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• Multiple ID's in database

  - by eric

  I have a database that contains a few tables such as person, staff, member, and supporter. The person table contains information about every staff, member, and supporter. The information it contains is name,address,email, and telephone. I also created an id that is the primary key. My issue is that I also have an primary key ID for staff, member, and supporter. For instance, in the person table is John with id 1. He is a supporter so in the supporter table is pID(for person id)to reference back to John with all his information and ID(for supporter ID). pID references to the person table and every person has an ID incremented by 1 starting at 1. supporter ID is for every supporter and also starts at 1 and is incremented by 1. Is it possible to have in the supporter table pID = 1 and supporter ID = 1? Another person may have a pID = 26 and supporter ID = 5. Or will supporter ID have to be different than the pID and be something like "sup"? So you would have pID = 1 and supporter ID = sup1 or pID = 26 and supporter ID = sup5

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• 12.04 LTS: unity --reset hangs

  - by Gregory R. Pace

  Nearly each time I reboot my machine, the system panel and integrated app menus fail to load. At a terminal, when issuing 'unity --reset', I get the following errors: ... Initializing widget options...done Initializing winrules options...done Initializing wobbly options...done ERROR 2012-11-05 04:36:48 unity.glib-gobject <unknown>:0 g_object_unref: assertion `G_IS_OBJECT (object)' failed ERROR 2012-11-05 04:36:48 unity.gtk <unknown>:0 gtk_window_resize: assertion `width > 0' failed WARN 2012-11-05 04:37:14 unity <unknown>:0 Unable to fetch children: No such interface `org.ayatana.bamf.view' on object at path /org/ayatana/bamf/application885622223 ERROR 2012-11-05 04:37:21 unity.glib-gobject <unknown>:0 g_object_set_qdata: assertion `G_IS_OBJECT (object)' failed Setting Update "main_menu_key" Setting Update "run_key" WARN 2012-11-05 04:38:06 unity.iconloader IconLoader.cpp:438 Unable to load icon stock-person at size 24 WARN 2012-11-05 04:38:26 unity.glib.dbusproxy GLibDBusProxy.cpp:182 Unable to connect to proxy: Error calling StartServiceByName for com.canonical.Unity.Lens.Applications: Timeout was reached WARN 2012-11-05 04:38:26 unity.glib.dbusproxy GLibDBusProxy.cpp:182 Unable to connect to proxy: Error calling StartServiceByName for com.canonical.Unity.Lens.Applications: Timeout was reached The procedure hangs at this point. Any ideas how to solve these problems ? Thanks in advance.

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• Unity 3D hangs after power blackout

  - by Yusuf

  Unity 3D was working just fine till we had a blackout in the area (I have not yet bought a UPS :(). I tried the solutions here, but it does not help. I tried issuing a unity --reset and it gives me this output: http://pastebin.com/UW83w5cG What seems to be important (to me) from that log is this part: (compiz:6510): GConf-CRITICAL **: gconf_client_add_dir: assertion `gconf_valid_key (dirname, NULL)' failed ERROR 2012-05-29 21:50:41 unity.launcher.trashlaunchericon TrashLauncherIcon.cpp:62 Could not create file monitor for trash uri: Operation not supported For the time being, I can use Unity-2D, but I would like the 3D to work as well. Can you please help? Edit: Output when issuing $ unity --replace: http://pastebin.com/sBCPbyrT (compiz:2811): GConf-CRITICAL **: gconf_client_add_dir: assertion `gconf_valid_key (dirname, NULL)' failed ERROR 2012-06-01 20:21:24 unity.launcher.trashlaunchericon TrashLauncherIcon.cpp:62 Could not create file monitor for trash uri: Operation not supported Initializing unityshell options...done WARN 2012-06-01 20:21:25 unity.screeneffectframebufferobject ScreenEffectFramebufferObject.cpp:167 unsupported internal format Segmentation fault (core dumped)

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• How do I compile lbflow 1.1?

  - by Ali.A

  After using "sh ./configure" command, I encountered another error during lbflow package installation (a scientific one). The sequence of operations is here with error: ./configure --disable-gts sudo make [sudo] password for alireza: make all-recursive make[1]: Entering directory `/home/alireza/lbflow-1.1' Making all in src make[2]: Entering directory `/home/alireza/lbflow-1.1/src' source='lbflow.cpp' object='lbflow-lbflow.o' libtool=no \ DEPDIR=.deps depmode=none /bin/bash ../depcomp \ g++ -DHAVE_CONFIG_H -I. -I. -I.. -c -o lbflow-lbflow.o `test -f 'lbflow.cpp' || echo './'`lbflow.cpp **../depcomp: line 432: exec: g++: not found** **make[2]: *** [lbflow-lbflow.o] Error 127 make[2]: Leaving directory `/home/alireza/lbflow-1.1/src' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/home/alireza/lbflow-1.1' make: *** [all] Error 2** Do you have any idea to troubleshoot this problem? (And please notice that i have installed both g++ and gcc. it says g++: not found, but i have installed g++ from Ubuntu Software Center!)

