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• How to the view count of a question in momery?

  - by Freewind

  My website is like stackoverflow, there are many questions. I want to record how many times a question has been visited. I have a column called "view_count" in the question table to save it. When a user visited a question many times, the view_count should be increased only 1. So I have to record which user has visited which question, and I think it is too much expensive to save them in the database, because the records will be huge. So I want to keep them in the memory, and persistent the number to database every 10 minutes. I have searched about "cache" of rails, but I haven't found an example. I need an simple sample of how to do this, thanks for help~

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• Using Unity and interfaces, how do I create a concrete class that implements IDisposable

  - by Ryan ONeill

  I have an interface (IDbAccess) for a database access class so that I can unit test it using Unity. It all works fine in Unity and now I want to make the concrete database class implement IDisposable so that it closes the db connections. My problem is that Unity does not understand that my concrete class is disposable because the interface (IDbAccess) cannot implement another interface. So how can I write code like this (pseudo code) so that Unity is aware that it needs to dispose the class as soon as I am done? Using var MyDbAccessInstance = Unity.Resolve<IDbAccess> { } Thanks Ryan

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• Looking for efficient scaling patterns for Silverlight application with distributed text-file data s

  - by Edward Tanguay

  I'm designing a Silverlight software solution for students and teachers to record flashcards, e.g. words and phrases that students find while reading and errors that teachers notice while teaching. Requirements are: each person publishes his own flashcards in a file on a web server, e.g. http://:www.mywebserver.com/flashcards.txt other people subscribe to that person's flashcards by using a Silverlight flashcard reader that I have developed and entering the URLs of flashcard files they want to subscribe to, URLs and imported flashcards being saved in IsolatedStorage the flashcards.txt file has the following simple format: title, then blocks of question/answers: Jim Smith's flashcards from English class 53-222, winter semester 2009 ==fla Das kann nicht sein. That can't be. ==fla Es sei denn, er kommt nicht. Unless he doesn't come. The user then makes public the URL to his flashcard file and other readers begin reading in his flashcards. In order to lower the bar for non-technical users to contribute, it will even be possible for them to save this text in a Google Document, which they publish and distribute the URL. The flashcard readers will then recognize it is a google document and perform the necessary screen scraping to get at the raw text. I have two technical questions about this approach: What is a best way to plan now for scalability issues: e.g. if your reader is subscribed to 10 flashcard files that are each 200K, it will have to download 2MB of text just to find out if any new flashcards are available. Or can I somehow accurately and consistently get at the last update date/time of text files on servers and published google docs? Each reader will have the ability to allow the person to test himself on imported flashcards and add meta information to them, e.g. categorize them, edit them, etc. This information will be stored in IsolatedStorage along with the important flashcards themselves. What is a good pattern to allow these readers to share and synchronize this meta data, e.g. so when you are looking at a flashcard you can see that 5 other people have made corrections to it. The best solution I can think of now is that the Silverlight readers will have to republish their data to a central database, but then there is the problem of uniquely identifying each flashcard, the best approach seems to be URL + position-in-file, or even better URL + original text of both question and answer fields, but both of these have their obvious drawbacks. The main requirement is that the bar for participation is kept as low as possible, i.e. type text in a google document, publish it, distribute the URL, and you're publishing within the flashcard community. So I want to come up with the most efficient technical solutions in order to compensate for the lack of database, lack of unique ids, etc. For those who have designed or developed similar non-traditional, distributed database projects like this, what advice, experience or best-practice tips you can share on the above two points?

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• IEnumerable<> to IList<>

  - by nachid

  I am using Linq to query my database and returning a generic IList. Whatever I tried I couldn't convert an IQueryable to an IList. Here is my code. I cannot write simpler than this and I don't understand why it is not working. public IList<IRegion> GetRegionList(string countryCode) { var query = from c in Database.RegionDataSource where (c.CountryCode == countryCode) orderby c.Name select new {c.RegionCode, c.RegionName}; return query.Cast<IRegion>().ToList(); } This returns an list with the right number of items but they are all empty Please help, I am bloqued with this for a couple of days now

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• Combobox in bound DataGridView

  - by Dan

  Hi. I've got a DataGridView control which is bound to a database table. I want one of the columns in the gridview to be of combobox type. The combobox should contain a list of hardcoded strings, which is the same for all rows in the datagridview. One of the fields in my database table is an index for this list of hardcoded strings. I've programatically added a new column to the gridview of type "DataGridViewComboBoxColumn", which successfully creates the column with comboboxes in it. However, that's then not bound to the index field in my DB table. The index field in my DB table is actually automatically bound to a column via the DataAdapter::Fill method. I've set this column to hidden, so it's hidden to the user. Obviously just before updating the dataadapter, I can programatically fixup the hidden column in my datatable with the SelectedIndex of my combobox. Just wondering if there's a better way of doing this? Thankyou for any help with this, Dan.

