Question

我正在核心数据中进行测试并且有一个大约有的数组。我试图存储在我的数据库中的230条记录。不幸的是，只有最后一条记录似乎存储在数据库中。我只是无法弄清楚为什么我可以看到while循环正确循环？

此外，如果一个字段（nrField）被索引，我是否需要为其添加数字，或者这会在我向数据库添加记录时自动发生？ nrFields是存储在每条记录中的唯一计数器。

//=========LOOP ARRAY AND INSERT RECORDS INTO DB==============//
while (eOF != 99999) {

    qNr = [myArray objectAtIndex:xx];
    eOF = [qNr intValue];
    xx = xx++;

    if (eOF != 99999) {

        qDifficulties = [myArray objectAtIndex:xx];
        int iDiff = [qDifficulties intValue];
        [famQuizInfo setValue:[NSNumber numberWithInt:iDiff] forKey:@"qDiff"];
        xx = xx++;

        // No action for Category as it is not included in the database any longer
        xx = xx++;  // Calculate +1 to compensate for non existing Category

        [famQuizInfo setValue:[myArray objectAtIndex:xx] forKey:@"question"];
        xx = xx++;

        [famQuizInfo setValue:[myArray objectAtIndex:xx] forKey:@"qRightAnswer"];
        xx = xx++;

        [famQuizInfo setValue:[myArray objectAtIndex:xx] forKey:@"qWrongAnswer1"];
        xx = xx++;

        [famQuizInfo setValue:[myArray objectAtIndex:xx] forKey:@"qWrongAnswer2"];
        [famQuizInfo setValue:[NSNumber numberWithInt:0] forKey:@"qNrAccess"];
        [famQuizInfo setValue:[NSDate date] forKey:@"qRegDate"];


        //NSError *error;
        if (![qContext save:&error]) {
            NSLog(@"Whoops, couldn't save: %@", [error localizedDescription]);
        }

        xx = xx++;
        NSLog(@"xx: %i", xx);

    }
}

Answer 1

问题是您正在更新记录并在循环中覆盖它。每次循环时都需要创建一个famQuizInfo的新实例。

为什么只有最后一条记录存储在数据库中？

1 个答案: