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  • Ruby on Rails : How can i display data for the current view from a different table

    - by krishkule
    This might be a easy-to-answer question, but its a pain in the bum for me.... So... I have two tables - Chords - |id|chord|name|rating|artist_id| Artists - |id|artist| (the relations : chords : belongs_to :artist artists : has_many :chords ) And in the index page for "chords" i want to display chord,name,rating from Chords table AND artist from the Artists table this is the code for the chrod's index.html.erb : <table border="1"> <%@chords.each do |chord|%> <tr> <td><%=chord.artist.artist%></td> <td><%= link_to chord.name, chord %></td> <td><%=chord.rating%></td> <td><%= chord.created_at %></td> </tr> <%end%> </table> The error message is : undefined method `artist' for nil:NilClass Actually, at first it worked, but when i started to create the "new.html.erb" page and the create,new controllers, it stopped working - thats why this is so confusing for me! I will be glad to hear any critique and suggestions! Thank you

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  • Placeholder containing dynamic table is empty unless I create table twice

    - by Mike O.
    I am dynamically creating a table that contains a textbox in each cell. The table is put in a placeholder control. Everything displays perfectly. The problem is when I go to retrieve the values entered in the cells. I have the code to generate the table in a separate method called CreateTable(). In order for my program to find a table in the placeholder when I go to save, I have to run CreateTable() in a postback event AND in the PageLoad event. If I call CreateTable() in only one of those places and I try to save, it says the placeholder is empty and, therefore, I cannot save the textbox contents. I've tried calling CreateTable() from InitLoad but that doesn't work because it needs to reference values from three static controls: 1 dropdown, 1 listbox, and 1 calendar control, which I don't believe have had their viewstate rendered yet. Anyone have any ideas? It would sure be nice not to have to double the number of database calls just to make this work.

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  • SQL - table alias scope.

    - by Support - multilanguage SO
    I've just learned ( yesterday ) to use "exists" instead of "in". BAD select * from table where nameid in ( select nameid from othertable where otherdesc = 'SomeDesc' ) GOOD select * from table t where exists ( select nameid from othertable o where t.nameid = o.nameid and otherdesc = 'SomeDesc' ) And I have some questions about this: 1) The explanation as I understood was: "The reason why this is better is because only the matching values will be returned instead of building a massive list of possible results". Does that mean that while the first subquery might return 900 results the second will return only 1 ( yes or no )? 2) In the past I have had the RDBMS complainin: "only the first 1000 rows might be retrieved", this second approach would solve that problem? 3) What is the scope of the alias in the second subquery?... does the alias only lives in the parenthesis? for example select * from table t where exists ( select nameid from othertable o where t.nameid = o.nameid and otherdesc = 'SomeDesc' ) AND select nameid from othertable o where t.nameid = o.nameid and otherdesc = 'SomeOtherDesc' ) That is, if I use the same alias ( o for table othertable ) In the second "exist" will it present any problem with the first exists? or are they totally independent? Is this something Oracle only related or it is valid for most RDBMS? Thanks a lot

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  • How to show controls hierarchy in Winform designer

    - by Cédric V
    Hi, One of our client has an old winform application that contains forms with a lot of controls on them. Some of those controls have a deep hierarchy and that make it to hard to select them in the designer. I would need to understand this hierarchy to make modification and correct some bugs, is there a tools, plugin or something to be able to clearly see this hierarchy ? Something like in the aspx source when you have a breadcrumb of where you are in the HTML hierarchy (HTML Body div etc ...) or something more visual maybe ? Any ideas ? PS : we use Visual Studio 2008, .NET 2.0

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  • Altering sql tables based on condition

    - by Parker
    Is there any possible way to add a row of data to only some of the tables in a database? I am not sure what parameter I could use amongst the tables to compare them to each other. Any Ideas? For Example: My database has tables that are (let's say) group A tables, and tables that are group B. I want to add a row to only the group B tables while leaving the group A tables untouched. Sorry I should have been a bit more specific. The tables that need to have a row added will change. My application monitors inventory in different store locations(each table in my database represents a store). When I need to add an item to inventory(the items are rows in the tables) I don't want to have to manually add the row to all the store tables. My problem is: Not all the tables in the database represent stores. For instance one table stores the user login data. Obviously I do not want to add the new row to this table. How do I update only the tables that represent stores?

