在iOS中启动应用程序时如何复制sqlite数据库？

每当我启动应用程序时,我想将数据库中的sqlite数据库从最新更新复制到我的iOS应用程序.

有什么办法吗？

解决方法

你可以添加以下方法给你的appdelegate

- (void) copyDatabaseIfNeeded {

    //Using NSFileManager we can perform many file system operations.
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError *error;

    NSString *dbPath = [self getDBPath];
    BOOL success = [fileManager fileExistsAtPath:dbPath];

    if(!success) {

       NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"database.sqlite"];
       success = [fileManager copyItemAtPath:defaultDBPath toPath:dbPath error:&error];

       if (!success)
          NSAssert1(0,@"Failed to create writable database file with message '%@'.",[error localizedDescription]);
    }
}

- (NSString *) getDBPath
{   
    //Search for standard documents using NSSearchPathForDirectoriesInDomains
    //First Param = Searching the documents directory
    //Second Param = Searching the Users directory and not the System
    //Expand any tildes and identify home directories.

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
    NSString *documentsDir = [paths objectAtIndex:0];
    //NSLog(@"dbpath : %@",documentsDir);
    return [documentsDir stringByAppendingPathComponent:@"database.sqlite"];
}

并在你的完成后用调用方法调用这个方法[self copyDatabaseIfNeeded];希望这将有所帮助.