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• Extracting Data Daily from MySQL to a Local MySQL DB

  - by Sunny Juneja

  I'm doing some experiments locally that require some data from a production MySQL DB that I only have read access to. The schemas are nearly identical with the exception of the omission of one column. My goal is to write a script that I can run everyday that extracts the previous day's data and imports it into my local table. The part that I'm most confused about is how to download the data. I've seen names like mysqldump be tossed around but that seems a way to replicate the entire database. I would love to avoid using php seeing as I have no experience with it. I've been creating CSVs but I'm worried about having the data integrity (what if there is a comma in a field or a \n) as well as the size of the CSV (there are several hundred thousand rows per day).

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• Deleting inline model in Django admin

  - by Overclocked

  I am trying to use Django admin to remove an inline model. I get an error saying [u'Select a valid choice. That choice is not one of the available choices.'] I check the location where the exception is raised. It seems like the inline model was removed, then a form validation happened on the parent model with the deleted inline model still as value of the form. That caused the failure. In my admin model, I had a save_formset method defined, that called formset.save(commit=False). Is the commit=False not telling Django to not delete the related models? Thanks.

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• How to implement an abstract class in ruby?

  - by Chirantan

  I know there is no concept of abstract class in ruby. But if at all it needs to be implemented, how to go about it? I tried something like... class A def self.new raise 'Doh! You are trying to instantiate an abstract class!' end end class B < A ... ... end But when I try to instantiate B, it is internally going to call A.new which is going to raise the exception. Also, modules cannot be instantiated but they cannot be inherited too. making the new method private will also not work. Any pointers?

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• Using Drools to provide error processing and consequence management

  - by Mike

  Hi, I am working on a module whose purpose is to process Java exceptions and decide upon a strategy for dealing with them. The exceptions could be things I know about (explicit business exceptions eg TransformationException) or more general environmental stuff (JMS errors, IO errors etc) The facts inserted into the knowledge base are all the same class, and wrap (contain) an Exception. I want to write a rule that will explicitly match the exceptions I know how to deal with (eg TransformationException) and have another rule that catches 'everything else' The problem seems to me to be that for a fact containing a TransformationException, both rules will fire and the output will be uncertain. How would I go about writing such exclusive rules without relying on salience to steer the order of execution (this seems to be bad practice from what I have read)? I have a solution in place that I am not happy with whereby the outcome depends on the order in which the rules are defined in my .drl.

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• Windows service Null ReferenceException

  - by Patrick

  I built a windows service on my local machine. when I install and run it locally it works perfectly fine. When I try to move it to my production machine I get a null reference exception error. I've created an installation package that also works perfectly fine on my machine, but when i run it on the production machine the service still fails. The service references a .dll that in turn has references to 3 other dlls. when i build the project it pulls all of the dlls into the debug folder for the project... I've even installed the service from that folder and it works localy on my machine. I know this has to have something to do with the references, but this is beyond me. Any tips/hints would be appreciated.

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• Java, merging two arrays evenly

  - by user2435044

  What would be the best way to merge two arrays of different lengths together so they are evenly distributed in the new array? Say I have the following arrays String[] array1 = new String[7]; String[] array2 = new String[2]; String[] mergedArray = new String[array1.length + array2.length]; I would want mergedArray to have the following elements array1 array1 array1 array2 array1 array1 array1 array2 array1 but if I were to change the size of the arrays to String[] array1 = new String[5]; String[] array2 = new String[3]; String[] mergedArray = new String[array1.length + array2.length]; then I would want it to be array1 array2 array1 array2 array1 array2 array1 array1 basically if it can be helped each array2 element shouldn't be touching each other; exception if array2 has a size larger than array1.

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• db2 jdbc driver does not release table locks

  - by as

  situation: We have a web service running on tomcat accessing DB2 database on AS400, we are using JTOPEN drivers for JNDI connections handled by tomcat. For handling transactions and access to database we are using Spring. For each select system takes JDBC connection from JNDI (i.e. from connection pool), does selection, and in the end it closes ResultSet, Statement and releases Connection in that order. That passes fine, shared lock on table dissappears. When we want to do update the same way as we did with select (exception on ResultSet object, we don't have one in such situation), after releasing Connection to JNDI lock on table stays. If we put maxIdle=0 for number of connections in JNDI configuration, this problem disappears, but this degrades performances, we have cca 100 users online on that service, we need few connections to be alive in pool. What do you suggest?

