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

            Object parameters, Object expectedResult, boolean unique) {
        String schema = getPMFProperty("javax.jdo.mapping.Schema");
        sql = MessageFormat.format(sql, new Object[]{schema});
        if (logger.isDebugEnabled())
            logger.debug("Executing SQL query: " + sql);
        Query query = getPM().newQuery("javax.jdo.query.SQL", sql);
        if (unique) {
            query.setUnique(unique);
        }
        if (candidateClass != null) {
            query.setClass(candidateClass);
        }
        if (resultClass != null) {
            query.setResultClass(resultClass);
        }
        execute(assertion, query, sql, false, 
                parameters, expectedResult, positive);
    }

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     */
    private void delete(String assertion, 
            QueryElementHolder queryElementHolder, boolean asSingleString,
            Object parameters, long expectedNrOfDeletedObjects) {
        PersistenceManager pm = getPM();
        Query query = asSingleString ?
                queryElementHolder.getSingleStringQuery(pm) :
                    queryElementHolder.getAPIQuery(pm);
        delete(assertion, query, queryElementHolder.toString(), 
                parameters, expectedNrOfDeletedObjects);
        boolean positive = expectedNrOfDeletedObjects >= 0;

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        {getPersistentCompanyModelInstance("dept1")}
    };
            
    /** */
    void runTest(PersistenceManager pm, CompanyModelReader reader) {
        Query query;
        Collection expected;
        Object result;
            
        Transaction tx = pm.currentTransaction();
        tx.begin();
        Department dept1 = reader.getDepartment("dept1");
        expected = new HashSet();
        expected.add(reader.getFullTimeEmployee("emp1"));
        expected.add(reader.getFullTimeEmployee("emp2"));
        expected.add(reader.getPartTimeEmployee("emp3"));
            
        // Import Department twice
        query = pm.newQuery(Employee.class);
        query.declareImports("import org.apache.jdo.tck.pc.company.Department; import org.apache.jdo.tck.pc.company.Department;");
        query.declareParameters("Department d");
        query.setFilter("department == d");
        result = query.execute(dept1);
        checkQueryResultWithoutOrder(ASSERTION_FAILED, "department == d",
                result, expected);


        // Import Department explictly and per type-import-on-demand
        query = pm.newQuery(Employee.class);
        query.declareImports("import org.apache.jdo.tck.pc.company.Department; import org.apache.jdo.tck.pc.company.*");
        query.declareParameters("Department d");
        query.setFilter("department == d");
        result = query.execute(dept1);
        checkQueryResultWithoutOrder(ASSERTION_FAILED, "department == d",
                result, expected);


        // type-import-on-demand twice
        query = pm.newQuery(Employee.class);
        query.declareImports("import org.apache.jdo.tck.pc.company.*; import org.apache.jdo.tck.pc.company.*");
        query.declareParameters("Department d");
        query.setFilter("department == d");
        result = query.execute(dept1);
        checkQueryResultWithoutOrder(ASSERTION_FAILED, "department == d",
                result, expected);


        tx.commit();
        tx = null;

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        String singleStringJDOQL = 
            "SELECT FROM " + Employee.class.getName() + " WHERE this.weeklyhours > " + 
            "(SELECT AVG(e.weeklyhours) FROM " + Employee.class.getName() + " e)";


        // API query
        Query sub = pm.newQuery(Employee.class);
        sub.setResult("avg(this.weeklyhours)");
        Query apiQuery = pm.newQuery(Employee.class);
        apiQuery.setFilter("this.weeklyhours> averageWeeklyhours");
        apiQuery.addSubquery(sub, "double averageWeeklyhours", null);
        executeJDOQuery(ASSERTION_FAILED, apiQuery, singleStringJDOQL, 
                        false, null, expectedResult, true);


        // API query against memory model
        List allEmployees = getAllEmployees(pm);
        apiQuery.setCandidates(allEmployees);
        executeJDOQuery(ASSERTION_FAILED, apiQuery, singleStringJDOQL, 
                        false, null, expectedResult, true);


        // single String JDOQL
        Query singleStringQuery = pm.newQuery(singleStringJDOQL);
        executeJDOQuery(ASSERTION_FAILED, singleStringQuery, singleStringJDOQL, 
                        false, null, expectedResult, true);
    }

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            TimeZone.getTimeZone("America/New_York"), Locale.US);
        cal.set(2002, Calendar.SEPTEMBER, 1, 0, 0, 0);
        Date hired = cal.getTime();


        // API query
        Query sub = pm.newQuery(Employee.class);
        sub.setResult("avg(this.weeklyhours)");
        Query apiQuery = pm.newQuery(Employee.class);
        apiQuery.setFilter("this.hiredate > :hired && this.weeklyhours > averageWeeklyhours");
        apiQuery.addSubquery(sub, "double averageWeeklyhours", null);
        executeJDOQuery(ASSERTION_FAILED, apiQuery, singleStringJDOQL, 
                        false, new Object[]{hired}, expectedResult, true);


        // API query against memory model
        List allEmployees = getAllEmployees(pm);
        apiQuery.setCandidates(allEmployees);
        executeJDOQuery(ASSERTION_FAILED, apiQuery, singleStringJDOQL, 
                        false, new Object[]{hired}, expectedResult, true);


        // single String JDOQL
        Query singleStringQuery = pm.newQuery(singleStringJDOQL);
        executeJDOQuery(ASSERTION_FAILED, singleStringQuery, singleStringJDOQL, 
                        false, new Object[]{hired}, expectedResult, true);
    }