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• SQL Server 2000 tables

  - by klork

  We currently have an SQL Server 2000 database with one table containing data for multiple users. The data is keyed by memberid which is an integer field. The table has a clustered index on memberid. The table is now about 200 million rows. Indexing and maintenance are becoming issues. We are debating splitting the table into one table per user model. This would imply that we would end up with a very large number of tables potentially upto the 2,147,483,647, considering just positive values. My questions: Does anyone have any experience with a SQL Server (2000/2005) installation with millions of tables? What are the implications of this architecture with regards to maintenance and access using Query Analyzer, Enterprise Manager etc. What are the implications to having such a large number of indexes in a database instance. All comments are appreciated. Thanks

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• Rails 2.3 - Storing sessions in different schema

  - by sa125

  Hi - I want to config my app to use a different schema than the default for storing sessions. Basically, I want the app to store all its active_record objects in app_development and only its sessions in app_sessions. Normally this could be done by defining the sessions db in database.yml: development: # ... sessions: host: localhost database: app_sessions username: blah password: sssshhh #.... And then setting in the model: class Session < ActiveRecord::Base establish_connection :sessions #... end But since session doesn't have a model class defined, I'm looking for a way to tell it where to store its data. I've noticed the session comes from ActionController::Session, but couldn't find what I needed there. Any thoughts? thanks.

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• Check firebird databases present

  - by Ronaldo Junior

  Our software installer install firebird if it is not present on the system and, as we are pursuing Win certificate the uninstaller should remove it but, we want to make sure that even if it was the installer that put it there, if any new software is using it now with a new database, we would not remove it (Firebird). The question is: Is it possible to query the server and ask what are the databases running on it? This is it so that we can decide, automatically if we can remove the database or not. A few extra info: Our installer is Innosetup and it does a good job already - we just trying to make it smarter because of the "Developed by" or "Compatible with" windows logo.

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• SqlBulkCopy From CSV to SQL Datatable

  - by Swapnil

  I'm using SQL Server 2005, VB.NET 2005. I want to be able to import a very large excel file into a SQL table called "XYZ" I've done this by doing the following: 1. Save the excel file as csv.(Using SaveAs XLCSV option) 2. Build a datatable "ABC" From CSV.(using ODBC Connection and Select * from '*'.csv command) 3. copy the datatable"ABC" into database table "xyz" (using sqlBulkCopy.WriteToServer()) It works fine without any error but when i checked my database i found that data type for some columns has been changed and hence it didn't copy some of the records.Any help would be appreciated

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• Large number array compression

  - by gatapia

  Hi All, I've got a javascript application that sends a large amount of numerical data down the wire. This data is then stored in a database. I am having size issues (too much bandwidth, database getting too big). I am now ready to sacrifice some performance for compression. I was thinking of implementing a base 62 number.toString(62) and parseInt(compressed, 62). This would certainly reduce the size of the data but before I go ahead and do this I thought I would put it to the folks here as I know there must be some outside the box solution I have not considered. The basic specs are: - Compress large number arrays into strings for JSONP transfer (So I think UTF is out) - Be relatively fast, look I'm not expecting same performance as I have now but I also don't want gzip compression either. Any ideas would be greatly appreciated. Thanks Guido Tapia

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• How to arrange the items of gridview ?

  - by kranthi

  I have a settings page in my asp.net website,in which a user can select desired items and their order to be displayed in another page.I am displaying these items(which are obtained from database) in a gridview with checkboxes,up/down arrows next to them.Once the user makes his selection/rearranges the items and clicks on the 'Save' button,I am saving the data into another database table.When this particular user logsin again I want to check the items which were already chosen by him and arrange them in the order he specified, on page load.I am able to check the checkboxes of the already chosen items but do not understand how do I arrange the items in the user specified order? Please help. Thanks.

