How can I get enable sorting on a dataTable?

Question

I've dataTable-element and I want the content to be sortable. I'm using the following code:

<p:dataTable value="#{data.projects}" var="project" paginator="true" rows="10" paginatorPosition="top">

<p:column sortBy="project['project_id']" headerText="Projekt-Nr.">
<h:outputText value="#{project['project_id']}" />
</p:column>

[...]

I think the sortBy-Attribute is wrong - I fiddled around a bit but no success. I'm thankful for help.

Accepted Answer

The sorting of the DataTable works different with Recordset and List<e>.

If you have a recordset you can sort like this: sortBy="#{project['project_id']}"

<p:dataTable value="#{data.projects}" var="project" paginator="true" rows="10" paginatorPosition="top">
    <p:column sortBy="#{project['project_id']}" headerText="Projekt-Nr.">
        <h:outputText value="#{project['project_id']}" />
    </p:column>

If you have List<e> it works like Daniel said: sortBy="project_id" You have directly access to your properties in the list.

<p:dataTable value="#{data.projects}" var="project" paginator="true" rows="10" paginatorPosition="top">
<p:column sortBy="project_id" headerText="Projekt-Nr.">
<h:outputText value="#{project.project_id}" />
</p:column>

I think they have diffrence because of the structur.

RS:Recordset project = new Recordset(["project_id", "projectname", ...]

List: List<project> --> Project class: project_id, procjetname with getter and setter classes.

How can I get enable sorting on a dataTable?

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