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• Selectively parsing log files using Java

  - by GPX

  I have to parse a big bunch of log files, which are in the following format. SOME SQL STATEMENT/QUERY DB20000I The SQL command completed successfully. SOME OTHER SQL STATEMENT/QUERY DB21034E The command was processed as an SQL statement because it was not a valid Command Line Processor command. EDIT 1: The first 3 lines (including a blank line) indicate an SQL statement executed successfully, while the next three show the statement and the exception it caused. darioo's reply below, suggesting the use of grep instead of Java, works beautifully for a single line SQL statement. EDIT 2: However, the SQL statement/query might not be a single line, necessarily. Sometimes it is a big CREATE PROCEDURE...END PROCEDURE block. Can this problem be overcome using only Unix commands too? Now I need to parse through the entire log file and pick all occurrences of the pair of (SQL statement + error) and write them in a separate file. Please show me how to do this!

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• Entity Framework This property descriptor does not support the SetValue

  - by Gayan

  Hello guys, below are my entities which i have created using entity frame work. retailer id name childs(navigation) generated database schema [Id] [int] IDENTITY(1,1) NOT NULL, [Name] nvarchar NOT NULL childern id name RETAILER(navigation) generated database schema [Id] [int] IDENTITY(1,1) NOT NULL, [name] nvarchar NOT NULL [Retailer_Id] [int] NOT NULL, As you can see in the above model the relationship is 1 retailer can have 0 or 1 child. my problem is when i create a new child and set the retailer navigation property of it to a retailer entity it throws the following exception.how do i solve it Error while setting property 'retailer': 'This property descriptor does not support the SetValue method.'.

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• Is this bad style of programming(C#) ?

  - by m0s

  Hi, so in my program I have parts where I use try catch blocks like this try { DirectoryInfo dirInfo = new DirectoryInfo(someString); //I don't know if that directory exists //I don't know if that string is valid path string... it could be anything //Some operations here } catch(Exception iDontCareWhyItFailed) { //Didn't work? great... we will say: somethings wrong, try again/next one } Of course I probably could do checks to see if the string is valid path (regex), then I would check if directory exists, then I could catch various exceptions to see why my routine failed and give more info... But in my program it's not really necessary. Now I just really need to know if this is acceptable, and what would a pro say/think about that. Thanks a lot for attention.

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• Add progressbar to BZip2CompressorInputStream

  - by bordeux

  This is my code: public void extract(String input_f, String output_f){ int buffersize = 1024; FileInputStream in; try { in = new FileInputStream(input_f); FileOutputStream out = new FileOutputStream(output_f); BZip2CompressorInputStream bzIn = new BZip2CompressorInputStream(in); final byte[] buffer = new byte[buffersize]; int n = 0; while (-1 != (n = bzIn.read(buffer))) { out.write(buffer, 0, n); } out.close(); bzIn.close(); } catch (Exception e) { throw new Error(e.getMessage()); } } How can i add progress bar to extract task, or how can i get the compressed file size?

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• global security manager in flex

  - by ron

  hi, I made a swf that interacts with other site on the internet (which has a crossdomainfile for me). in the main.mxml there is a definition of webservice (mx:WebService)(which is not in my domain). Therefore when loading the swf, there is a first call to crossdomainfile.xml. I put this swf on my server so that my clients can get it. When i connect to my server to download the swf, i expect to be asked if i want to allow the swf connect to foreign webservice domain. But i am not being asked. Do i always need to define exception in Global Security Settings panel? I don't want my client do define special things.. Is there a best practice for that? Why when i surfing the net other swf can do this? I read about the FlashPlayerTrust, can i define there a website i trust my swf will connect to? anyone knows?

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• How to map an interface in nhibernate?

  - by Josh

  I'm using two class NiceCustomer & RoughCustomer which implment the interface ICustomer. The ICustomer has four properties. They are: 1) Property Id() As Integer 2) Property Name() As String 3) Property IsNiceCustomer() As Boolean 4) ReadOnly Property AddressFullText() As String I don't know how to map the interface ICustomer, to the database. I get an error like this in the inner exception. "An association refers to an unmapped class: ICustomer" I'm using Fluent and NHibernate. Any help would be greatly appreciated. Thanks in advance.

