更新应用程序时移动ios sqlite数据库

更新应用程序时移动ios sqlite数据库,ios,sqlite,core-data,nsfilemanager,Ios,Sqlite,Core Data,Nsfilemanager,我正在我的应用程序中使用核心数据,我想在下一次更新中启动iTunes文件共享,但需要先移动我的应用程序sqlite数据库。我尝试了下面的代码,但应用程序在启动时崩溃。我想我可以在NSPersistentStoreCoordinator中用一个新的存储url替换旧的存储url,其中“newDatabasePath”匹配新的存储url 然后将sqlite文件替换为 - (BOOL)application:(UIApplication *)application didFinishLaunchingW

我正在我的应用程序中使用核心数据,我想在下一次更新中启动iTunes文件共享,但需要先移动我的应用程序sqlite数据库。我尝试了下面的代码,但应用程序在启动时崩溃。我想我可以在NSPersistentStoreCoordinator中用一个新的存储url替换旧的存储url,其中“newDatabasePath”匹配新的存储url

然后将sqlite文件替换为

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

//check app has run before and has a current db
if ([saveData boolForKey:@"hasRunBefore"]) {
NSString *oldDatabasePath = [[dirPaths objectAtIndex:0] stringByAppendingPathComponent:@"AppData.sqlite"];
        NSString *newDatabasePath = [privateDocsPath stringByAppendingPathComponent:@"AppData.sqlite"];
        NSError *error;
        if ([fileMgr fileExistsAtPath:newDatabasePath]) {

            [fileMgr removeItemAtPath:newDatabasePath error:&error];
            [fileMgr copyItemAtPath:oldDatabasePath toPath:newDatabasePath  error:&error];
        }

        [fileMgr removeItemAtPath:oldDatabasePath error:&error];

        BOOL databaseMoved = YES;
        [saveData setBool:databaseMoved forKey:@"databaseMoved"];
}
}
谢谢

在阅读了这里的一个类似问题后,我尝试了一种新的方法来解决这个问题,并取得了一些成功。我试着像这样重置coredata堆栈

- (void)resetDatabase {

NSPersistentStore* store = [[__persistentStoreCoordinator persistentStores] lastObject];

NSError *error = nil;
NSURL *storeURL = store.URL;

// release context and model
__managedObjectModel = nil;
__managedObjectContext = nil;

//[__persistentStoreCoordinator removePersistentStore:store error:nil];

__persistentStoreCoordinator = nil;

NSFileManager* fileMgr = [NSFileManager defaultManager];
[fileMgr removeItemAtPath:storeURL.path error:&error];
if (error) {
    NSLog(@"filemanager error %@", error);
}

NSArray *dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

//create Private Documents Folder
NSArray *libPaths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
NSString *libDir = [libPaths objectAtIndex:0];
NSString *privateDocsPath = [libDir stringByAppendingPathComponent:@"Private Documents"];
if (![fileMgr fileExistsAtPath:privateDocsPath])
    [fileMgr createDirectoryAtPath:privateDocsPath withIntermediateDirectories:YES attributes:nil error:nil];


NSString *oldDatabasePath = [[dirPaths objectAtIndex:0] stringByAppendingPathComponent:@"AppData.sqlite"];
NSString *newDatabasePath = [privateDocsPath stringByAppendingPathComponent:@"AppData.sqlite"];

BOOL removedItemAtPath = NO;
BOOL copiedItemToPath = NO;

if ([fileMgr fileExistsAtPath:newDatabasePath]) {
    DLog(@"DATABASE EXISTS AT PATH");
    removedItemAtPath = [fileMgr removeItemAtPath:newDatabasePath error:&error];
    if (removedItemAtPath) {
        DLog(@"ITEM REMOVED");
    }
    else
        DLog(@"FAILED TO REMOVE ITEM: %@", error);

    copiedItemToPath = [fileMgr copyItemAtPath:oldDatabasePath toPath:newDatabasePath  error:&error];
    if (copiedItemToPath) {
        DLog(@"ITEM COPIED");
    }
    else
        DLog(@"FAILED TO COPY ITEM: %@", error);
}