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• Class design, One class in two sources

  - by Pavla

  Is it possible define methods from the same class in different "CPP" files? I have header file "myClass.h" with: class myClass { public: // methods for counting ... // methods for other ... }; I would like to define "methods for counting" in one CPP and "methods for other" in other CPP. For clarity. Both groups of methods sometime use the same attributes. Is it possible? Thanks :).

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• g++ cannot find include files (qt3)

  - by Allan

  allan@allan-VirtualBox:~/blackjack_for_the_hopelessly_luckless$ make g++ -c -pipe -g -Wall -W -O2 -D_REENTRANT -DQT_NO_DEBUG -DQT_THREAD_SUPPORT -DQT_SHARED -DQT_TABLET_SUPPORT -I/usr/share/qt3/mkspecs/default -I. -I. -I/usr/include/qt3 -o advicewindow.o advicewindow.cpp advicewindow.cpp:32:19: fatal error: QWidget: No such file or directory compilation terminated. make: *** [advicewindow.o] Error 1 allan@allan-VirtualBox:~/blackjack_for_the_hopelessly_luckless$ qt3 was installed using apt-get. Header files are located in /usr/include/qt3/ Is there a g++ config file or something I need to update? I'm new to compiling from source and not sure what to do. Makefile was created using Qmake from project file. Files in include directory are all lower case, should I change the code in advicewindow.cpp to qwidget.h? Any help appreciated. Thanks.

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• Why can't mythtv backend see my HDHomeRun tuner?

  - by Jeff

  Ran a fresh install of Mythbuntu 12.04.1 32 bit. Went through the backend setup and was able to see my HDHomeRun Prime (HDHR3) device, scan, and detect channels. Cannot get to live TV on frontend. Backend log seems to indicate it's not detecting my tuner, even though I configured it in the setup. Sep 8 15:03:33 Dimension-8300 mythbackend[1668]: E TVRecEvent dtvmultiplex.cpp:325 (ParseTuningParams) DTVMux: ParseTuningParams -- Unknown tuner type = 0x2000 Sep 8 15:03:33 Dimension-8300 mythbackend[1668]: E TVRecEvent dtvchannel.cpp:308 (SetChannelByString) DTVChan(192.168.1.12-0): SetChannelByString(3_1): Failed to initialize multiplex options Sep 8 15:03:33 Dimension-8300 mythbackend[1668]: E TVRecEvent tv_rec.cpp:3681 (TuningFrequency) TVRec(1): Failed to set channel to 3_1. Reverting to kState_None

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• Share Mulitple Classes as one dll or a lib with Mulitple Projects

  - by JNL

  Currently I have some shared class files(.cpp and .h) which I include them in around 20 Projects. Currently I have to include them in all of the projects. So if I get some business requirments and I change some of the shared(.cpp or .h) files I have to include them in all the 20 Projects which is kind of tedious. Is there a way where I can create a shared dll or library and include it all of my Projects. So if I have to change it, I just have to change it once and then just Add Reference to include that dll or library which contains all the shared(.cpp, .h) files. Any help/recommendations regarding the same, will be highly appreciated. I am using VS2012 for VC++.

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• Is there any simple C++ code to grab video from UVC webcam and display it simultaneously?

  - by mShero

  I'm very very new to Linux and programming! I'm using ubuntu 11.10 - 64 bits with gcc 4.6.1 I've been searching online for an example C++ code that simply grabs video from a compliant UVC webcam and displays it simultaneously.. I need to compile it on gcc. In OpenCV, it's a very simple code less than 20 lines as I remember! I found this: http://v4l2spec.bytesex.org/spec/capture-example.html But it's very huge code relative to OpenCV code ?! and even when I tried to compile it using gcc.. I got many errors! I copied the code into a cpp file: cap.cpp then wrote in the terminal: gcc cap.cpp -o cap and the errors showed up... same errors with g++ I hope if someone can help me and tell me where can I find another simpler code? and how can I test it ? Thank you :)

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• Compare NSArray with NSMutableArray adding delta objects to NSMutableArray

