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為什么用PHP將NULL值插入MySQL表？

[英]Why am I inserting NULL values into a MySQL table with PHP?

 原文  2015-04-09 22:29:37  3   1    php/ jquery/ mysql/ insert/ null

問題描述

我已被分配為一個學校項目創建一個網頁，該網頁將數據發布到MySQL database中名為'STUDYABROAD'的表中。 現在，我所有的值都將以NULL （默認值）插入，並且我無法確定為什么我對html select/option tags引用不起作用。 這項工作是我第一次接觸PHP，而我對該語言的了解非常有限。

該代碼目前使用jQuery填充國家和大洲的級聯dropdowns 。

我打算在代碼中插入StudyID ， Term （一個學生在國外學習的學期）， StudentID （這是一個會話變量），一個學生學習name of the country的name of the country的continent上。

StudyABROAD表結構： 

Name        Type              Null    Default    Extra
StudyID     int(11)           No      None       AUTO-INCREMENT
Term        varchar(15)       Yes     NULL
StudentID   varchar(37)       Yes     NULL
CountryName varchar(75)       Yes     NULL
Continent   varchar(15)       Yes     NULL

PHP，jQuery和HTML代碼： 

<?php

if(isset($_POST['submit']))
{
    upload();
}

function upload() {

require'dbc.php';

$servername = "localhost";
$username = "root";
$password = "isasurvey";
$dbname = "isasurvey";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} 
$StudyID=null;
$term = $_POST['sa_term'];  
$countryname = $_POST['sa_country'];
$continent = $_POST['sa_continent'];

//Insert statement
$stmt = $conn->prepare(" INSERT INTO STUDYABROAD(StudyID, Term, StudentID, CountryName, Continent)  VALUES ( ?, ?, ?, ?, ?)");
$stmt->bind_param("sssss", $studyid, $term, $_SESSION["studentID"], $countryname, $continent);
$stmt->execute();

//if ($conn->query($sql) === TRUE) {
//    echo "New record created successfully";
//} else {
//    echo "Error: " . $sql . "<br>" . $conn->error;
//}

$conn->close();
?>


<!DOCTYPE html>

<head>
<link href="Style.css" rel="stylesheet">

<h1> Miami University </h1>
<h4> Information Systems and Analytics Department </h4>  

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<script type="text/javascript">

function go()
{
var Count = document.getElementById("sa_yesno").options[document.getElementById("sa_yesno").selectedIndex].value;
if(Count==1)
{
document.getElementById("info").style.display = 'none';
}
if(Count==2)
{
    document.getElementById("info").style.display = '';
}
}


</script>

</head>


<body>

<div class="StyleDiv"> 
<form action="Page3.php" method="post" id="myForm" onsubmit="return submit()" action="upload()">

<p> Please share any of the information below that you are comfortable sharing about your study abroad experience, if applicable.</p>
<p> 1. Did you study abroad? </p>

<p><select onchange="go()" name="sa_yesno" id="sa_yesno">
<option value="1">No</option> 
<option value="2">Yes</option> 

</select></p>
</div>
<div class="styleDiv" id="info" style="display:none">

<p> 2. When did you study abroad? </p> 

<p><select name="sa_term" id="sa_term">
<option value='Fall'>Fall Semester</object> 
<option value='Spring'>Spring Semester</object> 
<option value='J-term'>J-Term</object> 
<option value='Summer'>Summer Term</object> 
</select></p>

<p> 3. Where did you study abroad? </p> 

<label class="page1">Continent</label>
<div class="tooltips" title="Please select the continent where you studied.">
    <select id="sa_continent" name="sa_continent" placeholder="Continent">
        <option></option>
        <option>Africa</option>
        <option>Australia</option>
        <option>North America</option>
        <option>South America</option>
        <option>Europe</option>
        <option>Asia</option>
    </select>
</div>

<br/>

<label class="page1">Country</label>
<div class="tooltips" title="Please select the country where you studied.">
    <select id="sa_country" name="sa_country" placeholder="Country"></select>
</div>

<script type="text/javascript">
jQuery(function($) {
    var locations = {

        'Africa': ['Algeria','Angola','Benin','Botswana','Burkina','Burundi','Cameroon', 'Cape Verde',
        'Central African Republic','Chad','Comoros','Congo','Congo, Democratic Republic of','Djibouti',
        'Egypt','Equatorial Guinea','Eritrea','Ethiopia','Gabon','Gambia','Ghana','Guinea',
        'Guinea-Bissau','Ivory Coast','Kenya','Lesotho','Liberia','Libya','Madagascar','Malawi',
        'Mali','Mauritania','Mauritius','Morocco','Mozambique','Namibia','Niger','Nigeria','Rwanda',
        'Sao Tome and Principe','Senegal','Seychelles','Sierra Leone','Somalia','South Africa',
        'South Sudan','Sudan','Swaziland','Tanzania','Togo','Tunisia','Uganda','Zambia','Zimbabwe'],

