Examples of com.mongodb.DBCollection.findOne()

com.mongodb.DBCollection.findOne()
Finds an object by its id. This compares the passed in value to the _id field of the document @param obj any valid object @return the object, if found, otherwise null @throws MongoException

        BasicDBObject key2 = (BasicDBObject) indexInfos.get(2).get("key");


        assertTrue("No index on the field a", key1.containsField("a") && "1".equals(key1.getString("a")));
        assertTrue("No index on the field b", key2.containsField("b") && "-1".equals(key2.getString("b")));


        DBObject b = dynamicCollection.findOne("testInsertDynamicityEnabledDBAndCollection");
        assertNotNull("No record with 'testInsertDynamicityEnabledDBAndCollection' _id", b);


        b = testCollection.findOne("testInsertDynamicityEnabledDBOnly");
        assertNull("There is a record with 'testInsertDynamicityEnabledDBAndCollection' _id in the test collection", b);

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        BasicDBObject key2 = (BasicDBObject) indexInfos.get(2).get("key");


        assertTrue("No index on the field a", key1.containsField("a") && "1".equals(key1.getString("a")));
        assertTrue("No index on the field b", key2.containsField("b") && "-1".equals(key2.getString("b")));


        DBObject b = dynamicCollection.findOne("testInsertDynamicityEnabledCollectionAndIndex");
        assertNotNull("No record with 'testInsertDynamicityEnabledCollectionAndIndex' _id", b);


        b = testCollection.findOne("testInsertDynamicityEnabledDBOnly");
        assertNull("There is a record with 'testInsertDynamicityEnabledDBAndCollection' _id in the test collection", b);

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        BasicDBObject key1 = (BasicDBObject) indexInfos.get(1).get("key");


        assertFalse("No index on the field a", key1.containsField("a") && "-1".equals(key1.getString("a")));


        DBObject b = dynamicCollection.findOne("testInsertDynamicityEnabledCollectionOnlyAndURIIndex");
        assertNotNull("No record with 'testInsertDynamicityEnabledCollectionOnlyAndURIIndex' _id", b);


        b = testCollection.findOne("testInsertDynamicityEnabledCollectionOnlyAndURIIndex");
        assertNull("There is a record with 'testInsertDynamicityEnabledCollectionOnlyAndURIIndex' _id in the test collection", b);

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        BasicDBObject key2 = (BasicDBObject) indexInfos.get(2).get("key");


        assertTrue("No index on the field b", key1.containsField("b") && "-1".equals(key1.getString("b")));
        assertTrue("No index on the field a", key2.containsField("a") && "1".equals(key2.getString("a")));


        DBObject b = collection.findOne("testInsertAutoCreateCollectionAndURIIndex");
        assertNotNull("No record with 'testInsertAutoCreateCollectionAndURIIndex' _id", b);


        b = testCollection.findOne("testInsertAutoCreateCollectionAndURIIndex");
        assertNull("There is a record with 'testInsertAutoCreateCollectionAndURIIndex' _id in the test collection", b);

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        Object o = exchange.getIn().getMandatoryBody();
        DBObject ret;


        DBObject fieldFilter = exchange.getIn().getHeader(MongoDbConstants.FIELDS_FILTER, DBObject.class);
        if (fieldFilter == null) {
            ret = dbCol.findOne(o);
        } else {
            ret = dbCol.findOne(o, fieldFilter);
        }


        Message resultMessage = prepareResponseMessage(exchange, MongoDbOperation.save);

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        DBObject fieldFilter = exchange.getIn().getHeader(MongoDbConstants.FIELDS_FILTER, DBObject.class);
        if (fieldFilter == null) {
            ret = dbCol.findOne(o);
        } else {
            ret = dbCol.findOne(o, fieldFilter);
        }


        Message resultMessage = prepareResponseMessage(exchange, MongoDbOperation.save);
        resultMessage.setBody(ret);
        resultMessage.setHeader(MongoDbConstants.RESULT_TOTAL_SIZE, ret == null ? 0 : 1);

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        DBObject o = exchange.getIn().getMandatoryBody(DBObject.class);
        DBObject ret;


        DBObject fieldFilter = exchange.getIn().getHeader(MongoDbConstants.FIELDS_FILTER, DBObject.class);
        if (fieldFilter == null) {
            ret = dbCol.findOne(o);
        } else {
            ret = dbCol.findOne(o, fieldFilter);
        }


        Message resultMessage = prepareResponseMessage(exchange, MongoDbOperation.findOneByQuery);

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        DBObject fieldFilter = exchange.getIn().getHeader(MongoDbConstants.FIELDS_FILTER, DBObject.class);
        if (fieldFilter == null) {
            ret = dbCol.findOne(o);
        } else {
            ret = dbCol.findOne(o, fieldFilter);
        }


        Message resultMessage = prepareResponseMessage(exchange, MongoDbOperation.findOneByQuery);
        resultMessage.setBody(ret);
        resultMessage.setHeader(MongoDbConstants.RESULT_TOTAL_SIZE, ret == null ? 0 : 1);

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    @CheckForNull
    <T extends Document> T findUncached(Collection<T> collection, String key) {
        DBCollection dbCollection = getDBCollection(collection);
        long start = start();
        try {
            DBObject obj = dbCollection.findOne(getByKeyQuery(key).get());
            if (obj == null) {
                return null;
            }
            T doc = convertFromDBObject(collection, obj);
            if (doc != null) {

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        Object o = exchange.getIn().getMandatoryBody();
        DBObject ret;


        DBObject fieldFilter = exchange.getIn().getHeader(MongoDbConstants.FIELDS_FILTER, DBObject.class);
        if (fieldFilter == null) {
            ret = dbCol.findOne(o);
        } else {
            ret = dbCol.findOne(o, fieldFilter);
        }


        Message resultMessage = prepareResponseMessage(exchange, MongoDbOperation.save);

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