What's the best way to implement an array on OOP?
Hello,
In the attached image, I do a database query with one query string. It opens the connection, makes the query, and closes the connection. The output array is scanned for certain conditions later.
If I have 10 queries I could simply make an array of queries and make an array of replies. Then I could decompose the output array in a for loop and run my evaluations.
In OOP however, I find myself wanting to make each query as an object, to encapsulate it. That is a problem though, because the database resides in a server in another building across town, and the connection to it is slow. So multiple queries take too long.
How do I approach this in OOP?
Or yet another approach...
Use "Composition" pattern to say the connection is a part of the query and implement the connection class using the Singlton pattern.
The Connection method that crates the connection would only make the connection when an open is invoked and the connection does not alreday exist.
So your queries are an array like what seems natural (is that "Cohesion").
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction
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[JHeadstart 10.1.3 build 78]
[JDeveloper 10.1.3 SU4]
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ToineSteven,
Thanks for the reply. Unfortunately whatever we try, we cannot get it to work. We started looking at the second option (since we do need default values also in table lay-out new rows). We created a DefaultValues ViewObject, added it to the Application Module, added an EL expressiona to the Default Display Value property (replacing your ending ")" with a "}" offcourse ;-)), ran the JAG so that a page definition was generated for DefaultValues and we managed to get it prepared when loading for example the Organisation's jspx page. However no default value appears in a new row (not in Form, not in Table layout).
I then created a quick application on top of the HR schema, added a DefaultValues ViewObject using one calculated attribute (set Salary fixed to 1000), added the EL expression to the Salary Default Display Value property in the Employees Group, made sure the DefaultValuesPageDef is prepared by adding it to the parameter section and I see it getting prepared. I also see a managed Bean is created in the Employees-bean.xml.
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2006-08-02 16:01:01.825 WARNING [ADFc] Warning: No Method onCreateEmployees and no actionBinding CreateEmployees found.
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<?xml version="1.0" encoding="windows-1252"?>
<!DOCTYPE faces-config PUBLIC
"-//Sun Microsystems, Inc.//DTD JavaServer Faces Config 1.1//EN"
"http://java.sun.com/dtd/web-facesconfig_1_1.dtd">
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</managed-property>
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<managed-bean-name>searchEmployees</managed-bean-name>
<managed-bean-class>oracle.jheadstart.controller.jsf.bean.JhsSearchBean</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
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<?xml version='1.0' encoding='windows-1252' ?>
<!DOCTYPE ViewObject SYSTEM "jbo_03_01.dtd">
<ViewObject
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<Attr Name="_version" Value="10.1.3.36.73" />
<Attr Name="_codeGenFlag2" Value="Access|Coll|VarAccess" />
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<ViewAttribute
Name="Salary"
IsUpdateable="false"
IsPersistent="false"
Precision="255"
Type="java.lang.String"
ColumnType="VARCHAR2"
AliasName="SALARY"
Expression="1000"
SQLType="VARCHAR" >
</ViewAttribute>
</ViewObject>
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<?xml version="1.0" encoding="UTF-8" ?>
<pageDefinition xmlns="http://xmlns.oracle.com/adfm/uimodel"
version="10.1.3.36.73" id="DefaultValuesPageDef"
Package="hr.view.pagedefs" EnableTokenValidation="false">
<parameters/>
<executables>
<iterator id="DefaultValuesIterator"
Binds="AppModuleDataControl.DefaultValues1"
DataControl="AppModuleDataControl" RangeSize="10"/>
</executables>
<bindings>
<attributeValues id="DefaultValuesSalary"
IterBinding="DefaultValuesIterator">
<AttrNames>
<Item Value="Salary"/>
</AttrNames>
</attributeValues>
<table id="DefaultValuesTable" IterBinding="DefaultValuesIterator">
<AttrNames>
<Item Value="Salary"/>
</AttrNames>
</table>
<action id="FirstDefaultValues" IterBinding="DefaultValuesIterator"
DataControl="AppModuleDataControl" RequiresUpdateModel="true"
Action="12"/>
<action id="PreviousDefaultValues" IterBinding="DefaultValuesIterator"
DataControl="AppModuleDataControl" RequiresUpdateModel="true"
Action="11"/>
<action id="NextDefaultValues" IterBinding="DefaultValuesIterator"
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Action="10"/>
<action id="LastDefaultValues" IterBinding="DefaultValuesIterator"
DataControl="AppModuleDataControl" RequiresUpdateModel="true"
Action="13"/>
<methodAction RequiresUpdateModel="true" Action="999"
id="advancedSearchDefaultValues"
IterBinding="DefaultValuesIterator"
DataControl="AppModuleDataControl"
InstanceName="AppModuleDataControl.dataProvider"
MethodName="advancedSearch"
ReturnName="AppModuleDataControl.methodResults.AppModuleDataControl_dataProvider_advancedSearch_result"
IsViewObjectMethod="false">
<NamedData NDName="viewObjectUsage"
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NDType="java.lang.String"/>
<NamedData NDName="arguments" NDValue="#{searchDefaultValues.arguments}"
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<NamedData NDName="allConditionsMet"
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<action id="setCurrentRowWithKeyDefaultValues"
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DataControl="AppModuleDataControl" RequiresUpdateModel="false"
Action="96">
<NamedData NDName="rowKeyStr" NDValue="#{row.rowKeyStr}"
NDType="java.lang.String"/>
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Action="40"/>
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</bindings>
</pageDefinition>
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Using the values in a 1D array, I need to place them along the diagonal of a 2D array. Currently, I've been using INITIALIZE ARRAY VI to create 2D array of zeroes and then usE REPLACE ARRAY SUBSET to put the 1D array values on the diagonal. This works sometimes but I often get an error stating that the memory is full and that the application was stopped at INITIALIZE ARRAY.