// recreate the stack
__managedObjectContext = [self managedObjectContext];

}

使用这种方法,当我第一次启动coredata堆栈时,应用程序在尝试从该堆栈加载数据时仍会引发异常,但随后会重新加载一切正常,并使用“Library/Private Documents”中新位置的sqlite文件,因为您说错误消息是:

*** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array' *** First throw call stack:
手指非常有力地指向这条线:

NSString *oldDatabasePath = [[dirPaths objectAtIndex:0] stringByAppendingPathComponent:@"AppData.sqlite"];

错误消息也会告诉您原因——您正在空数组上使用索引0。因此,
dirpath
为空。我不知道为什么,因为您没有将代码发布到指定值的位置,但这就是导致此崩溃的原因。

答案与通常的答案一样简单

我只是移动了将应用程序复制到原始数据库中所需的代码 -(NSPersistentStoreCoordinator*)在添加存储之前,而不是尝试从 -(BOOL)应用程序:(UIApplication*)应用程序使用选项完成启动:(NSDictionary*)启动选项

又浪费了一天

- (NSPersistentStoreCoordinator *)persistentStoreCoordinator
{

if (__persistentStoreCoordinator != nil)
{
    return __persistentStoreCoordinator;
}

//test if app already run before, copy database over and remove old one, finally switch store url to new directory
if ([saveData boolForKey:@"hasRunBefore"]) {

    if ([saveData boolForKey:@"databaseUpdated"] != YES) {

        DLog(@"MOVING DATABASE");
        NSFileManager* fileMgr = [[NSFileManager alloc] init];
        fileMgr.delegate = self;
        NSArray *dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *docsDir = [dirPaths objectAtIndex:0];
        //create Private Documents Folder
        NSArray *libPaths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
        NSString *libDir = [libPaths objectAtIndex:0];
        NSString *privateDocsPath = [libDir stringByAppendingPathComponent:@"Private Documents"];
        if (![fileMgr fileExistsAtPath:privateDocsPath])
            [fileMgr createDirectoryAtPath:privateDocsPath withIntermediateDirectories:YES attributes:nil error:nil];

        NSString *oldDatabasePath = [docsDir stringByAppendingPathComponent:@"AppData.sqlite"];
        NSString *newDatabasePath = [privateDocsPath stringByAppendingPathComponent:@"AppData.sqlite"];
        NSError *error;
        //BOOL removedItemAtPath = NO;
        BOOL copiedItemToPath = NO;

        copiedItemToPath = [fileMgr copyItemAtPath:oldDatabasePath toPath:newDatabasePath  error:&error];
        if (copiedItemToPath) {
            DLog(@"ITEM COPIED");
        }
        else
            DLog(@"FAILED TO COPY ITEM: %@", error);

        [fileMgr removeItemAtPath:oldDatabasePath error:&error];

        [saveData setBool:YES forKey:@"databaseUpdated"];
        [saveData synchronize];

    }

}


//NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"AppData.sqlite"];
NSURL *storeURL = [[self applicationHiddenDocumentsDirectory] URLByAppendingPathComponent:@"AppData.sqlite"];

NSError *error = nil;
__persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
if (![__persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error])
{
    DLog(@"Unresolved error %@, %@", error, [error userInfo]);
    abort();
}    

return __persistentStoreCoordinator;
}

我也遇到了同样的问题,找到了一个非常简单的解决方案。基本上,在初始化NSPersistentStoreCoordinator之前,如在
-(BOOL)应用程序的顶部:(UIApplication*)应用程序使用选项完成启动:(NSDictionary*)启动选项之前,请将数据库文件从其当前位置移到新位置。如果新位置尚不存在,请确保创建新位置。在下面的示例代码中,我使用了库/应用程序支持目录下的数据库子目录。我没有显示“数据库”目录的创建;但是,这也必须在移动文件之前发生。确保存储初始化使用新位置。


