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  • Entity Framework autoincrement key

    - by Tommy Ong
    I'm facing an issue of duplicated incremental field on a concurrency scenario. I'm using EF as the ORM tool, attempting to insert an entity with a field that acts as a incremental INT field. Basically this field is called "SequenceNumber", where each new record before insert, will read the database using MAX to get the last SequenceNumber, append +1 to it, and saves the changes. Between the getting of last SequenceNumber and Saving, that's where the concurrency is happening. I'm not using ID for SequenceNumber as it is not a unique constraint, and may reset on certain conditions such as monthly, yearly, etc. InvoiceNumber | SequenceNumber | DateCreated INV00001_08_14 | 1 | 25/08/2014 INV00001_08_14 | 1 | 25/08/2014 <= (concurrency is creating two SeqNo 1) INV00002_08_14 | 2 | 25/08/2014 INV00003_08_14 | 3 | 26/08/2014 INV00004_08_14 | 4 | 27/08/2014 INV00005_08_14 | 5 | 29/08/2014 INV00001_09_14 | 1 | 01/09/2014 <= (sequence number reset) Invoice number is formatted based on the SequenceNumber. After some research I've ended up with these possible solutions, but wanna know the best practice 1) Optimistic Concurrency, locking the table from any reads until the current transaction is completed (not fancy of this idea as I guess performance will be of a great impact?) 2) Create a Stored Procedure solely for this purpose, does select and insert on a single statement as such concurrency is at minimum (would prefer a EF based approach if possible)

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  • Django dictionary in templates: Grab key from another objects attribute

    - by Jordan Messina
    I have a dictionary called number_devices I'm passing to a template, the dictionary keys are the ids of a list of objects I'm also passing to the template (called implementations). I'm iterating over the list of objects and then trying to use the object.id to get a value out of the dict like so: {% for implementation in implementations %} {{ number_devices.implementation.id }} {% endfor %} Unfortunately number_devices.implementation is evaluated first, then the result.id is evaluated obviously returning and displaying nothing. I can't use parentheses like: {{ number_devices.(implementation.id) }} because I get a parse error. How do I get around this annoyance in Django templates? Thanks for any help!

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  • Simple App Engine Sessions Implementation

    - by raz0r
    Here is a very basic class for handling sessions on App Engine: """Lightweight implementation of cookie-based sessions for Google App Engine. Classes: Session """ import os import random import Cookie from google.appengine.api import memcache _COOKIE_NAME = 'app-sid' _COOKIE_PATH = '/' _SESSION_EXPIRE_TIME = 180 * 60 class Session(object): """Cookie-based session implementation using Memcached.""" def __init__(self): self.sid = None self.key = None self.session = None cookie_str = os.environ.get('HTTP_COOKIE', '') self.cookie = Cookie.SimpleCookie() self.cookie.load(cookie_str) if self.cookie.get(_COOKIE_NAME): self.sid = self.cookie[_COOKIE_NAME].value self.key = 'session-' + self.sid self.session = memcache.get(self.key) if self.session: self._update_memcache() else: self.sid = str(random.random())[5:] + str(random.random())[5:] self.key = 'session-' + self.sid self.session = dict() memcache.add(self.key, self.session, _SESSION_EXPIRE_TIME) self.cookie[_COOKIE_NAME] = self.sid self.cookie[_COOKIE_NAME]['path'] = _COOKIE_PATH print self.cookie def __len__(self): return len(self.session) def __getitem__(self, key): if key in self.session: return self.session[key] raise KeyError(str(key)) def __setitem__(self, key, value): self.session[key] = value self._update_memcache() def __delitem__(self, key): if key in self.session: del self.session[key] self._update_memcache() return None raise KeyError(str(key)) def __contains__(self, item): try: i = self.__getitem__(item) except KeyError: return False return True def _update_memcache(self): memcache.replace(self.key, self.session, _SESSION_EXPIRE_TIME) I would like some advices on how to improve the code for better security. Note: In the production version it will also save a copy of the session in the datastore. Note': I know there are much more complete implementations available online though I would like to learn more about this subject so please don't answer the question with "use that" or "use the other" library.

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  • Fluent NHibernate - How to map the foreign key column as a property

    - by Steve
    I am sure this is a straightforward question but consider the following: I have a reference between company and sector as follows: public class Company { public Guid ID { get; set; } public Sector Sector { get; set; } public Guid SectorID { get; set; } } public class Sector { public Guid ID { get; set; } public string Name { get; set; } } Ok. What I want is the SectorID of the Company object to be populated after I go: (new Company()).Sector = new Sector() { Name="asdf" } and do a flush. The mapping I am using kindly creates an additional column in the database called Sector_Id in the Company table, but this is not available as a property on Company. I want the SectorID property to be filled. The mapping i am currently using in the CompanyMap is References(c = c.Sector).Cascade.All(); Does anyone have any ideas?

