[英]Xcode download db from server
我正在創建一個使用數據庫顯示數據的應用程序,但當前該數據庫通過FMDB在本地讀取數據。 我想知道的是如何直接從服務器下載數據庫並將其顯示在表視圖中?
代碼段:-
-(void)viewWillAppear:(BOOL)animated{
NSString *path = [[NSBundle mainBundle] pathForResource:@"Climbing" ofType:@"db"];
FMDatabase *db = [FMDatabase databaseWithPath:path];
if (![db open]) {
NSLog(@"Error Opening DB");
return;
}
NSString *queryString;
CDData *regioni;
queryString = @"SELECT * , (SELECT count (*) FROM citta t WHERE t.id_regione = a.id_regione) as city FROM regione a ";
FMResultSet *s = [db executeQuery:queryString];
while ([s next]) {
regioni = [[CDData alloc] initWithRecordSet:s];
[self.data addObject:regioni];
}
[db close];
}
使用URL會話創建下載任務:
NSString *urlString = @"http://server_DB_URL_here";
NSURL *url = [NSURL URLWithString:urlString];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[[NSURLSession sharedSession] downloadTaskWithRequest:request];
一旦下載任務完成,然后使用委托實現將DB文件移到其位置:
- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask
didFinishDownloadingToURL:(NSURL *)location;
然后使用您發布的代碼從保存的路徑打開數據庫。
FMDatabase *db = [FMDatabase databaseWithPath:....
注意:我不會在viewWillAppear中完成上述所有操作:
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