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• ASP.NET Web Page Not Available

  - by hahuang65

  It's pretty difficult to show code for ASP.NET here, so I will try my best to describe my problem. I have a FileUploadControl and a Button that calls a function when it's clicked. It seems that the Button function works when there is nothing chosen for my FileUploadControl. However, when there is something chosen in the FileUploadControl (I have selected a file to upload), there is a problem when I click the button. It completely does not matter what the function does (it could just be writing to a label, even when it has nothing to do with the FileUploadControl). The error I get is: This webpage is not available. The webpage at http://localhost:2134/UploadMedia/Default.aspx might be temporarily down or it may have moved permanently to a new web address. I have searched on Google, and people seem to have had problems with this, but different causes from me. They have said that their ASP.NET Development Server port is actually different from their port in the address bar. This is not the case for me. Also, another problem people have had is with Use Dynamic Ports. I have tried both true and false. I have also tried different ports, and I have always gotten the same error. This is really driving me crazy because it doesn't matter what the code in the buttonFunction is, it doesn't work as long as there is something in the FileUploadControl. If there is nothing, it seems to work fine. Here is the code for the ASP.NET Controls: <asp:FileUpload id="FileUploadControl" runat="server" /> <asp:Button runat="server" id="UploadButton" text="Upload" OnClick="uploadClicked" /> <br /><br /> <asp:Label runat="server" id="StatusLabel" text="Upload status: " /> And this is the code for the button function: protected void uploadClicked(object sender, EventArgs e) { if (FileUploadControl.HasFile) { string filename = Path.GetFileName(FileUploadControl.FileName); //Check if the entered username already exists in the database. String sqlDupStmt = "Select songPath from Songs where songPath ='" + Server.MapPath("~/Uploads/") + filename + "'"; SqlConnection sqlDupConn = new SqlConnection(@"Data Source = .\SQLEXPRESS; AttachDbFilename = |DataDirectory|\Database.mdf; Integrated Security = True; User Instance = True;"); SqlCommand sqlDupCmd = new SqlCommand(sqlDupStmt, sqlDupConn); sqlDupCmd.Connection.Open(); SqlDataReader sqlDupReader = sqlDupCmd.ExecuteReader(CommandBehavior.CloseConnection); if (sqlDupReader.Read()) { StatusLabel.Text = "Upload status: The file already exists."; sqlDupReader.Close(); } else { sqlDupReader.Close(); //See "How To Use DPAPI (Machine Store) from ASP.NET" for information about securely storing connection strings. String sqlStmt = "Insert into Songs values (@songpath);"; SqlConnection sqlConn = new SqlConnection(@"Data Source = .\SQLEXPRESS; AttachDbFilename = |DataDirectory|\Database.mdf; Integrated Security = True; User Instance = True; uid=sa; pwd=password;"); SqlCommand cmd = new SqlCommand(sqlStmt, sqlConn); SqlParameter sqlParam = null; //Usage of Sql parameters also helps avoid SQL Injection attacks. sqlParam = cmd.Parameters.Add("@userName", SqlDbType.VarChar, 150); sqlParam.Value = Server.MapPath("~/Uploads/") + filename; //Attempt to add the song to the database. try { sqlConn.Open(); cmd.ExecuteNonQuery(); FileUploadControl.SaveAs(Server.MapPath("~/Uploads/") + filename); songList.Items.Add(filename); StatusLabel.Text = "Upload status: File uploaded!"; } catch (Exception ex) { StatusLabel.Text = "Upload status: The file could not be uploaded. The following error occured: " + ex.Message; } finally { sqlConn.Close(); } } } } But this buttonfunction provides the same results: protected void uploadClicked(object sender, EventArgs e) { StatusLabel.Text = "FooBar"; } Has anyone had this problem before, or might know what the cause is? Thanks!

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• Swipe gestures on Android ListView items

  - by Bartek

  I have a ListView populated by a ResourceCursorAdapter. I use the loaders mechanism to query a ContentProvider for list items. I detect swipe gestures on the list items to perform some actions on them. New items get added by a background service, so the list can change dynamically. Everything works fine, except when I start swiping and a database change occurs (as a result of the background service adding a new row). In such case the gesture is not detected properly. I noticed that ACTION_CANCEL is dispatched to the list item view and also that bindView is executed for all visible items. Inside the bindView method I only set some text - I don't change any listeners there. How can I make gestures work even when new items are being added by the background service? Perhaps there's a way to prevent the motion from being cancelled or I can pause database updates so they don't interrupt the gesture.

