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• Database Optimization techniques for amateurs.

  - by Zombies

  Can we get a list of basic optimization techniques going (anything from modeling to querying, creating indexes, views to query optimization). It would be nice to have a list of these, one technique per answer. As a hobbyist I would find this to be very useful, thanks. And for the sake of not being too vague, let's say we are using a maintstream DB such as MySQL or Oracle, and that the DB will contain 500,000-1m or so records across ~10 tables, some with foreign key contraints, all using the most typical storage engines (eg: InnoDB for MySQL). And of course, the basics such as PKs are defined as well as FK contraints.

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• JPA: Database Generated columns

  - by jpanewbie

  Hello, I am facing an issue with Hiebrnate and JPA. My requirement is column CreatedDTTM and LastUPDATEDDTTM should be populated at the DB level. I have tried following but no use. My columns are set NOT NULL. I get a "cannot insert Null into LastUpdatedDttm" exception. Any guidance is appreciated. @Column(name="LAST_UPDATED_DTTM", insertable=false, updatable=false, columnDefinition="Date default SYSDATE") @org.hibernate.annotations.Generated(value=GenerationTime.INSERT) @Temporal(javax.persistence.TemporalType.DATE) private Date lastUpdDTTM; @Column(name="CREATED_DTTM”, insertable=false, updatable=false) @org.hibernate.annotations.Generated(value=GenerationTime.ALWAYS) @Temporal(javax.persistence.TemporalType.DATE) private Date createdDTTM;

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• Database design

  - by Hadad

  Hello, I've a system, that have two types of users (Companies and individuals).all types have a shared set of properties but they differ in another. What is the best design merge all in one table that allows null for unmatched properties, or separate them in two tables related to a basic table with a one to one relationship. Thanks.

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• Django call function when an object gets added

  - by dotty

  Hay, i have a simple model class Manufacturer(models.Model): name = models.CharField() car_count = models.IntegerField() class Car(models.Model): maker = ForeignKey(Manufacturer) I want to update the car_count field when a car is added to a manufacturer, I'm aware i could just count the Manufacturer.car_set() to get the value, but i want the value to be stored within that car_count field. How would i do this? EDIT Would something like this work? def save(self): if self.id: car_count = self.car_set.count() self.save()

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• Tie destruction of an object (sealed) to destruction of an unmanaged buffer

  - by testtestSO

  I'll explain my situation first: I'm interested of using the Bitmap constructor that takes scan0, stride and format, because I'm decoding tiled images and I'd like to choose my own stride so I can decode the tiles without caring about the bounds in the decoder part. Anyway, the problem is that the documentation says: The caller is responsible for allocating and freeing the block of memory specified by the scan0 parameter. However, the memory should not be released until the related Bitmap is released. I can't release the buffer easily, because the Bitmap is then passed to another class that will eventually destroy it and I don't have control over it. Is there some way (hacky, I know) to tell the GC to also release my buffer when the Bitmap is destroyed? (Also, any alternative solution is welcome).

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• How to get if the object is already retrieved in inject

  - by zerkms

  Is it possible to know that particular dependency already has been satisfied by ninject kernel? To be clear: Let's suppose we have this module: Bind<IA>().To<A>(); Bind<IB>().To<B>(); And some "client"-code: var a = kernel.Get<IA>(); // how to get here "true" for assumption: "IA was requested (once)" // and "false" for: "IB was not requested ever"

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• Selecting a random result from Simple Database (SDB) on AWS

  - by benr

  Anyone know how to do this - just what would be the equivalent to this: "select * from YOUR_TABLE order by rand() limit 1" in mysql?? Maybe not possible in SDB?

