Question

我在iOS应用程序中使用sqlite数据库，其名称为testSqlite.sqlite。我想将其复制到应用程序文件夹。但该文件未复制到所需位置。我还添加了我的源代码。请帮忙

 NSString *docsDir;
 NSArray *dirPaths;
dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = dirPaths [0];

NSString *backupPath = [[NSBundle mainBundle] pathForResource:@"testSqlite" ofType:@"sqlite"];
NSLog(@"backup is %@ ",backupPath);
if (![[NSFileManager defaultManager] fileExistsAtPath: docsDir]) {
    if (backupPath) {
        BOOL copiedBackup = [[NSFileManager defaultManager] copyItemAtPath:backupPath toPath:docsDir error:nil];
        if (!copiedBackup) {
            // copying backup db failed, bail
            NSLog(@"Copying backup db failed");
        }
        else
            NSLog(@"\n\ndatabase created");
    }
}

Answer 1

Apple建议使用网址，以下代码可在我的应用中使用：

NSString *docDirectory = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
NSString *filePath = [docDirectory stringByAppendingPathComponent:@"testSqlite.sqlite"];

NSURL *fileDocURL = [NSURL fileURLWithPath:[docDirectory stringByAppendingPathComponent:@"ProductInventory.plist"]];
NSURL *newFileURL = [NSURL fileURLWithPath:filePath];
NSLog(@"fileDocURL: %@, newFileURL: %@", fileDocURL, newFileURL);

NSError __autoreleasing *error;
BOOL success = [[NSFileManager defaultManager] copyItemAtURL:fileDocURL toURL:newFileURL error:&error];
if (success) {
        NSLog(@"Transaction file was copied");
        // Delete the old file
        [[NSFileManager defaultManager] removeItemAtURL:fileDocURL error:nil];
} else {
        NSLog(@"NO transaction file to copy, Error: %@", [error localizedDescription]);
}

Answer 2

尝试使用此代码将主程序包复制到运行时的文档目录文件夹。

  NSString *pathsToReources = [[NSBundle mainBundle] resourcePath];
    NSString *yourOriginalDatabasePath = [pathsToReources stringByAppendingPathComponent:@"lunchDB.sqlite"];

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

    NSString *documentsDirectory = [pathsToDocuments objectAtIndex: 0];

        NSString *dbPath = [documentsDirectory stringByAppendingPathComponent:@"lunchDB.sqlite"];

        if (![[NSFileManager defaultManager] isReadableFileAtPath: dbPath]) {

    if ([[NSFileManager defaultManager] copyItemAtPath: yourOriginalDatabasePath toPath: dbPath error: NULL] != YES)

    NSAssert2(0, @"Fail to copy database from %@ to %@", yourOriginalDatabasePath, dbPath);

    }

替换你的文件名＆＃34; lunchDB.sqlite＆＃34;这里。感谢。

如何在运行时将数据库从主包复制到应用程序文件夹？

2 个答案: