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populate data

I want to present data  in my jsp page as follows...


project1
-subproject1
-subproject2

project2
-subproject1
-subproject2
-subproject3





My SQL query from database is returning rows like this..

project1,subproject1
project1,subproject2
project2,subproject1
project2,subproject2
project2,subproject3

Question:  Which way I need to populate the data so that I can display data in jsp as show above ?
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cofactor
Asked:
cofactor
1 Solution
 
Gurvinder Pal SinghCommented:
you need to use a hashmap, with the key being the project id (project1, project2 etc), and the value being the list of subprojects.

Map<String, List<String>>();

you can then iterate the map (along with list inside it) in JSP to show this data.
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cofactorAuthor Commented:
>>>with the key being the project id (project1, project2 etc), and the value being the list of >>subprojects.

How do  you  get  the key and the  corresponding list of subprojects from the below resultset ?


My SQL query from database is returning rows like this..

project1,subproject1
project1,subproject2
project2,subproject1
project2,subproject2
project2,subproject3
0
 
kabanzaferCommented:
I don't know the structure of your code but you can also use an object oriented approach in your db classes. For example you may have a class named Project encapsulating SubProject classes extending the super class as a list. Such as the code below. Then you may iterate over a list of Project classes in your jsp. There are many ways but you need to choose the one that fits your code structure most. Hope this helps.
   
public class Project[
  String name;
  List<Project> subClasses;
  ...
}

public class SubProject extends Project{
   ....
}

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kabanzaferCommented:
While iterating in the resultset you have to check the list you are holding for the projects. If you have that project you have to insert into the subproject list of that project; if you don't, you have to create a project with a list containing the current subproject  
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msk_apkCommented:
normally its not advisable to write java code in jsp. if ur allowed to do so, then following logic can be used. this is just a pseudo code only, suitable methods can be added I believe.

<%
String currentProject = null;

for(eachRow in Rows)
{
        String tempProject = row.getElement(0);
        String  subproject = row.getElement(1);
        if(tempProject.equals(currentProject))
        { %>
       <%= subproject %>
         
       <% } else { currentProject = tempProject; %>
       <%= tempProject %>
       <% = subproject %>
   
<%} %>

if this has to be used in multiple places this can be added as Bean and <jsp:useBean> tag can be used to avoid java code.
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cofactorAuthor Commented:
@kabanzafer
your code is erroneous . you have List<Project> subClasses;  inside a Project class  ... this is wrong.  A Project has a list of subprojects.

@msk_apk
I dont like your code .Also, I can not afford your jsp code.  This is pretty inconvenient . I wish to populate the data in VO classes and then iterate the VO  .

 
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kabanzaferCommented:
I assume subprojects extends projects so List<Projects> is not wrong there. That's called polymorphism in OO programming.
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gops1Commented:
You can also think about getting only the project, instead of getting the project and sub project together. Once you have the main project on page, can use Ajax approach to get the sub project. That also improves the performance.
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cofactorAuthor Commented:
>>>Once you have the main project on page, can use Ajax approach to get the sub project.

In that case there will be several  Ajax calls ...is not it ?  

As my MySQL query is returning project and sub project together , cant we just put them into VO class and display in the jsp.

 I'm stuck with the data population into VO so that for a given project ,I get the subprojects .
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cofactorAuthor Commented:
Excellent
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