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• jquery is getting the old values from database

  - by sansknwoledge

  hi in my jsp page i am a having a jquery area which pass the values to a servlet which returns an output of dropdownlist . then the jsp file do some updation so certain values which are in the dropdownlist should not be there while repopulating. but it is not happening. my jquery code is $("#cbocode").change(function(){ var cdid=$("#cbocode option:selected"); $.get("trnDC?caseNo=20&cdid="+cdid.text(),function(data){ $("#divinstrument").html(data); }) and the servlet code is case 20:{ //jquery call String cdid=(String) request.getParameter("cdid"); Statement st = con.createStatement(); ResultSet rs = st.executeQuery("select instrumentid from mstinstrument where codeid='" + cdid + "' and rec_Status='A' and statusid='U' and Agentid='METLAB'"); if (!rs.wasNull()){ //List data=new ArrayList(); String v="<select id=cboinstr>"; while (rs.next()) { // data.add(rs.getString("vend_code")); v += "<option>" + rs.getString("instrumentid").toString() + "</option>"; } v+="</select>"; response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.print(v); } else{ response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.print("no data found"); } where i am missing???

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• Select where a value present

  - by Roy

  First a database example: id, product_id, cat, name, value -------------------------------- 1,1,Algemeen,Processor,2 Ghz 2,1,Algemeen,Geheugen,4 GB 3,2,Algemeen,Processor,3 Ghz 4,2,Algemeen,Geheugen,4 GB 5,3,Beeldscherm,Inch,22" 6,3,Beeldscherm,Kleur,Zwart 7,3,Algemeen,Geheugen,3 GB 8,3,Algemeen,Processor,3 Ghz I want with one query to select the follow id's: 1,2,3,4,7,8 Because the cat = algemeen and the name = processor by these products. ID 5,6 are only present by product 3. So, the entry's (cat and name) which are present by all products (product_id) have to be selected. The database contains 80.000 entry's with a lot of diffrent cat's, name's and value's. Is this possible with one query or is some php necessary? How do I do this? My apologies for the bad English.

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• Desgining a database with flexible user profile

  - by Mughrabi

  Hi, Am working on a design where I can have flexible attributes for a user & am confused how to continue the design of the schema. I made a table where I kept system needed information called users id username password Now, I wish to create a profile table and have one to one relation where all the other attributes in profile table such as email, first name, last name..etc. My question is, is there a way to add a third table in which even profile will be flexible if my clients need to create a new attribute he/she won't need any customization to the code? Regards,

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• How to query a collection of inherited object for a particular object type in grails ?

  - by quilovnic

  Hi, I have a this model : class Question{ Set components static hasMany = [components: QuestionComponent] } class QuestionComponent{ static belongsTo = Question } class QuestionComponentStatus extends QuestionComponent{ } class QuestionComponentOther extends QuestionComponent{ } I want to get only QuestionComponentStatus from Set components : questionInstance.components. ? Thanks a lot

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• how store date in myqsl database?

  - by Syom

  i have date in dd/mm/yyyy format. how can i store it in databse, if i fant to do some operations on them after? for example i must find out the rows, where date > something what type i must set to date field? thanks

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• Join data from two Lists into one object

  - by Petr Mensik

  I ran into following situation and I am wondering about best solution. Let's say I have List<Object1> and List<Object2>, these lists are result of two separated queries. Both of them have the same size and there is relationship 1:1 between elements in the lists based on ID. I know that best solution would be fetching data in one DB query but that's possible right now. So my question is, what is the best way to join these lists into let's say List<Object3>?

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• Finding object count where a field is unique in Django

  - by Johnd

  I have a model that is something like this: class Input(models.Model): details = models.CharField(max_length=1000) user = models.ForeignKey(User) class Case(Input): title = models.CharField(max_length=200) views = models.IntegerField() class Argument(Input): case = models.ForeignKey(Case) side = models.BooleanField() A user can submit many arguments, per case. I want to be able to say how many users have submitted side=true arguments. I mean if 1 user had 10 arguments and another user had 2 arguments (both side=true) I'd want the count to be 2, not 12.

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• what is the optimal database connection strategy

  - by ooo

  i have a asp.net mvc website which runs a number of queries for each page. Should i open up a single connection or open and close a connection on each query?

