Синхронизация базы данных sqlite с iCloud

Question

У меня есть база данных sqlite. теперь я хочу синхронизировать с icloud. Я читал блоги, говоря, что синхронизация sqlite с icloud не поддерживается. Либо отправляйте данные ядра, либо «Сделайте то, что именно делают данные ядра».

Теперь мне не представляется возможным использовать основные данные. Так же, как и второй вариант «Сделайте что-то похожее на то, как CoreData синхронизирует sqlite DBs: отправьте« транзакционные журналы »в iCloud и создайте каждый локальный файл sqlite. "

, пожалуйста, кто-нибудь может поделиться любым примером кода для «журнала транзакций» sqlite ИЛИ может expalin подробно поэтапно, что мне нужно делать?

Answer 1

1) Я перешел по этой ссылке для создания xml. Вы можете скачать соответствующий API из его github.Link является - http://arashpayan.com/blog/2009/01/14/apxml-nsxmldocument-substitute-for-iphoneipod-touch/

2) по нажатию кнопки:

-(IBAction) btniCloudPressed:(id)sender 
{ 
    // create the document with it’s root element 
    APDocument *doc = [[APDocument alloc] initWithRootElement:[APElement elementWithName:@"Properties"]]; 
    APElement *rootElement = [doc rootElement]; // retrieves same element we created the line above 

    NSMutableArray *addrList = [[NSMutableArray alloc] init]; 
    NSString *select_query; 
    const char *select_stmt; 
    sqlite3_stmt *compiled_stmt; 
    if (sqlite3_open([[app getDBPath] UTF8String], &dbconn) == SQLITE_OK) 
    { 
     select_query = [NSString stringWithFormat:@"SELECT * FROM Properties"]; 
     select_stmt = [select_query UTF8String]; 
     if(sqlite3_prepare_v2(dbconn, select_stmt, -1, &compiled_stmt, NULL) == SQLITE_OK) 
     { 
      while(sqlite3_step(compiled_stmt) == SQLITE_ROW) 
      { 
       NSString *addr = [NSString stringWithFormat:@"%@",[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiled_stmt,0)]]; 
       addr = [NSString stringWithFormat:@"%@#%@",addr,[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiled_stmt,1)]]; 
       addr = [NSString stringWithFormat:@"%@#%@",addr,[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiled_stmt,2)]]; 
       addr = [NSString stringWithFormat:@"%@#%@",addr,[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiled_stmt,3)]]; 
       addr = [NSString stringWithFormat:@"%@#%@",addr,[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiled_stmt,4)]]; 
       addr = [NSString stringWithFormat:@"%@#%@",addr,[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiled_stmt,5)]]; 
       addr = [NSString stringWithFormat:@"%@#%@",addr,[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiled_stmt,6)]]; 
       addr = [NSString stringWithFormat:@"%@#%@",addr,[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiled_stmt,7)]]; 

       //NSLog(@"%@",addr); 
       [addrList addObject:addr]; 
      } 
      sqlite3_finalize(compiled_stmt); 
     } 
     else 
     { 
      NSLog(@"Error while creating detail view statement. '%s'", sqlite3_errmsg(dbconn)); 
     } 

    } 

    for(int i =0 ; i < [addrList count]; i++) 
    { 
     NSArray *addr = [[NSArray alloc] initWithArray:[[addrList objectAtIndex:i] componentsSeparatedByString:@"#"]]; 

     APElement *property = [APElement elementWithName:@"Property"]; 
     [property addAttributeNamed:@"id" withValue:[addr objectAtIndex:0]]; 
     [property addAttributeNamed:@"street" withValue:[addr objectAtIndex:1]]; 
     [property addAttributeNamed:@"city" withValue:[addr objectAtIndex:2]]; 
     [property addAttributeNamed:@"state" withValue:[addr objectAtIndex:3]]; 
     [property addAttributeNamed:@"zip" withValue:[addr objectAtIndex:4]]; 
     [property addAttributeNamed:@"status" withValue:[addr objectAtIndex:5]]; 
     [property addAttributeNamed:@"lastupdated" withValue:[addr objectAtIndex:6]]; 
     [property addAttributeNamed:@"deleted" withValue:[addr objectAtIndex:7]]; 
     [rootElement addChild:property]; 
     [property release]; 

     APElement *fullscore = [APElement elementWithName:@"FullScoreReport"]; 
     [property addChild:fullscore]; 
     [fullscore release]; 
     select_query = [NSString stringWithFormat:@"SELECT AnsNo,Answer,AnswerScore,MaxScore,AnsIndex FROM FullScoreReport WHERE Addr_ID = %@",[addr objectAtIndex:0]]; 
     select_stmt = [select_query UTF8String]; 
     if(sqlite3_prepare_v2(dbconn, select_stmt, -1, &compiled_stmt, NULL) == SQLITE_OK) 
     { 
      while(sqlite3_step(compiled_stmt) == SQLITE_ROW) 
      { 
       APElement *answer = [APElement elementWithName:@"Answer"]; 
       [answer addAttributeNamed:@"AnsNo" withValue:[NSString stringWithFormat:@"%@",[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiled_stmt,0)]]]; 
       [answer addAttributeNamed:@"Answer" withValue:[NSString stringWithFormat:@"%@",[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiled_stmt,1)]]]; 
       [answer addAttributeNamed:@"AnswerScore" withValue:[NSString stringWithFormat:@"%@",[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiled_stmt,2)]]]; 
       [answer addAttributeNamed:@"MaxScore" withValue:[NSString stringWithFormat:@"%@",[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiled_stmt,3)]]]; 
       [answer addAttributeNamed:@"AnsIndex" withValue:[NSString stringWithFormat:@"%@",[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiled_stmt,4)]]]; 
       [fullscore addChild:answer]; 
       [answer release]; 
      } 
      sqlite3_finalize(compiled_stmt); 
     } 
    } 
    sqlite3_close(dbconn); 


