如何在iOS中启动应用程序时复制sqlite数据库？ [英] How to copy sqlite database when application is launched in iOS?

问题描述

我每次启动应用程序时，都要将我的sqlite数据库从数据库位置复制到我的iOS应用程序的最新更新。

I want to copy my sqlite database from the database location with latest updates to my iOS application every time I launch the application.

有什么办法吗？

推荐答案

添加以下方法到您的appdelegate

you can add following methods to your 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"];
}

并在启动方法中调用此方法
[self copyDatabaseIfNeeded]; 希望这将有所帮助。

and call this method in your did finish with launching method [self copyDatabaseIfNeeded]; hope this will help.

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