它没有在回答db表中插入questionid

时间:2013-01-07 11:08:51

标签: php mysql sql mysqli

我无法将QuestionId插入Answer表格。

Question插入没有问题,但我试图从QuestionId表中检索Question,这是Answer表中的自动增量特定SessionId所属的QuestionNoQuestionId。相反,当插入0表时,它会QuestionId显示Answer

现在我知道尝试从QuestionId表中为每个Question执行选择的查询是正确的,因为已经过测试。我认为问题出在我放置代码但我不确定的地方?

以下是db表:

问题表

QuestionId (auto)  SessionId  QuestionNo
4                  2          1
5                  2          2
6                  2          3

答案表:

AnswerId (auto)  QuestionId  Answer
7                0           A
8                0           C
9                0           A
10               0           B
11               0           True

答案表应该是什么样的:

AnswerId (auto)  QuestionId  Answer
7                4           A
8                4           C
9                5           A
10               5           B
11               6           True

以下是代码:

 $questionsql = "INSERT INTO Question (SessionId, QuestionNo) 
    VALUES (?, ?)";
if (!$insert = $mysqli->prepare($questionsql)) {
    // Handle errors with prepare operation here
    echo __LINE__.': '.$mysqli->error;
}

 $answersql = "INSERT INTO Answer (QuestionId, Answer) 
    VALUES (?, ?)";
if (!$insertanswer = $mysqli->prepare($answersql)) {
    // Handle errors with prepare operation here
    echo __LINE__.': '.$mysqli->error;
}



//make sure both prepared statements succeeded before proceeding
if( $insert && $insertanswer)
{
    $sessid =  $_SESSION['id'] . ($_SESSION['initial_count'] > 1 ? $_SESSION['sessionCount'] : '');
    $c = count($_POST['numQuestion']);

    for($i = 0;  $i < $c; $i++ )
    {


            $insert->bind_param("ii", $sessionid, $_POST['numQuestion'][$i]);

            $insert->execute();

            if ($insert->errno) 
            {
                // Handle query error here
                echo __LINE__.': '.$insert->error;
                break 1;
            }
}

        $results = $_POST['value'];
        foreach($results as $id => $value) 
        {
            $answer = $value;

            $lastID = $id;

            $questionidquery = "SELECT QuestionId FROM Question WHERE (QuestionNo = ? AND SessionId = ?)";

        if (!$questionidstmt = $mysqli->prepare($questionidquery)) {
        // Handle errors with prepare operation here
          echo __LINE__.': '.$mysqli->error;
        }


        // Bind parameter for statement
        $questionidstmt->bind_param("ii", $lastID, $sessionId);

        // Execute the statement
        $questionidstmt->execute();

                    if ($questionidstmt->errno) 
                    {
                        // Handle query error here
                        echo __LINE__.': '.$questionidstmt->error;
                        break 2;
                    }

        // This is what matters. With MySQLi you have to bind result fields to
        // variables before calling fetch()
        $questionidstmt->bind_result($quesid);

        // This populates $optionid
        $questionidstmt->fetch(); 

        $questionidstmt->close(); 



            foreach($value as $answer) 
            {
                $insertanswer->bind_param("is", $quesid, $answer);

                $insertanswer->execute();

                if ($insertanswer->errno) {
                    // Handle query error here
                    echo __LINE__.': '.$insertanswer->error;
                    break 3;
                }
            }
        }


    //close your statements at the end


    $insertanswer->close();
    $insert->close();
}

?>

更新

var_dump($ _ POST);

的结果
array(8) { 
["numberAnswer"]=> array(2) { 
         [0]=> string(1) "1" 
         [1]=> string(1) "1" 
         } 
         ["numQuestion"]=> array(2) 
         { 
         [0]=> string(1) "1" 
         [1]=> string(1) "2" 
         } 
         ["questionText"]=> array(2) { 
         [0]=> string(12) "What is 2+2?" 
         [1]=> string(12) "What is 4+4?" 
         } 
         ["gridValues"]=> array(2) { 
         [0]=> string(1) "4" 
         [1]=> string(1) "4" 
         } 
         ["reply"]=> array(2) { 
         [0]=> string(6) "single" 
         [1]=> string(6) "single" 
         } 
         ["textWeight"]=> array(2) { 
         [0]=> string(1) "5" 
         [1]=> string(1) "5" 
         } 
         ["submitDetails"]=> string(14) "Submit Details" ["value"]=> array(2) { 
         [1]=> array(1) { 
         [0]=> string(1) "B" 
         } 
         [2]=> array(1) { 
         [0]=> string(1) "D" 
         } 
         } 
         } 

1 个答案:

答案 0 :(得分:1)

现在你的QuestionID来自$_POST['value'],这可能不是你想要的......你需要在插入每个问题后从mysql中获取自动生成的QuestionID。

您可以使用$mysqli->insert_id检索上次生成的ID。每次调用$insert->execute();后执行此操作,然后在插入答案时使用这些ID。

编辑1:

您应该使用$mysqli->insert_id,因为insert_id仅对连接对象有效(您的名称为$mysqli)。

您还需要将insert_id分配给某个东西。我在跟踪你的代码时遇到了麻烦,但我认为你想要的是将问题ID存储在一个数组中供以后使用,如下所示:

$question_ids[$i] = $mysqli->insert_id

在此之后我想要做的事情让我感到茫然,我想你会用一个相应的问题编号来解答一些答案,但是...也许你可以发布var_dump($_POST)的输出我们会更好理解。在任何情况下,您都需要某种循环来插入每个问题的答案,并且您可以(希望)使用数组$question_ids[$i]来检索QuestionID。

编辑2:

以下是一些示例代码(未经测试),尝试在使用$_POST$_SESSION

获得幻想之前使其正常工作
<?php
$questions = array(
    array(2, 1),
    array(2, 2),
    # etc
);
$answers = array(
    array(A, C),
    array(A, B),
);

$questionsql = "INSERT INTO Question (SessionId, QuestionNo) VALUES (?, ?)";  
if (!$insert = $mysqli->prepare($questionsql)) {
    die('couldn\'t prepare statement 1');
}

$answersql = "INSERT INTO Answer (QuestionId, Answer) VALUES (?, ?)";
if (!$insertanswer = $mysqli->prepare($answersql)) {
    die('couldn\'t prepare statement 2');
}

$c = count($questions);

for($i = 0;  $i < $c; $i++)
{
    $insert->bind_param("ii", $questions[$i][0], $questions[$i][1]);
    $insert->execute();

    if ($insert->errno) 
    {
        die("Error inserting question $i");
    }

    $lastID = $mysqli->insert_id;

    foreach ($ans in $answers[$i])
    {
        $insertanswer->bind_param("is", $lastID, $ans);

        $insertanswer->execute();

        if ($insertanswer->errno) {
            die("Error inserting answer to question $i");
        }
    }

}

$insertanswer->close();
$insert->close();
?>