NSURL*storeURL=[NSURL fileURLWithPath:[self-getFullPrivatePath:@”“];


这里有一些代码可以帮助您明确这一点。我还包括了我的助手方法,因此对于这些方法来自何处或如何工作没有任何混淆。请注意,有3个数据库文件必须移动,这就是为什么存在循环的原因。它们是[数据库文件名][数据库文件名]-wal[数据库文件名]-shm

- (void)convertPublicFilesToPrivate
{
    NSFileManager *fileManager = [NSFileManager defaultManager];

    // Move the database files
    NSArray<NSString *> *dbFiles = [self filesByPrefix:@"<database file name>" isPublic: YES];
    for (NSString *dbFile in dbFiles) {
        NSString *fileName = [dbFile lastPathComponent];
        NSError *error;
        NSString *privatePath = [self getFullPrivatePath:fileName];
        [fileManager moveItemAtPath: dbFile toPath: privatePath error:&error];
        NSLog(@"Move database file %@ returned %@", fileName, error);
    }
}

-(NSString *)getPublicPath
{
    return NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
}

- (NSString *)getPrivatePath
{
    return [NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory, NSUserDomainMask, YES)[0] stringByAppendingPathComponent:@"Database"];
}

-(NSString*)getFullPublicPath:(NSString *)fileName
{
    NSString *documentsDirectory = [self getPublicPath];
    if (fileName != nil) {
        return [documentsDirectory stringByAppendingPathComponent:fileName];
    } else {
        return documentsDirectory;
    }
}

-(NSString*)getFullPrivatePath:(NSString *)fileName
{
    NSString *documentsDirectory = [self getPrivatePath];
    if (fileName != nil) {
        return [documentsDirectory stringByAppendingPathComponent:fileName];
    } else {
        return documentsDirectory;
    }
}

- (NSArray*)filesByPrefix:(NSString*)prefix isPublic:(BOOL)isPublic
{
    NSString *documentsDirectory = isPublic ? [self getPublicPath] : [self getPrivatePath];
    NSArray<NSString *> *directoryContent = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:documentsDirectory error:NULL];
    NSMutableArray *fileList = [[NSMutableArray alloc] initWithCapacity:1];
    for (NSString *fileName in directoryContent) {
        if (prefix.length == 0 || [fileName hasPrefix:prefix]) {
            [fileList addObject:[documentsDirectory stringByAppendingPathComponent:fileName]];
        }
    }
    return fileList;
}
-(void)convertPublicFilesToPrivate
{
NSFileManager*fileManager=[NSFileManager defaultManager];
//移动数据库文件
NSArray*dbFiles=[self filesByPrefix:@“isPublic:YES];
for(数据库文件中的NSString*dbFile){
NSString*fileName=[dbFile lastPathComponent];
n错误*错误;
NSString*privatePath=[self-getFullPrivatePath:fileName];
[fileManager moveItemAtPath:dbFile-toPath:privatePath错误:&错误];
NSLog(@“移动数据库文件%@返回%@”,文件名,错误);
}
}
-(NSString*)getPublicPath
{
返回NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES)[0];
}
-(NSString*)getPrivatePath
{
返回[NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory,NSUserDomainMask,YES)[0]stringByAppendingPathComponent:@“Database”];
}
-(NSString*)getFullPublicPath:(NSString*)文件名
{
NSString*documentsDirectory=[self-getPublicPath];
如果(文件名!=nil){
返回[DocumentsDirectoryStringByAppendingPathComponent:fileName];
}否则{
返回文件目录;
}
}
-(NSString*)getFullPrivatePath:(NSString*)文件名
{
NSString*documentsDirectory=[self-getPrivatePath];
如果(文件名!=nil){
返回[DocumentsDirectoryStringByAppendingPathComponent:fileName];
}否则{
返回文件目录;
}
}
-(NSArray*)filesByPrefix:(NSString*)前缀isPublic:(BOOL)isPublic
{
NSString*documentsDirectory=isPublic?[self-getPublicPath]:[self-getPrivatePath];
NSArray*directoryContent=[[NSFileManager defaultManager]目录目录路径:文档目录错误:NULL];
NSMutableArray*文件列表=[[NSMutableArray alloc]initWithCapacity:1];
for(directoryContent中的NSString*文件名){
if(prefix.length==0 | |[文件名hasPrefix:前缀]){
[fileList addObject:[documentsDirectory stringByAppendingPathComponent:fileName];
}
}
返回文件列表;
}

