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• snmptt not translating traps, even with translate_log_trap_oid=1

  - by mbrownnyc

  I am having some trouble configuring snmptt to properly translate snmp traps. The following is a problem: /etc/snmp/snmptt.conf reflects: EVENT fgFmTrapIfChange .1.3.6.1.4.1.12356.101.6.0.1004 "Status Events" Critical FORMAT $* EXEC /usr/local/nagios/libexec/eventhandlers/submit_check_result $r "snmp_traps" 2 "$O: $+*" "$*" SDESC Trap is sent to the managing FortiManager if an interface IP is changed Variables: 1: fnSysSerial 2: ifName 3: fgManIfIp 4: fgManIfMask EDESC when a trap is received, /var/log/messages reflects: Sep 6 12:07:32 SNMPMANAGERHOST snmptrapd[15385]: 2012-09-06 12:07:32 <UNKNOWN> [UDP: [192.168.100.2]:162->[192.168.100.31]]: #012.1.3.6.1.2.1.1.3.0 = Timeticks: (707253943) 81 days, 20:35:39.43 #011.1.3.6.1.6.3.1.1.4.1.0 = OID: .1.3.6.1.4.1.12356.101.6.0.1004 #011.1.3.6.1.4.1.12356.100.1.1.1.0 = STRING: FGTNNNNNNNNN #011.1.3.6.1.2.1.31.1.1.1.1.10 = STRING: internal4 #011.1.3.6.1.4.1.12356.101.6.2.1.0 = IpAddress: 192.168.65.100 #011.1.3.6.1.4.1.12356.101.6.2.2.0 = IpAddress: 255.255.255.0 Sep 6 12:07:37 SNMPMANAGERHOST icinga: EXTERNAL COMMAND: PROCESS_SERVICE_CHECK_RESULT; 192.168.100.2; snmp_traps; 2; enterprises.12356.101.6.0.1004: enterprises.12356.100.1.1.1.0:FGTNNNNNNNNN ifName.10:internal4 enterprises.12356.101.6.2.1.0:192.168.65.100 enterprises.12356.101.6.2.2.0:255.255.255.0 Since the icinga entry reflects the EXEC, it's obvious there is no translations occurring by snmptt. I have verified that translate_log_trap_oid and net_snmp_perl_enable is enabled in snmptt.ini When using --debug=1 to start snmptt, I see the following in the --debugfile: ********** Net-SNMP version 5.05 Perl module enabled ********** The main NET-SNMP version is reported as NET-SNMP version: 5.5. What else can be done to verify that snmptt is configured properly to translate traps? I have run snmptt-net-snmp-test to verify whatever net-snmp-perl version I have installed properly supports translations. The output indicates it does. /root/snmptt_1.3/snmptt-net-snmp-test --best_guess=2 SNMPTT Net-SNMP Test v1.0 (c) 2003 Alex Burger http://snmptt.sourceforge.net MIBS:RFC1213-MIB best_guess: 2 Testing translateObj ******************** Testing: .1.3.6.1.2.1.1.1, long_names=disabled, include_module=disabled Test passed. Result: sysDescr Testing: .1.3.6.1.2.1.1.1, long_names=disabled, include_module=enabled Test passed. Result: RFC1213-MIB::sysDescr Testing: .1.3.6.1.2.1.1.1, long_names=enabled, include_module=disabled Test passed. Result: .iso.org.dod.internet.mgmt.mib-2.system.sysDescr Testing: .1.3.6.1.2.1.1.1, long_names=enabled, include_module=enabled Test passed. Result: RFC1213-MIB::.iso.org.dod.internet.mgmt.mib-2.system.sysDescr Testing: sysDescr, long_names=disabled, include_module=disabled Test passed. Result: .1.3.6.1.2.1.1.1 Testing: RFC1213-MIB::sysDescr, long_names=disabled, include_module=disabled Test passed. Result: .1.3.6.1.2.1.1.1 Testing: system.sysDescr, long_names=disabled, include_module=disabled Test passed. Result: .1.3.6.1.2.1.1.1 Testing: RFC1213-MIB::system.sysDescr, long_names=disabled, include_module=disabled Test passed. Result: .1.3.6.1.2.1.1.1 Testing: .iso.org.dod.internet.mgmt.mib-2.system.sysDescr, long_names=disabled, include_module=disabled Test passed. Result: .1.3.6.1.2.1.1.1 Testing getType *************** Testing: .1.3.6.1.2.1.4.1 Test passed. Result: INTEGER Testing: ipForwarding Test passed. Result: INTEGER Testing Description ******************* Test passed. Result: ------------------------------------------------- The indication of whether this entity is acting as an IP gateway in respect to the forwarding of datagrams received by, but not addressed to, this entity. IP gateways forward datagrams. IP hosts do not (except those source-routed via the host). Note that for some managed nodes, this object may take on only a subset of the values possible. Accordingly, it is appropriate for an agent to return a `badValue' response if a management station attempts to change this object to an inappropriate value. ------------------------------------------------- I have manually gone through the MIB with the definition that's not resolving, and verified that it is properly linking back to the proper resolved definition. It is: FORTINET-FORTIGATE-MIB.txt contains: fgFmTrapIfChange NOTIFICATION-TYPE OBJECTS { fnSysSerial, ifName, fgManIfIp, fgManIfMask } STATUS current DESCRIPTION "Trap is sent to the managing FortiManager if an interface IP is changed" ::= { fgFmTrapPrefix 1004 } fgFmTrapPrefix OBJECT IDENTIFIER ::= { fgMgmt 0 } fgMgmt OBJECT IDENTIFIER ::= { fnFortiGateMib 6 } fnFortiGateMib ::= { fortinet 101 } IMPORTS FnBoolState, FnIndex, fnAdminEntry, fnSysSerial, fortinet FROM FORTINET-CORE-MIB fortinet MODULE-IDENTITY ::= { enterprises 12356 } LOOKS GOOD!!!!! 1.3.6.1.4.1.12356.101.6.0.1004 I've exhausted all the documentation and even posted fruitlessly in the snmptt-users mailing list. I can not prove it is the MIB. Why would snmptt fail to translate traps? Thanks, Matt

