拷贝数据库文件到路径

NSFileManager *fileManager = [NSFileManager
defaultManager];

NSError *error;

//复制本地数据库文件到安装目录

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

NSString *documentDirectory = [paths
objectAtIndex:0];

//APP安装目录中的document目录路径

NSString *dbPath = [documentDirectory
stringByAppendingPathComponent:@"CountryDictionary.db"];

if ([fileManager fileExistsAtPath:dbPath]==NO) {

//项目中的数据库文件路径

NSString *resourcePath = [[NSBundle
mainBundle]pathForResource:@"CountryDictionary"
ofType:@"db"];

[fileManager
copyItemAtPath:resourcePath
toPath:dbPath error:&error];

}
else {

//更新APP Documnet目录的数据库文件，如果存在则先删除再复制最新的数据库文件过去。等本地数据库设计好后，下面的代码需要注释掉。

NSError *error;

if ([fileManager removeItemAtPath:dbPath
error:&error]!=YES) {

NSLog(@"unable to delete file %@",[error
localizedDescription]);

}

NSString*resourcePath =[[NSBundle
mainBundle] pathForResource:@"CountryDictionary"
ofType:@"db"];

[fileManager
copyItemAtPath:resourcePath
toPath:dbPath error:&error];

}