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• Can content provider notify observer without calling NotifyChange() explicity - Android

  - by Amit

  In ContentProvider we explicity notify all registered observers to it by calling getContext().getResolver().notifyChange(URI,ContentObserver); I want to know if this is necessary. Is there any possibility that observers get notified, even we don't use that statement at all in our contentProvider. Is there any other way to do the same thing.

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• if else within CTE ?

  - by stackoverflowuser

  I want to execute select statement within CTE based on a codition. something like below ;with CTE_AorB ( if(condition) select * from table_A else select * from table_B ), CTE_C as ( select * from CTE_AorB // processing is removed ) But i get error on this. Is it possible to have if else within CTEs? If not is there a work around Or a better approach. Thanks.

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• I cnn't use Database in SQL Azure!

  - by Nahid

  Hi, I am trying to use a Database in SQL AZURE. I have installed SQL Server 2008. I can Login SQL Azure and can use master Database. But I can't use other Database and I can't see any things in my object explorer. Its Show Error: "USE statement is not supported to switch between databases. Use a new connection to connect to a different Database." How can I use other database?

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• How can I create a list of classes in C# to iterate over in a loop

  - by Jean-Bernard Pellerin

  Suppose I have class animal and classes cat and dog extending it. I want to do something along the lines of: foreach (animal a in {cat, dog}) if (a.isValid(parameters)) doStuff(); My only alternative is a switch statement for each class, something I'd like to avoid. Thanks, J-B

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• Selecting only the first item of an xpath result set in PHP

  - by IkimashoZ

  I am currently achieving the desired outcome with two PHP statements: $thisBlarg = $xmlResource->xpath('//blarg[@ID='.$someBlargID.']'); echo $thisBlarg[0]->name; But, not wanting to settle for second best, I'd really prefer this to be one statement, but PHP doesn't like this: echo $xmlResource->xpath('//blarg[@ID='.$someBlargID.']')[0]->name; And for good reason. But I can't find a way to force an xpath query to return the result directly. Any suggestions?

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• Asp.net: Implementing Auto-Logout functionality

  - by renegadeMind

  Hi, I have to implement auto-logout functionality in one of my projects and i just cant figure out where to start looking for ideas but SO. What i need is for the application to redirect the user to the login page if the user session has expired. Please tell me as to what should be my approach to tackle this requirement. Problem Statement: If the user leaves the system for more than n minutes in any given log-in instance, the system should automatically log them off.

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• Why is overloading operator&() prohibited for classes stored in STL containers?

  - by sharptooth

  Suddenly in this article ("problem 2") I see a statement that C++ Standard prohibits using STL containers for storing elemants of class if that class has an overloaded operator&(). Having overloaded operator&() can indeed be problematic, but looks like a default "address-of" operator can be used easily through a set of dirty-looking casts that are used in boost::addressof() and are believed to be portable and standard-compilant. Why is having an overloaded operator&() prohibited for classes stored in STL containers while the boost::addressof() workaround exists?

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• Define keys in temporary table creation

  - by imperium2335

  How do I define the keys for a temporary table that is being created from a SELECT statement? I have: CREATE temporary TABLE _temp_unique_parts_trading engine=memory AS (SELECT parts_trading.enquiryref, sellingcurrency, jobs.id AS jobID FROM parts_trading, jobs WHERE jobs.enquiryref = parts_trading.enquiryref GROUP BY parts_trading.enquiryref) But where do I define the keys?

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• Question about JSON?

  - by Alex

  Hi all, I have a fairly simple question: In Javascript how can I return the boolean (if its found in the JSON) rather than the actual value? Example: var myJSON = { "foo" : "bar", "bar" : "foo" }; var keyToLookFor = "foo"; var found = myJSON[keyToLookFor]; if (found) { // I know I can test if the string exists in the if } // but is there a way I could just return something like: return found; // instead of testing found in the if statement and then returning true?