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• Kohana 3 simple relations..

  - by matiit

  I'm trying to write a very simple cms (for learning purposes) in kohana 3 web framework. I have my db schemas and i want to map it to ORM but i have problems with relations. Schemas:articles and categories One article has one category. One category might has many articles of course. I think it is has_one relationship in article table.(?) Now php code. I need to create application/classes/models/article.php first, yes? class Model_Article extends ORM { protected // and i am not sure what i suppose to write here }

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• NHibernate IUserType convert nullable DateTime to DB not-null value

  - by barakbbn

  I have legacy DB that store dates that means no-date as 9999-21-31, The column Till_Date is of type DateTime not-null="true". in the application i want to build persisted class that represent no-date as null, So i used nullable DateTime in C# //public DateTime? TillDate {get; set; } I created IUserType that knows to convert the entity null value to DB 9999-12-31 but it seems that NHibernate doesn't call SafeNullGet, SafeNullSet on my IUserType when the entity value is null, and report a null is used for not-null column. I tried to by-pass it by mapping the column as not-null="false" (changed only the mapping file, not the DB) but it still didn't help, only now it tries to insert the null value to the DB and get ADOException. Any knowledge if NHibernate doesn't support IUseType that convert null to not-null values? Thanks //Implementation public class NullableDateTimeToNotNullUserType : IUserType { private static readonly DateTime MaxDate = new DateTime(9999, 12, 31); public new bool Equals(object x, object y) { //This didn't work as well if (ReferenceEquals(x, y)) return true; //if(x == null && y == null) return false; if (x == null || y == null) return false; return x.Equals(y); } public int GetHashCode(object x) { return x == null ? 0 : x.GetHashCode(); } public object NullSafeGet(IDataReader rs, string[] names, object owner) { var value = rs.GetDateTime(rs.GetOrdinal(names[0])); return (value == MaxDate)? null : value; } public void NullSafeSet(IDbCommand cmd, object value, int index) { var dateValue = (DateTime?)value; var dbValue = (dateValue.HasValue) ? dateValue.Value : MaxDate; ((IDataParameter)cmd.Parameters[index]).Value = dbValue; } public object DeepCopy(object value) { return value; } public object Replace(object original, object target, object owner) { return original; } public object Assemble(object cached, object owner) { return cached; } public object Disassemble(object value) { return value; } public SqlType[] SqlTypes { get { return new[] { NHibernateUtil.DateTime.SqlType }; } } public Type ReturnedType { get { return typeof(DateTime?); } } public bool IsMutable { get { return false; } } } } //Final Implementation with fixes. make the column mapping in hbm.xml not-null="false" public class NullableDateTimeToNotNullUserType : IUserType { private static readonly DateTime MaxDate = new DateTime(9999, 12, 31); public new bool Equals(object x, object y) { //This didn't work as well if (ReferenceEquals(x, y)) return true; //if(x == null && y == null) return false; if (x == null || y == null) return false; return x.Equals(y); } public int GetHashCode(object x) { return x == null ? 0 : x.GetHashCode(); } public object NullSafeGet(IDataReader rs, string[] names, object owner) { var value = NHibernateUtil.Date.NullSafeGet(rs, names[0]); return (value == MaxDate)? default(DateTime?) : value; } public void NullSafeSet(IDbCommand cmd, object value, int index) { var dateValue = (DateTime?)value; var dbValue = (dateValue.HasValue) ? dateValue.Value : MaxDate; NHibernateUtil.Date.NullSafeSet(cmd, valueToSet, index); } public object DeepCopy(object value) { return value; } public object Replace(object original, object target, object owner) { return original; } public object Assemble(object cached, object owner) { return cached; } public object Disassemble(object value) { return value; } public SqlType[] SqlTypes { get { return new[] { NHibernateUtil.DateTime.SqlType }; } } public Type ReturnedType { get { return typeof(DateTime?); } } public bool IsMutable { get { return false; } } } }