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• Installing Oracle 11gR2 on RHEL 6.2

  - by Chris

  Hello all I'm having some difficulty installing Oracle 11gR2 on RHEL 6.2 I have compiled a giant list of every single step I have taken so far I installed RHEL 6.2 on VMWARE it did it's easy install automatically I Selected 4gb of memory Selected max size of 80Gb Selected 2 processors Sorry for the bad styling copy paste isn't working correctly The version of oracle i downloaded is Linux x86-64 11.2.0.1 I am installing this on a local machine NOT a remote machine I followed the following documentation http://docs.oracle.com/cd/E11882_01/install.112/e24326/toc.htm I bolded the steps which I was least sure about from my research Easy installed with RHEL 6.2 for VMWARE Registered with red hat so I can get updates Reinstalled vmware-tools by pressing enter at every choice Sudo yum update at the end something about GPG key selected y then y Checked Memory Requirements grep MemTotal /proc/meminfo MemTotal: 3921368 kb uname -m x86_64 grep SwapTotal /proc/meminfo SwapTotal: 6160376 kb free total used free shared buffers cached Mem: 3921368 2032012 1889356 0 76216 1533268 -/+ buffers/cache: 422528 3498840 Swap: 6160376 0 6160376 df -h /dev/shm Filesystem Size Used Avail Use% Mounted on tmpfs 1.9G 276K 1.9G 1% /dev/shm df -h /tmp Filesystem Size Used Avail Use% Mounted on /dev/sda2 73G 2.7G 67G 4% / df -h Filesystem Size Used Avail Use% Mounted on /dev/sda2 73G 2.7G 67G 4% / tmpfs 1.9G 276K 1.9G 1% /dev/shm /dev/sda1 291M 58M 219M 21% /boot All looked fine to me except maybe for swap? Software Requirements cat /proc/version Linux version 2.6.32-220.el6.x86_64 ([email protected]) (gcc version 4.4.5 20110214 (Red Hat 4.4.5-6) (GCC) ) #1 SMP Wed Nov 9 08:03:13 EST 2011 uname -r 2.6.32-220.el6.x86_64 (same as above but whatever) According to the tutorial should be On Red Hat Enterprise Linux 6 2.6.32-71.el6.x86_64 or later These are the versions of software I have installed binutils-2.20.51.0.2-5.28.el6.x86_64 compat-libcap1-1.10-1.x86_64 compat-libstdc++-33-3.2.3-69.el6.x86_64 compat-libstdc++-33.i686 0:3.2.3-69.el6 gcc-4.4.6-3.el6.x86_64 gcc-c++.x86_64 0:4.4.6-3.el6 glibc-2.12-1.47.el6_2.12.x86_64 glibc-2.12-1.47.el6_2.12.i686 glibc-devel-2.12-1.47.el6_2.12.x86_64 glibc-devel.i686 0:2.12-1.47.el6_2.12 ksh.x86_64 0:20100621-12.el6_2.1 libgcc-4.4.6-3.el6.x86_64 libgcc-4.4.6-3.el6.i686 libstdc++-4.4.6-3.el6.x86_64 libstdc++.i686 0:4.4.6-3.el6 libstdc++-devel.i686 0:4.4.6-3.el6 libstdc++-devel-4.4.6-3.el6.x86_64 libaio-0.3.107-10.el6.x86_64 libaio-0.3.107-10.el6.i686 libaio-devel-0.3.107-10.el6.x86_64 libaio-devel-0.3.107-10.el6.i686 make-3.81-19.el6.x86_64 sysstat-9.0.4-18.el6.x86_64 unixODBC-2.2.14-11.el6.x86_64 unixODBC-devel-2.2.14-11.el6.x86_64 unixODBC-devel-2.2.14-11.el6.i686 unixODBC-2.2.14-11.el6.i686 8. Probably screwed up here or step 9 /usr/sbin/groupadd oinstall /usr/sbin/groupadd dba(not sure why this isn't in the tutorial) /usr/sbin/useradd -g oinstall -G dba oracle passwd oracle /sbin/sysctl -a | grep sem Xkernel.sem = 250 32000 32 128 /sbin/sysctl -a | grep shm kernel.shmmax = 68719476736 kernel.shmall = 4294967296 kernel.shmmni = 4096 vm.hugetlb_shm_group = 0 /sbin/sysctl -a | grep file-max Xfs.file-max = 384629 /sbin/sysctl -a | grep ip_local_port_range Xnet.ipv4.ip_local_port_range = 32768 61000 /sbin/sysctl -a | grep rmem_default Xnet.core.rmem_default = 124928 /sbin/sysctl -a | grep rmem_max Xnet.core.rmem_max = 131071 /sbin/sysctl -a | grep wmem_max Xnet.core.wmem_max = 131071 /sbin/sysctl -a | grep wmem_default Xnet.core.wmem_default = 124928 Here is my sysctl.conf file I only added the items that were bigger: Kernel sysctl configuration file for Red Hat Linux # For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and sysctl.conf(5) for more details. Controls IP packet forwarding net.ipv4.ip_forward = 0 Controls source route verification net.ipv4.conf.default.rp_filter = 1 Do not accept source routing net.ipv4.conf.default.accept_source_route = 0 Controls the System Request debugging functionality of the kernel kernel.sysrq = 0 Controls whether core dumps will append the PID to the core filename. Useful for debugging multi-threaded applications. kernel.core_uses_pid = 1 Controls the use of TCP syncookies net.ipv4.tcp_syncookies = 1 Disable netfilter on bridges. net.bridge.bridge-nf-call-ip6tables = 0 net.bridge.bridge-nf-call-iptables = 0 net.bridge.bridge-nf-call-arptables = 0 Controls the maximum size of a message, in bytes kernel.msgmnb = 65536 Controls the default maxmimum size of a mesage queue kernel.msgmax = 65536 Controls the maximum shared segment size, in bytes kernel.shmmax = 68719476736 Controls the maximum number of shared memory segments, in pages kernel.shmall = 4294967296 fs.aio-max-nr = 1048576 fs.file-max = 6815744 kernel.sem = 250 32000 100 128 net.ipv4.ip_local_port_range = 9000 65500 net.core.rmem_default = 262144 net.core.rmem_max = 4194304 net.core.wmem_default = 262144 net.core.wmem_max = 1048576 /sbin/sysctl -p net.ipv4.ip_forward = 0 net.ipv4.conf.default.rp_filter = 1 net.ipv4.conf.default.accept_source_route = 0 kernel.sysrq = 0 kernel.core_uses_pid = 1 net.ipv4.tcp_syncookies = 1 error: "net.bridge.bridge-nf-call-ip6tables" is an unknown key error: "net.bridge.bridge-nf-call-iptables" is an unknown key error: "net.bridge.bridge-nf-call-arptables" is an unknown key kernel.msgmnb = 65536 kernel.msgmax = 65536 kernel.shmmax = 68719476736 kernel.shmall = 4294967296 fs.aio-max-nr = 1048576 fs.file-max = 6815744 kernel.sem = 250 32000 100 128 net.ipv4.ip_local_port_range = 9000 65500 net.core.rmem_default = 262144 net.core.rmem_max = 4194304 net.core.wmem_default = 262144 net.core.wmem_max = 1048576 su - oracle ulimit -Sn 1024 ulimit -Hn 1024 ulimit -Su 1024 ulimit -Hu 30482 ulimit -Su 1024 ulimit -Ss 10240 ulimit -Hs unlimited su - nano /etc/security/limits.conf *added to the end of the file * oracle soft nproc 2047 oracle hard nproc 16384 oracle soft nofile 1024 oracle hard nofile 65536 oracle soft stack 10240 exit exit su - mkdir -p /app/ chown -R oracle:oinstall /app/ chmod -R 775 /app/ 9. THIS IS PROBABLY WHERE I MESSED UP I then exited out of the root account so now I'm back in my account chris then I su - oracle echo $SHELL /bin/bash umask 0022 (so it should be set already to what is neccesary) Also from what I have read I do not need to set the DISPLAY variable because I'm installing this on the localhost I then opened the .bash_profile of the oracle and changed it to the following .bash_profile Get the aliases and functions if [ -f ~/.bashrc ]; then . ~/.bashrc fi User specific environment and startup programs PATH=$PATH:$HOME/bin; export PATH ORACLE_BASE=/app/oracle ORACLE_SID=orcl export ORACLE_BASE ORACLE_SID I then shutdown the virtual machine shared my desktop folder from my windows 7 then turned back on the virtual machine logged in as chris opened up a terminal then: su - for some reason the shared folder didn't appear so I reinstalled vmware tools again and restarted then same as before su - cp -R linux_oracle/database /db; chown -R oracle:oinstall /db; chmod -R 775 /db; ll /db drwxrwxr-x. 8 oracle oinstall 4096 Jun 5 06:20 database exit su - oracle cd /db/database ./runInstaller AND FINALLY THE INFAMOUS JAVA:132 ERROR MESSAGE Starting Oracle Universal Installer... Checking Temp space: must be greater than 80 MB. Actual 65646 MB Passed Checking swap space: must be greater than 150 MB. Actual 6015 MB Passed Checking monitor: must be configured to display at least 256 colors. Actual 16777216 Passed Preparing to launch Oracle Universal Installer from /tmp/OraInstall2012-06-05_06-47-12AM. Please wait ...[oracle@localhost database]$ Exception in thread "main" java.lang.UnsatisfiedLinkError: /tmp/OraInstall2012-06-05_06-47-12AM/jdk/jre/lib/i386/xawt/libmawt.so: libXext.so.6: cannot open shared object file: No such file or directory at java.lang.ClassLoader$NativeLibrary.load(Native Method) at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1751) at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1647) at java.lang.Runtime.load0(Runtime.java:769) at java.lang.System.load(System.java:968) at java.lang.ClassLoader$NativeLibrary.load(Native Method) at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1751) at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1668) at java.lang.Runtime.loadLibrary0(Runtime.java:822) at java.lang.System.loadLibrary(System.java:993) at sun.security.action.LoadLibraryAction.run(LoadLibraryAction.java:50) at java.security.AccessController.doPrivileged(Native Method) at java.awt.Toolkit.loadLibraries(Toolkit.java:1509) at java.awt.Toolkit.(Toolkit.java:1530) at com.jgoodies.looks.LookUtils.isLowResolution(Unknown Source) at com.jgoodies.looks.LookUtils.(Unknown Source) at com.jgoodies.looks.plastic.PlasticLookAndFeel.(PlasticLookAndFeel.java:122) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:242) at javax.swing.SwingUtilities.loadSystemClass(SwingUtilities.java:1783) at javax.swing.UIManager.setLookAndFeel(UIManager.java:480) at oracle.install.commons.util.Application.startup(Application.java:758) at oracle.install.commons.flow.FlowApplication.startup(FlowApplication.java:164) at oracle.install.commons.flow.FlowApplication.startup(FlowApplication.java:181) at oracle.install.commons.base.driver.common.Installer.startup(Installer.java:265) at oracle.install.ivw.db.driver.DBInstaller.startup(DBInstaller.java:114) at oracle.install.ivw.db.driver.DBInstaller.main(DBInstaller.java:132)