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  • Sql Server problems reading columns with a foreigh key

    - by illdev
    I have a weird situation, where simple queries seem to never finish for instance SELECT top 100 ArticleID FROM Article WHERE ProductGroupID=379114 returns immediately SELECT top 1000 ArticleID FROM Article WHERE ProductGroupID=379114 never returns SELECT ArticleID FROM Article WHERE ProductGroupID=379114 never returns SELECT top 1000 ArticleID FROM Article returns immediately by 'returning' I mean 'in query analyzer the green check mark appears and it says "Query executed successfully"'. I sometimes get the rows painted to the grid in qa, but still the query goes on waiting for my client to time out - 'sometimes': SELECT ProductGroupID AS Product23_1_, ArticleID AS ArticleID1_, ArticleID AS ArticleID18_0_, Inventory_Name AS Inventory3_18_0_, Inventory_UnitOfMeasure AS Inventory4_18_0_, BusinessKey AS Business5_18_0_, Name AS Name18_0_, ServesPeople AS ServesPe7_18_0_, InStock AS InStock18_0_, Description AS Descript9_18_0_, Description2 AS Descrip10_18_0_, TechnicalData AS Technic11_18_0_, IsDiscontinued AS IsDisco12_18_0_, Release AS Release18_0_, Classifications AS Classif14_18_0_, DistributorName AS Distrib15_18_0_, DistributorProductCode AS Distrib16_18_0_, Options AS Options18_0_, IsPromoted AS IsPromoted18_0_, IsBulkyFreight AS IsBulky19_18_0_, IsBackOrderOnly AS IsBackO20_18_0_, Price AS Price18_0_, Weight AS Weight18_0_, ProductGroupID AS Product23_18_0_, ConversationID AS Convers24_18_0_, DistributorID AS Distrib25_18_0_, type AS Type18_0_ FROM Article AS articles0_ WHERE (IsDiscontinued = '0') AND (ProductGroupID = 379121) shows this behavior. I have no idea what is going on. Probably select is broken ;) Anyone can tell me how to handle such a situation? More info, anyone?

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  • switching default keyevents actions after key combinations

    - by liysd
    I need to change default actions of two events. When I press "enter" one action occurs, when I press "shift-enter" another. I need to switch it. I means if I press "enter" than "shift-enter" action occurs. I tried something like this but if doesn't work. f(evt.keyCode == 13) { if(!evt.shiftKey){ evt.preventDefault(); evt.shiftKey = true; var e = jQuery.Event("keydown"); e.which = 13; e.shiftKey = true; $(wym._doc).trigger(e); Is there any way to do it?

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  • avoid duplication with auto increment key in Hibernate

    - by Lily
    I am trying to use Hibernate to auto increment the id, however, I try to avoid duplication. class Service { Long id; // auto increment String name; String owner; // setter and getter } What I want to achieve is, whenever name and owner are the same, it will be a duplicated entry. In this case, I don't want to add another entry into the Database anymore. How to revise the hbm.xml files to avoid this issue?

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  • Rails: has_many association with a table in another database and without foreign key

    - by Fernando
    Here is my situation. I have model called Account. An account can have one or more contracts. The problem is that i'm dealing with a legacy application and each account's contracts are stored in a different database. Example: Account 1's contract are in account1_db.contracts. Account 2's contract are in account2_db.contracts. The database name is a field stored in accounts table. How can i make rails association work with this? This is a legacy PHP application and i simply can't change it to store everything in one table. I need to make it work somehow. I tried this, but it didn't worked: has_many :contracts, :conditions => [lambda{ Contract.set_table_name(self.database + '.contracts'); return '1' }] Any ideas?

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  • Registry key editing vb6 startup

    - by Francesco D.
    Is it possible that someone here could explain how to use this code. Please keep in mind i am a complete amateur, so simplifications may be needed. Private Const cPGM = "C:\VB Forum\startup\Example.exe" Dim oShell As IWshShell_Class Set oShell = New IWshShell_Class oShell.RegWrite "HKLM\Software\Microsoft\Windows\CurrentVersion\Run\MyVBApp", _ cPGM, "REG_SZ" How exactly is this code used? Is it saved as an .exe file and ran or what? Thanks for your prompt reply and informational feedback.

