogger, e => (e.Item1 & LogLevel.Error) != LogLevel.None); bufferBlock.LinkTo(allLogger, e => (e.Item1 & LogLevel.All) != LogLevel.None); bufferBlock.Post(new Tuple<LogLevel, string>(LogLevel.Info, "info message")); bufferBlock.Post(new Tuple<LogLevel, string>(LogLevel.Error, "error message")); As this block copies the message to all its outputs, we need to define the copy function in the block constructor. In this case we create a new Tuple, but you can always use the Identity function if passing the same reference to every output. Try both scenarios and compare the results.

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  • A quick look at: sys.dm_os_buffer_descriptors

    - by Jonathan Allen
    SQL Server places data into cache as it reads it from disk so as to speed up future queries. This dmv lets you see how much data is cached at any given time and knowing how this changes over time can help you ensure your servers run smoothly and are adequately resourced to run your systems. This dmv gives the number of cached pages in the buffer pool along with the database id that they relate to: USE [tempdb] GO SELECT COUNT(*) AS cached_pages_count , CASE database_id WHEN 32767 THEN 'ResourceDb' ELSE DB_NAME(database_id) END AS Database_name FROM sys.dm_os_buffer_descriptors GROUP BY DB_NAME(database_id) , database_id ORDER BY cached_pages_count DESC; This gives you results which are quite useful, but if you add a new column with the code: …to convert the pages value to show a MB value then they become more relevant and meaningful. To see how your server reacts to queries, start up SSMS and connect to a test server and database – mine is called AdventureWorks2008. Make sure you start from a know position by running: -- Only run this on a test server otherwise your production server's-- performance may drop off a cliff and your phone will start ringing. DBCC DROPCLEANBUFFERS GO Now we can run a query that would normally turn a DBA’s hair white: USE [AdventureWorks2008] go SELECT * FROM [Sales].[SalesOrderDetail] AS sod INNER JOIN [Sales].[SalesOrderHeader] AS soh ON [sod].[SalesOrderID] = [soh].[SalesOrderID] …and then check our cache situation: A nice low figure – not! Almost 2000 pages of data in cache equating to approximately 15MB. Luckily these tables are quite narrow; if this had been on a table with more columns then this could be even more dramatic. So, let’s make our query more efficient. After resetting the cache with the DROPCLEANBUFFERS and FREEPROCCACHE code above, we’ll only select the columns we want and implement a WHERE predicate to limit the rows to a specific customer. SELECT [sod].[OrderQty] , [sod].[ProductID] , [soh].[OrderDate] , [soh].[CustomerID] FROM [Sales].[SalesOrderDetail] AS sod INNER JOIN [Sales].[SalesOrderHeader] AS soh ON [sod].[SalesOrderID] = [soh].[SalesOrderID] WHERE [soh].[CustomerID] = 29722 …and check our effect cache: Now that is more sympathetic to our server and the other systems sharing its resources. I can hear you asking: “What has this got to do with logging, Jonathan?” Well, a smart DBA will keep an eye on this metric on their servers so they know how their hardware is coping and be ready to investigate anomalies so that no ‘disruptive’ code starts to unsettle things. Capturing this information over a period of time can lead you to build a picture of how a database relies on the cache and how it interacts with other databases. This might allow you to decide on appropriate schedules for over night jobs or otherwise balance the work of your server. You could schedule this job to run with a SQL Agent job and store the data in your DBA’s database by creating a table with: IF OBJECT_ID('CachedPages') IS NOT NULL DROP TABLE CachedPages CREATE TABLE CachedPages ( cached_pages_count INT , MB INT , Database_Name VARCHAR(256) , CollectedOn DATETIME DEFAULT GETDATE() ) …and then filling it with: INSERT INTO [dbo].[CachedPages] ( [cached_pages_count] , [MB] , [Database_Name] ) SELECT COUNT(*) AS cached_pages_count , ( COUNT(*) * 8.0 ) / 1024 AS MB , CASE database_id WHEN 32767 THEN 'ResourceDb' ELSE DB_NAME(database_id) END AS Database_name FROM sys.dm_os_buffer_descriptors GROUP BY database_id After this has been left logging your system metrics for a while you can easily see how your databases use the cache over time and may see some spikes that warrant your attention. This sort of logging can be applied to all sorts of server statistics so that you can gather information that will give you baseline data on how your servers are performing. This means that when you get a problem you can see what statistics are out of their normal range and target you efforts to resolve the issue more rapidly.