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• How to select a MAX value from column in Query Builder in Kohana framework?

  - by Victor Czechov

  I need to INSERT a data to table, but before a query I must to know the MAX value from column position, than to INSERT a data WHERE my SELECTED before position+1. Is it possible with query builder? following my first comment I did query: $p = DB::select(array(DB::expr('MAX(`position`)', 'p')))->from('supercategories')->execute(); echo $p; the error: ErrorException [ Notice ]: Undefined offset: 1 MODPATH\database\classes\kohana\database.php [ 505 ] 500 */ 501 public function quote_column($column) 502 { 503 if (is_array($column)) 504 { 505 list($column, $alias) = $column; 506 } 507 508 if ($column instanceof Database_Query) 509 { 510 // Create a sub-query

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• All Countries States Cities and Zipcodes in a Application

  - by Rishav Rastogi

  Is there a way getting all countries, states,cities zipcodes/ in one single database. I have been looking all over. I discovered geonames.org, which has I guess all of the content. But there is no way to fetch that data directly. I am using rails. If there any helpers or Plugins, it'd be great. It would be awesome if there is a complete resource in any parsable format which I can use to get this database in place. Please recommend if you any thanks I do have the iso country code list but no States for some countries. Thanks in advance

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• Create new field in a table that already exists - flex/air sqlite?