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  • MySQL foreign key constraints, cascade delete

    - by Cudos
    Hello. I want to use foreign keys to keep the integrity and avoid orphans (I already use innoDB). How do I make a SQL statment that DELETE ON CASCADE? Secondly, that using DELETE ON CASCADE. E.g. if I delete a category then it would delete products related to that category even though there are other categories related to those products. The pivot table "categories_products" creates a many-to-many relationship between the two other tables. categories - id (INT) - name (VARCHAR 255) products - id - name - price categories_products - categories_id - products_id

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  • "Undefined index" when quoting array key

    - by Satish
    I have a form in index.php <?php echo '<form action="update_act.php" method="POST">'; echo '<input type="submit" name="'.$row['act_name'].'" value="edit"> echo </form> ?> Here $row['act_name'] is a value fetched from database. My update_act.php file is <?php echo "Old Activity Name : ".$_POST['$row[\'act_name\']']; ?> But I am getting an error Undefined index: $row['act_name'] in C:\wamp\www\ps\activity\update_act.php. I want to have different names for different submits but I am not able to get its value in another page. Is there any way for it?

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  • How to make "msiexec /x" shortcut ask for elevation on XP?

    - by lonelyass
    On XP (user account) when running this shortcut: <Shortcut Id="UninstallStartMenuShortcut" Advertise="no" Name="AppName" Description="Uninstalls AppName" Target="[SystemFolder]msiexec.exe" Arguments="/x [ProductCode]"/> I'm getting an error "You must be an Administrator to remove this application. To remove this application, you can log on as an administrator, or contact your technical support group for assistance." Why this happens instead of asking for elevation with admin password? How can I avoid this stupid error?

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  • Foreign key on table A --> B, AND foreign key on table B --> A. How is this done?

    - by unclaimedbaggage
    Hi, I have two tables - 'business' and 'business_contacts'. The business_contact table has a many-to-one relationship with the business table. Furthermore, each business has a 'primary contact' field - which I'd assume is a one-to-many relationship with the business_contacts table. The problem, of course, is that this creates a catch-22 for data insertion. Since neither field can be null, I can't insert a business_contact until I have a corresponding business, but I can't insert a business until I have a corresponding business_contact. If anyone could help me get my head around how mutual one-to-many relationships are supposed to be dealt with I'd be most appreciative. (Project being done in MySQL if it makes any difference)

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  • Stopping the animation after you let go of a key

    - by Michael Zeuner
    What I have right now is an animation that starts when I press space: if(input.isKeyDown(Input.KEY_SPACE)) player = movingRightSwingingSword; However when I stop clicking space my animation continues. until I move my player, how do I make it so it stops the animation right when you let go of space? A few lines Animation player, movingUp, movingDown, movingLeft, movingRight, movingRightSwingingSword; int[] duration = {200,200}; public void init(GameContainer gc, StateBasedGame sbg) throws SlickException { Image[] attackRight = {new Image("res/buckysRightSword1.png"), new Image("res/buckysRightSword2.png")}; movingRightSwingingSword = new Animation(attackRight, duration, true); } public void update(GameContainer gc, StateBasedGame sbg, int delta) throws SlickException { if(input.isKeyDown(Input.KEY_SPACE)) player = movingRightSwingingSword; } Full Code package javagame; import org.newdawn.slick.*; import org.newdawn.slick.state.*; public class Play extends BasicGameState { Animation player, movingUp, movingDown, movingLeft, movingRight, movingRightSwingingSword; Image worldMap; boolean quit = false; int[] duration = {200,200}; float playerPositionX = 0; float playerPositionY = 0; float shiftX = playerPositionX + 320; float shiftY = playerPositionY + 160; public Play(int state) { } public void init(GameContainer gc, StateBasedGame sbg) throws SlickException { worldMap = new Image("res/world.png"); Image[] walkUp = {new Image("res/buckysBack.png"), new Image("res/buckysBack.png")}; Image[] walkDown = {new Image("res/buckysFront.png"), new Image("res/buckysFront.png")}; Image[] walkLeft = {new Image("res/buckysLeft.png"), new Image("res/buckysLeft.png")}; Image[] walkRight = {new Image("res/buckysRight.png"), new Image("res/buckysRight.png")}; Image[] attackRight = {new Image("res/buckysRightSword1.png"), new Image("res/buckysRightSword2.png")}; movingUp = new Animation(walkUp, duration, false); movingDown = new Animation(walkDown, duration, false); movingLeft = new Animation(walkLeft, duration, false); movingRight = new Animation(walkRight, duration, false); //doesnt work! vvv movingRightSwingingSword = new Animation(attackRight, duration, true); player = movingDown; } public void render(GameContainer gc, StateBasedGame sbg, Graphics g) throws SlickException { worldMap.draw(playerPositionX, playerPositionY); player.draw(shiftX, shiftY); g.drawString("Player X: " + playerPositionX + "\nPlayer Y: " + playerPositionY, 400, 20); if (quit == true) { g.drawString("Resume (R)", 250, 100); g.drawString("MainMenu (M)", 250, 150); g.drawString("Quit Game (Q)", 250, 200); if (quit==false) { g.clear(); } } } public void update(GameContainer gc, StateBasedGame sbg, int delta) throws SlickException { Input input = gc.getInput(); if(input.isKeyDown(Input.KEY_UP)) { player = movingUp; playerPositionY += delta * .1f; if(playerPositionY>162) playerPositionY -= delta * .1f; } if(input.isKeyDown(Input.KEY_DOWN)) { player = movingDown; playerPositionY -= delta * .1f; if(playerPositionY<-600) playerPositionY += delta * .1f; } if(input.isKeyDown(Input.KEY_RIGHT)) { player = movingRight; playerPositionX -= delta * .1f; if(playerPositionX<-840) playerPositionX += delta * .1f; } if(input.isKeyDown(Input.KEY_LEFT)) { player = movingLeft; playerPositionX += delta * .1f; if(playerPositionX>318) playerPositionX -= delta * .1f; } if(input.isKeyDown(Input.KEY_SPACE)) player = movingRightSwingingSword; if(input.isKeyDown(Input.KEY_ESCAPE)) quit = true; if(input.isKeyDown(Input.KEY_R)) if (quit == true) quit = false; if(input.isKeyDown(Input.KEY_M)) if (quit == true) {sbg.enterState(0); quit = false;} if(input.isKeyDown(Input.KEY_Q)) if (quit == true) System.exit(0); } public int getID() { return 1; } }

