android - Odd Cursor Behavior -


i'm developing application uses database / contentprovider provide location data that's pulled network , stored locally in database periodically.

i've verified database created correctly in application, , tables populated data exporting copy of app local database sd card viewing in sql browser -- data not being present not issue here.

the odd behavior better visualized through couple of screen shots of debugging process:

so, when did queries, of cursor objects returning -1 row count, though verified select * table_name statement should return values, since database pulled off of device contains row data. here's @ debugger step:

enter image description here

notice when cursor returned, mcount displays -1.

out of curiosity, added cursor.movetofirst(); call, , here's screenshot after step:

enter image description here

notice cursor count changed -1 3, corresponds correct number of rows (since application accounts 3 continents atm). unfortunately, added line should unnecessary still doesn't fix problem, since cursoradapter.bindview() , cursoradapter.newview() still fail called resulting cursor.

i'm confused causing issue, , how fix it? if give insight problem be, please let me know. also, if additional code needed, such sql create statements, etc let me know - however, i've mentioned database created fine , queries performed on exported db copy outside of android application work fine...

one last thing, application built api levels 14+.

if have sql query reading database want delay reading data until use it.

so when call rawquery reference cursor object. nothing read yet. themovetofirst does. first thing tells cursor serious running sql query , want result.

but since using rawquery nothing passed on database before try fetch result movetofirst.

hope answers question.


Comments

Post a Comment

Popular posts from this blog

javascript - RequestAnimationFrame not working when exiting fullscreen switching space on Safari -

request animation frame stops working when exiting fullscreen clicking on original space's safari window. fine if fullscreen mode canceled escape key or calling cancelfullscreen(). steps reproduce: open https://dl.dropboxusercontent.com/u/769042/prezi/safari-fullscreen.html click "draw raf", kittie appears click "fullscreen", go fullscreen click "draw raf", kittie appears go space original safari was, showing "click exit fullscreen mode", click anywhere, out fullscreen click "draw raf", nothing happens what handling click calling: window.requestanimationframe(draw); which draws on canvas context: function draw() { ctx.drawimage(img, math.random()*500|0, math.random()*400|0, 100, 100); } i checked .hidden , .visibilitystate, updated correctly. tested on osx 10.9.3, safari 7.0.4 (9537.76.4). has workaround/solution other switching old settimeout? this sounds webkit bug 88940 : using reque
Read more

Python ctypes access violation with const pointer arguments -

i have api i'm trying wrap in python (2.7.6 on win7) code using ctypes. here's api: client_dllfunc bool clientapi search_exporttoclipcopy(clienthsearch handle, int channel, lpctstr filename, const time_t& from, const time_t& to, const bool* cameras, int length, bool usepassword, lpctstr password, bool includetextin = false, bool excludeplayer = false); the issue i'm having cameras argument; , i've had issue other const pointer arguments well. here's how i'm wrapping api: def search_exporttoclipcopy(self, hsearch, csearch, filename, tfrom, tto, cameras, length, usepassword, password, includetextin=true, excludeplayer=false): exporttoclipcopy = self.sdkdll.search_exporttoclipcopy exporttoclipcopy.argtypes = [c_int, c_int, c_wchar_p, c_long, c_long, pointer(c_bool), c_int, c_bool, c_wchar_p, c_bool, c_bool] exporttoclipcopy.restype = c_bool exporttoclipcopy(hsearch, csearch, filename, tfrom, tto, cameras, length, usepassword, pass
Read more