  - by Hooligancat

  I have an NSMutableArray that is populated with objects of strings. For simplicity sake we'll say that the objects are a person and each person object contains information about that person. Thus I would have an NSMutableArray that is populated with person objects: person.firstName person.lastName person.age person.height And so on. The initial source of data comes from a web server and is populated when my application loads and completes it's initialization with the server. Periodically my application polls the server for the latest list of names. Currently I am creating an NSArray of the result set, emptying the NSMutableArray and then re-populating the NSMutableArray with NSArray results before destroying the NSArray object. This seems inefficient to me on a few levels and also presents me with a problem losing table row references which I can work around, but might be creating more work for myself in doing so. The inefficiency seems to be that I should be able to compare the two arrays and end up with a filtered NSArray. I could then add the filtered set to the NSMutableArray. This would mean that I can simply append new data to the NSMutableArray instead of throwing everything out and re-populating. Conversely I would need to do the same filter in reverse to see if there are records that need removing from the NSMutableArray. Is there any method to do this in a more efficient manner? Have I overlooked something in the docs some place that refers to a simpler technique? I have a problem when I empty the NSMutableArray and re-populate in that any referencing tables lose their selected row state. I can track it and re-select it, but my theory is that using some form of compare and adding objects and removing objects instead of dealing with the whole array in one block might mean I keep my row reference (assuming the item isn't deleted of course). Any suggestions or help much appreciated. Update Would it be just as fast to do a fast enumeration over each comparing each line item as I go? It seems like an expensive operation, but with the last fast enumeration code it might be pretty efficient...

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• django: CheckboxMultiSelect problem with db queries

  - by xiackok

  firstly sorry for my bad english there is a simple model Person. That contains just languages: LANGUAGE_LIS = ( (1, 'English'), (2, 'Turkish'), (3, 'Spanish') ) class Person(models.Model): languages = models.CharField(max_length=100, choices=LANGUAGE_LIST) #languages is multi value (CheckBoxSelectMultiple) and here person_save_form: class person_save_form(forms.ModelForm): languages = forms.CharField(widget=forms.CheckBoxSelectMultiple(choices=LANGUAGE_LIST)) class Meta: model = Person it is ok. but how can i search persons for languages like "get persons who knows turkish and english" in the database (MySQL) record "languages" column seen like "[u'1', u'2']". but i want search persons like this: persons = Person.objects.filter(languages__in=request.POST.getlist('languages'))

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• creating Object equality "HashMap" in ActionScript3 as java HashMap

  - by jason

  const jonny1 : Person = new Person("jonny", 26); const jonny2 : Person = new Person("jonny", 26); const table : Dictionary = new Dictionary(); table[jonny1] = "That's me"; trace(table[jonny1]) // traces: "That's me" trace(table[jonny2]) // traces: undefined. But I want use Dictionary like this way: trace(table[jonny2]) // traces: "That's me". in a word, I want implements a data-structure works like HashMap in java

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• Variable naming for arrays - C#

  - by David Neale

  What should I call a variable instantiated with some type of array? Is it okay to simply use a pluralised form of the type being held? IList<Person> people = new List<Person>(); or should I append something like 'List' to the name? IList<Person> personList = new List<Person>();

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• How To Save Spring Security Logged In User In Session

  - by Brad Rhoads

  This code get's the currently logged in user, using the Spring Security Plugin (acegi): def principalInfo = authenticateService.principal() def person = null if (principalInfo != "anonymousUser" && principalInfo.username) { person = Person.findByUsername(principalInfo.username) } I would like then do: session.user = person This needs to be done after the user logs in. I can't figure out where to put my code to do this. It seem like it should be some place in the Login Controller, but I can't see where.

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• Help writing database queries for derby?

  - by outsyncof

  I have a database containing multiple tables (Person, Parents, etc) Person table has certain attributes particularly ssn, countryofbirth and currentcountry. Parents table has ssn, and fathersbirthcountry I'm trying to output the SSNs of all people who have the same countryofbirth as their fathersbirthcountry and also have same currentcountry as fathersbirthcountry. SELECT Person.ssn FROM Person, Parents WHERE fathersbirthcountry = countryofbirth AND currentcountry = fathersbirthcountry; the above doesn't seem to be working, could anyone please help me out?

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• Why does this Grails/HQL query with a JOIN return Lists of pairs of domain classes?

  - by ?????

  I'm having trouble figuring out how to do a "join" in Groovy/Grails and the return values I get person = User.get(user.id) def latestPhotosForUser = PhotoOwner.findAll("FROM PhotoOwner AS a, PhotoStorage AS b WHERE (a.owner=:person AND a.photo = b)", [person:person], [max:3]) latestPhotosForUser isn't a list of PhotoOwners. It's a list of [PhotoOwner, PhotoStorage] pairs. Since I'm doing a PhotoOwner.findAll, I would have expected to see only PhotoOwners. Am I doing something wrong, or is this the proper behavior?

