{"id":1271,"date":"2013-01-29T00:44:21","date_gmt":"2013-01-29T08:44:21","guid":{"rendered":"http:\/\/www.mysqltutorial.org\/?page_id=1271"},"modified":"2024-01-14T21:14:51","modified_gmt":"2024-01-15T04:14:51","slug":"php-connecting-to-mysql-database","status":"publish","type":"page","link":"https:\/\/www.mysqltutorial.org\/php-mysql\/php-connecting-to-mysql-database\/","title":{"rendered":"PHP MySQL: Connecting to MySQL Database"},"content":{"rendered":"\n<p><strong>Summary:<\/strong> in this tutorial, you will learn how to connect to a MySQL server using a PDO object.<\/p>\n\n\n\n<p>Before connecting to a MySQL database, you need to have the following database information:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>MySQL data source name or <code>DSN<\/code> :\u00a0 Specify the address of the MySQL server. You can use an IP address or server name such as <code>127.0.0.1<\/code> \u00a0or\u00a0<code>localhost<\/code>.<\/li>\n\n\n\n<li>Database name: Indicate the name of the database to which you want to connect.<\/li>\n\n\n\n<li>Username and password: Specify the username and password of the MySQL user that you use to connect to the MySQL server. <\/li>\n<\/ul>\n\n\n\n<p>Note that the user account must have sufficient privileges&nbsp;to access the database.<\/p>\n\n\n\n<p>We will use the following MySQL server information:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The local MySQL database server, so the <code>DSN<\/code> is <code>localhost<\/code> .<\/li>\n\n\n\n<li>The <code>todo<\/code> databases.<\/li>\n\n\n\n<li>The <code>root<\/code> account with a password.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Creating a sample database<\/h2>\n\n\n\n<p>First, open the Command Prompt on Windows or Terminal on Unix-like systems and <a href=\"https:\/\/www.mysqltutorial.org\/getting-started-with-mysql\/connect-to-mysql-server\/\">connect to the MySQL server<\/a> using the mysql client tool:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">mysql -u root -p<\/code><\/span><\/pre>\n\n\n<p>Second, <a href=\"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-create-database\/\">create a new database<\/a> called <code>todo<\/code>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">DATABASE<\/span> todo;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Third, exit the mysql client tool:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">exit<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\">Connecting to a MySQL server<\/h2>\n\n\n\n<p>First, create a new PHP file <code>config.php<\/code> to store the connection parameters:<\/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\"><span class=\"hljs-meta\">&lt;?php<\/span>\n\n$host = <span class=\"hljs-string\">'localhost'<\/span>;\n$dbname = <span class=\"hljs-string\">'todo'<\/span>;\n$username = <span class=\"hljs-string\">'&lt;user&gt;'<\/span>;\n$password = <span class=\"hljs-string\">'&lt;password&gt;'<\/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>You need to replace the username\/password with the actual one.<\/p>\n\n\n\n<p>Second, create a new PHP file named&nbsp;<code>connect.php<\/code> :<\/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\"><span class=\"hljs-meta\">&lt;?php<\/span>\n<span class=\"hljs-keyword\">require_once<\/span> <span class=\"hljs-string\">'config.php'<\/span>;\n\n<span class=\"hljs-keyword\">try<\/span> {\n    $conn = <span class=\"hljs-keyword\">new<\/span> PDO(<span class=\"hljs-string\">\"mysql:host=$host;dbname=$dbname\"<\/span>, $username, $password);\n    <span class=\"hljs-keyword\">echo<\/span> <span class=\"hljs-string\">\"Connected to $dbname at $host successfully.\"<\/span>;\n} <span class=\"hljs-keyword\">catch<\/span> (PDOException $pe) {\n    <span class=\"hljs-keyword\">die<\/span>(<span class=\"hljs-string\">\"Could not connect to the database $dbname :\"<\/span> . $pe-&gt;getMessage());\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>How the script works.<\/p>\n\n\n\n<p>First, include the\u00a0<code>config.php<\/code> file in the script using the <a href=\"https:\/\/www.phptutorial.net\/php-tutorial\/php-require\/\">require_once<\/a>\u00a0function:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-keyword\">require_once<\/span> <span class=\"hljs-string\">'config.php'<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Second, establish a connection to the MySQL server by creating a new PDO object with the database connections from the <code>config.php<\/code> file:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">$conn = <span class=\"hljs-keyword\">new<\/span> PDO(<span class=\"hljs-string\">\"mysql:host=$host;dbname=$dbname\"<\/span>, $username, $password);<\/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>Display a success message if the connection to the MySQL server is established successfully:<\/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\"> <span class=\"hljs-keyword\">echo<\/span> <span class=\"hljs-string\">\"Connected to $dbname at $host successfully.\"<\/span>;<\/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<p>Otherwise, show the error message from the <code>PDOException<\/code> object:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-keyword\">die<\/span>(<span class=\"hljs-string\">\"Could not connect to the database $dbname :\"<\/span> . $pe-&gt;getMessage());<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The <code><a href=\"https:\/\/www.phptutorial.net\/php-oop\/php-try-catch\/\">try...catch<\/a><\/code> statement catches and handles any exceptions that may occur.<\/p>\n\n\n\n<p>Third, open the <code>connect.php<\/code> file on the web browser such as:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-9\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">http:<span class=\"hljs-comment\">\/\/localhost\/phppdo\/connect.php<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The following output message indicates that you have successfully connected to the MySQL server from PHP:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">Connected to todo at localhost successfully.<\/code><\/span><\/pre>\n\n\n<p>When the script ends, PHP automatically closes the connection to the MySQL server. If you want to\u00a0explicitly close the database connection, you can set the PDO object to <code>null<\/code> as follows:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-10\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">$conn = <span class=\"hljs-keyword\">null<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><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>Create a new instance of the PDO object to establish a connection to a MySQL server from PHP.<\/li>\n<\/ul>\n<div class=\"helpful-block-content\" data-title=\"\">\n\t<header>\n\t\t<div class=\"wth-question\">Was this 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