{"id":941,"date":"2016-05-16T11:13:03","date_gmt":"2016-05-16T04:13:03","guid":{"rendered":"http:\/\/www.sqlitetutorial.net\/?page_id=941"},"modified":"2024-10-28T21:48:20","modified_gmt":"2024-10-28T14:48:20","slug":"query","status":"publish","type":"page","link":"https:\/\/www.sqlitetutorial.net\/sqlite-php\/query\/","title":{"rendered":"SQLite PHP: Querying Data"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to query data from SQLite tables using PHP PDO.<\/p>\n\n\n\n<p class=\"note\">This tutorial begins where the &#8220;<a href=\"https:\/\/www.sqlitetutorial.net\/sqlite-php\/insert\/\">Insert data into a table in PHP<\/a>&#8221; tutorial left off.<\/p>\n\n\n\n<p>To query data from a table in PHP using PDO, you follow these steps:<\/p>\n\n\n\n<p>Step 1. <a href=\"https:\/\/www.sqlitetutorial.net\/sqlite-php\/connect\/\">Connect to the SQLite database<\/a>:<\/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\">$pdo = <span class=\"hljs-keyword\">new<\/span> \\PDO($dsn);<\/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>Step 2. Execute a <a href=\"https:\/\/www.sqlitetutorial.net\/sqlite-select\/\">SELECT<\/a> statement using the <code>query()<\/code> method of the <code>PDO<\/code> object:<\/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\">$rows = $pdo-&gt;query($sql);<\/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>The <code>query()<\/code> method returns a result set as a <code>PDOStatement<\/code> object. <\/p>\n\n\n\n<p>If you want to pass values to the <code>SELECT<\/code> statement, you can:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Create the <code>PDOStatement<\/code> object by calling the <code>prepare()<\/code> method of the <code>PDO<\/code> object.<\/li>\n\n\n\n<li>Bind values using the <code>bindValue()<\/code> method of the <code>PDOStatement<\/code> object.<\/li>\n\n\n\n<li>Call the <code>execute()<\/code> method to execute the <code>SELECT<\/code> statement.<\/li>\n<\/ul>\n\n\n\n<p>Here&#8217;s the code to do these three steps:<\/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\">$stmt = $pdo-&gt;prepare($sql);\n$stmt-&gt;bindValue(<span class=\"hljs-string\">':id'<\/span>,$id);\n$stmt-&gt;execute();<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Alternatively, you can pass values to the <code>execute()<\/code> method directly:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">$stmt = $pdo-&gt;prepare($sql);\n$stmt-&gt;execute(&#91;\n   <span class=\"hljs-string\">':id'<\/span> =&gt; id\n]);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Step 3. Fetch rows from the result set using the <code>fetch()<\/code> method of the <code>PDOStatement<\/code> object and process each row individually:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-keyword\">while<\/span> ($row = $stmt-&gt;fetch(\\PDO::FETCH_ASSOC)) {\n   <span class=\"hljs-comment\">\/\/ process each row in the result set<\/span>\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>If you are interested in various fetch modes, check out the <a href=\"https:\/\/www.phptutorial.net\/php-pdo\/\" target=\"_blank\" rel=\"noreferrer noopener\">Fetching Data section on the PHP tutorial website<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Querying all rows from a table<\/h2>\n\n\n\n<p>Step 1. Create a new file called <code>query.php<\/code> within the project directory.<\/p>\n\n\n\n<p>Step 2. Define the <code>get_projects()<\/code> function that retrieves all rows from the <code>projects<\/code> table:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-meta\">&lt;?php<\/span>\n\n<span class=\"hljs-keyword\">require_once<\/span> <span class=\"hljs-string\">'config.php'<\/span>;\n\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">get_projects<\/span><span class=\"hljs-params\">($pdo)<\/span> <\/span>{\n\n    $stmt = $pdo-&gt;query(<span class=\"hljs-string\">'SELECT project_id, project_name FROM projects'<\/span>);\n    \n    $projects = &#91;];\n    \n    <span class=\"hljs-keyword\">while<\/span> ($row = $stmt-&gt;fetch(\\PDO::FETCH_ASSOC)) {\n        $projects&#91;] = &#91;\n            <span class=\"hljs-string\">'project_id'<\/span> =&gt; $row&#91;<span class=\"hljs-string\">'project_id'<\/span>],\n            <span class=\"hljs-string\">'project_name'<\/span> =&gt; $row&#91;<span class=\"hljs-string\">'project_name'<\/span>]\n        ];\n    }\n    <span class=\"hljs-keyword\">return<\/span> $projects;\n}\n\n$dsn = <span class=\"hljs-string\">\"sqlite:$db\"<\/span>;\n\n<span class=\"hljs-keyword\">try<\/span> {\n    $pdo = <span class=\"hljs-keyword\">new<\/span> \\PDO($dsn);\n\n    <span class=\"hljs-comment\">\/\/ get all projects<\/span>\n    $projects = get_projects($pdo);\n    var_dump($projects);\n\n} <span class=\"hljs-keyword\">catch<\/span>(\\PDOException $e) {\n    <span class=\"hljs-keyword\">echo<\/span> $e-&gt;getMessage();\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>How it works.<\/p>\n\n\n\n<p>First, load the configuration from the <code>config.php<\/code> file:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-keyword\">require_once<\/span> <span class=\"hljs-string\">'config.php'<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The <code>config.php<\/code> stores the path to the SQLite database file:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-meta\">&lt;?php<\/span>\n\n$db = <span class=\"hljs-string\">'.\/database\/my.db'<\/span>;<\/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>Second, define the <code>get_projects()<\/code> function that retrieves all rows from the <code>projects<\/code> table:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-9\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">get_projects<\/span><span class=\"hljs-params\">($pdo)<\/span> <\/span>{\n\n    $stmt = $pdo-&gt;query(<span class=\"hljs-string\">'SELECT project_id, project_name FROM projects'<\/span>);\n    \n    $projects = &#91;];\n    \n    <span class=\"hljs-keyword\">while<\/span> ($row = $stmt-&gt;fetch(\\PDO::FETCH_ASSOC)) {\n        $projects&#91;] = &#91;\n            <span class=\"hljs-string\">'project_id'<\/span> =&gt; $row&#91;<span class=\"hljs-string\">'project_id'<\/span>],\n            <span class=\"hljs-string\">'project_name'<\/span> =&gt; $row&#91;<span class=\"hljs-string\">'project_name'<\/span>]\n        ];\n    }\n    <span class=\"hljs-keyword\">return<\/span> $projects;\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Third, construct the data source name (<code>dsn<\/code>) for connecting to the SQLite database:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-10\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">$dsn = <span class=\"hljs-string\">\"sqlite:$db\"<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Fourth, open a database connection:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-11\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">$pdo = <span class=\"hljs-keyword\">new<\/span> \\PDO($dsn);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-11\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Fifth, call the <code>get_projects<\/code> function to retrieve all rows from the <code>projects<\/code> table and dump the result set:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-12\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">$projects = get_projects($pdo);\nvar_dump($projects);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-12\"><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, display an error message if an error occurs while opening the database connection or querying data:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-13\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">} <span class=\"hljs-keyword\">catch<\/span>(\\PDOException $e) {\n    <span class=\"hljs-keyword\">echo<\/span> $e-&gt;getMessage();\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-13\"><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>Step 3. Run the <code>query.php<\/code> in the web browser.