problème dans la requête de sélection lors de l'extraction premier enregistrement de la base de données

Question

se bloque appliction quand je suis en train de sélectionner les données de base de données et leur est pas d'enregistrement

Erreur:

"Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** +[NSString stringWithUTF8String:]: NULL cString'". 

Requête: arrList = [app.sk lookupAllForSQL:@"select * from tblFriendDetail"];

Code pour la rechercheAllForSQL:

- (NSArray *)lookupAllForSQL:(NSString *)sql { 
     sqlite3_stmt *statement; 
     id result; 
     NSMutableArray *thisArray = [NSMutableArray arrayWithCapacity:4]; 
     if ((statement = [self prepare:sql])) { 
      while (sqlite3_step(statement) == SQLITE_ROW) { 
       NSMutableDictionary *thisDict = [NSMutableDictionary dictionaryWithCapacity:4]; 
       for (int i = 0 ; i < sqlite3_column_count(statement) ; i++) { 
        if (sqlite3_column_decltype(statement,i) != NULL && 
         strcasecmp(sqlite3_column_decltype(statement,i),"Boolean") == 0) { 
         result = [NSNumber numberWithBool:(BOOL)sqlite3_column_int(statement,i)]; 
        } else if (sqlite3_column_type(statement, i) == SQLITE_TEXT) { 
         result = [NSString stringWithUTF8String:(char *)sqlite3_column_text(statement,i)]; 
        } else if (sqlite3_column_type(statement,i) == SQLITE_INTEGER) { 
         result = [NSNumber numberWithInt:(int)sqlite3_column_int(statement,i)]; 
        } else if (sqlite3_column_type(statement,i) == SQLITE_FLOAT) { 
         result = [NSNumber numberWithFloat:(float)sqlite3_column_double(statement,i)];     
        } else { 
         result = [NSString stringWithUTF8String:(char *)sqlite3_column_text(statement,i)]; 
        } 
        if (result) { 
         [thisDict setObject:result 
            forKey:[NSString stringWithUTF8String:sqlite3_column_name(statement,i)]]; 
        } 
       } 
       [thisArray addObject:[NSDictionary dictionaryWithDictionary:thisDict]]; 
      } 
     } 
     sqlite3_finalize(statement); 
     return thisArray; 
    } 

Crash Log

#0 0x9599d176 in __kill() 
#1 0x9599d168 in kill$UNIX2003() 
#2 0x95a2f89d in raise() 
#3 0x95a459bc in abort() 
#4 0x93311fda in __gnu_cxx::__verbose_terminate_handler() 
#5 0x011a823b in _objc_terminate() 
#6 0x9331017a in __cxxabiv1::__terminate() 
#7 0x933101ba in std::terminate() 
#8 0x933102b8 in __cxa_throw() 
#9 0x011a8416 in objc_exception_throw() 
#10 0x0100cef8 in +[NSException raise:format:arguments:]() 
#11 0x0100ce6a in +[NSException raise:format:]() 
#12 0x00a06e35 in +[NSString stringWithUTF8String:]() 
#13 0x0000b6ab in -[SKDatabase lookupAllForSQL:] (self=0x59393e0, _cmd=0xf9ac, sql=0x13564) at SKDatabase.m:97 
#14 0x000052f9 in -[addGroupMembers viewWillAppear:] (self=0x4f2ce40, _cmd=0xe194, animated=1 '\001') at addGroupMembers.m:34 
#15 0x003649be in -[UINavigationController _startTransition:fromViewController:toViewController:]() 
#16 0x0035f32a in -[UINavigationController _startDeferredTransitionIfNeeded]() 
#17 0x00366562 in -[UINavigationController pushViewController:transition:forceImmediate:]() 
#18 0x0035f1c4 in -[UINavigationController pushViewController:animated:]() 
#19 0x00002d68 in -[GroupSelection editFriendListClicked:] (self=0x4f34da0, _cmd=0xdf58, sender=0x4f3a400) at GroupSelection.m:80 
#20 0x002a64fd in -[UIApplication sendAction:to:from:forEvent:]() 
#21 0x00336799 in -[UIControl sendAction:to:forEvent:]() 
#22 0x00338c2b in -[UIControl(Internal) _sendActionsForEvents:withEvent:]() 
#23 0x003377d8 in -[UIControl touchesEnded:withEvent:]() 
#24 0x002caded in -[UIWindow _sendTouchesForEvent:]() 
#25 0x002abc37 in -[UIApplication sendEvent:]() 
#26 0x002b0f2e in _UIApplicationHandleEvent() 
#27 0x012ff992 in PurpleEventCallback() 
#28 0x01035944 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__() 
#29 0x00f95cf7 in __CFRunLoopDoSource1() 
#30 0x00f92f83 in __CFRunLoopRun() 
#31 0x00f92840 in CFRunLoopRunSpecific() 
#32 0x00f92761 in CFRunLoopRunInMode() 
#33 0x012fe1c4 in GSEventRunModal() 
#34 0x012fe289 in GSEventRun() 
#35 0x002b4c93 in UIApplicationMain() 
#36 0x00002199 in main (argc=1, argv=0xbffff084) at main.m:14 

Answer 1

J'ai obtenu la solution. C'était parce qu'il obtenait une valeur nulle de la table sqlite. Donc, maintenant, quand je saisis des données, je fais attention à ce que j'entre les données pour tous les champs bien que les champs dans lesquels je n'ai pas d'entrée j'entre la chaîne vide dedans.