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• Java java.util.ConcurrentModificationException error

  - by vijay

  Hi all, please can anybody help me solve this problem last so many days I could not able to solve this error. I tried using synchronized method and other ways but did not work so please help me Error java.util.ConcurrentModificationException at java.util.AbstractList$Itr.checkForComodification(Unknown Source) at java.util.AbstractList$Itr.remove(Unknown Source) at JCA.startAnalysis(JCA.java:103) at PrgMain2.doPost(PrgMain2.java:235) Code public synchronized void startAnalysis() { //set Starting centroid positions - Start of Step 1 setInitialCentroids(); Iterator<DataPoint> n = mDataPoints.iterator(); //assign DataPoint to clusters loop1: while (true) { for (Cluster c : clusters) { c.addDataPoint(n.next()); if (!n.hasNext()) break loop1; } } //calculate E for all the clusters calcSWCSS(); //recalculate Cluster centroids - Start of Step 2 for (Cluster c : clusters) { c.getCentroid().calcCentroid(); } //recalculate E for all the clusters calcSWCSS(); // List copy = new ArrayList(originalList); //synchronized (c) { for (int i = 0; i < miter; i++) { //enter the loop for cluster 1 for (Cluster c : clusters) { for (Iterator<DataPoint> k = c.getDataPoints().iterator(); k.hasNext(); ) { // synchronized (k) { DataPoint dp = k.next(); System.out.println("Value of DP" +dp); //pick the first element of the first cluster //get the current Euclidean distance double tempEuDt = dp.getCurrentEuDt(); Cluster tempCluster = null; boolean matchFoundFlag = false; //call testEuclidean distance for all clusters for (Cluster d : clusters) { //if testEuclidean < currentEuclidean then if (tempEuDt > dp.testEuclideanDistance(d.getCentroid())) { tempEuDt = dp.testEuclideanDistance(d.getCentroid()); tempCluster = d; matchFoundFlag = true; } //if statement - Check whether the Last EuDt is > Present EuDt } //for variable 'd' - Looping between different Clusters for matching a Data Point. //add DataPoint to the cluster and calcSWCSS if (matchFoundFlag) { tempCluster.addDataPoint(dp); //k.notify(); // if(k.hasNext()) k.remove(); for (Cluster d : clusters) { d.getCentroid().calcCentroid(); } //for variable 'd' - Recalculating centroids for all Clusters calcSWCSS(); } //if statement - A Data Point is eligible for transfer between Clusters. // }// syn } //for variable 'k' - Looping through all Data Points of the current Cluster. }//for variable 'c' - Looping through all the Clusters. }//for variable 'i' - Number of iterations. // syn }

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• many-to-one with multiple columns

  - by Sly

  I have a legacy data base and a relation one-to-one between two tables. The thing is that relation uses two columns, not one. Is there some way to say in nhibernate that when getting a referenced entity it used two columns in join statement, not one? I'm trying to use this: References(x => x.Template) .Columns() .PropertyRef() But can't get how to map join on multiple columns, any ideas?

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• C# How do I replace an actual asterisk character (*) in a Regex expression?

  - by fraXis

  Hello, I have a statement: I have a string such as content = "* test *" I want to search and replace it with so when I am done the string contains this: content = "(*) test (*)" My code is: content = Regex.Replace(content, "*", "(*)"); But this causes an error in C# because it thinks that the * is part of the Regular Expressions Syntax. How can I modify this code so it changes all asterisks in my string to (*) instead without causing a runtime error? Thanks.

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• Bulk update + SQL + self join

  - by Nev_Rahd

  Hello All I would like to update a column in Table with reference to other column(s) in same table. Ex: As in figure below - I would like to update effective endate with min date whichever is greater than effective Start Date of currrent record. How can this be acheived in T-SQL. Can this be done with single update statement ? Thanks.

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• How do you create a transaction that spans multiple statements in Python with MySQLdb?

  - by Fast Fish

  I know that with an InnoDB table, transactions are autocommit, however I understand that to mean for a single statement? For example, I want to check if a user exists in a table, and then if it doesn't, create it. However there lies a race condition. I believe using a transaction prior to doing the select, will ensure that the table remains untouched until the subsequent insert, and the transaction is committed. How can you do this with MySQLdb and Python?