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• How to copy a subset from an array of strings to an array of ints using Groovy?

  - by Cuga

  I have a String array in a Groovy class (args to a main method): String[] args I'd like to convert the 3rd to the last element into a new array of ints. Is there an easier way to do this in Groovy other than: final int numInts = args.length - 2 final int [] intArray = new int[numInts] for (int i = 2; i < args.length; i++) { intArray[i-2]=Integer.parseInt(args[i]) } I wanted to do: final int numInts = args.length - 2 final int [] intArray = new int[numInts] System.arraycopy(args, 2, intArray, 0, numInts) But it throws a class cast exception. Thanks!

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• What are the different methods for injecting cross-cutting concerns?

  - by Stacy Vicknair

  What are the different methods for injecting cross-cutting concerns into a class so that I can minimize the coupling of the classes involved while keeping the code testable (TDD or otherwise)? For example, consider if I have a class that requires both logging functionality and centralized exception management. Should I use DIP and inject both required concerns via an interface into the class that requires them? Should I use a service locater that I pass to each class that will require some cross cutting functionality? Is there a different solution altogether? Am I asking the wrong question entirely?

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• In query in Entity Frame work

  - by Syed Salman Raza Zaidi

  I am working on Entity frame work, i have created a method which is returning List of my Table, I am retrieving data on base of grpID(which is foreign key, so i can have multiple records) I have saved these grpID's in an array so I want to run IN command on Entity framework so that i can get records in single List, How can i apply In command,my code is below public List<tblResource> GetResources(long[] grpid) { try { return dataContext.tblResource.Where(c => c.GroupId == grpid && c.IsActive == true).ToList();//This code is not working as i am having array of groupIds } catch (Exception ex) { return ex; } }

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• Need some explanation about MS Ajax using PageMethods

  - by Ahmed Said

  I have a project that uses PageMethods to call functions on the server. The server functions (written in C#) return the values as array of strings, without doing any kind of serialization and in the client side (from Js) the accessing of the return values is by using static variable called arguments. I found that sometimes for some users (cases are not repro) sometimes an exception occured "WebServiceFailedException the server method 'Foo' returned invalid data. the 'd' property is missing from JSON." Some searching on google I found that people are serializing the return values using DataContractJsonSerializer class and in js accessing the return value using one of the callback function Example: function OnRequestComplete(result, userContext, methodName) { var Person = eval('(' + result + ')'); alert(Person.Forename); alert(Person.Surname); } So is the first technique is correct? or what?

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• Correct way to add objects to an ArrayList

  - by ninjasense

  I am trying to add an object to an arraylist but when I view the results of the array list, it keeps adding the same object over and over to the arraylist. I was wondering what the correct way to implement this would be. public static ArrayList<Person> parsePeople(String responseData) { ArrayList<Person> People = new ArrayList<Person>(); try { JSONArray jsonPeople = new JSONArray(responseData); if (!jsonPeople.isNull(0)) { for (int i = 0; i < jsonPeople.length(); i++) { Person.add(new Person(jsonPeople.getJSONObject(i))); } } } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (Exception e) { } return People; } I have double checked my JSONArray data and made sure they are not duplicates. It seems to keep adding the first object over and over.

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• isReachable in Java doesn't appear to be working quite the way it's supposed to

  - by Rayne

  I'm using Clojure, but I can read Java, so this isn't a Clojure specific question. This doesn't even seem to be working from Java. I'm trying to implement a bit of a 'ping' function using isReachable. The code I'm using is this: (.isReachable (java.net.InetAddress/getByName "www.microsoft.com") 5000) Translated to Java by a good friend of mine: public class NetTest { public static void main (String[] args) throws Exception{ String host = "acidrayne.net"; InetAddress a = InetAddress.getByName(host); System.out.println(a.isReachable(10000)); } } Both of these return false. I suppose I must be doin' it wrong, but Google research is telling me differently. I'm confuzzled!

