sqlite步骤失败:尝试使用包装器写入只读数据库

在使用此代码复制数据库时,我不断收到错误“sqlite step failed:attest to write a readonly database”:

-(void)createEditableCopyOfDatabaseIfNeeded 
{
    // Testing for existence
    BOOL success;
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError *error;
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
                           NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *writableDBPath =
            [documentsDirectory stringByAppendingPathComponent:@"Money.sqlite"];

    success = [fileManager fileExistsAtPath:writableDBPath];
    if (success)
        return;

    // The writable database does not exist, so copy the default to
    // the appropriate location.
    NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath]
            stringByAppendingPathComponent:@"Money.sqlite"];
    success = [fileManager copyItemAtPath:defaultDBPath
                           toPath:writableDBPath
                           error:&error];
    if(!success)
    {
        NSAssert1(0,@"Failed to create writable database file with Message : '%@'.",
                 [error localizedDescription]);
    }
}

我在appdelegate中使用上述代码 而这个:

NSString *writableDBPath =
        [[NSBundle mainBundle] pathForResource:@"Money"
                               ofType:@"sqlite"];

在viewcontroller.m中

我在用 http://th30z.netsons.org/2008/11/objective-c-sqlite-wrapper/ 我做错什么了?

这是一次又一次…它以前工作得很好,但问题又开始了。