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  • What are some useful SQL statements / usage patterns that should be known by all developers who may

    - by Jian Lin
    What are some useful SQL statements that should be known by all developers who may touch the Back end side of the project? (Update: just like in algorithm, we know there are sorting problems, shuffling problems, and we know some solutions to them. This question is aiming at the same thing). For example, ones I can think of are: Get a list of Employees and their boss. Or one with the employee's salary greater than the boss. (Self-join) Get a list of the most popular Classes registered by students, from the greatest number to the smallest. (Count, group by, order by) Get a list of Classes that are not registered by any students. (Outer join and check whether the match is NULL, or by Get from Classes table, all ClassIDs which are NOT IN (a subquery to get all ClassIDs from the Registrations table)) Are there some SQL statements that should be under the sleeve of all developers that might touch back end data?

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  • Git: can I store known repositories along the repository?

    - by 0x6adb015
    I am setting up a Git repository. I know you can add repositories using git config --global, but is there a way that those known repositories gets cloned by users? The goal would be that once the repo gets cloned by userz, they can push to other repos just by their aliases. For example, I add git://X/mobility.git as X to the repo (somehow), a user clone it from git://Y, but then can do git push X without previously doing the git config. How to do that?

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  • Ip doesn't change when switching networks, although automatic ip is set. Cause of the issue known

    - by Julio Acevedo
    I have two routers at my house. Both of them have DCHP server enabled. One of them is 192.168.1.1 and gives adresses from 192.168.1.2 to 192.168.1.32 The other one is 192.168.1.50 and gives adresses from 192.168.1.51 to 192.168.1.99 The problem is that I only have internet access in one because my ip is 192.168.1.7, and when I switch to the other one, the ip remains 192.168.1.7, even though I have automatically get a ip adress in Ipv4. When I manually change my ip to one in the range allowed by the router, I can browse the internet. Any ideas how to solve this? Thank you.

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  • File corrupted by some tools (probably virus or antivirus)- does the pattern indicate any known corruptions?

    - by StackTrace
    As part of our software we install postgres(windows). In one of the customer sites, a set of files got corrupted. All files were part of timezone information(postgres/share/timezone). They are some sort of binary files. After the corruption, they all starts with following pattern od -tac output $ od -tac GMT 0000000 can esc etx sub nak dle em | nl em so | o r l _ 030 033 003 032 025 020 031 | \n 031 016 | o r l _ 0000020 \ \ \ \ \ \ \ del 3 fs ] del del del del del \ \ \ \ \ \ \ 377 3 034 ] 377 377 377 377 377 0000040 > ack r v s ack p soh q h r s q w h q 276 206 362 366 363 206 360 201 361 350 362 363 361 367 350 361 0000060 t r ack h eot s } v h | etx p eot ack nul } 364 362 206 350 204 363 375 366 350 374 203 360 204 206 200 375 0000100 | q t s t 8 E E E E E E E E E E 374 361 364 363 364 270 305 305 305 305 305 305 305 305 305 305 0000120 E E E E E E E E E E E E E E E E 305 305 305 305 305 305 305 305 305 305 305 305 305 305 305 305 * 0000240 m ; z dc3 7 sub c can em a u 5 can d 2 B 355 ; z 023 267 232 343 230 031 a u 5 230 d 262 302 0000260 X nul y J o S - 9 ] stx soh L can 1 ! j 330 \0 y 312 o S 255 9 335 202 001 314 030 261 241 j 0000300 dle g o etb n ff em ] 9 F ' dc4 } , em $ 020 g 357 227 n \f 231 ] 271 F 247 024 375 254 231 244 0000320 Q si ff L bs 2 # stx i 5 r % | | c del Q 017 214 314 210 2 # 002 351 5 362 245 374 374 343 177 0000340 m C esc H em enq ~ X o V p / l dc3 N sp m C 033 H 031 205 376 X o 326 360 257 l 023 N 0000360 } ) enq ( syn ! 3 s $ E z dc3 A dc3 ff P

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  • Do you known a reputable backup software that can capture ONLY file system structure + attributes, WITHOUT file content

    - by bogdan
    Is there, on Windows, a reputable backup software out there capable of capturing ONLY a file system's directory and file structure, along with each item's attributes, WITHOUT capturing the actual file content (all files should be zero-length in the backup). I thoroughly searched the web for a solution and wasn't able to find one. Scenario when this would be very useful: I have a large drive with a huge amount of files. If the drive dies, I don't care so much about the content in these files (I can always download this content again from the Internet at any time) but I do care HUGELY about the names of the files that were on it, possibly also about their MD5 hashes and other classic file attributes (especially created-date / modified-date). The functionality I need is present to an extent in "media"/file cataloging software (i.e. whereisit) and, to a lesser extent, in a Total Commander set of extensions (DiskDir, DiskDirExtended). The huge drawback with cataloging software is that it's not designed to store previous versions of each item (AFAIK) and, most importantly, it has very weak content backup capabilities. I managed to think of a hack but I hope there's some backup software out there that already has this capability and I just failed to find it, thus this question. The hack: RoboCopy could be used with /CREATE (CREATE directory tree and zero-length files only) or /COPY (what to COPY for files) without the D=Data flag, to clone a directory structure into one where all files are zero-length but have the desired attributes. Then I would backup the cloned directory structure with a reputable backup software. I would really love to avoid a hack like this one, if possible. Thanks, Bogdan

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  • Hiding a HTTP Auth-Realm by sending 404 to non-known IPs?

    - by zhenech
    I have an Apache (2.2) serving a web-app on example.com. That web-app has a debug-page reachable via example.com/debug. /debug is currently protected with a HTTP basic auth. As there is only a very small user-base who has access to the debug-page, I would like to hide it based on IP address and return 404 to clients not accessing from our VPN. Serving a 404 based on IP-address only is easy and is described in http://serverfault.com/a/13071. But as soon I add authentication, the users see a 401 instead of a 404. Basically, what I need is: if ($REMOTE_ADDR ~ 10.11.12.*): do_basic_auth (aka return 401) else: return 404

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  • How can I avoid SSH's host verification for known hosts?

    - by shantanuo
    I get the following prompt everytime I try to connect a server using SSH. I type "yes", but is there a way to aovid this? The authenticity of host '111.222.333.444 (111.222.333.444)' can't be established. RSA key fingerprint is f3:cf:58:ae:71:0b:c8:04:6f:34:a3:b2:e4:1e:0c:8b. Are you sure you want to continue connecting (yes/no)?

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  • For the .com TLD, is there any known change tracking for WhoIs information?

    - by makerofthings7
    A client exposed information regarding what will become a controversial website in the domain WhoIs after she purchased it from auction. Is there any whois cache that will detect, save, and share the old whois information for that domain, after it has changed? (It's a website to provide birth control in countries where it is banned, and she may receive death threats for the information shared on it. Obviously something she wishes to avoid.)

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  • What are your favourite less well known keyboard shortcuts in Windows?

    - by Richard Szalay
    The title says it all. Here are a few of my favourites to get things started: WINDOWS + BREAK - System Properties CTRL + SHIFT + ESC - Task Manager SHIFT + F10 - Context Menu (on keyboards without a CM key) And general text selection: HOME/END - Go to the start/end of the current line CTRL + HOME/END - Go to the start/end of the document CTRL + LEFT/RIGHT - Skip entire words SHIFT + CTRL + LEFT/RIGHT - Select entire words Edit: Just remembered this one SHIFT + DEL - Delete file (skip recycle bin)

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  • What naming pattern can I use for sequential file naming (photos) when only their relative sequence is known?

    - by Juhele
    I got some old scanned photos and I want to put them in correct order. Unfortunately, I have no possibility to find out the exact order, only relative one like: "hm, this photo was surely taken after this one" and organize them step-by-step by manually changing numbering again and again. Is there any program (best free or opensource), where could I interactively put the photo in correct order straightaway (maybe by changing the order by dragging with mouse) and finally apply some file renaming to keep the file order? thank you in advance PS: running Windows (XP and 7), but if you know something for linux, let me kno too, please

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  • Are there any well known anti-patterns in the field of system administration?

    - by ojblass
    I know a few common patterns that seem to bedevil nearly every project at some point in its life cycle: Inability to take outages Third party components locking out upgrades Non uniform environments Lack of monitoring and alerting Missing redundancy Lack of Capacity Poor Change Management Too liberal or tight access policies Organizational changes adversely blur infrastructure ownership I was hoping there is some well articulated library of these anti-patterns summarized in a book or web site. I am almost positive that many organizations are learning through trial by fire methods. If not let's start one.

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  • Can I remove a RAR file's (known) password without recompressing the archive?

