如何檢索tableview中的數據

我成功地將數據添加到我的tableview，但是在表視圖中它將檢索新數據，舊數據將不會被替換，並且在表視圖中它將檢索2個相同的我添加的數據。意思我會有「測試，測試，嗨」，當我輸入一個新的數據（再見，你好）我將有「測試，測試，嗨，測試，測試，嗨，再見，再見，你好」如何檢索tableview中的數據

if你需要額外的代碼告訴我，謝謝。

我的代碼：

 // ---Retrieve Rows--- 
    -(void) getAllRowsFromTableNamed: (NSString *) tableName { 
     [self openDB]; 
     NSString *qsql = @"SELECT * FROM Favourites"; 
     sqlite3_stmt *statement; 

     if (sqlite3_prepare_v2(db, [qsql UTF8String], -1, &statement, nil) == 
      SQLITE_OK) { 
      // Setup the SQL Statement and compile it for faster access 
      while (sqlite3_step(statement) == SQLITE_ROW) 
      { 

       // Read the data from the result row 
       char *field1 = (char *) sqlite3_column_text(statement, 0); 
       self.field1Str = [[NSString alloc] initWithUTF8String: field1]; 

       char *field2 = (char *) sqlite3_column_text(statement, 1); 
       self.field2Str = [[NSString alloc] initWithUTF8String: field2]; 


       NSString *stringValue = [[NSString alloc] initWithUTF8String: field1]; 
       [self.listArray addObject:stringValue]; 
       [stringValue release]; 

       NSLog(@"Address : %@ Description : %@", self.field1Str, self.field2Str); 

      } 
     } 
     // Release the compiled statement from memory 
     sqlite3_finalize(statement); 
     sqlite3_close(db); 
     NSLog(@"DATA RETRIEVED"); 
    } 
    //---End of Retrieve Row--- 



     - (NSInteger)tableView:(UITableView *)tableView 
     numberOfRowsInSection:(NSInteger)section 
     { 
      return [self.listData count]; 
     } 

     - (UITableViewCell *)tableView:(UITableView *)tableView 
       cellForRowAtIndexPath:(NSIndexPath *)indexPath 
     { 
      static NSString *TableIdentifier = @"TableIdentifier"; 
      UITableViewCell *cell = [tableView 
            dequeueReusableCellWithIdentifier:TableIdentifier]; 
      if (cell == nil) { 
       cell = [[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault 
               reuseIdentifier:TableIdentifier] autorelease]; 
      } 

      NSUInteger row = [indexPath row]; 
      cell.textLabel.text = [listData objectAtIndex:row]; 
      return cell; 

     } 

    - (void) viewWillAppear:(BOOL)animated { 
     [self getAllRowsFromTableNamed:@"Favourites"]; 

     NSArray *array = [[NSArray alloc] initWithObjects:self.field1Str, self.field2Str, nil]; 

     [self.listArray addObjectsFromArray:array]; 
     [array release]; 
     [favouriteListTableView reloadData]; 
     //NSLog(@"String1:%@, String2:%@", self.string1, self.string2); 
    } 
============================================================================================ 
-(void) insertRecordIntoTableNamed: (NSString *) tableName 
         withField1: (NSString *) field1 field1Value: (NSString *) field1Value 
         andField2: (NSString *) field2 field2Value: (NSString *) field2Value { 
    [self openDB]; 
    NSString *sql = [NSString stringWithFormat: 
        @"INSERT OR REPLACE INTO '%@' ('%@', '%@') VALUES ('%@','%@')", 
        tableName, field1, field2, field1Value, field2Value]; 

    char *err; 
    if (sqlite3_exec(db, [sql UTF8String], NULL, NULL, &err) != SQLITE_OK) 
    { 
     sqlite3_close(db); 
     NSAssert(0, @"Error updating table."); 

    } 
    NSLog(@"DATA RECORDED"); 

} 

-(IBAction)doneButton:(id)sender { 
    if([addressTextField.text isEqualToString:@""] || [descriptionTextField.text isEqualToString:@""]){ 
     UIAlertView *alert = [[UIAlertView alloc] 
           initWithTitle:@"Invalid Input!" 
           message:@"Please enter Address or Description" 
           delegate:self 
           cancelButtonTitle:@"OK" 
           otherButtonTitles:nil]; 
     [alert show]; 
     [alert release]; 
    } 
    else{ 
    [self insertRecordIntoTableNamed:@"Favourites" 
          withField1:@"address" field1Value:addressTextField.text 
          andField2:@"description" field2Value:descriptionTextField.text]; 

    NSArray *viewControllers = [self.navigationController viewControllers]; 

    FavouriteListViewController *favouriteListVC = (FavouriteListViewController *)[viewControllers objectAtIndex:viewControllers.count - 2]; 

    [favouriteListVC setString1:self.field1Str]; 
    [favouriteListVC setString2:self.field2Str]; 
    [self.navigationController popViewControllerAnimated:YES]; 
    } 
}

來源

2011-09-07 John2

首先檢查您從數據庫中獲取了多少數據並打開數據庫並檢查數據庫中存儲了多少數據？ –

如果我添加它將被添加到數據庫中並且數量是正確的，但它只在tableview中顯示2行。 – John2

正如SElanthiraiyan所說的，當你檢索它時，你必須在listdata數組中添加數據。 –

你必須從數據庫中檢索他們之後將數據添加到了listData陣列。

while (sqlite3_step(statement) == SQLITE_ROW) 
     { 
      // Read the data from the result row 
      char *field1 = (char *) sqlite3_column_text(statement, 0); 
      NSString *stringValue = [[NSString alloc] initWithUTF8String: field1]; 
      [self.listData addObject:stringValue]; 
      [stringValue release]; 

     }

您只獲取行，因爲在listData數組中只有兩個對象存在。

來源

2011-09-07 07:15:44 sElanthiraiyan

如何檢索tableview中的數據

回答

相關問題