    NSString *prettyXML = [doc prettyXML]; 
    NSLog(@"\n\n%@",prettyXML); 


    //***** PARSE XML FILE ***** 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *path = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"Properties.xml" ]; 
    NSData *file = [NSData dataWithBytes:[prettyXML UTF8String] length:strlen([prettyXML UTF8String])]; 
    [file writeToFile:path atomically:YES]; 


    NSString *fileName = [NSString stringWithFormat:@"Properties.xml"]; 
    NSURL *ubiq = [[NSFileManager defaultManager]URLForUbiquityContainerIdentifier:nil]; 
    NSURL *ubiquitousPackage = [[ubiq URLByAppendingPathComponent:@"Documents"] URLByAppendingPathComponent:fileName]; 


    MyDocument *mydoc = [[MyDocument alloc] initWithFileURL:ubiquitousPackage]; 
    mydoc.xmlContent = prettyXML; 
    [mydoc saveToURL:[mydoc fileURL]forSaveOperation:UIDocumentSaveForCreating completionHandler:^(BOOL success) 
    { 

     if (success) 
     { 
      NSLog(@"XML: Synced with icloud"); 
      UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"iCloud Syncing" message:@"Successfully synced with iCloud." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; 
      [alert show]; 
      [alert release]; 



     } 
     else 
      NSLog(@"XML: Syncing FAILED with icloud"); 


    }]; 

} 

3) MyDocument.h файл

#import <UIKit/UIKit.h> 

@interface MyDocument : UIDocument 
    @property (strong) NSString *xmlContent; 
@end 

4) MyDocument.m файл

#import "MyDocument.h" 

@implementation MyDocument 
@synthesize xmlContent,zipDataContent; 

// Called whenever the application reads data from the file system 
- (BOOL)loadFromContents:(id)contents ofType:(NSString *)typeName error:(NSError **)outError 
{ 
    // NSLog(@"* ---> typename: %@",typeName); 
       self.xmlContent = [[NSString alloc] 
           initWithBytes:[contents bytes] 
           length:[contents length] 
           encoding:NSUTF8StringEncoding]; 

    [[NSNotificationCenter defaultCenter] postNotificationName:@"noteModified" object:self]; 
    return YES;  
} 

// Called whenever the application (auto)saves the content of a note 
- (id)contentsForType:(NSString *)typeName error:(NSError **)outError 
{ 

     return [NSData dataWithBytes:[self.xmlContent UTF8String] length:[self.xmlContent length]]; 

} 

@end 

5) Теперь в Уре AppDelegate

- (void)loadData:(NSMetadataQuery *)queryData 
{ 


    for (NSMetadataItem *item in [queryData results]) 
    {  
     NSString *filename = [item valueForAttribute:NSMetadataItemDisplayNameKey]; 
     NSNumber *filesize = [item valueForAttribute:NSMetadataItemFSSizeKey]; 
     NSDate *updated = [item valueForAttribute:NSMetadataItemFSContentChangeDateKey]; 
     NSLog(@"%@ (%@ bytes, updated %@) ", filename, filesize, updated); 

     NSURL *url = [item valueForAttribute:NSMetadataItemURLKey]; 
     MyDocument *doc = [[MyDocument alloc] initWithFileURL:url]; 
     if([filename isEqualToString:@"Properties"]) 
     { 
      [doc openWithCompletionHandler:^(BOOL success) { 
       if (success) { 
        NSLog(@"XML: Success to open from iCloud"); 
        NSData *file = [NSData dataWithContentsOfURL:url]; 
        //NSString *xmlFile = [[NSString alloc] initWithData:file encoding:NSASCIIStringEncoding]; 
        //NSLog(@"%@",xmlFile); 

        NSXMLParser *parser = [[NSXMLParser alloc] initWithData:file]; 
        [parser setDelegate:self]; 
        [parser parse]; 
        //We hold here until the parser finishes execution 
        [parser release]; 
       } 
       else 
       { 
        NSLog(@"XML: failed to open from iCloud"); 
       } 
      }]; 
     } 
} 
} 

6) теперь в методе парсера извлекают данные и вставляют/обновляют по мере необходимости в базе данных.

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)nameSpaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict 
{ 
if ([elementName isEqual:@"Property"]) 
    { 
     NSLog(@"Property attributes : %@|%@|%@|%@|%@|%@|%@|%@", [attributeDict objectForKey:@"id"],[attributeDict objectForKey:@"street"], [attributeDict objectForKey:@"city"], [attributeDict objectForKey:@"state"],[attributeDict objectForKey:@"zip"],[attributeDict objectForKey:@"status"],[attributeDict objectForKey:@"lastupdated"],[attributeDict objectForKey:@"deleted"]); 
} 
//like this way fetch all data and insert in db 
}