<\/p>\n\n\n\n<p>You&#8217;ll see the following output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-14\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-keyword\">array<\/span> (size=<span class=\"hljs-number\">2<\/span>)\n  <span class=\"hljs-number\">0<\/span> =&gt; \n    <span class=\"hljs-keyword\">array<\/span> (size=<span class=\"hljs-number\">2<\/span>)\n      <span class=\"hljs-string\">'project_id'<\/span> =&gt; int <span class=\"hljs-number\">1<\/span>\n      <span class=\"hljs-string\">'project_name'<\/span> =&gt; string <span class=\"hljs-string\">'PHP SQLite Demo'<\/span> (length=<span class=\"hljs-number\">15<\/span>)\n  <span class=\"hljs-number\">1<\/span> =&gt; \n    <span class=\"hljs-keyword\">array<\/span> (size=<span class=\"hljs-number\">2<\/span>)\n      <span class=\"hljs-string\">'project_id'<\/span> =&gt; int <span class=\"hljs-number\">2<\/span>\n      <span class=\"hljs-string\">'project_name'<\/span> =&gt; string <span class=\"hljs-string\">'Mastering SQLite'<\/span> (length=<span class=\"hljs-number\">16<\/span>)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-14\"><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\">Finding tasks for a project<\/h2>\n\n\n\n<p>Step 1. Define a new function <code>get_tasks_by_project()<\/code> that retrieves all tasks of a project specified by a project id, in the <code>query.php<\/code> file:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-15\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">get_tasks_by_project<\/span><span class=\"hljs-params\">($pdo, $projectId)<\/span> <\/span>{\n\n    $sql = <span class=\"hljs-string\">'SELECT  * FROM tasks\n            WHERE project_id = :project_id'<\/span>;\n\n    $stmt = $pdo-&gt;prepare($sql);\n    \n    $stmt-&gt;execute(&#91;<span class=\"hljs-string\">':project_id'<\/span> =&gt; $projectId]);\n\n    $tasks = &#91;];\n    <span class=\"hljs-keyword\">while<\/span> ($row = $stmt-&gt;fetch(\\PDO::FETCH_ASSOC)) {\n        $tasks&#91;] = &#91;\n            <span class=\"hljs-string\">'task_id'<\/span>        =&gt; $row&#91;<span class=\"hljs-string\">'task_id'<\/span>],\n            <span class=\"hljs-string\">'task_name'<\/span>      =&gt; $row&#91;<span class=\"hljs-string\">'task_name'<\/span>],\n            <span class=\"hljs-string\">'start_date'<\/span>     =&gt; $row&#91;<span class=\"hljs-string\">'start_date'<\/span>],\n            <span class=\"hljs-string\">'completed_date'<\/span> =&gt; $row&#91;<span class=\"hljs-string\">'completed_date'<\/span>],\n            <span class=\"hljs-string\">'completed'<\/span>      =&gt; $row&#91;<span class=\"hljs-string\">'completed'<\/span>],\n            <span class=\"hljs-string\">'project_id'<\/span>     =&gt; $row&#91;<span class=\"hljs-string\">'project_id'<\/span>],\n        ];\n    }\n\n    <span class=\"hljs-keyword\">return<\/span> $tasks;\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-15\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Step 2. Call the <code>get_tasks_by_project()<\/code> function to get all tasks of the project with id 1:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-16\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">$tasks = get_tasks_by_project($pdo, <span class=\"hljs-number\">1<\/span>);\nvar_dump($tasks);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-16\"><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>Step 3. Run the <code>query.php<\/code> in the web browser.<\/p>\n\n\n\n<p>It&#8217;ll show three tasks of the project id 1:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-17\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-keyword\">array<\/span> (size=<span class=\"hljs-number\">3<\/span>)\n  <span class=\"hljs-number\">0<\/span> =&gt; \n    <span class=\"hljs-keyword\">array<\/span> (size=<span class=\"hljs-number\">6<\/span>)\n      <span class=\"hljs-string\">'task_id'<\/span> =&gt; int <span class=\"hljs-number\">1<\/span>\n      <span class=\"hljs-string\">'task_name'<\/span> =&gt; string <span class=\"hljs-string\">'Prepare the sample database schema'<\/span> (length=<span class=\"hljs-number\">34<\/span>)\n      <span class=\"hljs-string\">'start_date'<\/span> =&gt; string <span class=\"hljs-string\">'2016-06-01'<\/span> (length=<span class=\"hljs-number\">10<\/span>)\n      <span class=\"hljs-string\">'completed_date'<\/span> =&gt; string <span class=\"hljs-string\">'2016-06-01'<\/span> (length=<span class=\"hljs-number\">10<\/span>)\n      <span class=\"hljs-string\">'completed'<\/span> =&gt; int <span class=\"hljs-number\">1<\/span>\n      <span class=\"hljs-string\">'project_id'<\/span> =&gt; string <span class=\"hljs-string\">'1'<\/span> (length=<span class=\"hljs-number\">1<\/span>)\n  <span class=\"hljs-number\">1<\/span> =&gt; \n    <span class=\"hljs-keyword\">array<\/span> (size=<span class=\"hljs-number\">6<\/span>)\n      <span class=\"hljs-string\">'task_id'<\/span> =&gt; int <span class=\"hljs-number\">2<\/span>\n      <span class=\"hljs-string\">'task_name'<\/span> =&gt; string <span class=\"hljs-string\">'Create new tables '<\/span> (length=<span class=\"hljs-number\">18<\/span>)\n      <span class=\"hljs-string\">'start_date'<\/span> =&gt; string <span class=\"hljs-string\">'2016-05-01'<\/span> (length=<span class=\"hljs-number\">10<\/span>)\n      <span class=\"hljs-string\">'completed_date'<\/span> =&gt; string <span class=\"hljs-string\">'2016-05-02'<\/span> (length=<span class=\"hljs-number\">10<\/span>)\n      <span class=\"hljs-string\">'completed'<\/span> =&gt; int <span class=\"hljs-number\">1<\/span>\n      <span class=\"hljs-string\">'project_id'<\/span> =&gt; string <span class=\"hljs-string\">'1'<\/span> (length=<span class=\"hljs-number\">1<\/span>)\n  <span class=\"hljs-number\">2<\/span> =&gt; \n    <span class=\"hljs-keyword\">array<\/span> (size=<span class=\"hljs-number\">6<\/span>)\n      <span class=\"hljs-string\">'task_id'<\/span> =&gt; int <span class=\"hljs-number\">3<\/span>\n      <span class=\"hljs-string\">'task_name'<\/span> =&gt; string <span class=\"hljs-string\">'Insert some sample data'<\/span> (length=<span class=\"hljs-number\">23<\/span>)\n      <span class=\"hljs-string\">'start_date'<\/span> =&gt; string <span class=\"hljs-string\">'2016-05-01'<\/span> (length=<span class=\"hljs-number\">10<\/span>)\n      <span class=\"hljs-string\">'completed_date'<\/span> =&gt; string <span class=\"hljs-string\">'2016-06-02'<\/span> (length=<span class=\"hljs-number\">10<\/span>)\n      <span class=\"hljs-string\">'completed'<\/span> =&gt; int <span class=\"hljs-number\">1<\/span>\n      <span class=\"hljs-string\">'project_id'<\/span> =&gt; string <span class=\"hljs-string\">'1'<\/span> (length=<span class=\"hljs-number\">1<\/span>)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-17\"><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>Here&#8217;s the complete <code>query.php<\/code> code:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-18\" 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<span class=\"hljs-keyword\">require_once<\/span> <span class=\"hljs-string\">'config.php'<\/span>;\n\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">get_projects<\/span><span class=\"hljs-params\">($pdo)<\/span> <\/span>{\n    $stmt = $pdo-&gt;query(<span class=\"hljs-string\">'SELECT project_id, project_name FROM projects'<\/span>);\n  \n    $projects = &#91;];\n    \n    <span class=\"hljs-keyword\">while<\/span> ($row = $stmt-&gt;fetch(\\PDO::FETCH_ASSOC)) {\n        $projects&#91;] = &#91;\n            <span class=\"hljs-string\">'project_id'<\/span> =&gt; $row&#91;<span class=\"hljs-string\">'project_id'<\/span>],\n            <span class=\"hljs-string\">'project_name'<\/span> =&gt; $row&#91;<span class=\"hljs-string\">'project_name'<\/span>]\n        ];\n    }\n    <span class=\"hljs-keyword\">return<\/span> $projects;\n}\n\n\n\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">get_tasks_by_project<\/span><span class=\"hljs-params\">($pdo, $projectId)<\/span> <\/span>{\n\n    $sql = <span class=\"hljs-string\">'SELECT  * FROM tasks\n            WHERE project_id = :project_id'<\/span>;\n\n    $stmt = $pdo-&gt;prepare($sql);\n    \n    $stmt-&gt;execute(&#91;<span class=\"hljs-string\">':project_id'<\/span> =&gt; $projectId]);\n\n    $tasks = &#91;];\n    <span class=\"hljs-keyword\">while<\/span> ($row = $stmt-&gt;fetch(\\PDO::FETCH_ASSOC)) {\n        $tasks&#91;] = &#91;\n            <span class=\"hljs-string\">'task_id'<\/span>        =&gt; $row&#91;<span class=\"hljs-string\">'task_id'<\/span>],\n            <span class=\"hljs-string\">'task_name'<\/span>      =&gt; $row&#91;<span class=\"hljs-string\">'task_name'<\/span>],\n            <span class=\"hljs-string\">'start_date'<\/span>     =&gt; $row&#91;<span class=\"hljs-string\">'start_date'<\/span>],\n            <span class=\"hljs-string\">'completed_date'<\/span> =&gt; $row&#91;<span class=\"hljs-string\">'completed_date'<\/span>],\n            <span class=\"hljs-string\">'completed'<\/span>      =&gt; $row&#91;<span class=\"hljs-string\">'completed'<\/span>],\n            <span class=\"hljs-string\">'project_id'<\/span>     =&gt; $row&#91;<span class=\"hljs-string\">'project_id'<\/span>],\n        ];\n    }\n\n    <span class=\"hljs-keyword\">return<\/span> $tasks;\n}\n\n\n$dsn = <span class=\"hljs-string\">\"sqlite:$db\"<\/span>;\n\n<span class=\"hljs-keyword\">try<\/span> {\n    $pdo = <span class=\"hljs-keyword\">new<\/span> \\PDO($dsn);\n\n    <span class=\"hljs-comment\">\/\/ get all projects<\/span>\n    $projects = get_projects($pdo);\n    var_dump($projects);\n\n     <span class=\"hljs-comment\">\/\/ get tasks by project<\/span>\n    $tasks = get_tasks_by_project($pdo, <span class=\"hljs-number\">1<\/span>);\n    var_dump($tasks);\n\n} <span class=\"hljs-keyword\">catch<\/span>(\\PDOException $e) {\n    <span class=\"hljs-keyword\">echo<\/span> $e-&gt;getMessage();\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-18\"><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>Call the <code>query()<\/code>method of the <code>PDO<\/code> object to execute a <code>SELECT<\/code> statement to retrieve data from tables.<\/li>\n\n\n\n<li>Use a prepared statement (<code>PDOStatement<\/code>) to execute a <code>SELECT<\/code> statement with values to retrieve data from tables.<\/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=\"941\"\n\t\t\t\tdata-post-url=\"https:\/\/www.sqlitetutorial.net\/sqlite-php\/query\/\"\n\t\t\t\tdata-post-title=\"SQLite PHP: Querying Data\"\n\t\t\t\tdata-response=\"1\"\n\t\t\t\tclass=\"wth-btn-rounded wth-yes-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\tclass=\"feather feather-thumbs-up block w-full h-full\"\n\t\t\t\t>\n\t\t\t\t\t<path\n\t\t\t\t\t\td=\"M14 9V5a3 3 0 0 0-3-3l-4 9v11h11.28a2 2 0 0 0 2-1.7l1.38-9a2 2 0 0 0-2-2.3zM7 22H4a2 2 0 0 1-2-2v-7a2 2 0 0 1 2-2h3\"\n\t\t\t\t\t><\/path>\n\t\t\t\t<\/svg>\n\t\t\t\t<span class=\"sr-only\"> Yes <\/span>\n\t\t\t<\/button>\n\n\t\t\t<button\n\t\t\t\tdata-response=\"0\"\n\t\t\t\tdata-post=\"941\"\n\t\t\t\tdata-post-url=\"https:\/\/www.sqlitetutorial.net\/sqlite-php\/query\/\"\n\t\t\t\tdata-post-title=\"SQLite PHP: Querying Data\"\n\t\t\t\tclass=\"wth-btn-rounded 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>Summary: in this tutorial, you will learn how to query data from SQLite tables using PHP PDO. This tutorial begins where the &#8220;Insert data into a table in PHP&#8221; tutorial left off. To query data from a table in PHP using PDO, you follow these steps: Step 1. Connect to the SQLite database: Step 2. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":891,"menu_order":4,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-941","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>SQLite PHP: Querying Data<\/title>\n<meta name=\"description\" content=\"In this tutorial, you will learn how to query data from SQLite tables using PHP PDO.\" \/>\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.sqlitetutorial.net\/sqlite-php\/query\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SQLite PHP: Querying Data\" \/>\n<meta property=\"og:description\" content=\"In this 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