    - by Abluescarab
    Long title. Anyway, I haven't been able to find an answer to this question. I know the password to the RAR file, I locked it myself, but now all I want to do is remove the password because it's too much of a pain in the butt to type it in every time. Is there a way to do this in WinRAR or an equivalent program? The only thing I knew to do was to extract it, then create a new RAR without the password. It's not a life-or-death issue, but it would be nice to know. Thanks for your time! EDIT: I just saw a bunch of related questions that appear to ask the same thing. The only solution I saw was using a DOS command to yadda yadda yadda. Here it is: How to remove password protection from compressed files Is there an easier way? Thanks again!

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  • Are there any known issues with Windows-8 installed on a VHD?

    - by Richard
    I installed Windows 8 preview on a VHD image and it seemed to work until I actually started using it. I´m seeing terrible performance. Installing anything makes everything else "stutter" or freeze for up to a couple of seconds at a time. I looked up hard disk performance in the task manager and this is what I found: It doesn't seem right it has 2500ms response time while reading/writing at those speeds. Is this an issue with my drive, installation or VHDs in general?

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  • Architectural and Design Challenges with SOA

    With all of the hype about service oriented architecture (SOA) primarily through the use of web services, not much has been said about potential issues of using SOA in the design of an application. I am personally a fan of SOA, but it is not the solution for every application. Proper evaluation should be done on all requirements and use cases prior to deciding to go down the SOA road. It is important to consider how your application/service will handle the following perils as it executes. Example Challenges of SOA Network Connectivity Issues Handling Connectivity Issues Longer Processing/Transaction Times How many of us have had issues visiting our favorite web sites from time to time? The same issue will occur when using service based architecture especially if it is implemented using web services. Forcing applications to access services via a network connection introduces a lot of new failure points to the application. Potential failure points include: DNS issues, network hardware issues, remote server issues, and the lack of physical network connections. When network connectivity issues do occur, how are the service clients are implemented is very important. Should the client wait and poll the service until it is accessible again? If so what is the maximum wait time or number of attempts it should retry. Due to the fact of services being distributed across a network automatically increase the responsiveness of client applications due to the fact that processing time must now also include time to send and receive messages from called services. This could add nanoseconds to minutes per each request based on network load and server usage of the service provider. If speed highly desirable quality attribute then I would consider creating components that are hosted where the client application is located. References: Rader, Dave. (2002). Overcoming Web Services Challenges with Smart Design: http://soa.sys-con.com/node/39458

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  • Are there any issues with MySQL's i18n(indic language) support ?

    - by anjanb
    Hi All, We're evaluating MySQL and PostgreSQL for building our indic language web application which will use MySQL or PostgreSQL. One of my colleagues mentioned that MySQL had issues with i18n. I mostly come from the Oracle world and although I've played a lil with MySQL, I don't know enough to know that there are issues with its i18n support. Does anyone know issues with MySQL's i18n support and if PostgreSQL would be better placed for building an application with indic language support(kannada, telugu, tamil, etc) ? Just so you know, we're going to be using J2EE to build this application and we will be using JDBC drivers to access the DB. P.S : Will anything change if we were to use Rails to build the app instead of J2EE ? Thank you,

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  • Tallying records using annotate() not working as should.

    - by 47
    I have two classes: Vehicle and Issues....a Vehicle object can have several issues recorded in the Issues class. What I want to do is to have a list of all issues, with each vehicle appearing only once and the total number of issues shown, plus other details....clicking on the record will then take the user to another page with all those issues for a selected vehicle shown in detail now. I tried this out using annotate, but I could only access the count and vehicle foreign key, but none of the other fields in the Vehicle class. class Issues(models.Model): vehicle = models.ForeignKey(Vehicle) description = models.CharField('Issue Description', max_length=30,) type = models.CharField(max_length=10, default='Other') status = models.CharField(max_length=12, default='Pending') priority = models.IntegerField(default='8', editable=False) date_time_added = models.DateTimeField(default=datetime.today, editable=False) last_updated = models.DateTimeField(default=datetime.today, editable=False) def __unicode__(self): return self.description The code I was using to annotate is: issues = Issues.objects.all().values('vehicle').annotate(count=Count('id')) What could be the problem?

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  • Do you have ideas for a workaround for this Known bug in Visual Studio 2010's addIn model ?

