{"id":1280,"date":"2013-01-29T00:45:28","date_gmt":"2013-01-29T08:45:28","guid":{"rendered":"http:\/\/www.mysqltutorial.org\/?page_id=1280"},"modified":"2024-01-03T21:12:39","modified_gmt":"2024-01-04T04:12:39","slug":"php-querying-data-from-mysql-database","status":"publish","type":"page","link":"https:\/\/www.mysqltutorial.org\/php-mysql\/php-querying-data-from-mysql-database\/","title":{"rendered":"PHP MySQL: Querying Data from Database"},"content":{"rendered":"\n<p><strong>Summary<\/strong><em>: <\/em>in this tutorial, you will learn how to query data from the MySQL database by using PHP PDO.<\/p>\n\n\n\n<p>To query data from a table using PHP, you follow these steps:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>First, <a href=\"https:\/\/www.mysqltutorial.org\/php-mysql\/php-connecting-to-mysql-database\/\">connect to the MySQL database<\/a>.<\/li>\n\n\n\n<li>Second, create a prepared statement.<\/li>\n\n\n\n<li>Third, execute the prepared statement with data.<\/li>\n\n\n\n<li>Finally, process the result set.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Querying all rows from a table<\/h2>\n\n\n\n<p>The following <code>select.php<\/code> script retrieves all rows from the <code>tasks<\/code> table:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-meta\">&lt;?php<\/span>\r\n<span class=\"hljs-keyword\">require_once<\/span> <span class=\"hljs-string\">'config.php'<\/span>;\r\n\r\n<span class=\"hljs-keyword\">try<\/span> {\r\n    <span class=\"hljs-comment\">\/\/ connect to MySQL server<\/span>\r\n    $conn = <span class=\"hljs-keyword\">new<\/span> PDO(<span class=\"hljs-string\">\"mysql:host=$host;dbname=$dbname\"<\/span>, $username, $password);\r\n    \r\n    <span class=\"hljs-comment\">\/\/ execute a query<\/span>\r\n    $sql = <span class=\"hljs-string\">'select * from tasks'<\/span>;\r\n    $stmt = $conn-&gt;query($sql);\r\n    $stmt-&gt;setFetchMode(PDO::FETCH_ASSOC);\r\n\r\n    <span class=\"hljs-comment\">\/\/ process the results<\/span>\r\n    $tasks = &#91;];\r\n    <span class=\"hljs-keyword\">while<\/span> ($row = $stmt-&gt;fetch()) {\r\n        $tasks&#91;] = &#91;\r\n            <span class=\"hljs-string\">'title'<\/span> =&gt; $row&#91;<span class=\"hljs-string\">'title'<\/span>], \r\n            <span class=\"hljs-string\">'completed'<\/span> =&gt; $row&#91;<span class=\"hljs-string\">'completed'<\/span>] == <span class=\"hljs-number\">0<\/span> ? <span class=\"hljs-keyword\">false<\/span> : <span class=\"hljs-keyword\">true<\/span>\r\n        ];\r\n    }\r\n    \r\n    <span class=\"hljs-comment\">\/\/ display the task list<\/span>\r\n    <span class=\"hljs-keyword\">require<\/span> <span class=\"hljs-string\">'select.view.php'<\/span>;\r\n} <span class=\"hljs-keyword\">catch<\/span> (PDOException $e) {\r\n    <span class=\"hljs-keyword\">die<\/span>($e);\r\n}\r\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>How it works.<\/p>\n\n\n\n<p>First, include the&nbsp;<code>config.php<\/code>&nbsp;file that contains the database configuration:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-keyword\">require_once<\/span> <span class=\"hljs-string\">'config.php'<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Second, construct a <code><a href=\"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-select-from\/\">SELECT<\/a><\/code> statement:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">$sql = <span class=\"hljs-string\">'select * from tasks'<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Third, execute the <code>SELECT<\/code> statement by calling the <code>query()<\/code> method of the PDO object:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">$stmt = $conn-&gt;query($sql);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Fourth, set the fetch mode to <code>PDO::FETCH_ASSO<\/code> so that the result sets will be an associative array.