Question

我在php中运行此代码，如果我尝试分别运行每个while循环，但是当我尝试执行嵌套whileloop时它会产生错误

List<List<Integer>> data = Arrays.asList(
    Arrays.asList(1,2), 
    Arrays.asList(3,4,5), 
    Arrays.asList(6,7));

data.stream()
    .flatMap(List::stream)
    .peek(System.out::println)
    .allMatch(x -> x < 4);

这是Php代码

Fatal error: Uncaught PDOException: SQLSTATE[IMSSP]: There are no more rows in the active result set. Since this result set is not scrollable, no more data may be retrieved. in C:\xampp\htdocs\survey-module\survey.php:13 Stack trace: #0 C:\xampp\htdocs\survey-module\survey.php(13): PDOStatement->fetch() #1 {main} thrown in

Answer 1

显然MSSQL不允许在嵌套的同时进行多次抓取，所以我所做的是获取数据并将其放在关联数组中，这是代码。

$question_array = array();
while ($question = $questions->fetch()) {
    $question_push = array('header'=>$question['header'],'question'=>$question['question']);
    array_push($question_array,$question_push);
}
while ($question_validation =$header_questions->fetch()) {
    foreach ($question_array as $key => $value) {
        if($question_validation['header']==$value['header'])
        {
            echo $value['header'] ."-". $value['question'] ."<br>";
        }
    }
}

Answer 2

您可以尝试获取数据并将其与null进行比较，因为我发现在获取最后一行时，下一行变为null，然后获取下一行将引发异常There are no more rows in the active result set。

这很奇怪，不应该起作用-在尝试获取不存在的行时，我希望获得false的值。

尽管如此-它可行，我不会抱怨;）

 $survey_detail=$survey->viewSurvey('3');
        $questions=$survey->indexQuestion('3');

        while (($question_header = $header_questions->fetch()) !== null){
            while (($question_detail = $questions->fetch()) !== null){
                if($question_detail['header']==$question_header['header']){
                echo $question_detail['header'] . "-".$question_detail['question']. "<br>";
                }
            }
        }

PHP MSSQL在活动结果中没有更多行

2 个答案: