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  • Rails: Helpers and Models - where to organize code

    - by Sam
    More and more I'm putting all of my code in models and helpers concerning MVC. However, sometimes I'm not sure where to organize code. Should it go into the model or should it go into a helper. What are the benefits of each. Is one faster or are they the same. I've heard something about all models getting cached so it seems then like that would be a better place to put most of my code. For example here is a scenario that works in a model or in helper: def status if self.purchased "Purcahsed" elsif self.confirmed "Confirmed" elsif self.reserved "Reserved" else "Pending" end end I don't need to save this status as in the database because there are boolean fields for purchased, and confirmed, and reserved. So why put this in a model or why put it into a helper? So I'm not sure of the best practice or benefits gained on putting code into a model or into helper if it can be in both.

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  • MySQL: Transactions across multiple threads

    - by Zombies
    Preliminary: I have an application which maintains a thread pool of about 100 threads. Each thread can last about 1-30 seconds before a new task replaces it. When a thread end, that thread almost always will result in inserting 1-3 records into a table, this table is used by all of the threads. Right now, no transactional support exists, but I am trying to add that now. So... Goal I want to implement a transaction for this. The rules for whether or not this transaction commits or rollback reside in the main thread. Basically there is a simple function that will return a boolean. Can I implement a transaction across multiple connections? If not, can multiple threads share the same connection? (Note: there are a LOT of inserts going on here, and that is a requirement).

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  • What to name an array of flags?

    - by Chris
    I have a project where lots of the objects hold state by maintaining simple boolean flags. There are lots of these, so I maintain them within a uint32_t and use bit masking. There are now so many flags to keep track of, I've created an abstraction for them (just a class wrapping the uint32_t) with set(), clear(), etc. My question: What's a nice accurate, concise name for this class? What name could I give this class so that you'd have a reasonable idea what it was [for] knowing the name only? Some ideas I had: FlagBank FlagArray etc Any ideas? Thanks in advance! Cheers, -Chris

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  • Cascading S3 Sink Tap not being deleted with SinkMode.REPLACE