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• what do I need to start developing in .NET

  - by Mahew

  Hi All, thanks in advance for your time, Over the last year I have moved from a beginner PHP developer to a more intermediate developer, I use Mac OS X and a local development server environment (MAMP). I am thinking about starting to develop using the .NET framework. Can anyone give me some advice? What do I need to begin? How similar is .NET to PHP? What is the relationship between ASP and .NET? Is there anything novel or vital I should know about developing in .NET? (I know .NET is written using microsoft technologies...) Anything of use would be valuable! Cheers!

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• Adding links to full change forms for inline items in django admin?

  - by David Eyk

  I have a standard admin change form for an object, with the usual StackedInline forms for a ForeignKey relationship. I would like to be able to link each inline item to its corresponding full-sized change form, as the inline item has inlined items of its own, and I can't nest them. I've tried everything from custom widgets to custom templates, and can't make anything work. So far, the "solutions" I've seen in the form of snippets just plain don't seem to work for inlines. I'm getting ready to try some DOM hacking with jQuery just to get it working and move on. I hope I must be missing something very simple, as this seems like such a simple task! Using Django 1.2.

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• rails accessing value from facebooker hash/array

  - by Ben

  This is my first time using the facebooker plugin with rails, and I'm having trouble accessing user info. The website uses FB connect to authenticate users. I am trying to get the name of the university that the logged in user attends. When I use the command <%= facebook_session.user.education_history[:name] %>, I get an error "Symbol as array index". I have also tried using education_history[1], but that just returns "# Facebooker::EducationInfo:<some sort of alphanumeric hash value>" When I use something like <%= facebook_session.user.relationship_status %> , it returns the relationship status just fine. Similarly, <%= facebook_session.user.hometown_location.city %> returns the city name just fine. I've checked out the documentation for facebooker, but I can't figure out the correct way to get the values I need. Any idea on how to get this to work? Thanks!

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• Django many to many annotations and filters

  - by dl8

  So I have two models, Person and Film where they're in a many to many relationship. My goal is to grab a film, and output the persons that have also appeared in at least 10 films. For example I can get the count individually by: >>> Person.objects.get(short__istartswith = "Matt Damon").film_set.count() 71 However, if I try to filter all the actors of a particular film out: >>> Film.objects.get(name__istartswith="Saving Private Ryan").actors.all().annotate(film_count=Count('film')).filter(film_count__gte=10) [] it returns an empty set since if I manually look at everyone's film_count it's 1, even though an actor such as Matt Damon (as seen above) has been in 71 films in my db. As you can see with this query, the annotation doesn't work: >>> Film.objects.get(name__istartswith="Saving Private Ryan").actors.all().annotate(film_count=Count('film'))[0].film_count 1 >>> Film.objects.get(name__istartswith="Saving Private Ryan").actors.all().annotate(film_count=Count('film'))[0].film_set.count() 7 and I can't seem to figure out a way to filter it by the film_set.count()

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• What is your strategy to avoid dynamic typing errors in Python (NoneType has not attribute x)?