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• How to map EnumSet (or List of Enums) in an entity using JPA2

  - by arteq007

  I have entity Person: @Entity @Table(schema="", name="PERSON") public class Person { List<PaymentType> paymentTypesList; //some other fields //getters and setters and other logic } and I have enum PaymentType: public enum PaymentType { FIXED, CO_FINANCED, DETERMINED; } how to persist Person and its list of enums (in this list i have to place variable amount of enums, there may be one of them, or two or all of them) I'm using Spring with Postgres, Entity are created using JPA annotation, and managed using Hibernate

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• What are the benefits of left outer join vs nested aggregate selects to find the newest rows in a table?

  - by RenderIn

  I'm doing: select * from mytable y where y.year = (select max(yi.year) from mytable yi where yi.person = y.person) Is that better or worse from a performance aspect than: select y.* from mytable y left outer join mytable y2 on y.year < y2.year and y.person = y2.person where y2.year is null The explain plan/anecdotal evidence is inconclusive so I am wondering if in general one is better than the other.

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• Need help with SQL Query

  - by StackOverflowNewbie

  Say I have 2 tables: Person - Id - Name PersonAttribute - Id - PersonId - Name - Value Further, let's say that each person had 2 attributes (say, gender and age). A sample record would be like this: Person->Id = 1 Person->Name = 'John Doe' PersonAttribute->Id = 1 PersonAttribute->PersonId = 1 PersonAttribute->Name = 'Gender' PersonAttribute->Value = 'Male' PersonAttribute->Id = 2 PersonAttribute->PersonId = 1 PersonAttribute->Name = 'Age' PersonAttribute->Value = '30' Question: how do I query this such that I get a result like this: 'John Doe', 'Male', '30'

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• Multiple select statement in stored procedure

  - by GigaPr

  Hi, i have a stored procedure that has to retrieve data from multiple tables something like SELECT [AppointmentId] ,[ContactId] ,[Date] ,[BookedBy] ,[Details] ,[Status] ,[Time] ,[Type] ,[JobId] ,[AppointmentFor] ,(Select PersonFirstName from Person where Person_Id = [AppointmentFor]) As UserFirstName ,(Select PersonLastName from Person where Person_Id = [AppointmentFor]) As UserLastName ,(Select PersonFirstName from Person where Person_Id = [ContactId]) As ContactFirstName ,(Select PersonLastName from Person where Person_Id = [ContactId]) As ContactLastName FROM [dbo].[Appointments] my question is there is any other more efficient way to do this? Or is this the right approach? I am working on a Sql server 2008 Thanks

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• Hibernate Criteria - Exclude records with same id but different attribute values

  - by Aris

  Hi, I'm trying to find records where status = "a" for a Person but exclude records where the same person has another record with a status="b" SELECT * FROM Person WHERE STATUS = 'a' AND Person_id NOT IN (SELECT Person_id FROM Person WHERE STATUS = 'b' AND Person_id IS NOT NULL) Appreciate the help

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• Remove events without knowing their names

  - by Carlo

  Is it possible to instead of doing this: person.Walking -= person_Walking1; person.Walking -= person_Walking2; person.Walking -= person_Walking3; Do this: person.Walking = // remove all the handlers without knowing their names Thanks.

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• How to start a Python script several functions in

  - by chrissygormley

  Hello, I have a Python script and I want to call it several functions down the script. Example code below: class Name(): def __init__(self): self.name = 'John' self.address = 'Place' self.age = '100' def printName(self): print self.name def printAddress(self): print self.address def printAge(self): print self.age if __name__ == '__main__': Person = Name() Person.printName() Person.printAddress() Person.printage() I execute this code by entering ./name.py. How could I exectute this code from the function printAddress() down the the end of the script? Thanks

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• How to Update the primary key of table which is referenced as foreign key in another table?

  - by Mobin

  Suppose a Table "Person" having columns "SSN","Name","Address" and another Table "Contacts" having "Contact_ID","Contact_Type","SSN"(primary key of Person) similarly Table "Records" having "Record_ID","Record_Type","SSN"(primary key of Person) Now i want that when i change or update SSN in person table that accordingly changes in other 2 tables. If anyone can help me with a trigger for that Or how to pass foreign key constraints for tables

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• An inaccessible class. VS2010.

  - by Mishgun_

  I realy dont know what the problem is with VS2010. I created a class, and when I'm trying create an exemplar of the class I get an error: "Error xxx is inaccessible due to its protection level. Example: public class Person { Person(string name, int age) { this.name = name; this.age = age; } public string name; public int age; } class Program { static void Main(string[] args) { Person ps = new Person("Jack", 19); } }

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