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  • How do I execute a sql statement through a variable (dyname sql) that tries to do an insert into a variable table?

    - by Testifier
    If I do what I wanna do with a TEMPORARY TABLE, it works fine: DECLARE @CTRFR VARCHAR(MAX) SET @CTRFR = 'select blah blah blah' -- <-- very long select statement. this returns a 0 or some greater number. Please note! --> I NEED THIS NUMBER. IF EXISTS ( SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo][#CTRFRResult]') AND type IN ( N'U' ) ) DROP TABLE [dbo].[#CTRFRResult] CREATE TABLE #CTRFRResult ( CTRFRResult VARCHAR(MAX) ) SET @CTRFR = 'insert into #CTRFRResult ' + @CTRFR EXEC(@CTRFR) The above works fine. The problem is that several databases are using the same TEMP table. Therefore I need to use a VARIABLE table (instead of a temporary table). What I have below is not working because it says that the table must be declared. DECLARE @CTRFRResult TABLE ( CTRFRResult VARCHAR(MAX) ) SET @CTRFR = 'insert into @CTRFRResult ' + @CTRFR -- I think the issue is here. EXEC(@CTRFR) Setting @CTRFR to 'insert into...' is not working because I'm assuming the table name is out of scope. How would I go about mimicking the temporary table code using a variable table?

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  • PHP while loop, table row

    - by Elliott
    Hi, I'm trying to loop through a database and output data into a div, if there are 3 divs horizontally accross it will the start a new tr until it reaches another 3 etc. It is currently outputted like : [] [] [] [] [] [] Currently I have it working when it reaches 3 it starts a new row, but I don't know how I can only echo a new tr once? As it creates a new table row each time. echo '<table><tr>'; while ($result) { $i ++; if ($i&3) { echo '<td> <div>Row Data</div> </td>'; } else { echo '<tr> <td> <div>Row Data</div> </td></tr>'; } } echo '</tr></table>'; The $result variable is the recordset from my sql query, everything works fine I just don't know how to only create a new table row once? Thanks

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  • Using data.table to aggregate

    - by dayne
    After multiple suggestions from SO users, I am finally trying to convert my code over to using data.tables. library(data.table) DT <- data.table(plate = paste0("plate",rep(1:2,each=5)), id = rep(c("CTRL","CTRL","ID1","ID2","ID3"),2), val = 1:10) > DT plate id val 1: plate1 CTRL 1 2: plate1 CTRL 2 3: plate1 ID1 3 4: plate1 ID2 4 5: plate1 ID3 5 6: plate2 CTRL 6 7: plate2 CTRL 7 8: plate2 ID1 8 9: plate2 ID2 9 10: plate2 ID3 10 What I would like to do is take the average of DT[,val] by plate when the id is "CTRL". I would normally aggregate the data frame, then use match to map the values back to a new column, 'ctrl'. Using the data.table package I can get: DT[id=="CTRL",ctrl:=mean(val),by=plate] > DT plate id val ctrl 1: plate1 CTRL 1 1.5 2: plate1 CTRL 2 1.5 3: plate1 ID1 3 NA 4: plate1 ID2 4 NA 5: plate1 ID3 5 NA 6: plate2 CTRL 6 6.5 7: plate2 CTRL 7 6.5 8: plate2 ID1 8 NA 9: plate2 ID2 9 NA 10: plate2 ID3 10 NA What I need is really: DT <- data.table(plate = paste0("plate",rep(1:2,each=5)), id = rep(c("CTRL","CTRL","ID1","ID2","ID3"),2), val = 1:10, ctrl = rep(c(1.5,6.5),each=5)) > DT plate id val ctrl 1: plate1 CTRL 1 1.5 2: plate1 CTRL 2 1.5 3: plate1 ID1 3 1.5 4: plate1 ID2 4 1.5 5: plate1 ID3 5 1.5 6: plate2 CTRL 6 6.5 7: plate2 CTRL 7 6.5 8: plate2 ID1 8 6.5 9: plate2 ID2 9 6.5 10: plate2 ID3 10 6.5 Eventually I would like to use much more complicated selections of the values, but I do not know how to select specific values, run some function, then map those values back to the appropriate row using data frames.