    - by Jesper
    When developing AddIns for Visual Studio 2010 the following line fails: CommandBarEvents handler = (EnvDTE.CommandBarEvents)m_VSStudio.DTE.Events.get_CommandBarEvents(popup); Update: Forgot to tell that m_VSStudio is of the type DTE2 Where popup is of the type CommandBarPopup (for the type CommandBarControl it works though) The line fails with this Exception: System.Runtime.InteropServices.COMException (0x80020003): Member not found. (Exception from HRESULT: 0x80020003 (DISP_E_MEMBERNOTFOUND)) The exact same line worked in Visual Studio 2008. The purpose of the line is to get a handler which handles clickevents, when one clicks the Popup. After som searching I found this link: http://connect.microsoft.com/VisualStudio/feedback/details/524335/events-get-commandbarevents-exception-on-submenus-reproducible-bug-addin Which basicly states that it is a known bug, which will not be fixed, because there is a workaround. But unfortunately it does not state the workaround :( I would be extremely pleased if anybody has a great idea for a workaround ? The reason why I want to listen to the click events is because I want to show or hide the submenuitems (CommandBarControl) given some condition, when one clicks a menu (CommandBarPopup). So a workaround that uses something else than the click event would also be appreciated.

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  • NSString sizeWithFont: returning inconsistent results? known bug?

    - by Olof Hedman
    I'm trying to create a simple custom UIView wich contain a string drawn with a single font, but where the first character is slightly larger. I thought this would be easily implemented with two UILabel:s placed next to eachother. I use NSString sizeWithFont to measure my string to be able to lay it out correctly. But I noticed that the font baseline in the returned rectangle varies with +/- 1 pixel depending on the font size I set. Here is my code: NSString* ctxt = [text substringToIndex:1]; NSString* ttxt = [text substringFromIndex:1]; CGSize sz = [ctxt sizeWithFont: cfont ]; clbl = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, sz.width, sz.height)]; clbl.text = ctxt; clbl.font = cfont; clbl.backgroundColor = [UIColor clearColor]; [contentView addSubview:clbl]; CGSize sz2 = [ttxt sizeWithFont: tfont]; tlbl = [[UILabel alloc] initWithFrame:CGRectMake(sz.width, (sz.height - sz2.height), sz2.width, sz2.height)]; tlbl.text = ttxt; tlbl.font = tfont; tlbl.backgroundColor = [UIColor clearColor]; [contentView addSubview:tlbl]; If I use 12.0 and 14.0 as sizes, it works fine. But if I instead use 13.0 and 15.0, then the first character is 1 pixel too high. Is this a known problem? Any suggestions how to work around it? Creating a UIWebView with a CSS and HTML page seems way overkill for this. and more work to handle dynamic strings. Is that what I'm expected to do?

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  • Is there any well-known paradigm for iterating enum values?

    - by SadSido
    I have some C++ code, in which the following enum is declared: enum Some { Some_Alpha = 0, Some_Beta, Some_Gamma, Some_Total }; int array[Some_Total]; The values of Alpha, Beta and Gamma are sequential, and I gladly use the following cycle to iterate through them: for ( int someNo = (int)Some_Alpha; someNo < (int)Some_Total; ++someNo ) {} This cycle is ok, until I decide to change the order of the declarations in the enum, say, making Beta the first value and Alpha - the second one. That invalidates the cycle header, because now I have to iterate from Beta to Total. So, what are the best practices of iterating through enum? I want to iterate through all the values without changing the cycle headers every time. I can think of one solution: enum Some { Some_Start = -1, Some_Alpha, ... Some_Total }; int array[Some_Total]; and iterate from (Start + 1) to Total, but it seems ugly and I have never seen someone doing it in the code. Is there any well-known paradigm for iterating through the enum, or I just have to fix the order of the enum values? (let's pretend, I really have some awesome reasons for changing the order of the enum values)...

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  • JPA exception: Object: ... is not a known entity type.