  - by Koen Bok

  Python is one of my favorite languages, but I really have a love/hate relationship with it's dynamicness. Apart from the advantages, it often results in me forgetting to check a type, trying to call an attribute and getting the NoneType (or any other) has no attribute x error. A lot of them are pretty harmless but if not handled correctly they can bring down your entire app/process/etc. Over time I got better predicting where these could pop up and adding explicit type checking, but because I'm only human I miss one occasionally and then some end-user finds it. So I'm interested in your strategy to avoid these. Do you use type-checking decorators? Maybe special object wrappers? Please share...

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• jQuery drag drop slower for more DIV items

  Hi there, I have got a hierarchichal tags (with parent child relationship) in my page and it will account to 500 - 4500 (can even grow). When i bound the draggable and droppable for all i saw very bad performance in IE7 and IE6. The custom helper wont move smoothly and was very very slow. Based on some other post i have made the droppable been bound/unbound on mouseover and mouseout events (dynamically). Its better now. But still i dont see the custom helper move very smoothly there is a gap between the mouse cursor and the helper when they move and gets very bad when i access the site from remote. Please help me to address this performance issue. Am totally stuck here.. :(

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• Writing a code example

  - by Stefano Borini

  I would like to have your feedback regarding code examples. One of the most frustrating experiences I sometimes have when learning a new technology is finding useless examples. I think an example as the most precious thing that comes with a new library, language, or technology. It must be a starting point, a wise and unadulterated explanation on how to achieve a given result. A perfect example must have the following characteristics: Self contained: it should be small enough to be compiled or executed as a single program, without dependencies or complex makefiles. An example is also a strong functional test if you correctly installed the new technology. The more issues could arise, the more likely is that something goes wrong, and the more difficult is to debug and solve the situation. Pertinent: it should demonstrate one, and only one, specific feature of your software/library, involving the minimal additional behavior from external libraries. Helpful: the code should bring you forward, step by step, using comments or self-documenting code. Extensible: the example code should be a small “framework” or blueprint for additional tinkering. A learner can start by adding features to this blueprint. Recyclable: it should be possible to extract parts of the example to use in your own code Easy: An example code is not the place to show your code-fu skillz. Keep it easy. helpful acronym: SPHERE. Prototypical examples of violations of those rules are the following: Violation of self-containedness: an example spanning multiple files without any real need for it. If your example is a python program, keep everything into a single module file. Don’t sub-modularize it. In Java, try to keep everything into a single class, unless you really must partition some entity into a meaningful object you need to pass around (and java mandates one class per file, if I remember correctly). Violation of Pertinency: When showing how many different shapes you can draw, adding radio buttons and complex controls with all the possible choices for point shapes is a bad idea. You de-focalize your example code, introducing code for event handling, controls initialization etc., and this is not part the feature you want to demonstrate, they are unnecessary noise in the understanding of the crucial mechanisms providing the feature. Violation of Helpfulness: code containing dubious naming, wrong comments, hacks, and functions longer than one page of code. Violation of Extensibility: badly factored code that have everything into a single function, with potentially swappable entities embedded within the code. Example: if an example reads data from a file and displays it, create a method getData() returning a useful entity, instead of opening the file raw and plotting the stuff. This way, if the user of the library needs to read data from a HTTP server instead, he just has to modify the getData() module and use the example almost as-is. Another violation of Extensibility comes if the example code is not under a fully liberal (e.g. MIT or BSD) license. Violation of Recyclability: when the code layout is so intermingled that is difficult to easily copy and paste parts of it and recycle them into another program. Again, licensing is also a factor. Violation of Easiness: Yes, you are a functional-programming nerd and want to show how cool you are by doing everything on a single line of map, filter and so on, but that could not be helpful to someone else, who is already under pressure to understand your library, and now has to understand your code as well. And in general, the final rule: if it takes more than 10 minutes to do the following: compile the code, run it, read the source, and understand it fully, it means that the example is not a good one. Please let me know your opinion, either positive or negative, or experience on this regard.

