How to insert correct values in database [closed] - php

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Closed 10 years ago.
I have a jsfiddle here: http://jsfiddle.net/ybZvv/58/
Please follow steps in fiddle:
1: When you open fiddle, click on "Add Question" button twice, this will append 2 rows.
2: In first row select answer buttons "A" and "C", in second row select answer buttons "A", "B" and "E". The text input values for each answer button selected is displayed underneath.
Now what I want to do is post the question number and the answer values into the database.
The database should look like this below when posted:
Question Table:
QuestionId (Question Number)
1
2
Answer Table:
AnswerId (auto) QuestionId Answer
1 1 A
2 1 C
3 2 A
4 2 B
5 2 E
What my question is that how do I post the answers and the correct question numbers in my mysqli code below so that it inserts those Answers and Question Numbers in the "Question" and "Answer" Tables?
Below I have set up the mysqli/php code, but it needs retweaked so it can insert the answers and the relevant question numbers correctly.
$i = 0;
$c = count($_POST['numQuestion']); //count number of rows
for($i = 0; $i < $c; $i++ ){
$questionsql = "INSERT INTO Question (QuestionId)
VALUES (?)";
if (!$insert = $mysqli->prepare($questionsql)) {
// Handle errors with prepare operation here
}
$insert->bind_param("i", $_POST['numQuestion'][$i]);
$insert->execute();
if ($insert->errno) {
// Handle query error here
}
$insert->close();
$lastID = $mysqli->insert_id;
$answersql = "INSERT INTO Answer (QuestionId, Answer)
VALUES (?, ?, ?)";
if (!$insertanswer = $mysqli->prepare($answersql)) {
// Handle errors with prepare operation here
}
$insertanswer->bind_param("is", $lastID, $_POST['value'][$i]);
$insertanswer->execute();
if ($insertanswer->errno) {
// Handle query error here
}
$insertanswer->close();
}
I have done a var_dump($_POST) for the above scenario and this is what it outputs:
array(2) {
["numQuestion"]=> array(2) {
[0]=> string(1) "1"
[1]=> string(1) "2"
}
["submitDetails"]=> string(14) "Submit Details"
["value"]=> array(4) {
["answerARow"]=> string(1) "A"
["answerCRow"]=> string(1) "C"
["answerBRow"]=> string(1) "B"
["answerERow"]=> string(1) "E"
}
}
I am receiving 2 errors which are identical:
Warning: mysqli_stmt::execute(): (23000/1048): Column 'Answer' cannot
be null in /.../ on line 257 Warning: mysqli_stmt::execute():
(23000/1048): Column 'Answer' cannot be null in /.../ on line 257
UPDATE:
I have updated fiddle to include the multi-dimensional array, sorry I forgot to put it in but the line of code for this is below:
var $newBtn = $(("<input class='answerBtnsRow answers' type='button' style='display:%s;' onclick='btnclick(this, " + gQuestionIndex + ");' />").replace('%s',$this.is(':visible')?'inline-block':'none')).attr('name', "value[" + gQuestionIndex + "][]").attr('value', $this.val()).attr('class', $this.attr('class')).attr('id', $this.attr('id')+'Row');
My suggestion is to use a multi-dimensional array in this format: value[n][], where n is the question number. With this new setup, you should end up with the following input fields:
<input type="hidden" value="A" name="value[1][]">
<input type="hidden" value="B" name="value[1][]">
<input type="hidden" value="A" name="value[2][]">
<input type="hidden" value="C" name="value[2][]">
<input type="hidden" value="E" name="value[2][]">
Note that the selected value is encoded in the value attribute. The name attribute only contains the question to which the value belongs.

Answer 1

It seems like the $POST does not have all the information, i suggest you to change the post structure to relation the question to the answer, something like this:
array(2) {
["numQuestion"]=> array(2) {
[0]=> string(1) "1"
[1]=> string(1) "2"
}
["submitDetails"]=> string(14) "Submit Details"
["question_1"] => array(2) {
[0] => string(1) "A"
[1] => string(1) "C"
}
["question_2"] => array(2) {
[0] => string(1) "A"
[1] => string(1) "B"
[2] => string(1) "E"
}
}
Now, if the post would have that structure, you could do something like this to insert the data:
$numQuestionArray = $_POST["numQuestion"];
for($i =0; $i < count($numQuestionArray);$i++)
{
$questionId = $numQuestionArray[$i];
$questionsql = "INSERT INTO Question (QuestionId) VALUES (?)";
if (!$insert = $mysqli->prepare($questionsql)) {
// Handle errors with prepare operation here
}
$insert->bind_param("i", $questionId);
$insert->execute();
if ($insert->errno) {
// Handle query error here
}
$insert->close();
$lastID = $mysqli->insert_id;
$questionAnswerPostStr = "question_".$questionId;
$answerArray = $_POST[$questionAnswerPostStr];
for($j =0; $j < count($numQuestionArray);$j++)
{
$answer = $numQuestionArray[$j];
$answersql = "INSERT INTO Answer (QuestionId, Answer) VALUES (?, ?)";
if (!$insertanswer = $mysqli->prepare($answersql)) {
// Handle errors with prepare operation here
}
$insertanswer->bind_param("is", $lastID, $answer);
$insertanswer->execute();
if ($insertanswer->errno) {
// Handle query error here
}
$insertanswer->close();
}
}
However, i still think the question_id should be auto incremented on the table instead of inserting the $POST value.