c# - Does DataSet occupy too much space? -


if wish add information sql server database, must through dataset , dataadapter ?

the idea if database has 1-2 million entries, isn't memory going occupied unnecessary 1-2 mil rows in dataset considering want add 1 row? there alternative ?

you create plain old ado.net parametrized sqlcommand holding simple sql insert statement, , provide parameters, , load data way (nothing needs loaded, doesn't matter how many rows have - work):

string insertstmt = "insert dbo.yourtable(col1, col2, ...., coln) " +    "values(@value1, @value2, ...., @valuen)";  using(sqlconnection _con = new sqlconnection(-your-connection-string-here)) using(sqlcommand _cmdinsert = new sqlcommand(insertstmt, _con))     {    // define parameters query    _cmdinsert.parameters.add("@value1", sqldbtype.int);     .......     // set values    _cmdinsert.parameters["@value1"].value = 4711;    .....     _con.open();    int rowsinserted = _cmdinsert.executenonquery();    _con.close(); }

if have multiple rows insert, loop on e.g. list of objects, set values our _cmdinsert each object, , execute _cmdinsert.executenonquery() each row.

of course, if use orm (nhibernate, linq-to-sql, entity framework), work might infinitely easier - insert new objects collection , save them - orm deal nitty-gritty details (and code showed above , execute - more or less).


Comments

Post a Comment

Popular posts from this blog

asp.net - repeatedly call AddImageUrl(url) to assemble pdf document -

i'm using abcpdf , i'm curious if can recursively call addimageurl() function assemble pdf document compile multiple urls? something like: int pagecount = 0; int theid = thedoc.addimageurl("http://stackoverflow.com/search?q=abcpdf+footer+page+x+out+of+", true, 0, true); //assemble document while (thedoc.chainable(theid)) { thedoc.page = thedoc.addpage(); theid = thedoc.addimagetochain(theid); } pagecount = thedoc.pagecount; console.writeline("1 document page count:" + pagecount); //flatten document (int = 1; <= pagecount; i++) { thedoc.pagenumber = i; thedoc.flatten(); } //now try again theid = thedoc.addimageurl("http://stackoverflow.com/questions/1980890/pdf-report-generation", true, 0, true); //assemble document while (thedoc.chainable(theid)) { thedoc.page = thedoc.addpage(); theid = thedoc.addimagetoc...
Read more

java - Android recognize cell phone with keyboard or not? -

in android app, want detect user's device if device has keyboard(like motorola milestone) , show corresponding user interface. guys know how that? ! regards justicepenny http://developer.android.com/reference/android/content/res/configuration.html public int keyboard the kind of keyboard attached device. 1 of: keyboard_nokeys, keyboard_qwerty, keyboard_12key. that's it!
Read more

iphone - How would you achieve a LED Scrolling effect? -

how achieve led scrolling effect example below? led sign - led ticker emulator iphone , ipad http://img.skitch.com/20101201-rsfh4p1bajb1wp94k466pdpiuj.preview.jpg sometimes remunerates comment in other posts :) have put code you, should implement font '8pin matrix' realistic feeling. uilabel *label; - (void)viewdidload { [super viewdidload]; label = [[uilabel alloc]initwithframe:cgrectmake(10, 50, 300, 20)]; label.font = [uifont fontwithname:@"courier-bold" size:16.0]; label.backgroundcolor = [uicolor blackcolor]; label.textcolor = [uicolor greencolor]; label.linebreakmode = uilinebreakmodecharacterwrap; // otherwise "…" label.text = @"this led text scrolled "; // blanks space between [self.view addsubview:label]; [nstimer scheduledtimerwithtimeinterval:0.12f target:self selector:@selector(scrolllabel) use...
Read more