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• Looking for a better design: A readonly in-memory cache mechanism

  - by Dylan Lin

  Hi all, I have a Category entity (class), which has zero or one parent Category and many child Categories -- it's a tree structure. The Category data is stored in a RDBMS, so for better performance, I want to load all categories and cache them in memory while launching the applicaiton. Our system can have plugins, and we allow the plugin authors to access the Category Tree, but they should not modify the cached items and the tree(I think a non-readonly design might cause some subtle bugs in this senario), only the system knows when and how to refresh the tree. Here are some demo codes: public interface ITreeNode<T> where T : ITreeNode<T> { // No setter T Parent { get; } IEnumerable<T> ChildNodes { get; } } // This class is generated by O/R Mapping tool (e.g. Entity Framework) public class Category : EntityObject { public string Name { get; set; } } // Because Category is not stateless, so I create a cleaner view class for Category. // And this class is the Node Type of the Category Tree public class CategoryView : ITreeNode<CategoryView> { public string Name { get; private set; } #region ITreeNode Memebers public CategoryView Parent { get; private set; } private List<CategoryView> _childNodes; public IEnumerable<CategoryView> ChildNodes { return _childNodes; } #endregion public static CategoryView CreateFrom(Category category) { // here I can set the CategoryView.Name property } } So far so good. However, I want to make ITreeNode interface reuseable, and for some other types, the tree should not be readonly. We are not able to do this with the above readonly ITreeNode, so I want the ITreeNode to be like this: public interface ITreeNode<T> { // has setter T Parent { get; set; } // use ICollection<T> instead of IEnumerable<T> ICollection<T> ChildNodes { get; } } But if we make the ITreeNode writable, then we cannot make the Category Tree readonly, it's not good. So I think if we can do like this: public interface ITreeNode<T> { T Parent { get; } IEnumerable<T> ChildNodes { get; } } public interface IWritableTreeNode<T> : ITreeNode<T> { new T Parent { get; set; } new ICollection<T> ChildNodes { get; } } Is this good or bad? Are there some better designs? Thanks a lot! :)

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• [UIView didCreateWorkout:Type:Distance:Time:Message:]: unrecognized selector sent to instance.

  - by Stephen

  Hello, I'm getting the above error and have been looking at it all day, I'm getting no where fast. Anyone any ideas ? I'm new to IPhone Development. Code Below: #import "WorkoutViewController.h" #import "Workout.h" @implementation WorkoutViewController @synthesize workoutDelegate; //@synthesize Speed; //@synthesize Calories; @synthesize route; @synthesize type; @synthesize distance; @synthesize time; @synthesize message; @synthesize DBContents; @synthesize workoutArray; @synthesize managedObjectContext; //@synthesize saveWorkout; //@synthesize cancelWorkout; -(IBAction)hideKeyboard { } -(IBAction)saveWorkout { [workoutDelegate didCreateWorkout: route.text Type: type.text Distance: distance.text Time: time.text Message: message.text]; } -(IBAction)cancelWorkout { [self.workoutDelegate didCancelWorkout]; } // Implement viewDidLoad to do additional setup after loading the view, typically from a nib. -(void)viewDidLoad { //Set images for Save & Cancel buttons. UIImage *normalImage = [[UIImage imageNamed:@"whiteButton.png"] stretchableImageWithLeftCapWidth:12.0 topCapHeight:0.0]; [saveWorkout setBackgroundImage:normalImage forState:UIControlStateNormal]; [cancelWorkout setBackgroundImage:normalImage forState:UIControlStateNormal]; UIImage *pressedImage = [[UIImage imageNamed:@"blueButton.png"] stretchableImageWithLeftCapWidth:12.0 topCapHeight:0.0]; [saveWorkout setBackgroundImage:pressedImage forState:UIControlStateHighlighted]; [cancelWorkout setBackgroundImage:pressedImage forState:UIControlStateHighlighted]; //Fetch details from the database. NSFetchRequest *request = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"Workout" inManagedObjectContext:managedObjectContext]; [request setEntity:entity]; NSError *error; self.workoutArray = [[managedObjectContext executeFetchRequest:request error:&error] mutableCopy]; [request release]; //self.workoutArray = [[NSMutableArray alloc] init]; //self.DBContents.text = [self.workoutArray objectAtIndex:0]; [super viewDidLoad]; } -(void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Release any cached data, images, etc that aren't in use. } -(void)viewDidUnload { // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; } -(void) didCreateWorkout:(NSString *)thisRoute Type:(NSString *)thisType Distance:(NSString *)thisDistance Time:(NSString *)thisTime Message:(NSString *)thisMessage { // Add the new workout. Workout *newWorkout = [NSEntityDescription insertNewObjectForEntityForName:@"Workout" inManagedObjectContext:self.managedObjectContext]; newWorkout.route = thisRoute; newWorkout.type = thisType; newWorkout.distance = thisDistance; newWorkout.time = thisTime; newWorkout.message = thisMessage; [self.workoutArray addObject:newWorkout]; //[self dismissModalViewControllerAnimated:YES]; } -(void)didCancelWorkout { [self dismissModalViewControllerAnimated:YES]; } -(void)dealloc { // [Speed release]; // [Calories release]; [route release]; [type release]; [distance release]; [time release]; [message release]; // [saveWorkout release]; // [cancelWorkout release]; [workoutArray release]; [managedObjectContext release]; [super dealloc]; } @end I'm trying to save details that I key on the screen (WorkoutViewController.xib) and I click the save button and get the above error. Thanks Stephen

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• Blacklisting: IP's or domains?