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• Unicode format saving to database

  - by sandeep

  I want to write an windows application in c#.net in which I have to save hindi language fonts to the databases and reading them straight away.I have searched lots of websites and read about localization but couldn't make it through.Please help me. Thanks

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• Problem connecting to remote mysql database

  - by user361024

  I am trying to connect to a mysql db on a shared server. I am using a java application to make the connection. Problem doesn't happen when I connect to localhost db. URL = "jdbc:mysql://SHARED HOST IP:3306/DBNAME"; USER = "dbUSER"; PASS = "dbPASS"; Connection conn = DriverManager.getConnection(URL, USER, PASS); java.sql.SQLException: Access denied for user 'DBUSER'@'mycomputersIP???' (using password: YES) It is strange that it says denied for dbuser@ mycomputersip instead of dbuser@sharedhostIP Is there a setting on my wireless router that is screwing things up?

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• Keeping object in memory (iPhone SDK)

  - by Chris

  I am trying to create a UIImageView called theImageView in the touchesBegan method that I can then then move to a new location in touchesMoved. Currently I am receiving an "undeclared" error in touchesMoved where I set the new location for theImageView. What can I do to keep theImageView in memory between these two methods? - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { ... UIImageView *theImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"image.png"]]; theImageView.frame = CGRectMake(263, 228, 193, 300); [theImageView retain]; ... } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { ... theImageView.frame = CGRectMake(300, 300, 193, 300); ... }

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• Disallow taking pointer/reference to const to a temporary object in C++ (no C++0X)

  - by KRao

  Hi, I am faced with the following issue. Consider the following class: //Will be similar to bost::reference_wrapper template<class T> class Ref { public: explicit Ref(T& t) : m_ptr(&t) {} private: T* m_ptr; }; and this function returning a double double fun() {return 1.0;} If we now have double x = 1.0; const double xc = 1.0; Ref<double> ref1(x); //OK Ref<const double> refc1(cx); //OK good so far, however: //Ref<double> ref2( fun() ); //Fails as I want it to Ref<const double> refc2( fun() ); //Works but I would like it not to Is there a way to modify Ref (the way you prefer) but not the function fun, so that the last line returns a compile-time error? Please notice you can modify the constructor signature (as long as I am able to initialise the Ref as intended). Thank you in advance for your help!

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• ASP error 424 Object required

  - by jeff

  I've got a problem with the following code pasted below, the problem seems to be coming from the openastextstream this carries on from another question: Set str_text_stream = obj_file.OpenAsTextStream(ForReading, TristateUseDefault) response.Write "<table>" int_j = 0 int_x = 0 Err.number = 0 Do While Not str_text_stream.AtEndOfStream str_po_insert_sql = "INSERT into tbl_purchase_orders (purchase_order_number, purchase_order_vendor_number, purchase_order_vendor_name) " str_po_insert_sql = str_po_insert_sql & " VALUES (" str_line = str_text_stream.readline arr_line = Split(str_line, """,""", -1) if Ubound(arr_line) <> 2 then Response.write "<tr><td>The line " & str_line & " could not be imported.</td></tr>" int_x = 1 else int_y = Instr(arr_line(2), """,") - 1 str_field_0 = Replace(arr_line(0), """", "") str_field_0 = Replace(str_field_0, "'", "''") str_field_1 = Replace(arr_line(1), "'", "''") str_field_2 = Left(arr_line(2), int_y) str_field_2 = Replace(str_field_2, "'", "''") str_po_insert_sql = str_po_insert_sql & "'" & str_field_0 & "', '" & arr_line(1) & "', '" & str_field_2 & "')" rs_po_insert.Open str_po_insert_sql, dbConnection, 3 if Err.number <> 0 then Response.write "<tr><td>The line " & str_po_insert_sql & " was imported.</td></tr>" end if Err.number = 0 int_j = int_j + 1 end if loop data from test import: "4501366934","800002","Clancy Docwra Ltd",04/05/2010 00:00:00 "4501366935","800004","Clancy Docwra Ltd",04/05/2010 00:00:00 "4501366936","800004","Clancy Docwra Ltd",04/05/2010 00:00:00

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• An issue on object orientation in php

