{"id":5770,"date":"2017-06-15T00:30:29","date_gmt":"2017-06-15T07:30:29","guid":{"rendered":"http:\/\/www.mysqltutorial.org\/?page_id=5770"},"modified":"2024-01-02T02:30:43","modified_gmt":"2024-01-02T09:30:43","slug":"update","status":"publish","type":"page","link":"https:\/\/www.mysqltutorial.org\/mysql-nodejs\/update\/","title":{"rendered":"Updating Data in MySQL Database from Node.js"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to update data in the MySQL database from a Node.js application.<\/p>\n\n\n\n<p class=\"note\">This tutorial picks up where the <a href=\"https:\/\/www.mysqltutorial.org\/mysql-nodejs\/select\/\">Querying Data in MySQL Database from Node.js<\/a> tutorial left off.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Updating data<\/h2>\n\n\n\n<p>To update data in a table in MySQL from a Node.js application, you follow these steps:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.mysqltutorial.org\/mysql-nodejs\/connect\/\">Connect to the MySQL database server<\/a>.<\/li>\n\n\n\n<li>Execute an <a href=\"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-update\/\"><code>UPDATE<\/code><\/a> statement by calling the <code>query()<\/code> method on a <code>Connection<\/code> object.<\/li>\n\n\n\n<li>Close the database connection.<\/li>\n<\/ul>\n\n\n\n<p>The following <code>update.js<\/code> program sets the value of the <code>completed<\/code> column of row id 1 in the <code>todos<\/code> table to false:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">let<\/span> mysql = <span class=\"hljs-built_in\">require<\/span>(<span class=\"hljs-string\">'mysql'<\/span>);\n\n<span class=\"hljs-keyword\">let<\/span> connection = mysql.createConnection({\n  <span class=\"hljs-attr\">host<\/span>: process.env.DB_HOST,\n  <span class=\"hljs-attr\">port<\/span>: process.env.DB_PORT,\n  <span class=\"hljs-attr\">user<\/span>: process.env.DB_USER,\n  <span class=\"hljs-attr\">password<\/span>: process.env.DB_PASSWORD,\n  <span class=\"hljs-attr\">database<\/span>: process.env.DB_NAME,\n});\n\nconnection.connect(<span class=\"hljs-function\">(<span class=\"hljs-params\">err<\/span>) =&gt;<\/span> {\n  <span class=\"hljs-keyword\">if<\/span> (err) <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-built_in\">console<\/span>.error(err.message);\n\n  <span class=\"hljs-keyword\">let<\/span> sql = <span class=\"hljs-string\">`UPDATE todos\n           SET completed = ?\n           WHERE id = ?`<\/span>;\n\n  <span class=\"hljs-keyword\">let<\/span> data = &#91;<span class=\"hljs-literal\">false<\/span>, <span class=\"hljs-number\">1<\/span>];\n\n  connection.query(sql, data, (error, results, fields) =&gt; {\n    <span class=\"hljs-keyword\">if<\/span> (error) <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-built_in\">console<\/span>.error(error.message);\n    <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">'Rows affected:'<\/span>, results.affectedRows);\n  });\n\n  <span class=\"hljs-comment\">\/\/ close the database connection<\/span>\n  connection.end();\n});<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><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>How it works.<\/p>\n\n\n\n<p>First, import the <code>mysql<\/code> module:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">let<\/span> mysql = <span class=\"hljs-built_in\">require<\/span>(<span class=\"hljs-string\">'mysql'<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><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>Second, create a connection to the MySQL database using the <code>createConnection<\/code> method:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">let<\/span> connection = mysql.createConnection({\n  <span class=\"hljs-attr\">host<\/span>: process.env.DB_HOST,\n  <span class=\"hljs-attr\">port<\/span>: process.env.DB_PORT,\n  <span class=\"hljs-attr\">user<\/span>: process.env.DB_USER,\n  <span class=\"hljs-attr\">password<\/span>: process.env.DB_PASSWORD,\n  <span class=\"hljs-attr\">database<\/span>: process.env.DB_NAME,\n});<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><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>Note that we retrieve the connection parameters (host, port, user, password, and database) from environment variables using <code>.env<\/code>.<\/p>\n\n\n\n<p>Third, connect to the MySQL database:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">connection.connect(<span class=\"hljs-function\">(<span class=\"hljs-params\">err<\/span>) =&gt;<\/span> {\n  <span class=\"hljs-keyword\">if<\/span> (err) <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-built_in\">console<\/span>.error(err.message);\n});<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><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>This code checks and logs for any connection errors if any.<\/p>\n\n\n\n<p>Fourth, define an SQL query to update a record in the <code>todos<\/code> table:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">let<\/span> sql = <span class=\"hljs-string\">`UPDATE todos\n           SET completed = ?\n           WHERE id = ?