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• filtering and though a sharepoint list items with powershell

  - by naijacoder

  I have tried below but not getting any result back Not sure if i'm doing this well. Can i filter in the foreach or in my if statement Thanks in advance [DateTime] $CreatedDate = $item["Created"] $convertedCreatedDate = $CreatedDate.ToString("yyyy-MM-dd") $today = (Get-Date).AddDays(-1).ToString("yyyy-MM-dd") foreach ($item in $list.items | where {$convertedCreatedDate -eq $today}) { if ($list.items | where {$convertedCreatedDate -eq $today}) { Write-Host $item["Created"] } Write-Host $item["Created"] }

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• cmd.exe: complex conditions?

  - by shoosh

  in DOS batch files, In an IF statement, is it possible to combine two or more conditions using AND or OR ? I was not able to find any documentation for that

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• Python combinations no repeat by constraint

  - by user2758113

  I have a tuple of tuples (Name, val 1, val 2, Class) tuple = (("Jackson",10,12,"A"), ("Ryan",10,20,"A"), ("Michael",10,12,"B"), ("Andrew",10,20,"B"), ("McKensie",10,12,"C"), ("Alex",10,20,"D")) I need to return all combinations using itertools combinations that do not repeat classes. How can I return combinations that dont repeat classes. For example, the first returned statement would be: tuple0, tuple2, tuple4, tuple5 and so on.

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• java hashmap flaws ?

  - by Tiberiu Hajas

  hi there, if (agents != null) for (Iterator iter = agents.keySet().iterator(); iter .hasNext();) { // some stuffs here } I have the following piece of java code, the agents is a hashmap, wondering if anyone can figure it out why on the line with "for" statement sometimes I got NPE ? is there any flaw with hashmaps ? thanks

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• What is mod_php...?

  - by SpikETidE

  Hi everybody... First of all, Pardon this complete n00b question... While going through the zend tutorial here i came across the following statement... Note that the php_flag settings in .htaccess only work if you are using mod_php. Can someone explain what that means...??? Thanks and Regards....

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• XCode / gdb debugger showing wrong value for boolean

  - by Sam

  Image says it all really. The debugger is stopped on the line immediately after this, inside the if statement. What is going on here? EDIT: this is debugging on device on an iPhone. I'm going to try the simulator and see if the same problem occurs.

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• running examples in package-Ex.R failed

  - by swarna

  Hi,My name is Swarna,I'm new to R,when i was checking my package i got a error message saying "Running examples in package-Ex.R failed" and series of statement saying where error might have occurred name of the package -package flush(stderr());flush(stdout()) name: title alias keywords Can any one please help me with this. Thank you,

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• Passing multiple parameters of same column to SQL Server select SP

  - by Bill

  I have a string value in the web.config — for example 2 guids seperated by a ",". I need to query the database dynamically (i.e i have no idea how many values could be seperated by a comma in the web.config) and run a select statement on the table passing these values and getting all that is relevant for example: select * from tablename where columnname = string1 string2 string3 etc etc some strings may only contain 1 guid some may contain 10

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• SQL Problem, WHERE Statment is wrong

  - by stck777

  $sql = 'SELECT id, DATE_FORMAT(date,"%d.%m.%Y - %H.%i Uhr") AS dat, user1, user2, p_user1, p_user2, be_user1, be_user2, win FROM kok_1on1_matches WHERE user1="$user" OR user2="$user"'; What is wrong with the WHERE statement?

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• How to track down a double free or corruption error in C++ with gdb

  - by Phenom

  When I run my C++ program it crashes with this error. * glibc detected ./load: double free or corruption (!prev): 0x0000000000c6ed50 ** I'm trying to track it down using cout statement but am finding it difficult. Could gdb make this easier? How is it done?

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• Python: inserting double or single quotes around a string

  - by Jessy

  Im using python to access a MySQL database and im getting a unknown column in field due to quotes not being around the variable. code below: cur = x.cnx.cursor() cur.execute('insert into tempPDBcode (PDBcode) values (%s);' % (s)) rows = cur.fetchall() How do i manually insert double or single quotes around the value of s? I've trying using str() and manually concatenating quotes around s but it still doesn't work. The sql statement works fine iv double and triple check my sql query.

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