    - by Toto
    I'm new to JPA and I'm having problems with the autogeneration of primary key values. I have the following entity: package jpatest.entities; import java.io.Serializable; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; @Entity public class MyEntity implements Serializable { private static final long serialVersionUID = 1L; @Id @GeneratedValue(strategy = GenerationType.AUTO) private Long id; public Long getId() { return id; } public void setId(Long id) { this.id = id; } private String someProperty; public String getSomeProperty() { return someProperty; } public void setSomeProperty(String someProperty) { this.someProperty = someProperty; } public MyEntity() { } public MyEntity(String someProperty) { this.someProperty = someProperty; } @Override public String toString() { return "jpatest.entities.MyEntity[id=" + id + "]"; } } and the following main method in other class: public static void main(String[] args) { EntityManagerFactory emf = Persistence.createEntityManagerFactory("JPATestPU"); EntityManager em = emf.createEntityManager(); em.getTransaction().begin(); MyEntity e = new MyEntity("some value"); em.persist(e); /* (exception thrown here) */ em.getTransaction().commit(); em.close(); emf.close(); } This is my persistence unit: <?xml version="1.0" encoding="UTF-8"?> <persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"> <persistence-unit name="JPATestPU" transaction-type="RESOURCE_LOCAL"> <provider>oracle.toplink.essentials.PersistenceProvider</provider> <class>jpatest.entities.MyEntity</class> <properties> <property name="toplink.jdbc.user" value="..."/> <property name="toplink.jdbc.password" value="..."/> <property name="toplink.jdbc.url" value="jdbc:mysql://localhost:3306/jpatest"/> <property name="toplink.jdbc.driver" value="com.mysql.jdbc.Driver"/> <property name="toplink.ddl-generation" value="create-tables"/> </properties> </persistence-unit> </persistence> When I execute the program I get the following exception in the line marked with the proper comment: Exception in thread "main" java.lang.IllegalArgumentException: Object: jpatest.entities.MyEntity[id=null] is not a known entity type. at oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.registerNewObjectForPersist(UnitOfWorkImpl.java:3212) at oracle.toplink.essentials.internal.ejb.cmp3.base.EntityManagerImpl.persist(EntityManagerImpl.java:205) at jpatest.Main.main(Main.java:...) What am I missing?

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  • Unicorn 3.3.1 and Rack 1.1.0 issues?

    - by user41422
    I'm upgrading from the Ruby Enterprise Edition 1.8.6 to the latest 1.8.7 version with Unicorn to facilitate an upgrade to Rails 2.3.10, and am running into some issues. Should I uninstall the older versions of these gems? Here's the log messages: I'm upgrading from the Ruby Enterprise Edition 1.8.6 to the latest 1.8.7 version with Unicorn to facilitate an upgrade to Rails 2.3.10, and am running into some issues. Should I uninstall the older versions of these gems? I, [2011-02-02T22:06:16.328076 #30672] INFO -- : listening on addr=0.0.0.0:8080 fd=3 I, [2011-02-02T22:06:16.333137 #30672] INFO -- : Refreshing Gem list /srv/ree/bin/unicorn_rails must be run inside RAILS_ROOT: #<Gem::LoadError: can't activate rack (~> 1.1.0, runtime) for ["actionpack-2.3.10", "rails-2.3.10"], already activated rack-1.2.1 for ["unicorn-3.3.1"]> I, [2011-02-02T22:07:12.259436 #30701] INFO -- : listening on addr=0.0.0.0:8080 fd=3 I, [2011-02-02T22:07:12.259952 #30701] INFO -- : Refreshing Gem list /srv/ree/bin/unicorn_rails must be run inside RAILS_ROOT: #<Gem::LoadError: can't activate rack (~> 1.1.0, runtime) for ["actionpack-2.3.10", "rails-2.3.10"], already activated rack-1.2.1 for ["unicorn-3.3.1"]> I, [2011-02-02T22:09:27.787177 #30772] INFO -- : listening on addr=0.0.0.0:8080 fd=3 I, [2011-02-02T22:09:27.787691 #30772] INFO -- : Refreshing Gem list /srv/ree/bin/unicorn_rails must be run inside RAILS_ROOT: #<Gem::LoadError: can't activate rack (~> 1.1.0, runtime) for ["actionpack-2.3.10", "rails-2.3.10"], already activated rack-1.2.1 for ["unicorn-3.3.1"]> I, [2011-02-02T22:10:44.175407 #30846] INFO -- : listening on addr=0.0.0.0:8080 fd=3 I, [2011-02-02T22:10:44.175928 #30846] INFO -- : Refreshing Gem list /srv/ree/bin/unicorn_rails must be run inside RAILS_ROOT: #<Gem::LoadError: can't activate rack (~> 1.1.0, runtime) for ["actionpack-2.3.10", "rails-2.3.10"], already activated rack-1.2.1 for ["unicorn-3.3.1"]>

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