Suppose i have a Geoserver running with two layers exposed by WFS (with properties):
StreetLayer (geom, StreetName, Lanes, Length)
HouseLayer (geom, Address)
Now if i want to query StreetLayer for all streets but only get the StreetName and Lanes properties I'd send a GET request to this:
http://geoserver/wfs?REQUEST=GetFeature&VERSION=1.1.0&typename=StreetLayer&propertyname=StreetName,Lanes
But what if i now want to query both HouseLayer and StreetLayer? This doesn't work:
http://geoserver/wfs?REQUEST=GetFeature&VERSION=1.1.0&typename=StreetLayer,HouseLayer&propertyname=StreetName,Lanes,Address
I get an exception that says that StreetName and Lanes isn't in HouseLayer and vice versa. Do i need to make multiple requests?
EDIT:
So what i want to do is something like this:
http://geoserver/wfs?REQUEST=GetFeature&VERSION=1.1.0&typename=StreetLayer,HouseLayer&propertyname=(StreetName,Lanes),(Address)
Almost there, you just have an extra comma in propertyName. This one works against the vanilla GeoServer install:
http://localhost:8087/gswps/topp/ows?service=WFS&version=1.0.0&request=GetFeature&typeName=topp:tasmania_cities,topp:tasmania_roads&propertyName=(ADMIN_NAME,CITY_NAME)(TYPE)
The difference: No comma between ) and (
Related
I have a few documents in a mongoDB that have the following structure
In a API web application that I am developing with spring boot I have to code the following query. I can receive a voltageLevelCode to filter register that will contains this voltage level code in the array (That it is easy) but the problem is that i can also receive a voltageLevelCode and a Type, so in this case I have to filter documents that will contains this voltage level code in the array and also WITHIN this voltage level code filter the ones that contains this type (But remember, the type within the voltage level)
I have been trying to write the query but I dont know how to dynamically set the index to filter the types within this voltage level. Something like:
{"voltageLevel.<TheIndexByTheDefinenVoltageLevelCode>.types" : "X" }
Example:
public List<MyClassRepresenting> findByFilter(String type,String voltageLevelCode);
{$and: [{'voltageLevel.voltageLevelCode' : ?1 },{'voltageLevel.<HowTogetIndexForSelectingVoltageLevelCode>.types' : ?2}]}
In this case depending on the tensionLevel received the type parameter must filter according to types within this tensionLevel
Same happens to me with another query. In SQL the equivalent is the SELECT within another SELECT to select the sub registers but no idea about how to do it in mongo.
When asking a question on stackoverflow, it's always interesting to include what you already tried.
I think what you need is a simple $elemMatch:
db.mycoll.find(
{ voltageLevel: { $elemMatch: { voltageLevelCode: "MT", types: "E" } } }
)
Hi I wonder if it is possible to select certain items from the array property of a JSON input of Stream Analytics and return them as an array property of a JSON output.
My example to make it more clear - I send a list of OSGI bundles running on a device with name, version and state of the bundle. (I leave out rest of the content.) Sample message:
{"bundles":[{"name":"org.eclipse.osgi","version":"3.5.1.R35x_v20090827","state":32},{"name":"slf4j.log4j12","version":"1.6.1","state":4}]}
Via Stream Analytics I want to create one JSON output (event hub) for active bundle (state == 32) and put the rest in the different output. Content of those event hubs will be processed later. But in the processing I also need the original Device ID so I fetch it from the IoTHub message properties.
So my query looks like this:
WITH Step1 AS
(
SELECT
IoTHub.ConnectionDeviceId AS deviceId,
bundles as bundles
FROM
iotHubMessages
)
SELECT
messages.deviceId AS deviceId,
bundle.ArrayValue.name AS name,
bundle.ArrayValue.version AS version
INTO
active
FROM
Step1 as messages
CROSS APPLY GetArrayElements(messages.bundles) AS bundle
WHERE
bundle.ArrayValue.state = 32
SELECT
messages.deviceId AS deviceId,
bundle.ArrayValue.name AS name,
bundle.ArrayValue.version AS version
INTO
other
FROM
Step1 as messages
CROSS APPLY GetArrayElements(messages.bundles) AS bundle
WHERE
bundle.ArrayValue.state != 32
This way there is a row for every item of the original array containing deviceId, name and version properties in the active output. So the deviceId property is copied several times, which means additional data in a message. I'd prefer a JSON with one deviceId property and one array property bundles, similar to the original JSON input.
Like active:
{"deviceid":"javadevice","bundles":[{"name":"org.eclipse.osgi","version":"3.5.1.R35x_v20090827"}]}
And other:
{"deviceid":"javadevice","bundles":[{"name":"slf4j.log4j12","version":"1.6.1"}]}
Is there any way to achieve this? - To filter items of array and return it back as an array in the same format as is in the input. (In my code I change number of properties, but that is not necessary.)
Thanks for any ideas!
I think you can achieve this using the Collect() aggregate function.
The only issue I see is that the deviceId property will be outputted in the bundle array as well.
WITH Step1 AS
(
SELECT
IoTHub.ConnectionDeviceId AS deviceId,
bundles as bundles
FROM
iotHubMessages
),
Step2 AS
(
SELECT
messages.deviceId AS deviceId,
bundle.ArrayValue.name AS name,
bundle.ArrayValue.version AS version
bundle.ArrayValue.state AS state
FROM
Step1 as messages
CROSS APPLY GetArrayElements(messages.bundles) AS bundle
)
SELECT deviceId, Collect() AS bundles
FROM Step2
GROUP BY deviceId, state, System.Timestamp
WHERE state = 32
I'm working on a simple rails app that does SMS. I am leveraging Twilio for this via the twilio_ruby gem. I have 10 different phone numbers that I want to be able to send SMS from randomly.
