Skip to main content

Query for Component Presentations

Image
By
Use LimitFilter, SortParameter, CPAssembler, CPFactory

The following sample queries the Content Delivery database for Components in a given Publication by using the PublicationCriteria and ItemTypeCriteria.

It also uses a ResultFilter in the form of a LimitFilter and a SortParameter to only retrieve a maximum set of Components in the given sort order (descending according to their last-publish-date).

For each of the identified Components (if any), we retrieve the Dynamic Component Presentation using the CT with the highest priority. Finally, we feed these DCPs into the ComponentPresentationAssembler in order to retrieve their actual content.

<%
    JSPPage jspPage = new JSPPage(pageContext, "tcm:83-3246-64");
    cpAssembler = new ComponentPresentationAssembler(jspPage);
    Query query = new Query();

    PublicationCriteria publicationCriteria = new PublicationCriteria(83);
    ItemTypeCriteria itemTypeCriteria = new ItemTypeCriteria(ItemTypes.COMPONENT);
    AndCriteria andCriteria = new AndCriteria(publicationCriteria, itemTypeCriteria);
    query.setCriteria(andCriteria);

    ResultFilter resultFilter = new LimitFilter(2);
    query.setResultFilter(resultFilter);

    SortParameter sortParameter = new SortParameter(
        new ItemLastPublishColumn(), SortDirection.DESCENDING);
    query.addSorting(sortParameter);

    String[] items = query.executeQuery();
    out.println("<p><b>Publication=83 AND ItemType=16 Query: </b>" + list(items) + "</p>");
    out.println("<p><b>DCPs:</b>");
    writeCP(out, items);
    out.println("</p>");
%>

<%!ComponentPresentationAssembler cpAssembler = null;

public String list(String[] items) {
    StringBuilder sb = new StringBuilder();
    for (String item : items) {
        sb.append(item + " ");
    }

    return sb.toString();
}

public void writeCP(JspWriter out, String[] items) throws IOException {
    try {
        if (items == null || items.length == 0) {
            return;
        }

        TCMURI itemUri = new TCMURI(items[0]);
        ComponentPresentationFactory cpFactory = new ComponentPresentationFactory(
            itemUri.getPublicationId());

        for (String compUri : items) {
            ComponentPresentation cp = cpFactory
                .getComponentPresentationWithHighestPriority(compUri);
            if (cp == null) {
                out.println("Found null CP for compUri=" + compUri + "<hr/>");
            } else {
                out.println(cpAssembler.getContent(cp.getComponentId(),
                    cp.getComponentTemplateId()) + "<hr/>");
            }
        }
    } catch (ParseException pe) {
        out.println("ParseException occurred: " + pe);
    }
}%>


Labels:

Comments

Post a Comment

Popular posts from this blog

Toolkit - Performance

By
This post if part of a series about the File System Toolkit  - a custom content delivery API for SDL Tridion. This post presents performance data that was captured for each major functionality with and without caching Linking, CP Assembler, Component Presentation Factory, Dynamic Content Queries, Model Factory. The data was captured on a 2014 Macbook Pro 15", 16 GB RAM, 2.6 GHz Intel Core i7 running OS X El Capitan. Test methodology: each test was run for 3 minutes and the total number of successful Toolkit API calls was measured. Then the number of calls per second was computed 'with cache' and 'without cache' test runs. Then a cache boost factor was calculated by diving (the number of API calls with cache) / (number of API calls without cache). Each cache test was executed 3 times, with different cache time-to-live values of 1 second, 5 seconds and 0 seconds (eternal cache, no expiration). The rationale is to see what impact different cache expiration/evi...
Post a Comment
Read more

Running sp_updatestats on AWS RDS database

By
Part of the maintenance tasks that I perform on a MSSQL Content Manager database is to run stored procedure sp_updatestats . exec sp_updatestats However, that is not supported on an AWS RDS instance. The error message below indicates that only the sa  account can perform this: Msg 15247 , Level 16 , State 1 , Procedure sp_updatestats, Line 15 [Batch Start Line 0 ] User does not have permission to perform this action. Instead there are several posts that suggest using UPDATE STATISTICS instead: https://dba.stackexchange.com/questions/145982/sp-updatestats-vs-update-statistics I stumbled upon the following post from 2008 (!!!), https://social.msdn.microsoft.com/Forums/sqlserver/en-US/186e3db0-fe37-4c31-b017-8e7c24d19697/spupdatestats-fails-to-run-with-permission-error-under-dbopriveleged-user , which describes a way to wrap the call to sp_updatestats and execute it under a different user: create procedure dbo.sp_updstats with execute as 'dbo' as...
2 comments
Read more

A Core Service Java Client

By Unknown
I have seen many times the creation of a .NET client for SDL Tridion's Core Service, but not once a Java client. In .NET / Visual Studio is extremely easy to create the proxy classes based on the service's WSDL. So how hard can it be in Java? The entire code in this example is available in my Google Code project . Which Tool? Doing a bit of research on the multiple ways of creating Java proxy classes for web services left me quite confused as to which framework / utility to use. They are quite a few (AXIS, JAXB, Apache CXF, XFire, NetBeans plugin, IDEA plugin, Eclipse plugin, etc). They seemed to be cumbersome to use, too specific, limited, quirky, buggy, etc. What I wanted was a simple generic too that worked. Enter wsimport.exe ... Generating the Proxies Note: Check out the update post available here  http://yatb.mitza.net/2012/12/java-core-service-trouble-with-datetime.html Wsimport.exe is part of the JDK (mine is located in C:\Progrm Files\Java\jdk1.6.0_33\bin ),...
3 comments
Read more