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  • LexisNexis and Oracle Join Forces to Prevent Fraud and Identity Abuse

    - by Tanu Sood
    Author: Mark Karlstrand About the Writer:Mark Karlstrand is a Senior Product Manager at Oracle focused on innovative security for enterprise web and mobile applications. Over the last sixteen years Mark has served as director in a number of tech startups before joining Oracle in 2007. Working with a team of talented architects and engineers Mark developed Oracle Adaptive Access Manager, a best of breed access security solution.The world’s top enterprise software company and the world leader in data driven solutions have teamed up to provide a new integrated security solution to prevent fraud and misuse of identities. LexisNexis Risk Solutions, a Gold level member of Oracle PartnerNetwork (OPN), today announced it has achieved Oracle Validated Integration of its Instant Authenticate product with Oracle Identity Management.Oracle provides the most complete Identity and Access Management platform. The only identity management provider to offer advanced capabilities including device fingerprinting, location intelligence, real-time risk analysis, context-aware authentication and authorization makes the Oracle offering unique in the industry. LexisNexis Risk Solutions provides the industry leading Instant Authenticate dynamic knowledge based authentication (KBA) service which offers customers a secure and cost effective means to authenticate new user or prove authentication for password resets, lockouts and such scenarios. Oracle and LexisNexis now offer an integrated solution that combines the power of the most advanced identity management platform and superior data driven user authentication to stop identity fraud in its tracks and, in turn, offer significant operational cost savings. The solution offers the ability to challenge users with dynamic knowledge based authentication based on the risk of an access request or transaction thereby offering an additional level to other authentication methods such as static challenge questions or one-time password when needed. For example, with Oracle Identity Management self-service, the forgotten password reset workflow utilizes advanced capabilities including device fingerprinting, location intelligence, risk analysis and one-time password (OTP) via short message service (SMS) to secure this sensitive flow. Even when a user has lost or misplaced his/her mobile phone and, therefore, cannot receive the SMS, the new integrated solution eliminates the need to contact the help desk. The Oracle Identity Management platform dynamically switches to use the LexisNexis Instant Authenticate service for authentication if the user is not able to authenticate via OTP. The advanced Oracle and LexisNexis integrated solution, thus, both improves user experience and saves money by avoiding unnecessary help desk calls. Oracle Identity and Access Management secures applications, Juniper SSL VPN and other web resources with a thoroughly modern layered and context-aware platform. Users don't gain access just because they happen to have a valid username and password. An enterprise utilizing the Oracle solution has the ability to predicate access based on the specific context of the current situation. The device, location, temporal data, and any number of other attributes are evaluated in real-time to determine the specific risk at that moment. If the risk is elevated a user can be challenged for additional authentication, refused access or allowed access with limited privileges. The LexisNexis Instant Authenticate dynamic KBA service plugs into the Oracle platform to provide an additional layer of security by validating a user's identity in high risk access or transactions. The large and varied pool of data the LexisNexis solution utilizes to quiz a user makes this challenge mechanism even more robust. This strong combination of Oracle and LexisNexis user authentication capabilities greatly mitigates the risk of exposing sensitive applications and services on the Internet which helps an enterprise grow their business with confidence.Resources:Press release: LexisNexis® Achieves Oracle Validated Integration with Oracle Identity Management Oracle Access Management (HTML)Oracle Adaptive Access Manager (pdf)

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