`<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><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>Fifth, specify the data used in the query:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">let<\/span> data = &#91;<span class=\"hljs-literal\">false<\/span>, <span class=\"hljs-number\">1<\/span>];<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><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>In this case, the first placeholder <code>?<\/code> in the SQL query will be replaced by <code>false<\/code>, and the second placeholder <code>?<\/code> will be replaced by <code>1<\/code>.<\/p>\n\n\n\n<p>Sixth, execute the SQL query using the <code>query<\/code> method:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">connection.query(sql, data, (error, results, fields) =&gt; {\n  <span class=\"hljs-keyword\">if<\/span> (error) <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-built_in\">console<\/span>.error(error.message);\n  <span class=\"hljs-built_in\">console<\/span>.log(<span class=\"hljs-string\">'Rows affected:'<\/span>, results.affectedRows);\n});<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><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>This code executes the query and displays the number of rows affected.<\/p>\n\n\n\n<p>Finally, close the database connection:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"CSS\" data-shcb-language-slug=\"css\"><span><code class=\"hljs language-css\"><span class=\"hljs-selector-tag\">connection<\/span><span class=\"hljs-selector-class\">.end<\/span>();\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">CSS<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">css<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\">Verify the update<\/h2>\n\n\n\n<p>First, retrieve the row with id 1 from the todos table:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">SELECT * FROM todos WHERE id = 1;<\/code><\/span><\/pre>\n\n\n<p>Output:<\/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\">+----+-------------------------------+-----------+\n| id | title                         | completed |\n+----+-------------------------------+-----------+\n|  <span class=\"hljs-number\">1<\/span> | Learn how to insert a <span class=\"hljs-keyword\">new<\/span> row |         <span class=\"hljs-number\">1<\/span> |\n+----+-------------------------------+-----------+\n<span class=\"hljs-number\">1<\/span> row <span class=\"hljs-keyword\">in<\/span> <span class=\"hljs-keyword\">set<\/span> (0.00 sec)<\/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>Second, run the <code>update.js<\/code> program.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-10\" data-shcb-language-name=\"CSS\" data-shcb-language-slug=\"css\"><span><code class=\"hljs language-css\"><span class=\"hljs-selector-tag\">node<\/span> <span class=\"hljs-selector-tag\">--env-file<\/span> <span class=\"hljs-selector-class\">.env<\/span> <span class=\"hljs-selector-tag\">update<\/span><span class=\"hljs-selector-class\">.js<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">CSS<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">css<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The output indicates that the number of updated rows is 1. <\/p>\n\n\n\n<p>Third, query data from the <code>todos<\/code> table:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-11\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">select * <span class=\"hljs-keyword\">from<\/span> todos where id=<span class=\"hljs-number\">1<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-11\"><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>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-12\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">+----+-------------------------------+-----------+\n| id | title                         | completed |\n+----+-------------------------------+-----------+\n|  <span class=\"hljs-number\">1<\/span> | Learn how to insert a <span class=\"hljs-keyword\">new<\/span> row |         <span class=\"hljs-number\">0<\/span> |\n+----+-------------------------------+-----------+\n<span class=\"hljs-number\">1<\/span> row <span class=\"hljs-keyword\">in<\/span> <span class=\"hljs-keyword\">set<\/span> (0.00 sec)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-12\"><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 data showed that the value in the completed column was updated to 0.<\/p>\n\n\n\n<p>In this tutorial, you have learned how to update data in a MySQL table from a Node.js application.<\/p>\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=\"5770\"\n\t\t\t\tdata-post-url=\"https:\/\/www.mysqltutorial.org\/mysql-nodejs\/update\/\"\n\t\t\t\tdata-post-title=\"Updating Data in MySQL Database from Node.js\"\n\t\t\t\tdata-response=\"1\"\n\t\t\t\tclass=\"wth-btn-rounded 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application.<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":5759,"menu_order":4,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-5770","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Updating Data in MySQL Database from Node.js<\/title>\n<meta name=\"description\" content=\"In this tutorial, you will learn how to update data in the MySQL database from a node.js application.\" \/>\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\/mysql-nodejs\/update\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Updating Data in MySQL Database from Node.js\" 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