  - by Adam

  I've got a flex/air app I've been working on, it uses a local sqlite database that is created on the initial application start. I've added some features to the application and in the process I had to add a new field to one of the database tables. My questions is how to I go about getting the application to create one new field that is located in a table that already exists? this is a the line that creates the table stmt.text = "CREATE TABLE IF NOT EXISTS tbl_status ("+"status_id INTEGER PRIMARY KEY AUTOINCREMENT,"+" status_status TEXT)"; And now I'd like to add a status_default field. thanks! Thanks - MPelletier I've add the code you provided and it does add the field, but now the next time I restart my app I get an error - 'status_default' already exists'. So how can I go about adding some sort of a IF NOT EXISTS statement to the line you provided?

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• LLBLGenProDataSource : cannot see updates values of newly inserted item from a FormView

  - by tbone

  After performing a FormView.InsertItem, I am unable to read the new values from the bound object within the LLBLGenProDataSource that the FormView is bound to. I have tracing turned on, I can see the insert happen, and the data does make it into the database, yet when I examine the contents of LLBLGenProDataSource.EntityCollection(0) (there is only one item in the collection) I do not see the values from the FormView.....yet, they are somehow being inserted into the database. Relevant code: <llblgenpro:LLBLGenProDataSource ID="llbDataSource" runat="server" MaxNumberOfItemsToReturn="1" DataContainerType="EntityCollection" EntityCollectionTypeName="Domain.CollectionClasses.MetricCollection, Domain" LivePersistence="True" ThrowExceptionOnIllegalFieldInput="true" /> Private Sub frmEdit_ItemCreated(ByVal sender As Object, ByVal e As System.EventArgs) Handles frmEdit.ItemCreated If Me.llbDataSource.EntityCollection.Count = 0 Then Me.frmEdit.ChangeMode(FormViewMode.Insert) Me.llbDataSource.EntityCollection.Add(New MetricEntity) Me.frmEdit.DataBind() Else LoadDropdowns() End If End Sub Private Sub cmdSave_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmdSave.Click If Me.frmEdit.CurrentMode = FormViewMode.Edit Then Me.frmEdit.UpdateItem(False) ElseIf Me.frmEdit.CurrentMode = FormViewMode.Insert Then Me.frmEdit.InsertItem(False) 'Me.llbDataSource.DataBind() 'NOPE! Response.Redirect("~/MetricDetail.aspx?MetricCode=" & Me.llbDataSource.EntityCollection(0).Fields("MetricCode").CurrentValue.ToString) End If End Sub

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• how to souce a csh script in bash to set the enviroment

  - by Daniel

  We have oracle running on Solaris, and the shell is by default CSH. So the login script set the oracle_home,oracle_sid in csh also. But I don't like csh and want to use bash to do my work. So how to source the csh login script in bash? e.g, the following is what in the .cshrc file. And when use bash, I'd like use these variables. One way is to copy the variables again and use bash command, such as export ORACLE_SID=TEST. But doing so will let us to maintain two copy of the files. And when we change the database name, or upgrade the database, I need to maintian the bash login file seperately. It's nice to just use something like source .cshr in bash, but it doesn't work. setenv ORACLE_SID TEST setenv ORACLE_HOME /oracle/TEST/home/products/10204 setenv EPC_DISABLED TRUE setenv MANPATH /usr/local/man:/usr/share/man setenv EDITOR vi setenv LD_LIBRARY_PATH $ORACLE_HOME/lib:/usr/sfw/lib/64 setenv NLS_LANG AMERICAN_AMERICA.UTF8 setenv NLS_DATE_FORMAT "DD-MON-RR"

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• How to convert a python utc datetime to a local datetime using only python standard library?

  - by Nitro Zark

  I have a python datetime instance that was created using datetime.utcnow() and persisted in database. For display, I would like to convert the datetime instance reloaded from database to local datetime using the default local timezone (e.g. as if the datetime was create using datetime.now()) How can I convert the utc datetime to a local datetime using only python standard library (e.g. no pytz dependency)? It seems one solution would be to use datetime.astimezone( tz ), but how would do you get the default local timezone?

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• Are ORM's counterproductive to OO design?

  - by Jeremiah

  In OOD, design of an object is said to be characterized by its identity and behavior. Having used OR/M's in the past, the primary purpose, in my opinion, revolves around the ability to store/retrieve data. That is to say, OR/M objects are not design by behavior, but rather data (i.e. database tables). Case and point: Many OR/M tools come with a point-to-a-database-table-and-click-object-generator. If objects are no longer characterized by behavior this will, in my opinion, muddy the identity and responsibility of the objects. Subsequently, if objects are not defined by a responsibility this could lend a hand to having tightly coupled classes and overall poor design. Furthermore, I would think that in an application setting, you would be heading towards scalability issues. So, my question is, do you think that ORM's are counterproductive to OO design? Perhaps the underlying question would be whether or not they are counterproductive to application development.

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• Is the design notion of layers contrived?

  - by Bruce

  Hi all I'm reading through Eric Evans' awesome work, Domain-Driven Design. However, I can't help feeling that the 'layers' model is contrived. To expand on that statement, it seems as if it tries to shoe-horn various concepts into a specific, neat model, that of layers talking to each other. It seems to me that the layers model is too simplified to actually capture the way that (good) software works. To expand further: Evans says: "Partition a complex program into layers. Develop a design within each layer that is cohesive and that depends only on the layers below. Follow standard architectural patterns to provide loose coupling to the layers above." Maybe I'm misunderstanding what 'depends' means, but as far as I can see, it can either mean a) Class X (in the UI for example) has a reference to a concrete class Y (in the main application) or b) Class X has a reference to a class Y-ish object providing class Y-ish services (ie a reference held as an interface). If it means (a), then this is clearly a bad thing, since it defeats re-using the UI as a front-end to some other application that provides Y-ish functionality. But if it means (b), then how is the UI any more dependent on the application, than the application is dependent on the UI? Both are decoupled from each other as much as they can be while still talking to each other. Evans' layer model of dependencies going one way seems too neat. First, isn't it more accurate to say that each area of the design provides a module that is pretty much an island to itself, and that ideally all communication is through interfaces, in a contract-driven/responsibility-driven paradigm? (ie, the 'dependency only on lower layers' is contrived). Likewise with the domain layer talking to the database - the domain layer is as decoupled (through DAO etc) from the database as the database is from the domain layer. Neither is dependent on the other, both can be swapped out. Second, the idea of a conceptual straight line (as in from one layer to the next) is artificial - isn't there more a network of intercommunicating but separate modules, including external services, utility services and so on, branching off at different angles? Thanks all - hoping that your responses can clarify my understanding on this..

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• I am working in JSF and Richfaces technology.

  - by sankar

  I need to club rich panel menu with iteration to fetch data from database. kindly help

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• How to determine the maximum integer the model can handle?

  - by John Mee

  "What is the biggest integer the model field that this application instance can handle?" We have sys.maxint, but I'm looking for the database+model instance. We have the IntegerField, the SmallIntegerField, the PositiveSmallIntegerField, and a couple of others beside. They could all vary between each other and each database type. I found the "IntegerRangeField" custom field example here on stackoverflow. Might have to use that, and guess the lowest common denominator? Or rethink the design I suppose. Is there an easy way to work out the biggest integer an IntegerField, or its variants, can cope with?

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• SQL Query Not Functioning - No Error Message

  - by gamerzfuse

  // Write the data to the database $query = "INSERT INTO staff (name, lastname, username, password, position, department, birthmonth, birthday, birthyear, location, phone, email, street, city, state, country, zip, tags, photo) VALUES ('$name', '$lastname', '$username', '$password', '$position', '$department', '$birthmonth', '$birthday', '$birthyear', '$location', '$phone', '$email', '$street', '$city', '$state', '$country', '$zip', '$tags', '$photo')"; mysql_query($query); var_dump($query); echo '<p>' . $name . ' has been added to the Employee Directory.</p>'; if (!$query) { die('Invalid query: ' . mysql_error()); } Can someone tell me why the above code produced: string(332) "INSERT INTO staff (name, lastname, username, password, position, department, birthmonth, birthday, birthyear, location, phone, email, street, city, state, country, zip, tags, photo) VALUES ('Craig', 'Hooghiem', 'sdf', 'sdf', 'sdf', 'sdf', '01', '01', 'sdf', 'sdf', '', 'sdf', 'sdf', 'sd', 'sdf', 'sdf', 'sd', 'sdg', 'leftround.gif')" Craig has been added to the Employee Directory. But does not actually add anything into the database table "staff" ? I must be missing something obvious here.

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