Modify and Query the JCR

JCR Queries

I highly recommend downloading and "studying" the JCR Query Cheatsheet [^1].

QueryBuilder

The QueryBuilder API executes a query which can be customized via a predicates hashmap. The below configuration creates a query that searches for nodes below a given path, that have two predefined property key/value pairs.

Using the QueryBuilder is strongly advised when you need to sanitze input. For example in a servlet, where the user can customize the query via request parameter.

final HashMap<String, String> properties = new HashMap<>();
// predicates
properties.put("path", "/content/mysite");
properties.put("group.1_property", "some-property-name1");
properties.put("group.1_property.value", "some-property-value1);
properties.put("group.2_property", "some-property-name2");
properties.put("group.2_property.value", "some-property-value2);

// config
properties.put("p.offset", "0");
properties.put("p.limit", "-1");

The above configuration can be passed to the QueryBuilder.

@Reference
private QueryBuilder builder;

private List<Hit> executeQuery(SlingHttpServletRequest request, HashMap<String, String> properties) {
    final Session session = request.getResourceResolver().adaptTo(Session.class);
    final com.day.cq.search.Query query = builder.createQuery(PredicateGroup.create(properties), session);
    final SearchResult result = query.getResult();
    return result.getHits();
}

SQL2

When the query does not need to be sanitized, resourceResolver.findResources() can be used to query content in a simpler way which is more similar to a classic SQL query.

The below query searches for nodes below a given path. These nodes need to have the resourceType of the TestModel and the nodes paths needs to include the given locale.

final String myQuery = "SELECT * FROM [nt:base] AS s " +
                "WHERE ISDESCENDANTNODE([/content/experience-fragments]) " +
                "AND [sling:resourceType] = '" + TestModel.RESOURCE_TYPE + "'  " +
                "AND [jcr:path] LIKE '%" + locale.toLowerCase() + "%'";
final Iterator<Resource> questionResources = request.getResourceResolver().findResources(myQuery, Query.JCR_SQL2);

Session API / JCR API

To use the JCR API, add the jackrabbit-standalone-2.4.0.jar file to your Java application’s class path. You can obtain this JAR file from the Java JCR API web page at jackrabbit.apache.org.

import javax.jcr.Repository;
import javax.jcr.Session;
import javax.jcr.SimpleCredentials;
import javax.jcr.Node;

import org.apache.jackrabbit.commons.JcrUtils;
import org.apache.jackrabbit.core.TransientRepository;

// class XX function yy

try {
    //Create a connection to the CQ repository running on local host
    Repository repository = JcrUtils.getRepository("http://localhost:4503/crx/server");

    //Create a Session
    javax.jcr.Session session = repository.login(new SimpleCredentials("admin", "admin".toCharArray()));

    //Create a node that represents the root node
    Node root = session.getRootNode();

    // Store content
    Node adobe = root.addNode("adobe");
    Node day = adobe.addNode("day");
    day.setProperty("message", "Adobe CQ is part of the Adobe Digital Marketing Suite!");

    // Retrieve content
    Node node = root.getNode("adobe/day");
    System.out.println(node.getPath());
    System.out.println(node.getProperty("message").getString());

    // Save the session changes and log out
    session.save();
    session.logout();
} catch (Exception e) {
  e.printStackTrace();
}

Groovy Console

Groovy Console Github

Simple Query Example

/*
SQL QUERY with Groovy Script.
@author Hashim Khan */
/*This method is used to Query the JCR and find results as per the Query.*/
def buildQuery(page, term) {
    def queryManager = session.workspace.queryManager;
    def statement = 'select * from nt:base where jcr:path like \'' + page.path + '/%\' and sling:resourceType = \'' + term + '\'';
    /*Here term is the sling:resourceType property value*/
    queryManager.createQuery(statement, 'sql');
}

/*Defined Content Hierarchy */
final def page = getPage('/content/geometrixx/en/')
/*Template which is searched in the content hierarchy */
final def query = buildQuery(page, 'geometrixx/components/contentpage');
final def result = query.execute()
final def count = result.getRows().getSize();

println 'No Of pages found = ' + result.nodes.size();

result.nodes.each {
    node - >
        println 'nodePath::' + node.path
}

// > delete all jcr:language props below backoffice

//delete all jcr:language props below backoffice
import javax.jcr.Session

Session session = slingRequest.getResourceResolver().adaptTo(Session.class)

def buildQuery() {
    def queryManager = session.workspace.queryManager

    def statement = "/jcr:root/content/eurowings//*[@jcr:language]"
    queryManager.createQuery(statement, 'xpath')
}

final def query = buildQuery()
final def result = query.execute()

result.nodes.each { node ->
    String nodePath = node.path
    if (nodePath.contains('backoffice')) {
        println 'Deleting prop below  :' + nodePath
        node.getProperty('jcr:language').remove()
        session.save()
    }
}

Further Groovy Examples on Github

Delete Inbox Notifications

To delete AEM Inbox Notifications, just delete /var/taskmanagement/tasks. Locally via CRX/DE and on deployed environments via "empty" Content-Package.

References

[^1] https://experienceleague.adobe.com/docs/experience-manager-65/deploying/practices/best-practices-for-queries-and-indexing.html?lang=en#jcrquerycheatsheet>