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  • 5 tipologie di consumatori con cui confrontarsi per rendere vincenti le proprie strategie di CRM

    - by antonella.buonagurio(at)oracle.com
    Sono 5 le tipologie di consumatori che  rappresentano 5 differenti modalità di acquisto di cui le aziende devono tenere in considerazione nella pianificazione dei propri piani strategici del 2011. Oltre al "consumatore just-in-time", già citato in un precedente articolo apparso sul Wall Street Journal a Novembre ecco le altre tipologie evidenziate da Lioe Arussy (Strativity Group). Il consumatore alla ricerca degli sconti Il consumatore diffidente Il consumatore timoroso Il consumatore fai-da-te Il consumatore indulgente Per ognuno di queste categorie viene evidenziato il modello di comportamento e il conseguente modello di acquisto. Per saperne di più  

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  • 5 tipologie di consumatori con cui confrontarsi per rendere vincenti le proprie strategie di CRM

    - by antonella.buonagurio(at)oracle.com
    Sono 5 le tipologie di consumatori che  rappresentano 5 differenti modalità di acquisto di cui le aziende devono tenere in considerazione nella pianificazione dei propri piani strategici del 2011. Oltre al "consumatore just-in-time", già citato in un precedente articolo apparso sul Wall Street Journal a Novembre ecco le altre tipologie evidenziate da Lioe Arussy (Strativity Group). Il consumatore alla ricerca degli sconti Il consumatore diffidente Il consumatore timoroso Il consumatore fai-da-te Il consumatore indulgente Per ognuno di queste categorie viene evidenziato il modello di comportamento e il conseguente modello di acquisto. Per saperne di più 

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  • SQL SERVER – How to an Add Identity Column to Table in SQL Server

    - by Pinal Dave
    Here is the question I received on SQLAuthority Fan Page. “How do I add an identity column to Table in SQL Server? “ Sometime the questions are very very simple but the answer is not easy to find. Scenario 1: If you are table does not have identity column, you can simply add the identity column by executing following script: ALTER TABLE MyTable ADD ID INT IDENTITY(1,1) NOT NULL Scenario 2: If your table already has a column which you want to convert to identity column, you can’t do that directly. There is a workaround for the same which I have discussed in depth over the article Add or Remove Identity Property on Column. Scenario 3: If your table has already identity column and you can want to add another identity column for any reason – that is not possible. A table can have only one identity column. If you try to have multiple identity column your table, it will give following error. Msg 2744, Level 16, State 2, Line 2 Multiple identity columns specified for table ‘MyTable‘. Only one identity column per table is allowed. Leave a comment if you have any suggestion. Reference : Pinal Dave (http://blog.SQLAuthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL Tagged: Identity

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  • Printing multiple pages per sheet doesn't work

    - by Ricky Robinson
    In Ubuntu 12.04, I added a network printer which I had previously used without any problems on a different machine (with the same release of Ubuntu). Now, with the default generic driver installed, printing multiple pages per sheet from evince doesn't work properly. If I select 2 per sheet, be it long or short edge, it always prints 4. Why is this? It used to happen with non-pdf documents in the past, like from a browser. My workaround was to print to pdf file and then print the pdf itself. Now I'm clueless... Edit: the same happens with a different network printer, in which I installed the driver specific to its particular model.

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  • Will Traffic exchange programs work in Pay per impression ad campaigns

    - by vinoth
    I'm having a technology blog with nearly 3000 visitors a day (1000 - 1300 unique visitors). I'm generating visitors through traffic exchange programs like hitleap.com, addmefast.com. Now i'm planning to go with some pay per impression programs. So far i came to know that google adsense won't allow using traffic exchange programs. Did all pay-per-impression programs will follow the same ? will i get banned using traffic exchange programs? Please reply me your suggestions, Thanks in advance. Sorry for my bad English.

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  • Per fragment lighting with OpenGL 4.x tessellated model

    - by Finlaybob
    I'm experienced with OpenGL 3+. I'm dabbling with tessellation shaders and have now got to a point where I have a nicely tessellated teapot/plane demo (quick look here) As can be seen from the screenshots, the lighting is broken (though admittedly doesn't look too bad in the image) I've tried to add a normal map to the equation but it still doesn't come out right, I can calculate the normals, tangents and binormals per triangle in the geometry shader but still looks wrong. I think the question would be; How do I add per fragment lighting to a tessellated model? The teapot is 32 16-point patches, the plane is one single 16 point patch. The shaders are here, but they are a complete mess, so I don't blame anyone who cant make sense of them. But peruse at your leisure if you like. Also, if this question is more suited to be somewhere else i.e. Stack Overflow or the Programming stack please let me know.