Crashlog对回答您的问题真的很有帮助吗?崩溃日志不是很有帮助,只是说我的应用程序无法加载它所需的数据,我知道这些数据,否则它不会崩溃***由于未捕获的异常“NSRangeException”,终止应用程序,原因:'***-[\u NSArrayM objectAtIndex:]:索引0超出空数组“***第一次抛出调用堆栈”的界限:嗨,汤姆,不确定是否发生了这种情况。当根视图控制器试图通过NSFetchRequest加载其原始coredata时发生抛出。据我所知,当我更改NSPersistentStoreCoordinatorsStoreURL时,它会在空目录中创建一个新的sqlite数据库。然后,我想删除该sqlite数据库,并在应用程序更新之前将其复制到原始sqlite数据库上,然后复制到此新目录。我已经调试了删除和复制操作,它们也按照我的要求进行。然后你应该在问题中发布更多信息,因为有了可用的详细信息,没有其他合理的结论。尝试设置一个异常断点,它将告诉您导致崩溃的代码行。
- (void)convertPublicFilesToPrivate
{
    NSFileManager *fileManager = [NSFileManager defaultManager];

    // Move the database files
    NSArray<NSString *> *dbFiles = [self filesByPrefix:@"<database file name>" isPublic: YES];
    for (NSString *dbFile in dbFiles) {
        NSString *fileName = [dbFile lastPathComponent];
        NSError *error;
        NSString *privatePath = [self getFullPrivatePath:fileName];
        [fileManager moveItemAtPath: dbFile toPath: privatePath error:&error];
        NSLog(@"Move database file %@ returned %@", fileName, error);
    }
}

-(NSString *)getPublicPath
{
    return NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
}

- (NSString *)getPrivatePath
{
    return [NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory, NSUserDomainMask, YES)[0] stringByAppendingPathComponent:@"Database"];
}

-(NSString*)getFullPublicPath:(NSString *)fileName
{
    NSString *documentsDirectory = [self getPublicPath];
    if (fileName != nil) {
        return [documentsDirectory stringByAppendingPathComponent:fileName];
    } else {
        return documentsDirectory;
    }
}

-(NSString*)getFullPrivatePath:(NSString *)fileName
{
    NSString *documentsDirectory = [self getPrivatePath];
    if (fileName != nil) {
        return [documentsDirectory stringByAppendingPathComponent:fileName];
    } else {
        return documentsDirectory;
    }
}

- (NSArray*)filesByPrefix:(NSString*)prefix isPublic:(BOOL)isPublic
{
    NSString *documentsDirectory = isPublic ? [self getPublicPath] : [self getPrivatePath];
    NSArray<NSString *> *directoryContent = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:documentsDirectory error:NULL];
    NSMutableArray *fileList = [[NSMutableArray alloc] initWithCapacity:1];
    for (NSString *fileName in directoryContent) {
        if (prefix.length == 0 || [fileName hasPrefix:prefix]) {
            [fileList addObject:[documentsDirectory stringByAppendingPathComponent:fileName]];
        }
    }
    return fileList;
}