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"> $stmt-&gt;setFetchMode(PDO::FETCH_ASSOC);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Fifth, iterate over the rows and append them to the <code>$tasks<\/code> array:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">$tasks = &#91;];\r\n<span class=\"hljs-keyword\">while<\/span> ($row = $stmt-&gt;fetch()) {\r\n    $tasks&#91;] = &#91;\r\n        <span class=\"hljs-string\">'title'<\/span> =&gt; $row&#91;<span class=\"hljs-string\">'title'<\/span>],\r\n        <span class=\"hljs-string\">'completed'<\/span> =&gt; $row&#91;<span class=\"hljs-string\">'completed'<\/span>] == <span class=\"hljs-number\">0<\/span> ? <span class=\"hljs-keyword\">false<\/span> : <span class=\"hljs-keyword\">true<\/span>\r\n    ];\r\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Finally, include the <code>select.view.php<\/code> script to display the to-do list. The <code>select.view.php<\/code> iterates over the <code>$tasks<\/code> array and displays each item:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">&lt;!DOCTYPE html&gt;\n&lt;html lang=<span class=\"hljs-string\">\"en\"<\/span>&gt;\n    &lt;head&gt;\n        &lt;meta charset=<span class=\"hljs-string\">\"UTF-8\"<\/span>&gt;\n        &lt;meta name=<span class=\"hljs-string\">\"viewport\"<\/span> content=<span class=\"hljs-string\">\"width=device-width, initial-scale=1.0\"<\/span>&gt;\n        &lt;title&gt;Todo&lt;\/title&gt;\n    &lt;\/head&gt;\n    &lt;body&gt;\n        &lt;table&gt;\n            &lt;h1&gt;My Todo&lt;\/h1&gt;\n            &lt;thead&gt;\n                &lt;tr&gt;\n                    &lt;th&gt;Title&lt;\/th&gt;\n                    &lt;th&gt;Completed&lt;\/th&gt;\n                &lt;\/tr&gt;\n            &lt;\/thead&gt;\n            &lt;tbody&gt;\n                <span class=\"hljs-meta\">&lt;?php<\/span> <span class=\"hljs-keyword\">foreach<\/span> ($tasks <span class=\"hljs-keyword\">as<\/span> $task): <span class=\"hljs-meta\">?&gt;<\/span>\n                &lt;tr&gt;\n                    &lt;td&gt;<span class=\"hljs-meta\">&lt;?<\/span>= $task&#91;<span class=\"hljs-string\">'title'<\/span>] <span class=\"hljs-meta\">?&gt;<\/span>&lt;\/td&gt;\n                    &lt;td&gt;<span class=\"hljs-meta\">&lt;?<\/span>= $task&#91;<span class=\"hljs-string\">'completed'<\/span>] ?  <span class=\"hljs-string\">'\u2705'<\/span> : <span class=\"hljs-string\">'\u2b1c'<\/span> <span class=\"hljs-meta\">?&gt;<\/span>&lt;\/td&gt;\n                &lt;\/tr&gt;\n                <span class=\"hljs-meta\">&lt;?php<\/span> <span class=\"hljs-keyword\">endforeach<\/span> <span class=\"hljs-meta\">?&gt;<\/span>\n            &lt;\/tbody&gt;\n        &lt;\/table&gt;\n    &lt;\/body&gt;\n\n&lt;\/html&gt;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the <code>query()<\/code> method of a prepared statement to retrieve data from a table.<\/li>\n<\/ul>\n<div class=\"helpful-block-content\" data-title=\"\">\n\t<header>\n\t\t<div class=\"wth-question\">Was this tutorial helpful? <\/div>\n\t\t<div class=\"wth-thumbs\">\n\t\t\t<button\n\t\t\t\tdata-post=\"1280\"\n\t\t\t\tdata-post-url=\"https:\/\/www.mysqltutorial.org\/php-mysql\/php-querying-data-from-mysql-database\/\"\n\t\t\t\tdata-post-title=\"PHP MySQL: Querying Data from Database\"\n\t\t\t\tdata-response=\"1\"\n\t\t\t\tclass=\"wth-btn-rounded 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wth-no-btn\"\n\t\t\t>\n\t\t\t\t<svg\n\t\t\t\t\txmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n\t\t\t\t\tviewBox=\"0 0 24 24\"\n\t\t\t\t\tfill=\"none\"\n\t\t\t\t\tstroke=\"currentColor\"\n\t\t\t\t\tstroke-width=\"2\"\n\t\t\t\t\tstroke-linecap=\"round\"\n\t\t\t\t\tstroke-linejoin=\"round\"\n\t\t\t\t>\n\t\t\t\t\t<path\n\t\t\t\t\t\td=\"M10 15v4a3 3 0 0 0 3 3l4-9V2H5.72a2 2 0 0 0-2 1.7l-1.38 9a2 2 0 0 0 2 2.3zm7-13h2.67A2.31 2.31 0 0 1 22 4v7a2.31 2.31 0 0 1-2.33 2H17\"\n\t\t\t\t\t><\/path>\n\t\t\t\t<\/svg>\n\t\t\t\t<span class=\"sr-only\"> No <\/span>\n\t\t\t<\/button>\n\t\t<\/div>\n\t<\/header>\n\n\t<div class=\"wth-form hidden\">\n\t\t<div class=\"wth-form-wrapper\">\n\t\t\t<div class=\"wth-title\"><\/div>\n\t\t\t\n\t\t\t<textarea class=\"wth-message\"><\/textarea>\n\n\t\t\t<button class=\"btn btn-primary wth-btn-submit\">Send<\/button>\n\t\t\t<button class=\"btn wth-btn-cancel\">Cancel<\/button>\n\t\t\n\t\t<\/div>\n\t<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>You will learn how to query data from MySQL database by using PHP PDO and use PDO prepared statement to select data securely.<\/p>\n","protected":false},"author":2,"featured_media":2885,"parent":1268,"menu_order":3,"comment_status":"open","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":["post-1280","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>PHP MySQL: Querying Data from Database<\/title>\n<meta name=\"description\" content=\"You will learn how to query data from MySQL database by using PHP PDO and use PDO prepared statement to securely select data.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.mysqltutorial.org\/php-mysql\/php-querying-data-from-mysql-database\/\" \/>\n<meta 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