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            "SELECT FROM " + Employee.class.getName() + " WHERE this.weeklyhours > " +
            "(SELECT AVG(e.weeklyhours) FROM this.department.employees e " + 
            " WHERE e.manager == this.manager)";


        // API query
        Query sub = pm.newQuery(Employee.class);
        sub.setResult("avg(this.weeklyhours)");
        sub.setFilter("this.manager == :manager");
        Query apiQuery = pm.newQuery(Employee.class);
        apiQuery.setFilter("this.weeklyhours> averageWeeklyhours");
        apiQuery.addSubquery(sub, "double averageWeeklyhours", 
                             "this.department.employees", "this.manager"); 
        executeJDOQuery(ASSERTION_FAILED, apiQuery, singleStringJDOQL, 
                        false, null, expectedResult, true);


        // API query against memory model
        List allEmployees = getAllEmployees(pm);
        apiQuery.setCandidates(allEmployees);
        executeJDOQuery(ASSERTION_FAILED, apiQuery, singleStringJDOQL, 
                        false, null, expectedResult, true);


        // single String JDOQL
        Query singleStringQuery = pm.newQuery(singleStringJDOQL);
        executeJDOQuery(ASSERTION_FAILED, singleStringQuery, singleStringJDOQL, 
                        false, null, expectedResult, true);
    }

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            TimeZone.getTimeZone("America/New_York"), Locale.US);
        cal.set(2002, Calendar.SEPTEMBER, 1, 0, 0, 0);
        Date hired = cal.getTime();


        // API query
        Query sub = pm.newQuery(Employee.class);
        sub.setResult("avg(this.weeklyhours)");
        sub.setFilter("this.manager == :manager");
        Query apiQuery = pm.newQuery(Employee.class);
        apiQuery.setFilter("this.hiredate > :hired && this.weeklyhours> averageWeeklyhours");
        apiQuery.addSubquery(sub, "double averageWeeklyhours", null, "this.manager"); 
        executeJDOQuery(ASSERTION_FAILED, apiQuery, singleStringJDOQL, 
                        false, new Object[] {hired}, expectedResult, true);


        // API query against memory model
        List allEmployees = getAllEmployees(pm);
        apiQuery.setCandidates(allEmployees);
        executeJDOQuery(ASSERTION_FAILED, apiQuery, singleStringJDOQL, 
                        false, new Object[] {hired}, expectedResult, true);


        // single String JDOQL
        Query singleStringQuery = pm.newQuery(singleStringJDOQL);
        executeJDOQuery(ASSERTION_FAILED, singleStringQuery, singleStringJDOQL, 
                        false, new Object[]{hired}, expectedResult, true);
    }

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            "SELECT FROM " + Employee.class.getName() + " WHERE this.weeklyhours > " +
            "(SELECT AVG(e.weeklyhours) FROM " + Employee.class.getName() +
            " e WHERE e.manager == this.manager)";


        // API query
        Query sub = pm.newQuery(Employee.class);
        sub.setResult("avg(this.weeklyhours)");
        sub.setFilter("this.manager == :manager");
        Query apiQuery = pm.newQuery(Employee.class);
        apiQuery.setFilter("this.weeklyhours > averageWeeklyhours");
        apiQuery.addSubquery(sub, "double averageWeeklyhours", null, "this.manager"); 
        executeJDOQuery(ASSERTION_FAILED, apiQuery, singleStringJDOQL, 
                        false, null, expectedResult, true);


        // API query against memory model
        List allEmployees = getAllEmployees(pm);
        apiQuery.setCandidates(allEmployees);
        executeJDOQuery(ASSERTION_FAILED, apiQuery, singleStringJDOQL, 
                        false, null, expectedResult, true);


        // single String JDOQL
        Query singleStringQuery = pm.newQuery(singleStringJDOQL);
        executeJDOQuery(ASSERTION_FAILED, singleStringQuery, singleStringJDOQL, 
                        false, null, expectedResult, true);
    }

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        String singleStringJDOQL = 
            "SELECT FROM " + Employee.class.getName() + " WHERE this.weeklyhours > " + 
            "(" + singleStringJDOQLSubquery + ")";


        // execute subquery
        Query sub = pm.newQuery(Employee.class);
        sub.setResult("avg(this.weeklyhours)");
        executeJDOQuery(ASSERTION_FAILED, sub, singleStringJDOQLSubquery, 
                        false, null, averageWeeklyHours, true);


        // execute API query
        Query apiQuery = pm.newQuery(Employee.class);
        apiQuery.setFilter("this.weeklyhours> averageWeeklyhours");
        apiQuery.addSubquery(sub, "double averageWeeklyhours", null);
        executeJDOQuery(ASSERTION_FAILED, apiQuery, singleStringJDOQL, 
                        false, null, expectedResult, true);


        // execute subquery again
        executeJDOQuery(ASSERTION_FAILED, sub, singleStringJDOQLSubquery,

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            "(SELECT AVG(e.weeklyhours) FROM " + Employee.class.getName() + " e)";


        // create subquery instance using different pm
        PersistenceManager newPM = 
            pm.getPersistenceManagerFactory().getPersistenceManager();
        Query sub = newPM.newQuery(Employee.class);
        sub.setResult("avg(this.weeklyhours)");


        Query apiQuery = pm.newQuery(Employee.class);
        apiQuery.setFilter("this.weeklyhours> averageWeeklyhours");
        apiQuery.addSubquery(sub, "double averageWeeklyhours", null);
        executeJDOQuery(ASSERTION_FAILED, apiQuery, singleStringJDOQL, 
                        false, null, expectedResult, true);
    }

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