core data - CoreData Using Sqlite and Unicode Strings Fetch Not Working -

i have application storing japanese text in coredata sqlite database. populating data seems work ok (as far can tell), when search on string field returns no records. if search on 1 of integer fields does.

the string data unicode (ie, japanese characters), question core data not work unicode? seems unlikely. special have done search (fetch) work?

code populate data looks this:

wordprogress *newwordprogress = [nsentitydescription insertnewobjectforentityforname:@"wordprogress" inmanagedobjectcontext:progresscontext]; newwordprogress.kanji = kanji; newwordprogress.kanji = kana; newwordprogress.senseindex = [nsnumber numberwithint:senseindex]; newwordprogress.skilltype = [nsnumber numberwithint:skilltype];  newwordprogress.leitnerdeck = leitnerdeck; newwordprogress.datelastshown = lastshowndate; 

code test fetch, looks this:

nspredicate *pred = [nspredicate predicatewithformat:@"kanji = %@", @"彼"]; nsfetchrequest *testrequest = [[nsfetchrequest alloc] init]; [testrequest setpredicate:pred]; [testrequest setentity:[nsentitydescription entityforname:@"wordprogress" inmanagedobjectcontext:progresscontext]]; nsarray *results = [progresscontext executefetchrequest:testrequest error:&error]; 

but returns no records, when know records populated.

just tried too, , seems fail. i'm sure must doing fundamentally wrong:

wordprogress *newwordprogress = [nsentitydescription insertnewobjectforentityforname:@"wordprogress" inmanagedobjectcontext:progresscontext]; newwordprogress.kanji = @"彼"; newwordprogress.kanji = kana; newwordprogress.senseindex = [nsnumber numberwithint:senseindex]; newwordprogress.skilltype = [nsnumber numberwithint:skilltype];  newwordprogress.leitnerdeck = leitnerdeck; newwordprogress.datelastshown = lastshowndate;  nspredicate *pred = [nspredicate predicatewithformat:@"kanji = %@", @"彼"]; nsfetchrequest *testrequest = [[nsfetchrequest alloc] init]; [testrequest setpredicate:pred]; [testrequest setentity:[nsentitydescription entityforname:@"wordprogress" inmanagedobjectcontext:progresscontext]]; nsarray *results = [progresscontext executefetchrequest:testrequest error:&error]; 

it's not unicode problem, it's nspredicate error affect string. have:

nspredicate *pred = [nspredicate predicatewithformat:@"kanji = '%@'", @"彼"]; 

the single quotes in there problem. you're creating predicate looks literal %@ in data. single quotes prevent substituting @"彼" %@. take single quotes out , should work expected:

nspredicate *pred = [nspredicate predicatewithformat:@"kanji = %@", @"彼"];