c# - Complex Query LINQ Lambda -


i trying extract data in single query. since involves many tables, sort of stuck @ grouping part.

i not have enough reputation post image of table design. so, giving pk,fk

 sector (sectorid)  device (deviceid:pk, categoryid:fk)  ratio (sectorid,deviceid)  use (useid)  deviceuse (sectorid,deviceid,useid)  family (familyid)  category (categoryid)  level (levelid)  age(ageid)  consu (sectorid,deviceid,levelid)  distributionone (sectorid,deviceid,levelid)  distributiontwo (sectorid,deviceid,levelid, ageid)

what trying achieve is:

given sectorid, retrieve related information tables given.

the result be:

all devices

grouped family

grouped category

and ratios (for given sectorid , deviceid)

and deviceuses (for related sectorid , deviceid) , related use deviceid

and consu (for related deviceid, levelid, ageid) , related age , level

and distributionone (for related deviceid, levelid, sectorid) , related level

and distributiontwo (for related deviceid, levelid, sectorid, ageid) , related age , level

so far got method below.

public ienumerable<userconfig> getdevicetype(int sectorid)     {         var t = repo.getall().asqueryable()                             .select(             c => new userconfig             {                 device = new device { name = c.name, id = c.id },                 distributionone = c.distributionone.where(d => d.sectorid == sectorid && d.deviceid == c.id).tolist(),                 distributiontwo = c.distributiontwo.where(d => d.sectorid == sectorid && d.deviceid == c.id).tolist(),                 consu = c.consu.where(d=>d.deviceid == c.id).tolist(),                 category = c.category,                 family = c.category.family,                 deviceuse = c.deviceuse.where(d => d.sectorid == sectorid && d.deviceid == c.id).tolist(),                 ratios = c.ratios.where(d => d.sectorid == sectorid && d.deviceid == c.id).tolist(),                 use = c.deviceuse.where(d=>d.deviceid==c.id && d.sectorid==sectorid).select(u=>u.use).firstordefault()             });                 var devices = t.tolist();         return devices;     }

where repo repository of device

getall repository method set of devices.

my questions:

  • am doing right way?

  • if yes, how group data nested collection of

families
->categories
--->devices
distributionone
distributiontwo
..etc

  • if not, need correct (my table design?, query?)

use groupby operator:

var t = repo.getall().asqueryable() .groupby(c => c.category.family.id) .select(g => new {     familyid = g.key,     devicesbycategory = g.groupby(c => c.category.id)         .select(g2 => new {             categoryid = g2.key,             devices = g2.select(c => new userconfigs {                 ....         })    }) });

Comments

Post a Comment

Popular posts from this blog

inversion of control - Autofac named registration constructor injection -

does autofac support specifying registration name in components' constructors? example: ninject's namedattribute . you need use autofac.extras.attributed package on top achieve this so let's have 1 interface , 2 classes: public interface ihello { string sayhello(); } public class englishhello : ihello { public string sayhello() { return "hello"; } } public class frenchhello : ihello { public string sayhello() { return "bonjour"; } } then have consumer class, in want select instance injected: public class helloconsumer { private readonly ihello helloservice; public helloconsumer([withkey("en")] ihello helloservice) { if (helloservice == null) { throw new argumentnullexception("helloservice"); } this.helloservice = helloservice; } public string sayhello() { return this.helloservice.sayhello()...
Read more

ios - Change Storyboard View using Seague -

i have following code checks connection server, , depending on want change views if no connection found. nsstring *connect = [nsstring stringwithcontentsofurl:[nsurl urlwithstring:@"http://myserver.com"] encoding:nsutf8stringencoding error:nil]; if (connect == null) { [self performseguewithidentifier:@"network_failure" sender:self]; } else { // other code here } my problem not change views. have added storyboard segue between 2 views identifier of network_failure . not have navigation controller or that, problem? thanks help! no not problem. first of all, in objectivec exists nil object oriented null . must use that. so: if(connect == nil) or better: if(!connect) so due fact nil not same of null , probably code does't enter in if scope . you have been able discover breakpoint. anyway: be sure set trigger segue (line) 2 view controller , , name network_failure (that not best name. should instead view1toview2 ) as, m...
Read more

verilog - Systemverilog dynamic casting issues -

i've code snippet following in testbench function void write_to_port( my_data_type_base data ); my_data_type_extended data_ext; if(!$cast(data_ext, data)); `uvm_error(get_type_name(), "failed cast"); `uvm_info(get_name(), $psprintf("data_ext :\n%s", data_ext.sprint()), uvm_medium) // write data_ext out port.... endfunction when run it, i'm getting uvm_error "failed cast." i'm not quire sure why $cast not returning 1. can see, i'm printing out extended class data item after casting uvm_info. can see it's being cast properly. if don't use $cast if condition, don't runtime error. isn't coding practice use if dynamic cast check if $cast returning 1 ? what might reason behind cast not returning 1 in above case? i think semicolon on line 'if' not belong? i think consumes if statement, , uvm_error executes regardless of how if evaluates: if(!$cast(data_ext, data)); <- no semico...
Read more