I know if I do something like this:
numbers = ["281-555-1212", "821-442-2222", "810-440-2293"]
numbers.sample
281-555-1212
It will randomly pull one of the values from the array, which is exactly what I want. The problem is I don't want to hardcode all 10 of these numbers into the app or commit them to version control.
So I'm listing them in yaml (secrets.yml) along with my Twilio SID/Token. How can I build an array out of the 10 yaml fields i.e. twilio_num_1, twilio_num_2, etc, etc so that I can call numbers.sample?
Or is there a better way to do this?
You can also use
twilio_numbers:
- 281-555-1122
- 817-444-2222
- 802-333-2222
thus you don't have to write the numbers in one line.
Figured this out through trial and error.
In secrets.yml
twilio_numbers: ["281-555-1122","817-444-2222","802-333-2222"]
In my code:
Rails.application.secrets.twilio_numbers.sample
Works like a charm.
create a file: config/twilio_numbers.yml
---
- 281-555-1122
- 817-444-2222
- 802-333-2222
and load it in your config/application.rb like this:
config.twilio_numbers = YAML.load_file 'config/twilio_numbers.yml'
you can then access the array from inside any file like this:
Rails.application.config.twilio_numbers
=> ["281-555-1122", "817-444-2222", "802-333-2222"]
I'm trying to figure out how to populate a table from a JSON array. So far, I can populate my table cells perfectly fine by using the following code:
self.countries = [[NSArray alloc]initWithObjects:#"Argentina",#"China",#"Russia",nil];
Concerning the JSON, I can successfully retrieve one line of text at a time and display it in a label. My goal is to populate an entire table view from a JSON array. I tried using the following code, but it still won't populate my table. Obviously I'm doing something wrong, but I searched everywhere and still can't figure it out:
NSURL *url = [NSURL URLWithString:#"http://BlahBlahBlah.com/CountryList"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON)
{
NSLog(#"%#",[JSON objectForKey:#"COUNTRIES"]);
self.countries = [JSON objectForKey:#"COUNTRIES"];
}
failure:nil];
[operation start];
I am positive that the data is being retrieved, because the NSLog outputs the text perfectly fine. But when I try setting my array equal to the JSON array, nothing happens. I know the code is probably wrong, but I think I'm on the right track. Your help would be much appreciated.
EDIT:
This is the text in the JSON file I'm using:
{
"COUNTRIES": ["Argentina", "China", "Russia",]
}
-Miles
It seems that you need some basic JSON parsing. If you only target iOS 5.0 and above devices, then you should use NSJSONSerialization. If you need to support earlier iOS versions, then I really recommend the open source JSONKit framework.
Having recommended the above, I myself almost always use the Sensible TableView framework to fetch all data from my web service and automatically display it on a table view. Saves me a ton of manual labor and makes app maintenance a breeze, so it's probably something to consider too. Good luck!
Having some problems with my Silverlight app (with RIA services) filtering my results. The idea is on the client I set up the EntityQuery and its filters and call load. However this isn't working for me.
Heres my code.
public void FireQuery(string filterValue)
{
EntityQuery<Parent> query = m_ParentDomainContext.GetParentQuery();
query = query.Where(p => p.Children.Any(c => c.Name.Contains(filterValue)));
m_ParentDomainContext.Load(query, Query_Completed, null);
}
Compiles just fine, however, runtime I get "Query operator 'Any' is not supported." Exception.
Does anyone know of a good way to filter like this? Again, I'm looking for a way to set this up on the client.
EDIT: I should note, I've tried a few other queries as well, with similar results:
query = query.Where(p => p.Children.Where(c => c.Name.Contains(filterValue)).Count() != 0);
query = query.Where(p => p.Children.Where(c => c.Name.Contains(filterValue)).FirstOrDefault != null);
query = query.Where(p => p.Children.Where(c => c.Name.Contains(filterValue)).Any());
Query Operator 'Count/FirstOrDefault/Any' is not supported. I'm clearly missing something here...
As I tried to play around a little with this, I figured out that methods like First, Any and Count can't be used with LINQ to Entities (and, I believe, even NHibernate) over WCF RIA Services because they're not defined on the IQueryable itself, but, instread, are extention methods defined in the System.Linqnamespace. That is precisely why this shows as a run-time exception and not a compile-time error. The only extension methods that can be used here are those found in System.ServiceModel.DomainServices.Client (such as Where, Skip, Take, OrderBy, etc.).
This has to do with the "EntityQuery" objects, because those need to be composed and sent back to the server, whereas for the collections (such as m_ParentDomainContext.Parents in your case), you can use the System.Linq extension methods freely.
In order to implement this functionality, I suggest, as Thomas Levesque said, to expose it from the server in order to only get the data you want, or, alternatively, you can compose a query using the available constructs (the ones in System.ServiceModel.DomainServices.Client) and then apply the other filters on the resulting data (where you can use extension methods from the System.Linq namespace).
PS: I tried this with both classic Entity Framework and Entity Framework CodeFirst, and had the same results.
I hope this helps