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  • Hibernate: Parent/Child relationship in a single-table

    - by Dee
    I hardly see any pointer on the following problem related to Hibernate. This pertains to implementing inheritance using a single database table with a parent-child relationship to itself. For example: CREATE TABLE Employee ( empId BIGINT NOT NULL AUTO_INCREMENT, empName VARCHAR(100) NOT NULL, managerId BIGINT, CONSTRAINT pk_employee PRIMARY KEY (empId) ) Here, the managerId column may be null, or may point to another row of the Employee table. Business rule requires the Employee to know about all his reportees and for him to know about his/her manager. The business rules also allow rows to have null managerId (the CEO of the organisation doesn't have a manager). How do we map this relationship in Hibernate, standard many-to-one relationship doesn't work here? Example code would be appreciated.

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  • Hibernate: Parent/Child relationship in a single-table

    - by Dee
    I hardly see any pointer on the following problem related to Hibernate. This pertains to implementing inheritance using a single database table with a parent-child relationship to itself. For example: CREATE TABLE Employee ( empId BIGINT NOT NULL AUTO_INCREMENT, empName VARCHAR(100) NOT NULL, managerId BIGINT, CONSTRAINT pk_employee PRIMARY KEY (empId) ) Here, the managerId column may be null, or may point to another row of the Employee table. Business rule requires the Employee to know about all his reportees and for him to know about his/her manager. The business rules also allow rows to have null managerId (the CEO of the organisation doesn't have a manager). How do we map this relationship in Hibernate, standard many-to-one relationship doesn't work here? Example code would be appreciated.

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  • Gap after table in LaTex

    - by Tim
    Hi, I notice that there is some gap after my table. See the following snapshot: http://i42.tinypic.com/23rkdn6.jpg My Latex code is: \begin{table}[htb] \caption{Error rates VS training size in AdaBoosted stump, SVM and kNN. \label{tab:examplecount8000errerrplot}} \begin{center} \begin{tabular}{c c} \includegraphics[scale=0.4]{../boost.eps} & \includegraphics[scale=0.4]{../svm.eps} \\ \includegraphics[scale=0.4]{../knn.eps} & \\ \end{tabular} \end{center} \end{table} % \subsection{Feature Numbers} Is the gap normal or How can I reduce the gap to be normal? Thanks and regards!

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  • MySQL: Can the table comment length be increased?

    - by Victor Kimura
    I read the MySQL comment length questions on StackOverflow here: http://stackoverflow.com/questions/391323/table-comment-length-in-mysql http://stackoverflow.com/questions/2473934/how-to-increase-mysql-table-comments-length The first link suggests that it can be done and the second suggests it cannot. I don't know why there is this limitation as the comments are very useful. Imagine if there was a limit of 60 characters for your programs. I wrote about this on my site and have some snapshots to the phpMyAdmin and Dbforge MySQL IDEs: http://mysql.tutorialref.com/mysql-table-comment-length-limit.html Is there a way to change this in phpMyAdmin or perhaps even on the CLI? There is a bug commit report from MySQL on this particular problem (follow the first StackOverflow link). It seems to state that the length problem is fixed. I have MySQL 5.1.42. Thank you, Victor

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  • How to create following Pivot table ?

    - by Vamshi
    Hi! Can we create pivot table with Multiple columns and each column contains multiple rows. For example........... Database Table: BatchID BatchName Chemical Value -------------------------------------------------------- BI-1 BN-1 CH-1 1 BI-2 BN-2 CH-2 2 -------------------------------------------------------- This is the table , i need to display like below in Excel Sheet BI-1 BI-2 BN-1 BN-2 ------------------------------------------ CH-1 1 null ------------------------------------------ CH-2 null 2 ------------------------------------------ Here BI-1,BN-1 are two rows in a single columns i need to display chemical value as row of that. Could Please help me to solve this problem. Thank You.

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  • How to stretch a table over multiple pages.