        'Australia': ['Australia','Fiji','Kiribati','Marshall Islands','Micronesia','Nauru',
        'New Zealand','Palau','Papua New Guinea','Samoa','Solomon Islands','Tonga','Tuvalu','Vanuatu'],

        'North America': ['Antigua and Barbuda','Bahamas','Barbados','Belize','Canada',
        'Costa Rica','Cuba','Dominica','Dominican Republic','El Salvador','Grenada','Guatemala',
        'Haiti','Honduras','Jamaica','Mexico','Nicaragua','Panama','Saint Kitts and Nevis',
        'Saint Lucia','Saint Vincent and the Grenadines','Trinidad and Tobago','United States'],

        'South America': ['Argentina','Bolivia','Brazil','Chile','Colombia','Ecuador',
        'Guyana','Paraguay','Peru','Suriname','Uruguay','Venezuela'],

        'Europe': ['Albania','Andorra','Armenia','Austria','Azerbaijan','Belarus','Belgium',
        'Bosnia and Herzegovina','Bulgaria','Croatia','Cyprus','Czech Republic','Denmark',
        'Estonia','Finland','France','Georgia','Germany','Greece','Hungary','Iceland',
        'Ireland','Italy','Latvia','Liechtenstein','Lithuania','Luxembourg','Macedonia','Malta','Moldova','Monaco',
        'Montenegro','Netherlands','Norway','Poland','Portugal','Romania','San Marino','Serbia','Slovakia','Slovenia',
        'Spain','Sweden','Switzerland','Ukraine','United Kingdom','Vatican City'],

        'Asia': ['Afghanistan','Bahrain','Bangladesh','Bhutan','Brunei','Burma (Myanmar)','Cambodia',
        'China','East Timor','India','Indonesia','Iran','Iraq','Israel','Japan','Jordan','Kazakhstan',
        'Korea, North','Korea, South','Kuwait','Kyrgyzstan','Laos','Lebanon','Malaysia','Maldives',
        'Mongolia','Nepal','Oman','Pakistan','Philippines','Qatar','Russian Federation','Saudi Arabia',
        'Singapore','Sri Lanka','Syria','Tajikistan','Thailand','Turkey','Turkmenistan','United Arab Emirates',
        'Uzbekistan','Vietnam','Yemen'],
    }

    var $locations = $('#sa_country');
    $('#sa_continent').change(function () {
        var country = $(this).val(), lcns = locations[country] || [];

        var html = $.map(lcns, function(lcn){
            return '<option name="sa_country" id="sa_country" value="' + lcn + '">' + lcn + '</option>'
        }).join('');
        $locations.html(html)
    });
});


</script>

<br />
</div>
<input type="submit" value="Next" name="submit" id="submit">
</form>


