Please explain the difference between the sql data

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• Please explain the guidelines related to the Platform.invokeLater and reuse of cell in tableview

  Hello

  1.

  Whenever I see tableview in JavaFX 2 + I see

  1. @Override   
  2. public Sub updateItem (last element of the string, Boolean void) { }
  3. Super .updateItem (element, empty);   
  4. if (item != null) {   
  5. button.setText (item);
  6. setGraphic (button);
  7. }  else { 
  8. (setGraphic)); /
  9. }
  10. }
  11. 
      

  
  

  So basically, this method is called for each item in my list. Now my questions:

  + where element can be null? I have a list < String > so I don't see the point of what's going on

  + Why does the (null) setGraphic else? Or more if the item is null then null graphics also.

  
  

  I understand that this code is related to the loading of data that you highlight and reuse the cells, but it is not clear to me how it works. Please explain a little bit what happens and what makes the super.update done too if possible.

  
  

  2.

  
  

  1. Platform.runLater (new Runnable() { })
  2. public void run() { 
  3. final Node scrollBar = comboBox.lookup (".scroll-bar: vertical '); 
  4. scrollBar.setOpacity (0,); 
  5. }
  6. });

  In the present code why can't then I just directly called search & 'SetOpacity?

  I suppose that if I call it directly then it will run right in this moment. But if I wrap in this executable, then it is added to a queue of javafx, which will process my application when it can then perhaps do not stress the UI? But I don't know, can you tell if it is correct or not I think?

  I think it's very important for all developers who start with FX to understand the purpose of the present code.

  Thank you

  Desmond

  (When you have two questions, please post two separate interviews. It makes it easier for people to seek and find the answer in the future).

  So basically, this method is called for each item in my list.

  No, actually.

  The cells are just for rendering in your list items. If you have a lot of articles (or even a lot), so some scrolls off the screen, TableCells will not be created for them. In addition, the user scrolls around, the cells that represent the items that scroll off the screen can be used for items that are now visible. The updateItem (...) method will be called to update the cell to display the new item in this case.

  If relatively few cells is created. On the other hand, the updateItem (...) method can be called in quite frequently in certain circumstances as the cells are re-used.

  + where element can be null? I have a list of , so I don't see the point of what's going on

  There are two possibilities:

  1. The cell is empty. Note that in a table with very few objects, the table is filled with empty lines. Those are always represented by cells, which have the empty flag set to true and the item the null value property.
  2. NULL is a valid value perfectly put in (some implementations of) list. Therefore, it is possible that you really have null values in your list. In addition, in a TableView property to the value of the column for a given row can be set to null.

  + Why does the (null) setGraphic else?

  If the cell contained a non-null value before and is updated to represent a null value, then you will need to remove the graphic. (Otherwise you may find yourself with buttons in the empty lines, which is probably not what you want.) This can happen if the lines are removed, or possibly during scrolling like cells are reused (the latter is possible, but it is difficult to see what happens to implementation). In trees, the cells can become empty as nodes in the tree are reduced.

  What makes the super.update makes

  The default TableCell performs a lot of work. He calls the behavior by default until your custom implementation is called. This default behavior includes up-to-date of the item and empty properties to new values, saving listeners of the mouse to the selection behavior and editing behavior if the cell is editable, etc..

  It is not clear to me how it works

  It's not really supposed to be. It is object oriented programming: you're supposed to only rely on the feature (which it does) rather than implementing (how it does). This frees up developers to JavaFX to vary the implementation (to improve performance, for example) from one version to the other, as they did quite significantly from 2.2 JavaFX JavaFX 8. All you know is that some cells are created, they can be reused, and the updateItem (...) method will be called whenever the modification of the element in a particular cell. Which may be because the property that the cell is the changed view, either because the cell was re-used for another element. The cells can become empty due to reuse. No guarantees are made as to how and when reuse will occur. (Make these guarantees would greatly limit the ability of the JavaFX team to change things in the future)

  In the present code why can't then I just directly called search & 'SetOpacity?

  It's not easy without a context, but I guess that this code is in a (...) Platform.runLater to ensure that the nodes were posted on the screen.

  The problem is that research based on css will not succeed usually until a render pass is filed, which is always after the step was established, but can not be immediately after. The Platform.runLater (...) here forces the code to execute after all what is currently pending on the Thread of the FX Application.