    - by lexu
    I have a Table (multiple rows, multiple columns, see below ) that is longer than one page. How can I tell LaTeX to continue on the next page. Adding a \newpage didn't work Manualy 'ending' and 'reopening' the table works, but is very tedious, since the table will be many pages long. \begin{tabular}{lp{13cm}} AAAAAAAAAA & FOOBAR FOOBAR FOOBAR FOOBAR FOOBAR\ BBBBBBBBBB & FOOBAR FOOBAR FOOBAR FOOBAR FOOBAR\ CCCCCCCCCC & FOOBAR FOOBAR FOOBAR FOOBAR FOOBAR\ ... ZZZZZZZZZ & FOOBAR FOOBAR FOOBAR FOOBAR FOOBAR\\ \end{tabular}

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  • Hibernate error: cannot resolve table

    - by Roman
    I'm trying to make work the example from hibernate reference. I've got simple table Pupil with id, name and age fields. I've created correct (as I think) java-class for it according to all java-beans rules. I've created configuration file - hibernate.cfg.xml, just like in the example from reference. I've created hibernate mapping for one class Pupil, and here is the error occured. <hibernate-mapping> <class name="Pupil" table="pupils"> ... </class> </hibernate-mapping> table="pupils" is red in my IDE and I see message "cannot resolve table pupils". I've also founded very strange note in reference which says that most users fail with the same problem trying to run the example. Ah.. I'm very angry with this example.. IMHO if authors know that there is such problem they should add some information about it. But, how should I fix it? I don't want to deal with Ant here and with other instruments used in example. I'm using MySql 5.0, but I think it doesn't matter. UPD: source code Pupil.java - my persistent class package domain; public class Pupil { private Integer id; private String name; private Integer age; protected Pupil () { } public Pupil (String name, int age) { this.age = age; this.name = name; } public Integer getId () { return id; } public void setId (Integer id) { this.id = id; } public String getName () { return name; } public void setName (String name) { this.name = name; } public Integer getAge () { return age; } public void setAge (Integer age) { this.age = age; } public String toString () { return "Pupil [ name = " + name + ", age = " + age + " ]"; } } Pupil.hbm.xml is mapping for this class <?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping package="domain" > <class name="Pupil" table="pupils"> <id name="id"> <generator class="native" /> </id> <property name="name" not-null="true"/> <property name="age"/> </class> </hibernate-mapping> hibernate.cfg.xml - configuration for hibernate <hibernate-configuration> <session-factory> <!-- Database connection settings --> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <property name="connection.url">jdbc:mysql://localhost/hbm_test</property> <property name="connection.username">root</property> <property name="connection.password">root</property> <property name="connection.pool_size">1</property> <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property> <property name="current_session_context_class">thread</property> <property name="show_sql">true</property> <mapping resource="domain/Pupil.hbm.xml"/> </session-factory> </hibernate-configuration> HibernateUtils.java package utils; import org.hibernate.SessionFactory; import org.hibernate.HibernateException; import org.hibernate.cfg.Configuration; public class HibernateUtils { private static final SessionFactory sessionFactory; static { try { sessionFactory = new Configuration ().configure ().buildSessionFactory (); } catch (HibernateException he) { System.err.println (he); throw new ExceptionInInitializerError (he); } } public static SessionFactory getSessionFactory () { return sessionFactory; } } Runner.java - class for testing hibernate import org.hibernate.Session; import java.util.*; import utils.HibernateUtils; import domain.Pupil; public class Runner { public static void main (String[] args) { Session s = HibernateUtils.getSessionFactory ().getCurrentSession (); s.beginTransaction (); List pups = s.createQuery ("from Pupil").list (); for (Object obj : pups) { System.out.println (obj); } s.getTransaction ().commit (); HibernateUtils.getSessionFactory ().close (); } } My libs: antlr-2.7.6.jar, asm.jar, asm-attrs.jar, cglib-2.1.3.jar, commons-collections-2.1.1.jar, commons-logging-1.0.4.jar, dom4j-1.6.1.jar, hibernate3.jar, jta.jar, log4j-1.2.11.jar, mysql-connector-java-5.1.7-bin.jar Compile error: cannot resolve table pupils

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  • Use XSLT to arrange a list of items in a table

    - by Mark Sp
    I have a linear list of items which I wish to arrange in a table using XSLT. I wish to specify the number of columns as a parameter. For example, if I have a list of 12 items, I can select a 2x6, 3x4, 4x3 or 6x2 table. I cannot see a general way to do this. I have seen this article: http://www.nedcomp.nl/support/origdocs/xml4/extracted/xpath_hdi_1_4llx.aspx It tells you how to generate a table with a specific number of columns, but does not allow a general case. (Ideally there would be a loop for the xsl:value-of lines). Thanks Mark

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