{"id":5539,"date":"2022-08-29T09:26:02","date_gmt":"2022-08-29T03:56:02","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-undefined-index-inside-a-while-php\/"},"modified":"2022-08-29T09:26:02","modified_gmt":"2022-08-29T03:56:02","slug":"solved-undefined-index-inside-a-while-php","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-undefined-index-inside-a-while-php\/","title":{"rendered":"[Solved] Undefined Index inside a While PHP"},"content":{"rendered":"

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The field “candidateid” should be integer data type, but you are enclosed this field value with ”(single quotes)<\/strong> in the update query?<\/p>\n

$sql = \"UPDATE candidate_info SET numberofvotes = 1 WHERE candidateid = '$candidateid'\";\n<\/code><\/pre>\n
if it is an integer datatype then you should remove the single quote<\/p>\n
$sql = \"UPDATE candidate_info SET numberofvotes = 1 WHERE candidateid = $candidateid\";\n<\/code><\/pre>\n
and in MySQL every field names are case sensitive, so as you told the field names are <\/p>\n
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candidateid, candidatename, position, numberofvotes<\/p>\n<\/blockquote>\n
so, you should use these names when you retrieving the values as well<\/p>\n
    <?php\n             if(isset($_POST['update'])) {\n                $dbhost=\"localhost\";\n                $dbuser=\"root\";\n                $dbpass=\"\";\n                $candidateid = $_POST['candidateid'];\n                $conn = mysql_connect($dbhost, $dbuser, $dbpass);\n\n                if(! $conn ) {\n                   die('Could not connect: ' . mysql_error());\n                }\n\n                $candidateid = $_POST['candidateid'];\n\n\n                $sql = \"UPDATE candidate_info SET numberofvotes = numberofvotes + 1 WHERE candidateid = '$candidateid'\" ;\n                mysql_select_db('election2016');\n                $retval = mysql_query( $sql, $conn );\n\n                if(! $retval ) {\n                   die('Could not update data: ' . mysql_error());\n                }\n                echo \"Updated data successfully\\n\";\n\n                mysql_close($conn);\n             }\n    ?>\n<html>\n    <center>\n    <font size=\"2\" face = \"century gothic\">\n    <?php\n    $con=mysqli_connect(\"localhost\",\"root\",\"\",\"election2016\");\n    \/\/ Check connection\n    if (mysqli_connect_errno())\n    {\n    echo \"Failed to connect to MySQL: \" . mysqli_connect_error();\n    }\n    $result = mysqli_query($con,\"SELECT * FROM candidate_info\");\n    ?>\n    <form method = \"post\" action = \"<?php $_PHP_SELF ?>\">\n    <?php\n    echo \"<table border=\"1\">\n    <tr>\n    <th>Candidate Name<\/th>\n    <th>Position<\/th>\n    <th>Vote<\/th>\n    <th>Number of Votes<\/th>\n    <\/tr>\";\n    while ($row = mysqli_fetch_array($result)) {\n        echo \"<tr>\";\n        echo \"<td>\" . $row['candidatename'] . \"<\/td>\";\n        echo \"<td>\" . $row['position'] . \"<\/td>\";\n        echo \"<td><input type=\"radio\" name=\"candidateid\" value=\"\".$row[\"candidateid'].\"' >\";\n        echo \"<td>\" . $row['numberofvotes'] . \"<\/td>\";\n    }\n    echo \"<\/table>\";\n    mysqli_close($con);\n    ?>\n\n    <br>\n    <br>\n    <input name = \"update\" type = \"submit\" id = \"update\" value = \"update\">\n    <\/form>\n    <\/center>\n    <\/font>\n    <\/html>\n<\/code><\/pre>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            16<\/span> <\/p><\/div>\n<\/div>\n
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solved Undefined Index inside a While PHP <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] The field “candidateid” should be integer data type, but you are enclosed this field value with ”(single quotes) in the update query? $sql = “UPDATE candidate_info SET numberofvotes = 1 WHERE candidateid = ‘$candidateid'”; if it is an integer datatype then you should remove the single quote $sql = “UPDATE candidate_info SET numberofvotes = … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[339],"class_list":["post-5539","post","type-post","status-publish","format-standard","hentry","category-solved","tag-php"],"yoast_head":"\n[Solved] Undefined Index inside a While PHP - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-undefined-index-inside-a-while-php\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Undefined Index inside a While PHP - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] The field “candidateid” should be integer data type, but you are enclosed this field value with ”(single quotes) in the update query? $sql = "UPDATE candidate_info SET numberofvotes = 1 WHERE candidateid = '$candidateid'"; if it is an integer datatype then you should remove the single quote $sql = "UPDATE candidate_info SET numberofvotes = ... 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