Examples of javax.jdo.Query

javax.jdo.Query
The Query interface allows applications to obtain persistent instances, values, and aggregate data from the data store. The {@link PersistenceManager} is the factory for Query instances. There may be many Query instances associated with a PersistenceManager. Multiple queries might be executed simultaneously by different threads, but the implementation might choose to execute them serially. In either case, the implementation must be thread safe.
There are three required elements in a Query: the class of the results, the candidate collection of instances, and the filter.
There are optional elements: parameter declarations, variable declarations, import statements, ordering and grouping specifications, result and result class, the range of results, and flags indicating whether the query result is unique and whether the query can be modified.
The query namespace is modeled after methods in Java:
- setClass corresponds to the class definition
- declareParameters corresponds to formal parameters of a method
- declareVariables corresponds to local variables of a method
- setFilter and setOrdering correspond to the method body
There are two namespaces in queries. Type names have their own namespace that is separate from the namespace for fields, variables and parameters.
The method setClass introduces the name of the candidate class in the type namespace. The method declareImports introduces the names of the imported class or interface types in the type namespace. Imported type names must be unique. When used (e.g. in a parameter declaration, cast expression, etc.) a type name must be the name of the candidate class, the name of a class or interface imported by method declareImports, or denote a class or interface from the same package as the candidate class.
The method setClass introduces the names of the candidate class fields.
The method declareParameters introduces the names of the parameters. A name introduced by declareParameters hides the name of a candidate class field of the same name. Parameter names must be unique.
The method declareVariables introduces the names of the variables. A name introduced by declareVariables hides the name of a candidate class field if equal. Variable names must be unique and must not conflict with parameter names.
The result of the query by default is a list of result class instances, but might be specified via setResult. The class of the result by default is the candidate class, but might be specified via setResultClass.
A hidden field may be accessed using the 'this' qualifier: this.fieldName.
The Query interface provides methods which execute the query based on the parameters given. They return a single instance or a List of result class instances which the user can iterate to get results. The signature of the execute methods specifies that they return an Object which must be cast to the appropriate result by the user.
Any parameters passed to the execute methods are used only for this execution, and are not remembered for future execution. @version 2.1

    email = TextTools.cleanJID(email);
    
    DataManager dm = DataManagerFactory.getInstance();
    PersistenceManager pm = dm.newPersistenceManager();


    Query qUser = pm.newQuery(User.class);
    qUser.setFilter("id == email");
    qUser.declareParameters("String email");
    qUser.setRange(0, 1);
    qUser.setUnique(true);


    User user = (User) qUser.execute(email);


    if (user == null) {
      qUser.closeAll();
      return false;
    }


    Blog blog = pm.getObjectById(Blog.class, new Long(blogId));


    Query q = pm.newQuery(Subscription.class);
    q.setFilter("userKey == uid && blogKey == bid");
    q.declareParameters("com.google.appengine.api.datastore.Key uid, com.google.appengine.api.datastore.Key bid");
    q.setRange(0, 1);


    @SuppressWarnings("unchecked")
    List<Subscription> list = (List<Subscription>) q.execute(user.getKey(),
        blog.getKey());


    if (list.size() > 0) {
      pm.currentTransaction().begin();
      pm.deletePersistent(list.get(0));
      pm.currentTransaction().commit();
      pm.flush();


    }
    q.closeAll();
    pm.close();


    return true;
  }

View Full Code Here

  private BlogEntry findNextEntry(Subscription sub) {
    checkArguments(this.currentManager != null,
        "current PersistenceManager is null");


    // find oldest entry from blog subscription which haven't been sent
    Query q = this.currentManager.newQuery(BlogEntry.class);
    q.setFilter("blogKey == blog && pubDate > date");
    q.setOrdering("pubDate");
    q.declareParameters("com.google.appengine.api.datastore.Key blog, java.util.Date date");
    q.setUnique(true);
    q.setRange(0, 1);


    // find blog entry
    BlogEntry entryToPush = (BlogEntry) q.execute(sub.getBlogKey(),
        sub.getLatestEntryNotifiedDate());


    q.closeAll();


    return entryToPush;
  }

View Full Code Here


  @SuppressWarnings("unchecked")
  public static Tube getByTubeId(String tubeId) {
    initPm();
    Tube tube = null;
    Query query = pm.newQuery(Tube.class);
    query.setFilter("tubeId=='" + tubeId + "' && status==1");
    query.setRange(0, 1);
    List<Tube> listResult = (List<Tube>) query.execute();
    if (listResult.size() > 0) {
      tube = listResult.get(0);
    }
    return tube;
  }

View Full Code Here

  }


  @SuppressWarnings("unchecked")
  public static List<Tube> getTop10View() {
    initPm();
    Query query = pm.newQuery(Tube.class);
    query.setFilter("status==1");
    query.setOrdering("viewCount desc");
    query.setRange(0, 10);
    List<Tube> listResult = (List<Tube>) query.execute();
    return listResult;
  }

View Full Code Here

  @SuppressWarnings("unchecked")
  public static List<Tube> getByCategory(String alias, int page,
      int itemPerPage) {
    initPm();
    page = page - 1;
    Query query = pm.newQuery(Tube.class);
    query.setFilter("categoryAlias=='" + alias + "' && status==1");
    query.setOrdering("categoryIndex asc");
    query.setRange(itemPerPage * page, itemPerPage * page + itemPerPage);
    return (List<Tube>) query.execute();
  }

View Full Code Here

  }


  @SuppressWarnings("unchecked")
  public static List<Tube> getAllByCategory(String alias) {
    initPm();
    Query query = pm.newQuery(Tube.class);
    query.setFilter("categoryAlias=='" + alias + "' && status==1");
    query.setOrdering("categoryIndex asc");
    return (List<Tube>) query.execute();
  }

View Full Code Here


  @SuppressWarnings("unchecked")
  public static List<Category> all() {
    initPm();
    List<Category> result = new ArrayList<Category>();
    Query query = pm.newQuery(Category.class);
    query.setFilter("status==1");
    query.setOrdering("index asc");
    result = (List<Category>) query.execute();
    return result;
  }

View Full Code Here


  @SuppressWarnings("unchecked")
  public static List<Category> getTop4() {
    initPm();
    List<Category> result = new ArrayList<Category>();
    Query query = pm.newQuery(Category.class);
    query.setFilter("status==1");
    query.setOrdering("index asc");
    query.setRange(0, 4);
    result = (List<Category>) query.execute();
    return result;
  }

View Full Code Here


  @SuppressWarnings("unchecked")
  public static Category getByCateAlias(String alias) {
    initPm();
    Category cate = null;
    Query query = pm.newQuery(Category.class);
    query.setFilter("alias=='" + alias + "' && status==1");
    query.setRange(0, 1);
    List<Category> listResult = (List<Category>) query.execute(alias);
    if (listResult.size() > 0) {
      cate = listResult.get(0);
    }
    return cate;
  }

View Full Code Here


  @SuppressWarnings("unchecked")
  public static long getMaxIndex() {
    initPm();
    try {
      Query query = pm.newQuery(Category.class);
      query.setFilter("status==1");
      query.setOrdering("index desc");
      List<Category> listResult = (List<Category>) query.execute();
      if (listResult != null && listResult.size() > 0) {
        return listResult.get(0).getIndex();
      } else {
        return 0;
      }

View Full Code Here

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