iPhone sqlite3鎖定，只能讀取，不能寫入

所以我一直在這個項目上工作了一段時間。我從數據庫讀取數據並將其格式化爲UITableViews並沒有問題。但現在我也想寫入數據庫。問題是我不斷從sqlite中獲取「數據庫已鎖定」錯誤。在完成了原始版本之後，我通過實現我的數據庫處於捆綁狀態並因此不可寫，從而獲得了面部掌紋時刻。因此，我將數據庫重新定位到可以寫入的Apps Documents文件夾。但現在我仍然得到相同的「數據庫被鎖定」sql錯誤。我只在必要時打開和關閉數據庫。據我所知，我不會在任何地方打開它。以下是我想要更新的代碼。有什麼想法嗎？iPhone sqlite3鎖定，只能讀取，不能寫入

- (BOOL) loanBookTo:(NSString *)newborrower{ 
     NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
     NSString *documentsDirectory = [paths objectAtIndex:0]; 
     NSString *path = [documentsDirectory stringByAppendingPathComponent:@"books.sqlite"]; 

     if([[NSFileManager defaultManager] fileExistsAtPath:path]){ 
      NSLog(@"File Exists at: %@", path); 
     } 


     if (sqlite3_open([path UTF8String], &database) == SQLITE_OK) { 
      NSString *mySQL = @"UPDATE BOOKS SET LOANED = 1, BORROWER = \"<BORROWER>\" where ISBN = \"<ISBN>\""; 
      mySQL = [mySQL stringByReplacingOccurrencesOfString:@"<ISBN>" withString:self.isbn]; 
      mySQL = [mySQL stringByReplacingOccurrencesOfString:@"<BORROWER>" withString:newborrower]; 
      const char *sql = [mySQL UTF8String]; 
      char* errmsg; 
      sqlite3_exec(database, sql, NULL, NULL, &errmsg); 

      // Q. Database is locked. Why? 
      // A. Because it is in the Bundle and is ReadOnly. 
      // Need to write a copy to the Doc folder. 

      // Database is Locked error gets spit out here. 
      printf(errmsg); 
      sqlite3_close(database); 
     } 
     return NO; 
    }

來源

2009-10-31 mtwagner

數據庫在應用程序包或文檔目錄中位於何處？ – zaph 2009-10-31 15:27:50