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  • What exactly is a "key container"?

    - by saugata
    Is it something specific, with a definite structure, or just an arbitrary data file with some form of encryption to hold keys, and potentially other secret information? Can someone please explain the term or point me to a link.

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  • Add a foreign key to existing tables in Rails (MySQL)

    - by randombits
    What's the best way to add foreign keys to my existing tables in Rails with an underlying MySQL database? clearly the solution should be done in a migration, as I want this versioned. Otherwise I'd create the constraints myself. I can't seem to find one, conducive response to they above. Again, the tables have already been created with previous migrations. I'm just going back now and adding referential integrity wherever it's applicable.

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  • (Python) algorithm to randomly select a key based on proportionality/weight

    - by LaundroMat
    Hi - I'm a bit at a loss as to how to find a clean algorithm for doing the following: Suppose I have a dict k: >>> k = {'A': 68, 'B': 62, 'C': 47, 'D': 16, 'E': 81} I now want to randomly select one of these keys, based on the 'weight' they have in the total (i.e. sum) amount of keys. >>> sum(k.values()) >>> 274 So that there's a >>> 68.0/274.0 >>> 0.24817518248175183 24.81% percent change that A is selected. How would you write an algorithm that takes care of this? In other words, that makes sure that on 10.000 random picks, A will be selected 2.481 times?

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  • c# winforms events restore textbox contents on escape

    - by aj3jr
    Using c# in 2008 Express. I have a textbox containing a path. I append a "\" at the end on Leave Event. If the user presses 'Escape' key I want the old contents to be restored. When I type over all the text and press 'Escape' I hear a thump and the old text isn't restored. Here what I have so far ... public string _path; public string _oldPath; this.txtPath.KeyPress += new System.Windows.Forms.KeyPressEventHandler(txtPath_CheckKeys); this.txtPath.Enter +=new EventHandler(txtPath_Enter); this.txtPath.LostFocus += new EventHandler(txtPath_LostFocus); public void txtPath_CheckKeys(object sender, KeyPressEventArgs kpe) { if (kpe.KeyChar == (char)27) { _path = _oldPath; } } public void txtPath_Enter(object sender, EventArgs e) { //AppendSlash(sender, e); _oldPath = _path; } void txtPath_LostFocus(object sender, EventArgs e) { //throw new NotImplementedException(); AppendSlash(sender, e); } public void AppendSlash(object sender, EventArgs e) { //add a slash to the end of the txtPath string on ANY change except a restore this.txtPath.Text += @"\"; } Thanks in advance,

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  • what's the performance difference between int and varchar for primary keys

    - by user568576
    I need to create a primary key scheme for a system that will need peer to peer replication. So I'm planning to combine a unique system ID and a sequential number in some way to come up with unique ID's. I want to make sure I'll never run out of ID's, so I'm thinking about using a varchar field, since I could always add another character if I start running out. But I've read that integers are better optimized for this. So I have some questions... 1) Are integers really better optimized? And if they are, how much of a performance difference is there between varchars and integers? I'm going to use firebird for now. But I may switch later. Or possibly support multiple db's. So I'm looking for generalizations, if that's possible. 2) If integers are significantly better optimized, why is that? And is it likely that varchars will catch up in the future, so eventually it won't matter anyway? My varchar keys won't have any meaning, except for the unique system ID part. But I may want to obscure that somehow. Also, I plan to efficiently use all the bits of each character. I don't, for example, plan to code the integer 123 as the character string "123". So I don't think varchars will require more space than integers.

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