</body>
</html>

?>

1 個解決方案

解決方案1
 0  2015-04-09 23:15:01

通過消除一些無用的代碼並添加一些所需的代碼，我能夠使插入工作。 額外的動作屬性使我不知所措。 謝謝您的幫助！ 

 <?php session_start(); require'dbc.php'; require 'uuid.php'; if(isset($_POST['submit'])) { upload(); } function upload() { $servername = "localhost"; $username = "root"; $password = "isasurvey"; $dbname = "isasurvey"; // Create connection $conn = new mysqli($servername, $username, $password, $dbname); // Check connection if ($conn->connect_error) { die("Connection failed: " . $conn->connect_error); } $StudyID=null; $term = $_POST['sa_term']; $countryname = $_POST['sa_country']; $continent = $_POST['sa_continent']; $stmt = $conn->prepare(" INSERT INTO STUDYABROAD(StudyID, Term, StudentID, CountryName, Continent) VALUES ( ?, ?, ?, ?, ?)"); $stmt->bind_param("sssss", $studyid, $term, $_SESSION["studentID"], $countryname, $continent); $stmt->execute(); //if ($conn->query($sql) === TRUE) { // echo "New record created successfully"; //} else { // echo "Error: " . $sql . "<br>" . $conn->error; //} $conn->close(); } ?> <!DOCTYPE html> <head> <link href="Style.css" rel="stylesheet"> <h1> Miami University </h1> <h4> Information Systems and Analytics Department </h4> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script> <script type="text/javascript"> function go() { var Count = document.getElementById("sa_yesno").options[document.getElementById("sa_yesno").selectedIndex].value; if(Count==1) { document.getElementById("info").style.display = 'none'; } if(Count==2) { document.getElementById("info").style.display = ''; } } </script> </head> <body> <div class="StyleDiv"> <form action="Page3.php" method="post" id="myForm" onsubmit="return submit()"> <p> Please share any of the information below that you are comfortable sharing about your study abroad experience, if applicable.</p> <p> 1. Did you study abroad? </p> <p><select onchange="go()" name="sa_yesno" id="sa_yesno"> <option value="1">No</option> <option value="2">Yes</option> </select></p> </div> <div class="styleDiv" id="info" style="display:none"> <p> 2. When did you study abroad? </p> <p><select name="sa_term" id="sa_term"> <option value="Fall">Fall Semester</object> <option value="Spring">Spring Semester</object> <option value="J-term">J-Term</object> <option value="Summer">Summer Term</object> </select></p> <p> 3. Where did you study abroad? </p> <label class="page1">Continent</label> <div class="tooltips" title="Please select the continent where you studied."> <select id="sa_continent" name="sa_continent" placeholder="Continent"> <option></option> <option value="Africa">Africa</option> <option value="Australia">Australia</option> <option value="North America">North America</option> <option value="South America">South America</option> <option value="Europe">Europe</option> <option value="Asia">Asia</option> </select> </div> <br/> <label class="page1">Country</label> <div class="tooltips" title="Please select the country where you studied."> <select id="sa_country" name="sa_country" placeholder="Country"></select> </div> <script type="text/javascript"> jQuery(function($) { var locations = { 'Africa': ['Algeria','Angola','Benin','Botswana','Burkina','Burundi','Cameroon', 'Cape Verde', 'Central African Republic','Chad','Comoros','Congo','Congo, Democratic Republic of','Djibouti', 'Egypt','Equatorial Guinea','Eritrea','Ethiopia','Gabon','Gambia','Ghana','Guinea', 'Guinea-Bissau','Ivory Coast','Kenya','Lesotho','Liberia','Libya','Madagascar','Malawi', 'Mali','Mauritania','Mauritius','Morocco','Mozambique','Namibia','Niger','Nigeria','Rwanda', 'Sao Tome and Principe','Senegal','Seychelles','Sierra Leone','Somalia','South Africa', 'South Sudan','Sudan','Swaziland','Tanzania','Togo','Tunisia','Uganda','Zambia','Zimbabwe'], 'Australia': ['Australia','Fiji','Kiribati','Marshall Islands','Micronesia','Nauru', 'New Zealand','Palau','Papua New Guinea','Samoa','Solomon Islands','Tonga','Tuvalu','Vanuatu'], 'North America': ['Antigua and Barbuda','Bahamas','Barbados','Belize','Canada', 'Costa Rica','Cuba','Dominica','Dominican Republic','El Salvador','Grenada','Guatemala', 'Haiti','Honduras','Jamaica','Mexico','Nicaragua','Panama','Saint Kitts and Nevis', 'Saint Lucia','Saint Vincent and the Grenadines','Trinidad and Tobago','United States'], 'South America': ['Argentina','Bolivia','Brazil','Chile','Colombia','Ecuador', 'Guyana','Paraguay','Peru','Suriname','Uruguay','Venezuela'], 'Europe': ['Albania','Andorra','Armenia','Austria','Azerbaijan','Belarus','Belgium', 'Bosnia and Herzegovina','Bulgaria','Croatia','Cyprus','Czech Republic','Denmark', 'Estonia','Finland','France','Georgia','Germany','Greece','Hungary','Iceland', 'Ireland','Italy','Latvia','Liechtenstein','Lithuania','Luxembourg','Macedonia','Malta','Moldova','Monaco', 'Montenegro','Netherlands','Norway','Poland','Portugal','Romania','San Marino','Serbia','Slovakia','Slovenia', 'Spain','Sweden','Switzerland','Ukraine','United Kingdom','Vatican City'], 'Asia': ['Afghanistan','Bahrain','Bangladesh','Bhutan','Brunei','Burma (Myanmar)','Cambodia', 'China','East Timor','India','Indonesia','Iran','Iraq','Israel','Japan','Jordan','Kazakhstan', 'Korea, North','Korea, South','Kuwait','Kyrgyzstan','Laos','Lebanon','Malaysia','Maldives', 'Mongolia','Nepal','Oman','Pakistan','Philippines','Qatar','Russian Federation','Saudi Arabia', 'Singapore','Sri Lanka','Syria','Tajikistan','Thailand','Turkey','Turkmenistan','United Arab Emirates', 'Uzbekistan','Vietnam','Yemen'], } var $locations = $('#sa_country'); $('#sa_continent').change(function () { var country = $(this).val(), lcns = locations[country] || []; var html = $.map(lcns, function(lcn){ return '<option name="sa_country" id="sa_country" value="' + lcn + '">' + lcn + '</option>' }).join(''); $locations.html(html) }); }); </script> <br /> </div> <input type="submit" value="Next" name="submit" id="submit"> </form> </body> </html>

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