    - by Eric Charles
    We are running Cascading with a Sink Tap being configured to store in Amazon S3 and were facing some FileAlreadyExistsException (see [1]). This was only from time to time (1 time on around 100) and was not reproducable. Digging into the Cascading codem, we discovered the Hfs.deleteResource() is called (among others) by the BaseFlow.deleteSinksIfNotUpdate(). Btw, we were quite intrigued with the silent NPE (with comment "hack to get around npe thrown when fs reaches root directory"). From there, we extended the Hfs tap with our own Tap to add more action in the deleteResource() method (see [2]) with a retry mechanism calling directly the getFileSystem(conf).delete. The retry mechanism seemed to bring improvement, but we are still sometimes facing failures (see example in [3]): it sounds like HDFS returns isDeleted=true, but asking directly after if the folder exists, we receive exists=true, which should not happen. Logs also shows randomly isDeleted true or false when the flow succeeds, which sounds like the returned value is irrelevant or not to be trusted. Can anybody bring his own S3 experience with such a behavior: "folder should be deleted, but it is not"? We suspect a S3 issue, but could it also be in Cascading or HDFS? We run on Hadoop Cloudera-cdh3u5 and Cascading 2.0.1-wip-dev. [1] org.apache.hadoop.mapred.FileAlreadyExistsException: Output directory s3n://... already exists at org.apache.hadoop.mapreduce.lib.output.FileOutputFormat.checkOutputSpecs(FileOutputFormat.java:132) at com.twitter.elephantbird.mapred.output.DeprecatedOutputFormatWrapper.checkOutputSpecs(DeprecatedOutputFormatWrapper.java:75) at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:923) at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:882) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:396) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1278) at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:882) at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:856) at cascading.flow.hadoop.planner.HadoopFlowStepJob.internalNonBlockingStart(HadoopFlowStepJob.java:104) at cascading.flow.planner.FlowStepJob.blockOnJob(FlowStepJob.java:174) at cascading.flow.planner.FlowStepJob.start(FlowStepJob.java:137) at cascading.flow.planner.FlowStepJob.call(FlowStepJob.java:122) at cascading.flow.planner.FlowStepJob.call(FlowStepJob.java:42) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.j [2] @Override public boolean deleteResource(JobConf conf) throws IOException { LOGGER.info("Deleting resource {}", getIdentifier()); boolean isDeleted = super.deleteResource(conf); LOGGER.info("Hfs Sink Tap isDeleted is {} for {}", isDeleted, getIdentifier()); Path path = new Path(getIdentifier()); int retryCount = 0; int cumulativeSleepTime = 0; int sleepTime = 1000; while (getFileSystem(conf).exists(path)) { LOGGER .info( "Resource {} still exists, it should not... - I will continue to wait patiently...", getIdentifier()); try { LOGGER.info("Now I will sleep " + sleepTime / 1000 + " seconds while trying to delete {} - attempt: {}", getIdentifier(), retryCount + 1); Thread.sleep(sleepTime); cumulativeSleepTime += sleepTime; sleepTime *= 2; } catch (InterruptedException e) { e.printStackTrace(); LOGGER .error( "Interrupted while sleeping trying to delete {} with message {}...", getIdentifier(), e.getMessage()); throw new RuntimeException(e); } if (retryCount == 0) { getFileSystem(conf).delete(getPath(), true); } retryCount++; if (cumulativeSleepTime > MAXIMUM_TIME_TO_WAIT_TO_DELETE_MS) { break; } } if (getFileSystem(conf).exists(path)) { LOGGER .error( "We didn't succeed to delete the resource {}. Throwing now a runtime exception.", getIdentifier()); throw new RuntimeException( "Although we waited to delete the resource for " + getIdentifier() + ' ' + retryCount + " iterations, it still exists - This must be an issue in the underlying storage system."); } return isDeleted; } [3] INFO [pool-2-thread-15] (BaseFlow.java:1287) - [...] at least one sink is marked for delete INFO [pool-2-thread-15] (BaseFlow.java:1287) - [...] sink oldest modified date: Wed Dec 31 23:59:59 UTC 1969 INFO [pool-2-thread-15] (HiveSinkTap.java:148) - Now I will sleep 1 seconds while trying to delete s3n://... - attempt: 1 INFO [pool-2-thread-15] (HiveSinkTap.java:130) - Deleting resource s3n://... INFO [pool-2-thread-15] (HiveSinkTap.java:133) - Hfs Sink Tap isDeleted is true for s3n://... ERROR [pool-2-thread-15] (HiveSinkTap.java:175) - We didn't succeed to delete the resource s3n://... Throwing now a runtime exception. WARN [pool-2-thread-15] (Cascade.java:706) - [...] flow failed: ... java.lang.RuntimeException: Although we waited to delete the resource for s3n://... 0 iterations, it still exists - This must be an issue in the underlying storage system. at com.qubit.hive.tap.HiveSinkTap.deleteResource(HiveSinkTap.java:179) at com.qubit.hive.tap.HiveSinkTap.deleteResource(HiveSinkTap.java:40) at cascading.flow.BaseFlow.deleteSinksIfNotUpdate(BaseFlow.java:971) at cascading.flow.BaseFlow.prepare(BaseFlow.java:733) at cascading.cascade.Cascade$CascadeJob.call(Cascade.java:761) at cascading.cascade.Cascade$CascadeJob.call(Cascade.java:710) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) at java.util.concurrent.FutureTask.run(FutureTask.java:138) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:619)

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  • Scrapy Could not find spider Error

    - by Nacari
    I have been trying to get a simple spider to run with scrapy, but keep getting the error: Could not find spider for domain:stackexchange.com when I run the code with the expression scrapy-ctl.py crawl stackexchange.com. The spider is as follow: from scrapy.spider import BaseSpider from __future__ import absolute_import class StackExchangeSpider(BaseSpider): domain_name = "stackexchange.com" start_urls = [ "http://www.stackexchange.com/", ] def parse(self, response): filename = response.url.split("/")[-2] open(filename, 'wb').write(response.body) SPIDER = StackExchangeSpider()` Another person posted almost the exact same problem months ago but did not say how they fixed it, http://stackoverflow.com/questions/1806990/scrapy-spider-is-not-working I have been following the turtorial exactly at http://doc.scrapy.org/intro/tutorial.html, and cannot figure out why it is not working.

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  • How can I capture multiple matches from the same Perl regex?

    - by Sho Minamimoto
    I'm trying to parse a single string and get multiple chunks of data out from the same string with the same regex conditions. I'm parsing a single HTML doc that is static (For an undisclosed reason, I can't use an HTML parser to do the job.) I have an expression that looks like: $string =~ /\<img\ssrc\="(.*)"/; and I want to get the value of $1. However, in the one string, there are many img tags like this, so I need something like an array returned (@1?) is this possible?

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  • How to convert an arbitrary object to String with JSTL? (calling toString())

    - by hstoerr
    Is there any way to call toString() on an object with the JSTL? (I need the String representation of an enum as index in a map in a JSP EL expression.) I hoped something like ${''+object} would work like in java, but JSTL isn't that nice, and there does not seem to be any function that does it. Clarification: I have a variable somemap that maps Strings to Strings, and I have a variable someenum that is an enumeration. I'd like to do something like ${somemap[someenum.toString()]}. (Of course .toString() does not work, but what does?)

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  • Do we need HyperJAXB generated hashCode & equals methods?

    - by Marcus
    We've generated some (well a lot) of classes using HyperJAXB. All of the classes implement Equals and HashCode and have the implementation style below. Appears this code is never executed.. is there any particular reason we need this code? I'm looking to simplify the classes if we can. public boolean equals(Object object) { if (!(object instanceof MyClass)) { return false; } if (this == object) { return true; } final EqualsBuilder equalsBuilder = new JAXBEqualsBuilder(); equals(object, equalsBuilder); return equalsBuilder.isEquals(); } public void hashCode(HashCodeBuilder hashCodeBuilder) { hashCodeBuilder.append(this.getValue()); hashCodeBuilder.append(this.getId()); } public int hashCode() { final HashCodeBuilder hashCodeBuilder = new JAXBHashCodeBuilder(); hashCode(hashCodeBuilder); return hashCodeBuilder.toHashCode(); }

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  • ListView and undeterminate ProgressBar

    - by Spredzy
    Sorry for the question it might sounds stupid, But: how do you activate a ProgressBar according to the cell you just cliked on ? I have a list view, with a menu that shows after a long press. When I click on one of my option I would like to display the ProgressBar in the listView according to the cell I clicked on. It is currently always displaying the one of my first cell, whatever I am doing public boolean onContextItemSelected(MenuItem item) { AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo(); switch (item.getOrder()) { case 0: mProgressBar = (ProgressBar)findViewById(R.id.welcome_progressbar); mProgressBar.setVisibility(View.VISIBLE); ... some execution .... return true; case 1: ... Does anyone see anything wrong?

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  • Would an ORM have any way of determining that a SQLite column contains date-times or booleans?

    - by DanM
    I've been thinking about using SQLite for my next project, but I'm concerned that it seems to lack proper datetime and bit data types. If I use DbLinq (or some other ORM) to generate C# classes, will the data types of the properties be "dumbed down"? Will date-time data be placed in properties of type string or double? Will boolean data be placed in properties of type int? If yes, what are the implications? I'm envisioning a scenario where I need to write a whole second layer of classes with more specific data types and do a bunch of transformations and casts, but maybe it's not as bad as I fear. If you have any experience with this or a similar scenario, how did you handle it?

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  • Overriding events of excel sheet using VBA

    - by Rashmi Pandit
    Hi, I need to programmatically override the following events of a worksheet: BeforeDoubleClick SelectionChange BeforeRightClick I have been able to override the OnActivate event using the following code: sheet.OnSheetActivate = "MyOwn_Activate" Private Sub MyOwn_Activate() myForm.Show End Sub I have implemented BeforeDoubleClick on similar lines: sheet.OnDoubleClick = "My_BeforeDoubleClick" Private Sub My_BeforeDoubleClick(ByVal Target As Range, Cancel As Boolean) ... End Sub However, an 'argument not optional' error is thrown at run-time when user double clicks a cell on the sheet. Can someone please suggest how should I pass the paramters? In addition, I am not able to find event names for SelectionChange & BeforeRightClick. I tried: sheet.BeforeRightClick = "My_BeforeRightClick" sheet.SelectionChange = "My_SelectionChange" But, both the above lines do not work. Any help/ suggestion is greatly appreciated. Thanks :)

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  • Dealing with ArrayLists in java...all members of the arraylist updating themselves?

    - by Charlie
    I have a function that shrinks the size of a "Food bank" (represented by a rectangle in my GUI) once some of the food has been taken. I have the following function check for this: public boolean tryToPickUpFood(Ant a) { int xCoord = a.getLocation().x; int yCoord = a.getLocation().y; for (int i = 0; i < foodPiles.size(); i++) { if (foodPiles.get(i).containsPoint(xCoord, yCoord)) { foodPiles.get(i).decreaseFood(); return true; } } return false; } Where decreaseFood shrinks the rectangle.. public void decreaseFood() { foodAmount -= 1; shrinkPile(); } private void shrinkPile() { WIDTH -=1; HEIGHT = WIDTH; } However, whenever one rectangle shrinks, ALL of the rectangles shrink. Why would this be?

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  • Cant create 2nd textbox

    - by okinaw55
    Having problems with this code and cant figure out why. It works fine the first time through but crashes with a Parameter is not Valid error the 2nd time on this line. Dim tbx As TextBox = New Windows.Forms.TextBox Any help is appreciated. Dim tbx As TextBox = New Windows.Forms.TextBox tbx.Name = tbxName tbx.Size = New System.Drawing.Size(55, 12) tbx.BorderStyle = BorderStyle.None tbx.TextAlign = HorizontalAlignment.Center Using f As Font = tbx.Font tbx.Font = New Font(f.FontFamily, 8, FontStyle.Bold) End Using tbx.Location = New System.Drawing.Point(xCords, 44) Select Case tbx.Name Case "tbxBulk01" : tbx.Text = Bulk01Label Case "tbxBulk02" : tbx.Text = Bulk02Label End Select Me.Controls.Add(tbx) Stack trace as follows. at System.Drawing.Font.GetHeight(Graphics graphics) at System.Drawing.Font.GetHeight() at System.Drawing.Font.get_Height() at System.Windows.Forms.Control.get_FontHeight() at System.Windows.Forms.TextBoxBase.get_PreferredHeight() at System.Windows.Forms.TextBoxBase.get_DefaultSize() at System.Windows.Forms.Control..ctor(Boolean autoInstallSyncContext) at System.Windows.Forms.TextBoxBase..ctor() at System.Windows.Forms.TextBox..ctor()

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  • Strange Scala error.

    - by Lukasz Lew
    I tried to create abstract turn based Game and abstract AI: abstract class AGame { type Player type Move // Player inside def actPlayer : Player def moves (player : Player) : Iterator[Move] def play (move : Move) def undo () def isFinished : Boolean def result (player : Player) : Double } abstract class Ai[Game <: AGame] { def genMove (player : Game#Player) : Game#Move } class DummyGame extends AGame { type Player = Unit type Move = Unit def moves (player : Player) = new Iterator[Move] { def hasNext = false def next = throw new Exception ("asd") } def actPlayer = () def play (move : Move) { } def undo () { } def isFinished = true def result (player : Player) = 0 } class DummyAi[Game <: AGame] (game : Game) extends Ai[Game] { override def genMove (player : Game#Player) : Game#Move = { game.moves (player).next } } I thought that I have to use this strange type accessors like Game#Player. I get very puzzling error. I would like to understand it: [error] /home/lew/Devel/CGSearch/src/main/scala/Main.scala:41: type mismatch; [error] found : Game#Player [error] required: DummyAi.this.game.Player [error] game.moves (player).next [error] ^

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  • SQL - How can I apply a "semi-unique" constraint?

    - by Erin Drummond
    Hi, I have a (simplified) table consisting of three columns: id INT PRIMARY KEY NOT NULL AUTO_INCREMENT, foreignID INT NOT NULL, name VARCHAR NOT NULL Basically, I would like to add a constraint (at the database level rather than at the application level) where it only possible for one unique 'name' to exist per foreignID. For example, given the data (id, foreignid, name): 1,1,Name1 2,1,Name2 3,1,Name3 4,2,Name1 5,2,Name2 I want the constraint to fail if the user tries to insert another 'Name3' under foreignId 1, but succeed if the user tries to insert 'Name3' under foreignId 2. For this reason I cannot simply make the whole column UNIQUE. I am having difficulty coming up with a SQL expression to achieve this, can anybody help me? Thanks

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  • Riddle: Spot the serious bug in this bubble sort implementation

    - by ripper234
    (No, this isn't a homework assignment, I just found the bug and thought it might be useful to share it here) import java.util.List; public class BubbleSorter { public <T extends Comparable<T>> void sort(List<T> list) { while (true) { boolean didWork = false; for (int i = 0; i < list.size() - 1; ++i) { if (list.get(i).compareTo(list.get(i + 1)) > 0) { swap(list, i, i + 1); didWork = true; break; } } if (!didWork) return; } } private static <T> void swap(List<T> list, int i, int j) { T tmp = list.get(i); list.set(i, list.get(j)); list.set(j, tmp); } }

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  • jQuery 1.4.x and the @ symbol

    - by David
    I used to use this script for jquery email obfuscation: $(".replaceAt").replaceWith("@"); $(".obfuscate").each(function () { $(this).attr("href", "mailto:"+$(this).text()); }); <a class="obfuscate">name<span class="replaceAt">-AT-</span>server.com</a> But with jQuery 1.4.x, I now get this error: uncaught exception: Syntax error, unrecognized expression: @ Looking this up on the net, it looks like jQuery thinks that the @ is a special character. I tried to "\@" it and a few other things with not luck. I'm not enough of a jQuery ninja to know how to fix this. Any ideas?

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  • How to calculate unbound column value based on value of bound colum in DatagGridView?

    - by Wodzu
    Hi. I have few columns in my DataGridView, one of them is an unbound column and the DataGridVIew is in VirtualMode. When CellValueNeeded event is called, I want to calculate value of Cells[0] basing on the value of Cells[2] which is in bounded column to the underlaying DataSource. This is how I try to do this: private void dgvItems_CellValueNeeded(object sender, DataGridViewCellValueEventArgs e) { e.Value = dgvItems.CurrentRow.Cells[2].Value * 5; //simplified example } However, I am getting System.StackOverflowException because it seams that call to dgvItems.CurrentRow.Cells[2].Value results in call to another CellValueNeeded event. And so on and so on... However Cells[2] is not an unbound column, so on common sense it should not result in recursive call unless getting value of any column(bound or unbound) firest that event... I can not use here SQL Expression and I can not precalculate e.Value in any SQL call. In real example Cells[2].Value is a key used in HashTable which will return a correct value for the Cells[0] (e.Value). What can I do?

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  • problem with null column

    - by Iulian
    One column in my database (of type double) has some null values. I am executing a sored procedure to get the data in my app wipDBTableAdapters.XLSFacturiTableAdapter TAFacturi = new wipDBTableAdapters.XLSFacturiTableAdapter(); var dtfacturi = TAFacturi.GetData(CodProiect); Then i try to do something like this: if (dtfacturi[i].CANTITATE == null) { //do something } this is giving a warning : The result of the expression is always 'false' since a value of type 'double' is never equal to 'null' of type 'double? However when i run my code i get the following exception: StrongTypingException The value for column 'CANTITATE' in table 'XLSFacturi' is DBNull. How am I supposed to resolve this ?

