将 sqlite 数据库与 iCloud 同步
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【中文标题】将 sqlite 数据库与 iCloud 同步【英文标题】：Syncing sqlite database with iCloud 【发布时间】：2012-03-31 05:42:35 【问题描述】：我有我的 sqlite 数据库。现在我想与 icloud 同步。我读过博客说不支持与 icloud 同步的 sqlite。要么选择核心数据，要么“做核心数据所做的事情”。
现在我不可能去获取核心数据。所以就像第二个选项“做一些类似于 CoreData 如何同步 sqlite DBs 的事情：将“事务日志”发送到 iCloud 并从中构建每个本地 sqlite 文件。”
请任何人都可以分享sqlite的“事务日志”的任何示例代码，或者可以逐步详细说明我需要做什么？
【问题讨论】：
你能告诉我我们每次都必须创建 XML 吗？或仅使用该 XML 中的更改进行更新？如果只是改变那么请让我知道如何？或者如果创建 XML 那么我认为这将是耗时的操作.. 请建议.. 如果您足够灵活，可以对现有 XML 进行更改，那就太好了。当然，您可以修改现有的。 :) 无需每次都创建 你能告诉我如何对现有的进行更改吗？ 我没有对现有的进行任何更改。但我想你需要解决这个问题。就我而言，我每次都在创建 XML，因为需要进行批量更改。如果您有键对值类型数据，那么您也可以使用 plist 文件。 @βhargavḯ 我在您的一个问题中读到您想在您的一个应用程序中使用信用卡。我也需要你的帮助。你完成那个任务了吗？是的，那么……苹果批准了吗？ 【参考方案1】：1) 我按照这个链接创建了 xml。你可以从它的github下载相应的api。链接是-http://arashpayan.com/blog/2009/01/14/apxml-nsxmldocument-substitute-for-iphoneipod-touch/
2) 按钮点击：
-(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 文件
#import <UIKit/UIKit.h>
@interface MyDocument : UIDocument
@property (strong) NSString *xmlContent;
@end
4)MyDocument.m 文件
#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) 现在在你的应用程序中
- (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) 现在在解析器方法中获取数据并根据需要在数据库中插入/更新。
- (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
【讨论】：
感谢您的回答。我只是想问一下我可以在 iCloud 上发送图片吗。 是的，我也为图片做过（比如图片文件夹）。我在这个链接上回答了同样的问题***.com/questions/8047217/… 我集成了上面的代码，它现在运行良好，但我想问如果我在我的条目中更改了一些东西，它是如何管理的。 请您详细说明您的陈述好吗？基本上数据库中的条目是在您的最后管理的。现在您只需创建现有更改数据库的 xml 并将其发送到云端。 @Bhargavi 在这里您发送 sqlite 并再次发送文件夹，通过将其转换为 zipfile sp 为什么您不能通过获取路径将 sqlite 放入项目中的文件夹中以同样的方式发送 sqlite ?以上是关于将 sqlite 数据库与 iCloud 同步的主要内容，如果未能解决你的问题，请参考以下文章