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• android detect is gyroscope available

  - by Tan Jit Ren

  How can I detect whether the android device has gyroscope? Currently I'm using the following method to detect whether gyroscope is available. If gyroscope not available, then use accelerometer. SensorManager mgr = (SensorManager) getSystemService(SENSOR_SERVICE); List<Sensor> sensors = mgr.getSensorList(Sensor.TYPE_ALL); for (Sensor sensor : sensors) { Log.i("sensors",sensor.getName()); if(sensor.getName().contains("Gyroscope")){ try{ mSensorManager.registerListener(this, mSensorManager.getDefaultSensor(Sensor.TYPE_ROTATION_VECTOR), SensorManager.SENSOR_DELAY_FASTEST); return; }catch(Exception e){ } } } mSensorManager.registerListener(this, mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_FASTEST); However some of my app users complaint they can't use gyroscope. Is there any problem with the code?

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• NoClassDefFoundError when running java tool under Xcode

  - by pancake

  Hi all, I'm trying to create a Java Tool by using Xcode. I've already changed my build.xml to have Xcode target java 1.6 and not 1.3 so I can use generics. I'm getting no build errors and using 'javac' and 'java' in the terminal works. Now I want it to work in Xcode as well. I keep getting the following error: Exception in thread "main" java.lang.NoClassDefFoundError: MyClass where 'MyClass' is the class containing the main method. It probably has something to do with the classpath, which as the build.xml prescribes is "${bin}". There is a bin folder in my project folder, and it contains all the .class files needed to run the program. If anybody could help me, it'd be great!

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• Refactoring a long method that simply populates

  - by Jeune

  I am refactoring a method which is over 500 lines (don't ask me why) The method basically queries a list of maps from the database and for each map in the list does some computation and adds the value of that computation to the map. There are however too many computations and puts being done that the code has reached over 500 lines already! Here's a sample preview: public List<Hashmap> getProductData(...) { List<Hashmap> products = productsDao.getProductData(...); for (Product product: products) { product.put("Volume",new BigDecimanl(product.get("Height")* product.get("Width")*product.get("Length")); if (some condition here) { //20 lines worth of product.put(..,..) } else { //20 lines worth of product.put(..,..) } //3 more if-else statements like the one above try { product.put(..,..) } catch (Exception e) { product.put("",..) } //over 8 more try-catches of the form above } Any ideas on how to go about refactoring this?

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• Twitter search c#

  - by Lily

  Hi, I have implemented a method which manually scrapes the Search Twitter page and gets the tweets on different pages. But since there is a fast refresh rate, the method triggers an exception. Therefore I have decided to use TweetSharp API instead var search = FluentTwitter.CreateRequest() .AuthenticateAs(TWITTER_USERNAME, TWITTER_PASSWORD) .Users().SearchFor("dumbledore"); var result = search.Request(); var users = result.AsUsers(); this code was on the site. Does anyone know how I can avoid giving my credentials and retrieve from all users and not just the ones I have as friends? Thanks!

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• Couldn't run loadjava on user schema to load dbwsclientws.jar dbwsclientdb102.jar

  - by padmaja

  I am trying to load oracle webservice client jars to my schema. I did set the PATH to inlcude: /u01/app/oracle/product/10.2.0/db_1/bin When I try to run loadjava as "loadjava -u myschema/myscehmapwd -r -v -f -genmissing dbwsclientws.jar dbwsclientdb102.jar" I am getting error: Exception in thread "main" java.lang.NoClassDefFoundError: oracle/aurora/server/tools/loadjava/LoadJavaMain. Does it mean that jvm is not setup on the box? How can I check if the jvm is enabled or not? I am running it on Oracle 10g in UNIX environment. Any help with the issue is greatly appreciated.

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• Map Reduce job on Amazon: argument for custom jar

  - by zero51

  Hi all, This is one of my first try with Map Reduce on AWS in its Management Console. Hi have uploaded on AWS S3 my runnable jar developed on Hadoop 0.18, and it works on my local machine. As described on documentation, I have passed the S3 paths for input and output as argument of the jar: all right, but the problem is the third argument that is another path (as string) to a file that I need to load while the job is in execution. That file resides on S3 bucket too, but it seems that my jar doesn't recognize the path and I got a FileNotFound Exception while it tries to load it. That is strange because this is a path exactly like the other two... Anyone have any idea? Thank you Luca

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