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  • Regex to identify rows that do not contain exact number of occurences of quotemark character using Notepad++

    - by SamAspin
    I would like to be able to jump to rows that dont contain 6 quotemarks in a quoted-CSV file as it feels like a good way to identify broken rows. I think using a regular expression with Notepad++'s find features would be a sensible approach but I'm not sure how to pick the rows up. 6 quotemarks (") would suggest a complete row so I want to skip to any row that does not contain 6. Here is some sample data to play with, in this example its the 4th line I'd like to jump to "sam","mark","dave" "sam","mark","dave" "sam","mark","dave" "sam","mark"," dave" "sam","mark","dave" "sam","mark","dave"

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  • Iserializable to serialize readonly methods to be sent through webservice

    - by george9170
    I am sending an object through a webservice with readonly methods. I am using the Iserializable interface, assuming that I would no longer need a parameterless constructor. This is not true and I still cannot send my object over the wire. public class Foo: ISerializable { public boolean IsBusy { get; private set;} protected Foo(SerializationInfo info, StreamingContext context) { this.IsBusy = info.GetBoolean("IsBusy"); } void ISerializable.GetObjectData(SerializationInfo info, StreamingContext context) { .AddValue("IsBusy", this.IsBusy); }

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  • Getting an odd error, MSSQL Query using `WITH` clause

    - by Aren B
    The following query: WITH CteProductLookup(ProductId, oid) AS ( SELECT p.ProductID, p.oid FROM [dbo].[ME_CatalogProducts] p ) SELECT rel.Name as RelationshipName, pl.ProductId as FromProductId, pl2.ProductId as ToProductId FROM ( [dbo].[ME_CatalogRelationships] rel INNER JOIN CteProductLookup pl ON pl.oid = rel.from_oid ) INNER JOIN CteProductLookup pl2 ON pl2.oid = rel.to_oid WHERE rel.Name = 'BundleItem' AND pl.ProductId = 'MX12345'; Is generating this error: Msg 319, Level 15, State 1, Line 5 Incorrect syntax near the keyword 'with'. If this statement is a common table expression, an xmlnamespaces clause or a change tracking context clause, the previous statement must be terminated with a semicolon. On execution only. There are no errors/warnings in the sql statement in the managment studio. Any ideas?

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  • count of distinct acyclic paths from A[a,b] to A[c,d]?

    - by Sorush Rabiee
    I'm writing a sokoban solver for fun and practice, it uses a simple algorithm (something like BFS with a bit of difference). now i want to estimate its running time ( O and omega). but need to know how to calculate count of acyclic paths from a vertex to another in a network. actually I want an expression that calculates count of valid paths, between two vertices of a m*n matrix of vertices. a valid path: visits each vertex 0 or one times. have no circuits for example this is a valid path: but this is not: What is needed is a method to find count of all acyclic paths between the two vertices a and b. comments on solving methods and tricks are welcomed.

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  • Scala 2.8: use Java annotation with an array parameter

    - by yournamehere
    I'm trying to implement an JavaEE Session Bean with Scala 2.8. Because it's a Remote Session Bean, i have to annotate it with the following Java Annotation: @Target({ElementType.TYPE}) @Retention(RetentionPolicy.RUNTIME) public @interface Remote { Class[] value() default {}; } I only found this example for scala 2.7. In Scala 2.7, its possible to define the session bean like this: @Remote {val value = Array(classOf[ITest])} class MyEJB ... How can i use this annotation the same way with Scala 2.8? I already tried many different versions, all resulting in "annotation argument needs to be a constant", "illegal start of simple expression". All of these definitions don't work: @Remote{val value = Array(classOf[PersonScalaEJB])} @Remote(val value = Array(classOf[PersonScalaEJB])) @Remote(Array(classOf[PersonScalaEJB]))

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  • Create Sum of calculated rows in Microsoft Reporting Services

    - by kd7iwp
    This seems like it should be simple but I can't find anything yet. In Reporting Services I have a table with up to 6 rows that all have calculated values and dynamic visibility. I would like to sum these rows. Basically I have a number of invoice items and want to make a total. I can't change anything on the DB side since my stored procedures are used elsewhere in the system. Each row pulls data from a different dataset as well, so I can't do a sum of the dataset. Can I sum all the rows with a table footer? Similarly to totaling a number of rows in Excel? It seems very redundant to put my visibility expression from each row into my footer row to calculate the sum.

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