  - by rabidmachine9

  Hello people, I have come up to issues while I'm trying to write some classes, here is an example: I have this class called TwitterGrub and I cant call it like that: $c = new TwitterGrub(); $c->twitterDisplay(); here is the class itself: <?php class TwitterGrub{ function twitterCapture($user = 'username',$password = 'pass') { $ch = curl_init("https://twitter.com/statuses/user_timeline.xml"); curl_setopt($ch, CURLOPT_HEADER, 1); curl_setopt($ch,CURLOPT_TIMEOUT, 30); curl_setopt($ch,CURLOPT_USERPWD,$user . ":" . $password); curl_setopt($ch,CURLOPT_RETURNTRANSFER,1); curl_setopt ($ch, CURLOPT_SSL_VERIFYPEER, 0); curl_setopt ($ch, CURLOPT_SSL_VERIFYHOST, 0); $result=curl_exec ($ch); $data = strstr($result, '<?'); $xml = new SimpleXMLElement($data); return $xml; } function twitterDisplay($twitNum = 2){ $xml = $this::twitterCapture(); for($i= 0; $i<$twitNum; $i++){ echo "<div class= 'curvebox'>".$xml->status[$i]->text."</div>"; } } } ?> The problem is that everytime I want to change the username or password I have to jump back to class definition and that makes things not modular... and in many ways it feels wrong. So the question is what would be the proper way to chance my username and password through the objects interface and then call twitterDisplay() method with the new data?Hope that makes sense. Thanks in advance

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• Removing random object from parent CCprite

  - by Natty

  probably this is a simple problem to solve, since I'm quite new. I have a scene with a waiter holding a tray of food (the food is a random CCSprite choosen from an array) each time he comes onscreen he holds a new piece of food (the user touches the food and the waiter walks off to return again with a new piece of food however I cant seem to delete the old peice of food from the screen as it says the child is already added... any help would be great -(id) init { ///other code then... waiterOnSCreen = [CCSprite spriteWithSpriteFrameName:@"CatUP.png"]; waiterOnSCreen.position = ccp(CatOffSCreenPosX, catXpos); [self addChild:waiterOnSCreen z:0]; //moving the waiter // the random food sprite is added later to the waiter // [waiterOnSCreen addChild:myRandomSprite]; } -(void)LoadRandomFood { ///I make my array here then... int i = arc4random() % [RandomFood count]; myRandomSprite = (CCSprite *)[RandomFood objectAtIndex:i]; //waiterOnSCreen is a CCSprite added on the init [waiterOnSCreen addChild:myRandomSprite]; myRandomSprite.position=ccp(290,220); myRandomSprite.tag = RandomFoodTag; } } later in if(CGRectContainsPoint(waiterOnSCreen.boundingBox, location)) { //trying to remove the food here //Ive already tried to remove the sprite using [self removeChildByTag:RandomeObjectTag]; //and also CCSprite *wantedSprite = (CCSprite *)[self getChildByTag:RandomFoodTag]; [wantedSprite removeFromParentAndCleanup:YES]; } }

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• What is the best way to sync multiple client SqlServers to one MS SqlServer 2005?

  - by user605055

  I have several client databases that use my windows application. I want to send this data for online web site. The client databases and server database structure is different because we need to add client ID column to some tables in server data base. I use this way to sync databases; use another application and use C# bulk copy with transaction to sync databases. My server database sql server is too busy and parallel task cannot be run. I work on this solution: I use triggers after update, delete, insert to save changes in one table and create sql query to send a web service to sync data. But I must send all data first! Huge data set (bigger than 16mg) I think can't use replication because the structure and primary keys are different.

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• C++ Any way to store different templated object into the same container

  - by JP

  Is there any hack I could use to do this: template <class TYPE> class Hello { TYPE _var; }; I would like a way to store Hello<int> intHello and Hello<char*> charHello into the same Container such as a Queue / List.

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• Can i use a model object directly in a find

  - by user340100

  Hi, Can i pass a_teacher directly into the find? or do i have to compare each of its attributes as i have done here? thanks a_teacher = Techer.new(:name => "Bob", :age => 30) self.classes.all(:conditions => ["teacher.name = ? AND teacher.age = ?", a_teacher.name,a_teacher.age], :joins => :teacher)

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