c# - How to execute the following SQL-Query using LINQ or HQL -


how can execute following query using castle activerecords , linq or hql?

select a.id, s.classes, count(p.id), max(p.date) last, min(p.date) first
account a
left join school s on s.account_id = a.id
left join user u on u.account_id = a.id
left join points p on p.user_id = u.id
payment = "s"
group a.id

the tables related in following way: er-diagramm

i have activerecord classes tables correct relations defined (if query in steps works, slow there lot of rows) , tried following didn't worked:

var result = account in accountrecord.queryable              join s in schoolrecord.queryable on account equals s.account schools              school in schools.defaultifempty(null)              join user in userrecord.queryable on account equals user.account              join p in pointsrecord.queryable on user equals p.user points              account.paymenttype == "s"              select new { account = account, school = school, count = points.count() };

which threw following the method or operation not implemented-exception at:

nhibernate.linq.visitors.querymodelvisitor.visitgroupjoinclause(groupjoinclause groupjoinclause, querymodel querymodel, int32 index)

found solution using hql - i'm still open linq solution:

hqlbasedquery query = new hqlbasedquery(typeof(accountrecord),     "select a, s, count(p), min(p.dateutc), max(p.dateutc) " +     "from accountrecord " +     "left join a.schools s " +     "left join a.users u " +     "left join u.points p " +     "where a.paymenttype=:payment group a.id"); query.setparameter("payment", "s"); var result = object[] row in (arraylist)activerecordmediator.executequery(query)                 select new                 {                     account = row[0] accountrecord,                     school = row[1] schoolrecord,                     count = row[2],                     first = (new datetime(1970, 1, 1, 0, 0, 0, 0)).addseconds(convert.todouble(row[3])),                     last = (new datetime(1970, 1, 1, 0, 0, 0, 0)).addseconds(convert.todouble(row[4]))                 };

Comments

Post a Comment

Popular posts from this blog

c++ - Is it possible to compile a VST on linux? -

for class project i'm attempting write vst plugin backed cuda. current cuda workflow on linux box, i'd prefer compile , link there. according wikipedia , should possible (i couldn't find steinberg documentation relevant linux) can't find makefile or instructions on how build if aren't using xcode or visual studio. i'm vst 3 sdk doesn't support linux. when try compile plugin under linux, error: ./base/source/fatomic.cpp:39:30: fatal error: libkern/osatomic.h: no such file or directory this issue caused following code in "vst3 sdk/base/source/fatomic.cpp" #if mac #include <libkern/osatomic.h> #if mac_os_x_version_min_required > mac_os_x_version_10_4 #define native_atomic_type (volatile int32_t*) #else #define native_atomic_type (int32_t*) #endif #elif windows #include <windows.h> #endif but hope compiling under linux work vst sdk 2.4. reading. jvstwrapper seems run on lin...
Read more

java - Output of Eclipse is rubbish -

i want write program in eclipse language different english. when display output using system.out program, displays output correctly in console editor. when accept input console , output it, output rubbish. how can solve it. many thnaks i'm not sure if problem, have character encoding problem. make sure you're using unicode, utf-8. you can read more @ official docs converting non-unicode text .
Read more

jquery - Confused with JSON data and normal data in Django ajax request -

i read json internet still have not got grasp of it. reading article http://webcloud.se/log/ajax-in-django-with-jquery/ i not understood first part function using json def xhr_test(request, format): if request.is_ajax(): if format == 'xml': mimetype = 'application/xml' if format == 'json': mimetype = 'application/javascript' data = serializers.serialize(format, examplemodel.objects.all()) return httpresponse(data,mimetype) # if want prevent non xhr calls else: return httpresponse(status=400) my main problems are from function getting format variable does format json mean data given function json or data recived json can give me simple example ouput of function data = serializers.serialize(format, examplemodel.objects.all()) how use data when response in jquery function if don't use json in above function how input , response chnage thanks ...
Read more