  - by johnnietheblack

  I am implementing a blacklisting system on my website that monitors contact forms for suspicious usage (both spam content and excessive frequency). When I find somebody / robot that meets my criteria for blacklisting, I want to send them to my DB as a blacklisted entity. My question is, should I blacklist them as an IP or as a domain? As far as I can see, blacklisting an IP is going to be far more effective, because I allow people to enter their email address in the form, and they can easily just change their domain on a regular basis. However, the downside is that if I blacklist an IP, I could potentially be blacklisting a large group of people who share an IP, when only one person is bad (ie - college campuses, coffee shops, etc). Is there a solution I'm missing?

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• Many-to-Many Relationships in MySQL

  - by Kaji

  I've been reading up on foreign keys and joins recently, and have been pleasantly surprised that many of the basic concepts are things I'm already putting into practice. For example, with one project I'm currently working on, I'm organizing word lists, and have a table for the sets, like so: `words` Table `word_id` `headword` `category_id` `categories` Table `category_id` `category_name` Now, generally speaking this would be a one-to-many relationship, with several words being placed under a single category with the foreign key category_id. Let's assume for a moment, however, that a user chooses to add another category to a word, making it many-to-many—Is there a way to set up my words table to handle additional categories for words without creating extra columns like category_2, category_3, etc.?

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• CodeIgniter model debugging errors

  - by Jono

  I am new to CodeIgniter, and I need a way to get more meaningful error messages. Specifically I am having trouble with some model relationships, but the error is vague. I am willing to try/install anything since I dont know how to fix this relationship. Is there a way to specify how verbose an error message is? Also, this could be related to DataMapper, but I cant tell. I dont care if they are logged or in the browser. In my browser error reads: An Error Was Encountered Unable to relate X with Y. Any more info would be great... which class, line number, a stacktrace. Increasing the log threshold did not help.

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• Spring/Hibernate/Junit example of testing DAO against HSQLDB

  - by Ryan P.

  Hi guys, I'm working on trying to implement a JUnit test to check the functionality of a DAO. (The DAO will create/read a basic object/table relationship in HSQLDB). The trouble I'm having is the persistence of the DAO (for the non-test code) is being completed through an in-house solution using Spring/Hibernate, which eliminates the usual *.hbm.xml templates that most examples I have found contain. Beacuse of this, I'm having some trouble understanding how to setup a JUnit test to implement the DAO to create/read (just very basic funtionality) to an in-memory HSQLDB. I have found a few examples, but the usage of the in-house persistence means I can't extend some of the classes the examples show (I can't seem to get the application-context.xml setup properly). Can anyone suggest any projects/examples I could take a look at (or any documentation) to further my understanding of the best way to implement this test functionality? I feel like this should be really simple, but I keep running into problems implementing the examples I have found. Thanks in advance!

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• Finding distance travelled by robot using Optical Flow

  - by user280454

  Hi, I'm working on a project right now in which we are developing an autonomous robot. I have to basically find out the distance travelled by the robot between any 2 intervals. I'm using OpenCV, and using the Optical Flow functions of OpenCV, I'm able to find out the velocity/distance of each pixel in 2 different images. Using this information, I want to be able to find out the distance travelled by the robot in the interval between those 2 images. I thought of a way in which we could develop an input output mapping between the distance travelled by pixels and the distance travelled by the bot (using some tests). In this way, using neural networks, we would be able to find the relationship. However, the optical flow would depend on the distance of the camera from the pixel, which would cause problems. Is there any way to solve this problem?

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• Will this safely delete my record?