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Edited by: 938864 on Jun 5, 2012 11:16 PM938864 wrote:
Hi Kayaman,
Sorry but I don't agree with you on verification part, Why not I can verify it ? to me default means value when I don't specify -Xms and -Xmx and by the way I was testing that program on 32 bit JRE 1.6 on Windows. I am also curious significant difference between 128MB and 870MB I saw, do you see anything obviously wrong ?That spec is outdated. Since Java 6 update 18 (Sun/Oracle implementation) the default maximum heap space is calculated based on total memory availability, but never more than 1GB on 32 bits JVMs / client VMs. On a 64 bits server VM the default can go as high as 32gb.
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Hello everyone!
With continued help from this forum I am getting closer to having a working program. I look forward to being able to help others like myself once I finish learning the AS3 ropes.
I will briefly explain what I am trying to achieve and then follow it up with my question.
Background
I have created a 12 x 9 random number grid that populates each cell with a corresponding image based on each cell's numeric value. I have also created a shuffle button that randomizes the numbers in the grid. The problem I am running into is getting my button-click event to clear the current images off the grid in order to assign new ones (i.e. deleting the display stack objects in order to place news ones in the same locations).
Question
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============================================================================
package
import flash.display.MovieClip;
import flash.display.DisplayObject;
import flash.events.MouseEvent;
import flash.display.Sprite;
import flash.text.TextField;
import flash.text.TextFormat;
import flash.utils.getDefinitionByName;
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while (imageArray.numChildren > 0)
imageArray.removeChildAt(0);
// Shuffles cell numbers (randomizes array).
private function shuffleCells(_array:Array):void
var _number:int = 0;
var _a:int = 0;
var _b:int = 0;
var _rand:int = 0;
for (var i:int = _array.length - 1; i > 0; i--)
_rand = Math.random() * (i - 1);
_a = _array[i];
_b = _array[_rand];
_array[i] = _b;
_array[_rand] = _a;
// Retrieves and assigns a custom image to a cell based on its numerical value.
private function drawCells(_numeral:int):Array
var _classRef:Class = Class(getDefinitionByName("skin" + _numeral));
_classRef.x = 30;
imageArray.push(_classRef);
imageArray.addChild(_classRef);
return imageArray;
===========================================================================
Any help with this is greatly appreciated. Thanks!Rothrock,
Thank you for the reply. Let me address a few things here in the hopes of allowing you (and others) to better understand my reasoning for doing things in this manner (admittedly, there is probably a much better/easier approach to what I am trying to accomplish which is one of the things I hope to learn/discover from these posts).
The elements inside my "imageArray" are all individual graphics that I had imported, changed their type to movie clips using .Sprite as their base class (instead of .MovieClip) and then saved as classes. The reason I did this was because the classes could then be referenced via "getDefinitionByName" by each cell value that was being passed to it. In this grid every number from 1 to 9 appears randomly 12 times each (making the 108 cells which populate the grid). I did not, at the time (nor do I now), know of a better method to implement for making sure that each image appears in the cell that has the corresponding value (i.e. every time a cell has the value of 8 then the custom graphic/class "skin8" will be assigned to it so that the viewer will be able to see a more aesthetically pleasing numerical representation, that is to say a slightly more fancy looking number with a picture behind it). I was advised to store these images in an array so that I could destroy them when I reshuffle the grid in order to make room for the new images (but I probably messed up the instructions).
If the "drawCell" function only returns a sprite rather than the image array itself, doesn't that mean that my "eraseCells" function won't be able to delete the array's children as their values weren't first returned to the global variable which my erasing function is accessing?
As for the function name "drawCells," you have to keep in mind that a) my program has been redesigned in stages as I add new functionality/remove old functionality (such as removing text labels and formatting which were originally in this function) and b) that my program is called "Blanko."
I will try and attach an Illustrator exported JPG file that contains the image I am using as the class "skin7" just to give you an example of what I'm trying to use as labels (although it won't let me insert it here in this post, so I will try it in the next post).
Thank you for your help!
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