  12. Can someone please clarify the SQL Interface guide

      Therefore, the guide Interface SQL said for Linux there must be a softlink in the ESSBASEPATH/bin/.odbc.ini user directory
      
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      Please specify.

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      Concerning

      Celvin

      http://www.orahyplabs.com

      Please check the answers as useful/correct as appropriate

  13. Please explain the meaning of 'Deferred' in the JIRA bug database

      Dear Adobe team,

      I posted a few bugs recently and discovered this morning that they are now "closed" with a "Deferred" resolution

      Some of these bugs are

      https://bugs.Adobe.com/jira/browse/FB-26396

      https://bugs.Adobe.com/jira/browse/FB-26317

      https://bugs.Adobe.com/jira/browse/FB-26081

      Please explain how to understand this decision.

      My hypothesis is that the bugs remain open until they are solved in the next version.

      Why are these bugs closed or delayed?

      When the deferred bugs are reopened?

      Management will likely chime in here.

      Briefly, the bugs get carried over to the current version. They have reviewed again when planning continues for the next version.

      The only time wherever a bug/request is really dead is when it is marked as "retirement".

      Jason San Jose

      Software engineer, Flash Builder

  14. Please explain the difference

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  15. Generate the Sql Data model ER diagram

      Hello

      I want to use the Oracle Sql Developer Data Modeler to generate ER diagram for my schema. There are a lot of tables in this schema, so I would like to exclusively identify the tables that should be selected to generate my ER diagram.

      Basically, I want these table that are related to other tables here. The reason being, if I select all the tables in the schema, and then I went to these tables in the ER diagram which have nothing to do with other tables.

      Please can anyone suggest write queries that produce this data dictionary?

      Thank you.

      select uc1.constraint_name,
             uc1.table_name,
             uc1.constraint_type,
             uc2.constraint_name,
             uc2.table_name,
             uc2.constraint_type
      from   user_constraints uc1,
             user_constraints uc2
      where  uc1.constraint_type='R'
             and uc1.r_constraint_name=uc2.constraint_name
      

      This gives you the relationship between the primary and foreign key

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      Thanks a bunch!

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  17. effectiveness of the sql data warehouse and star/snowflake schema

      Hello

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      In addition to indexing, partitioning with star_transformation enabled etc I'm condisriing impact of the following on the performance of the queries.

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      The table with a few hundred thousand lines (client dimesnion) alwsys must be questioned as stored data against the version of the customer at the time-, we wonder just latest_customer what users want to see

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      If consideration would be more efficient to create a dimension that is equivalent to the customer but also stores the most recent version of the client attributes on the line-this means customer dimensuion many more columns but queries could would avoid additional research of this array of rank k 30.

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      At the monent users request latest_customer to say would get all customers belonging to a certain multiple string.

      If change as above, then they would be interviewing the customer with a few hundred thousand lines dimension.

      Thoughts?

      Thank you

      Because a lot depends on the model of data access and data dissemination, we cannot really much more than only sb.  However, keep in mind Oracle accesses data by blocks (copies blocks and sometimes several blocks), in order to become more broad lines could have a paradoxical effect of not getting enough blocks in memory until you need it.

      It can help to visualize how data should be obtained (google something like visual sql and Karen Morton or Jonathan Lewis), as well as see the estimate and rowcounts actual imagined different plans.

  18. 570 or 580... Please explain the advantages/disadvantages

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      The ActionScript code snippet below comes from the sample application BlaseDS cat. Can someone explain please the magic that declares the property object AsyncMessage.body (IMessage.body?) chatMessage? It is not in the docs anywhere, so I think it is not integrated into AsyncMessage. And it is not defined in any of the source app files.

      From a world of strongly typed development, see a property which apparently has no statement and is not instantiated does not pass explicitly you the sniff test.

      Thank you.

      < mx:Script >
      <! [CDATA]
      
      Import mx.messaging.messages.AsyncMessage;
      Import mx.messaging.messages.IMessage;
      
      private void send (): void
      {
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      Msg. Text = "";
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      private void messageHandler(message:IMessage):void
      {
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      }
      
      []] >
      

      Pinch the nose, because it's the 'dynamic' line of Actionscript.  Virtually every class Object drift (http://livedocs.adobe.com/flash/9.0/ActionScriptLangRefV3/Object.html) which is a dictionary of key / value of property.  The {msg.text as an object, "chatMessage"} pair is created to the assignment.

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