  - by Sergio Tapia

  I hate these three tables that. Two tables have a many to many relationship and as such it generates a third table. I'm using Linq-to-SQL and in the .dbml file I've dragged all the folder there to the graphic surface. Here is the method I'm using to delete an Area safely. Remember that documents are associated to an Area, so I can't just delete it and leave documents hanging. ScansDataContext db = new ScansDataContext(); /// <summary> /// Deletes an Area object from the database along with all associations in the database. /// </summary> /// <param name="area">Area object to save</param> public void Delete(Area area) { db.DocumentAreaRelations.DeleteAllOnSubmit(area.DocumentAreaRelations); db.Areas.DeleteOnSubmit(area); db.SubmitChanges(System.Data.Linq.ConflictMode.FailOnFirstConflict); }

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• How is my password sent across when I check gmails/access bank site [closed]

  - by learnerforever

  What encryption is used when my password is sent across in gmails/when I do online banking? RSA? DSA? Public-private key encryption?. In key encryption, which entity is assigned a public/private key? Does each unique machine with unique MAC address has a unique public/private key? Does each instance of browser have unique key? Does each user have unique private/public key? How does session key come into picture? How do machines receive their keys?

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• Buddy List: Relational Database Table Design

  - by huntaub

  So, the modern concept of the buddy list: Let's say we have a table called Person. Now, that Person needs to have many buddies (of which each buddy is also in the person class). The most obvious way to construct a relationship would be through a join table. i.e. buddyID person1_id person2_id 0 1 2 1 3 6 But, when a user wants to see their buddy list, the program would have to check the column 'person1_id' and 'person2_id' to find all of their buddies. Is this the appropriate way to implement this kind of table, or would it be better to add the record twice.. i.e. buddyID person1_id person2_id 0 1 2 1 2 1 So that only one column has to be searched. Thanks in advance.

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• bi-directional o2m/m2o beats uni-directional o2m in SQL efficiency?

  - by Henry

  Use these 2 persistent CFCs for example: // Cat.cfc component persistent="true" { property name="id" fieldtype="id" generator="native"; property name="name"; } // Owner.cfc component persistent="true" { property name="id" fieldtype="id" generator="native"; property name="cats" type="array" fieldtype="one-to-many" cfc="cat" cascade="all"; } When one-to-many (unidirectional) Note: inverse=true on unidirectional will yield undesired result: insert into cat (name) values (?) insert into Owner default values update cat set Owner_id=? where id=? When one-to-many/many-to-one (bi-directional, inverse=true on Owner.cats): insert into Owner default values insert into cat (name, ownerId) values (?, ?) Does that mean setting up bi-directional o2m/m2o relationship is preferred 'cause the SQL for inserting the entities is more efficient?

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• RAID-0 problem with a Sony sporting a new HDD

  - by redrock

  Sony Windows 7 PC. Originally had 2 x 300 Gb HDD. One HDD completely pancaked so have replaced with a new 500 Gb HDD. When both drives are connected the 300GB doesn't appear to be recognized as a 300Gb HDD as a separate entity. BIOS sees it but the operating system only sees a total of 465GB of HD space. When both disks are attached under disk management it shows one 465Gb as RAID 0 and the new drive as STxxxxxx 465Gb. My question I guess is what should I see in total HDD space and is this configured correctly as I thought I would see 2 separate drives 1x500Gb and 1x300Gb. My customer insisted that prior to the HDD crash he saw 2 drives both registering as 300Gb (a c: and d: drive).

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• JPA IndirectSet changes not reflected in Spring frontend

