asp.net mvc 3 - Complex SQL to LINQ in C# -


i'm newbie in linq , lamda expressions. have bit complex sql statement retrieves information several database tables:

select a.orderid, a.formjdeno, a.title, b.descr, c.code, c.descr, d.modificationdate orderform  left join orderpriority b on a.orderpriorityid = b.orderpriorityid  left join stockclass c on a.stockclassid = c.stockclassid  left join audittraillog d on a.orderid = d.objectid  d.columninfoid= 487 , d.oldvalue='1' , d.newvalue='2' , a.formstatus=2 , a.formtype=3 , b.orderpriorityid=1000001 , c.stockclassid=1000002 , a.deptid in      ( select deptid department instid = 1000006 ) , datediff(m,d.modificationdate, a.vendordeliverydate) >= 3

i have linq done, using .contains() method replacing where...in sql clause, need make de joins restricting results basing on values belongs other tables , using datediff equivalent in linq. have got , working fine, no restricting results above sql statement. tried several ways no success. need equivalent linq

update:

finally able working. final linq retrieves same records sql statement. many @gert arnold:

var valid = dba.orderform             .where(q => q.formtype == 3                         && q.formstatus == 2                         && q.orderpriority.orderpriorityid == orderpriorityid                         && q.stockclass.stockclassid == stockclassid                         && dba.audittraillog.where(log => q.orderid==log.objectid)                                 .any(log => log.columninfoid == 487                                             &&  log.oldvalue == "1"                                             && log.newvalue == "2"                                             && entityfunctions.diffmonths(log.modificationdate,                                                                       q.vendordeliverydate) >= period)                         && departments.contains(q.deptid));

i think it:

dba.orderform.where(q => q.formtype == 3      && q.formstatus == 2        && q.orderpriority.orderpriorityid == 1000001     && q.stockclass.stockclassid == 1000002     && q.audittraillogs         .any(log => log.columninfoid == 487                  && log.oldvalue == "1"                  && log.newvalue == "2"                  && entityfunctions.diffmonths(log.modificationdate,                                                   q.vendordeliverydate) >= 3)     && departments.contains(q.deptid));

i assume you've got (or can create) navigation property ordertable.audittraillogs.

without navigation property can use

&& dba.audittraillogs.where(log => q.orderid == log.objectid).any(...

Comments

Post a Comment

Popular posts from this blog

linux - xterm copying to CLIPBOARD using copy-selection causes automatic updating of CLIPBOARD upon mouse selection -

i've tried various ways coerce xterm (versions 285 , 292) copy selection clipboard clipboard whenever press ctrl-shift-c. promising way far has been, in ~/.xresources, put this: xterm*vt100.translations: #override \ ctrl shift <keypress> c: copy-selection(clipboard) \n\ ctrl shift <keypress> v: insert-selection(clipboard) ctrl-shift-v works perfectly, copying has nuance... if restart xterm, highlighting text puts things in primary clipboard; expected, proper, default behavior. if hit ctrl-shift-c, copies current selection clipboard clipboard. the bug, however, if highlight text after first time pressed ctrl-shift-c, you'll see highlighting copies both primary and clipboard. cannot figure out how stop xterm updating clipboard upon selection... , doesn't make sense me in first place. i said, @ specific point in time, copy selection clipboard... yet starts updating automatically upon selection after doing once... anyone have workaround...
Read more

c++ - qgraphicsview horizontal scrolling always has a vertical delta -

Image
i've subclassed qgraphicsview custom canvas used in cad application. i've reimplemented qgraphicsview::wheelevent check keyboard modifiers control key and, if control key pressed, zoom. i'm trying implement horizontal scroll when user holds shift , uses wheel. the problem i'm having horizontal scrolling always scrolls 0.279. not huge problem, hugely annoying , points else being wrong. so, here questions: is right way implement horizontal scrolling? if not, is? how eliminate delta of 0.279? thanks in advance. code , sample output below void myview::zoom(int delta) { double factor = pow(1.2, delta/abs(delta)); this->scale(factor, factor); } void myview::scrollhorizontal(int level) { qpointf center = maptoscene(viewport()->rect().center()); qdebug() << "center: " << center.x() << ", " << center.y(); centeron(qpointf(center.x() - level, center.y())); } void myview::wheelevent(qwheeleve...
Read more