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

     * @param cln The extent to query
     * @return The query
     */
    public synchronized Query newQuery(Extent cln)
    {
        Query query = newQuery();
        query.setClass(cln.getCandidateClass());
        query.setCandidates(cln);
        return query;
    }

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     * @param cln The collection
     * @return The query
     */
    public synchronized Query newQuery(Class cls, Collection cln)
    {
        Query query = newQuery();
        query.setClass(cls);
        query.setCandidates(cln);
        return query;
    }

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     * @param filter A filter to apply
     * @return The query
     */
    public synchronized Query newQuery(Class cls, String filter)
    {
        Query query = newQuery();
        query.setClass(cls);
        query.setFilter(filter);
        return query;
    }

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     * @param filter A filter to apply
     * @return The query
     */
    public synchronized Query newQuery(Class cls, Collection cln, String filter)
    {
        Query query = newQuery();
        query.setClass(cls);
        query.setCandidates(cln);
        query.setFilter(filter);
        return query;
    }

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     * @param filter A filter to apply
     * @return The query
     */
    public synchronized Query newQuery(Extent cln, String filter)
    {
        Query query = newQuery();
        query.setClass(cln.getCandidateClass());
        query.setCandidates(cln);
        query.setFilter(filter);
        return query;
    }

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        {
            throw new JDOUserException(LOCALISER_JDO.msg("011005", queryName, cls));
        }


        // Create the Query
        Query query = newQuery(qmd.getLanguage().toString(), qmd.getQuery());
        if (cls != null)
        {
            query.setClass(cls);
            if (!objectMgr.getStoreManager().managesClass(cls.getName()))
            {
                // Load the candidate class since not yet managed
                objectMgr.getStoreManager().addClass(cls.getName(), clr);
            }
        }


        // Optional args that should only be used with SQL
        if (qmd.getLanguage() == QueryLanguage.JDOQL && (qmd.isUnique() || qmd.getResultClass() != null))
        {
            throw new JDOUserException(LOCALISER_JDO.msg("011007", queryName));
        }
        if (qmd.isUnique())
        {
            query.setUnique(true);
        }
        if (qmd.getResultClass() != null)
        {
            // Set the result class, allowing for it being in the same package as the candidate
            Class resultCls = null;
            try
            {
                resultCls = clr.classForName(qmd.getResultClass());
            }
            catch (ClassNotResolvedException cnre)
            {
                try
                {
                    String resultClassName = cls.getPackage().getName() + "." + qmd.getResultClass();
                    resultCls = clr.classForName(resultClassName);
                }
                catch (ClassNotResolvedException cnre2)
                {
                    throw new JDOUserException(LOCALISER_JDO.msg("011008", queryName, qmd.getResultClass()));
                }
            }
            query.setResultClass(resultCls);
        }


        // Add any JPOX extensions
        if (qmd.getLanguage() == QueryLanguage.JPOXSQL)
        {
            // Apply any imports specified
            if (qmd.hasExtension("imports"))
            {
                query.declareImports(qmd.getValueForExtension("imports"));
            }
            // Apply any parameters specified
            if (qmd.hasExtension("parameters"))
            {
                query.declareParameters(qmd.getValueForExtension("parameters"));
            }
        }
        if (qmd.isUnmodifiable())
        {
            query.setUnmodifiable();
        }
        if (qmd.getFetchPlanName() != null)
        {
            // Apply any named FetchPlan to the query
            FetchPlanMetaData fpmd =

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     */
    protected void runSimplePrimitiveTypesQuery(String filter, 
                                                PersistenceManager pm,
                                                Collection expected,
                                                String assertion) {
        Query q = pm.newQuery();
        q.setClass(PrimitiveTypes.class);
        q.setFilter(filter);
        Collection results = (Collection)q.execute();
        if (debug)
            logger.debug("execute '" + filter + "' returns " +  results.size() +
                         " instance(s)");
        checkQueryResultWithoutOrder(assertion, filter, results, expected);
    }

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                                                   String paramDecl,
                                                   Object paramValue,
                                                   PersistenceManager pm,
                                                   Collection expected,
                                                   String assertion) {
        Query q = pm.newQuery();
        q.setClass(PrimitiveTypes.class);
        q.setFilter(filter);
        q.declareParameters(paramDecl);
        Collection results = (Collection)q.execute(paramValue);
        if (debug)
            logger.debug("execute '" + filter + "' with param '" + paramValue +
                         "' returns " +  results.size() + " instance(s)");
        checkQueryResultWithoutOrder(assertion, filter, results, expected);
    }

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    private void compile(String assertion, 
            QueryElementHolder queryElementHolder, boolean asSingleString,  
            String singleStringQuery, boolean positive) {
        PersistenceManager pm = getPM();
        try {
            Query query;
            if (queryElementHolder != null) {
                if (asSingleString) {
                    query = queryElementHolder.getSingleStringQuery(pm);
                } else {
                    query = queryElementHolder.getAPIQuery(pm);

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     */
    private Object execute(String assertion, 
            QueryElementHolder queryElementHolder, boolean asSingleString,
            Object parameters, Object expectedResult) {
        PersistenceManager pm = getPM();
        Query query = asSingleString ?
                queryElementHolder.getSingleStringQuery(pm) :
                    queryElementHolder.getAPIQuery(pm);
        Object result = execute(assertion, query, 
                queryElementHolder.toString(), 
                queryElementHolder.hasOrdering(), parameters,

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