  - by Jon

  I'm having an issue with Spring JPA and IndirectSets. I have two entities, Parent and Child, defined below. I have a Spring form in which I'm trying to create a new Child and link it to an existing Parent, then have everything reflected in the database and in the web interface. What's happening is that it gets put into the database, but the UI doesn't seem to agree. The two entities that are linked to each other in a OneToMany relationship like so: @Entity @Table(name = "parent", catalog = "myschema", uniqueConstraints = @UniqueConstraint(columnNames = "ChildLinkID")) public class Parent { private Integer id; private String childLinkID; private Set<Child> children = new HashSet<Child>(0); @Id @GeneratedValue(strategy = IDENTITY) @Column(name = "id", unique = true, nullable = false) public Integer getId() { return this.id; } public void setId(Integer id) { this.id = id; } @Column(name = "ChildLinkID", unique = true, nullable = false, length = 6) public String getChildLinkID() { return this.childLinkID; } public void setChildLinkID(String childLinkID) { this.childLinkID = childLinkID; } @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "parent") public Set<Child> getChildren() { return this.children; } public void setChildren(Set<Child> children) { this.children = children; } } @Entity @Table(name = "child", catalog = "myschema") public class Child extends private Integer id; private Parent parent; @Id @GeneratedValue(strategy = IDENTITY) @Column(name = "id", unique = true, nullable = false) public Integer getId() { return this.id; } public void setId(Integer id) { this.id = id; } @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "ChildLinkID", referencedColumnName = "ChildLinkID", nullable = false) public Parent getParent() { return this.parent; } public void setParent(Parent parent) { this.parent = parent; } } And of course, assorted simple properties on each of them. Now, the problem is that when I edit those simple properties from my Spring interface, everything works beautifully. I can persist new entities of these types and they'll appear when using the JPATemplate to do a find on, say, all Parents (getJpaTemplate().find("select p from Parent p")) or on individual entities by ID or another property. The problem I'm running into is that now, I'm trying to create a new Child linked to an existing Parent through a link from the Parent's page. Here's the important bits of the Controller (note that I've placed the JPA foo in the controller here to make it clearer; the actual JpaDaoSupport is actually in another class, appropriately tiered): protected Object formBackingObject(HttpServletRequest request) throws Exception { String parentArg = request.getParameter("parent"); int parentId = Integer.parseInt(parentArg); Parent parent = getJpaTemplate().find(Parent.class, parentId); Child child = new Child(); child.setParent(parent); NewChildCommand command = new NewChildCommand(); command.setChild(child); return command; } protected ModelAndView onSubmit(Object cmd) throws Exception { NewChildCommand command = (NewChildCommand)cmd; Child child = command.getChild(); child.getParent().getChildren().add(child); getJpaTemplate().merge(child); return new ModelAndView(new RedirectView(getSuccessView())); } Like I said, I can run through the form and fill in the new values for the Child -- the Parent's details aren't even displayed. When it gets back to the controller, it goes through and saves it to the underlying database, but the interface never reflects it. Once I restart the app, it's all there and populated appropriately. What can I do to clear this up? I've tried to call extra merges, tried refreshes (which gave a transaction exception), everything short of just writing my own database access code. I've made sure that every class has an appropriate equals() and hashCode(), have full JPA debugging on to see that it's making appropriate SQL calls (it doesn't seem to make any new calls to the Child table) and stepped through in the debugger (it's all in IndirectSets, as expected, and between saving and displaying the Parent the object takes on a new memory address). What's my next step?

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• MYSQL Event to update another database table

  - by Lee

  Hey All, I have just taken over a project for a client and the database schema is in a total mess. I would like to rename a load of fields make it a relationship database. But doing this will be a painstaking process as they have an API running of it also. So the idea would be to create a new database and start re-writing the code to use this instead. But I need a way to keep these tables in sync during this process. Would you agree that I should use MYSQL EVENT's to keep updating the new table on Inserts / updates & deletes?? Or can you suggest a better way?? Hope you can advise !! thanks for any input I get

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• How to specify an association relation using declarative base

  - by sam

  I have been trying to create an association relation between two tables, intake and module . Each intake has a one-to-many relationship with the modules. However there is a coursework assigned to each module, and each coursework has a duedate which is unique to each intake. I tried this but it didnt work: intake_modules_table = Table('tg_intakemodules',metadata, Column('intake_id',Integer,ForeignKey('tg_intake.intake_id', onupdate="CASCADE",ondelete="CASCADE")), Column('module_id',Integer,ForeignKey('tg_module.module_id', onupdate ="CASCADE",ondelete="CASCADE")), Column('dueddate', Unicode(16)) ) class Intake(DeclarativeBase): __tablename__ = 'tg_intake' #{ Columns intake_id = Column(Integer, autoincrement=True, primary_key=True) code = Column(Unicode(16)) commencement = Column(DateTime) completion = Column(DateTime) #{ Special methods def __repr__(self): return '"%s"' %self.code def __unicode__(self): return self.code #} class Module(DeclarativeBase): __tablename__ ='tg_module' #{ Columns module_id = Column(Integer, autoincrement=True, primary_key=True) code = Column(Unicode(16)) title = Column(Unicode(30)) #{ relations intakes = relation('Intake', secondary=intake_modules_table, backref='modules') #{ Special methods def __repr__(self): return '"%s"'%self.title def __unicode__(self): return '"%s"'%self.title #} When I do this the column duedate specified in the intake_module_table is not created. Please some help will be appreciated here. thanks in advance

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