{"id":3291,"date":"2014-10-22T18:20:16","date_gmt":"2014-10-23T02:20:16","guid":{"rendered":"http:\/\/www.mysqltutorial.org\/?page_id=3291"},"modified":"2024-01-02T21:27:29","modified_gmt":"2024-01-03T04:27:29","slug":"python-mysql-delete-data","status":"publish","type":"page","link":"https:\/\/www.mysqltutorial.org\/python-mysql\/python-mysql-delete-data\/","title":{"rendered":"Python MySQL &#8211; Delete Data from a Table"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to delete data from a table in the MySQL database using Python.<\/p>\n\n\n\n<p class=\"note\">This tutorial picks up where <a href=\"https:\/\/www.mysqltutorial.org\/python-mysql-update\/\">Updating Data in a Table<\/a>&nbsp;tutorial left off.<\/p>\n\n\n\n<p>To delete data from a table from a Python program, you follow these steps:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>First, <a title=\"Python Connecting to MySQL Databases\" href=\"https:\/\/www.mysqltutorial.org\/python-mysql\/python-connecting-mysql-databases\/\">connect to the database<\/a> by creating a new <code>MySQLConnection<\/code> object.<\/li>\n\n\n\n<li>Next, create a new cursor object from the Connection object.  <\/li>\n\n\n\n<li>Then, call the <code>execute()<\/code> method of the cursor object. <\/li>\n\n\n\n<li>After that, commit the changes by calling the <code>commit()<\/code> method of the <code>MySQLConnection<\/code> object.<\/li>\n\n\n\n<li>Finally, close the cursor and database connection by calling&nbsp; <code>close()<\/code> method of the corresponding object.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Deleting program<\/h2>\n\n\n\n<p>The The following example shows you how to delete a book specified by book id:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-keyword\">from<\/span> mysql.connector <span class=\"hljs-keyword\">import<\/span> MySQLConnection, Error\n<span class=\"hljs-keyword\">from<\/span> config <span class=\"hljs-keyword\">import<\/span> read_config\n\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">def<\/span> <span class=\"hljs-title\">delete_book<\/span><span class=\"hljs-params\">(book_id)<\/span>:<\/span>\n    <span class=\"hljs-comment\"># read database configuration<\/span>\n    config = read_config()\n\n    <span class=\"hljs-comment\"># prepare query and data<\/span>\n    query = <span class=\"hljs-string\">\"DELETE FROM books WHERE id = %s\"<\/span>\n\n    data = (book_id, ) \n\n    affected_rows = <span class=\"hljs-number\">0<\/span>  <span class=\"hljs-comment\"># Initialize the variable to store the number of affected rows<\/span>\n\n    <span class=\"hljs-keyword\">try<\/span>:\n        <span class=\"hljs-comment\"># connect to the database<\/span>\n        <span class=\"hljs-keyword\">with<\/span> MySQLConnection(**config) <span class=\"hljs-keyword\">as<\/span> conn:\n            <span class=\"hljs-comment\"># update book title<\/span>\n            <span class=\"hljs-keyword\">with<\/span> conn.cursor() <span class=\"hljs-keyword\">as<\/span> cursor:\n                cursor.execute(query, data)\n\n                <span class=\"hljs-comment\"># get the number of affected rows<\/span>\n                affected_rows = cursor.rowcount\n\n            <span class=\"hljs-comment\"># accept the changes<\/span>\n            conn.commit()\n\n    <span class=\"hljs-keyword\">except<\/span> Error <span class=\"hljs-keyword\">as<\/span> error:\n        print(error)\n\n    <span class=\"hljs-keyword\">return<\/span> affected_rows  <span class=\"hljs-comment\"># Return the number of affected rows<\/span>\n\n<span class=\"hljs-keyword\">if<\/span> __name__ == <span class=\"hljs-string\">'__main__'<\/span>:\n    affected_rows = delete_book(<span class=\"hljs-number\">37<\/span>)\n    print(<span class=\"hljs-string\">f'Number of affected rows: <span class=\"hljs-subst\">{affected_rows}<\/span>'<\/span>)\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>How it works.<\/p>\n\n\n\n<p>How it works.<\/p>\n\n\n\n<p>First, import the necessary modules including <code>MySQLConnection<\/code> and <code>Error<\/code> are classes from the <code>mysql.connector<\/code> module, and <code>read_config<\/code> is a function from a custom module <code>config<\/code>.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-keyword\">from<\/span> mysql.connector <span class=\"hljs-keyword\">import<\/span> MySQLConnection, Error\n<span class=\"hljs-keyword\">from<\/span> config <span class=\"hljs-keyword\">import<\/span> read_config<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Second, define a  function named <code>delete_book<\/code> that takes one parameter <code>book_id<\/code>. The function reads the database configuration and prepares an SQL query to delete the book with the specified ID:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">def<\/span> <span class=\"hljs-title\">delete_book<\/span><span class=\"hljs-params\">(book_id)<\/span>:<\/span>\r\n    <span class=\"hljs-comment\"># read database configuration<\/span>\r\n    config = read_config()\r\n\r\n    <span class=\"hljs-comment\"># prepare query and data<\/span>\r\n    query = <span class=\"hljs-string\">\"DELETE FROM books WHERE id = %s\"<\/span>\r\n\r\n    data = (book_id, ) <\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Third, open a database connection (<code>MySQLConnection<\/code>) with the configuration from the configuration file and create a cursor (cursor). Inside the nested <code>with<\/code> statement, delete the book specified by the ID and return the number of affected rows obtained from <code>cursor.rowcount<\/code>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\">affected_rows = <span class=\"hljs-number\">0<\/span>  <span class=\"hljs-comment\"># Initialize the variable to store the number of affected rows<\/span>\r\n\r\n    <span class=\"hljs-keyword\">try<\/span>:\r\n        <span class=\"hljs-comment\"># connect to the database<\/span>\r\n        <span class=\"hljs-keyword\">with<\/span> MySQLConnection(**config) <span class=\"hljs-keyword\">as<\/span> conn:\r\n            <span class=\"hljs-comment\"># update book title<\/span>\r\n            <span class=\"hljs-keyword\">with<\/span> conn.cursor() <span class=\"hljs-keyword\">as<\/span> cursor:\r\n                cursor.execute(query, data)\r\n\r\n                <span class=\"hljs-comment\"># get the number of affected rows<\/span>\r\n                affected_rows = cursor.rowcount\r\n\r\n            <span class=\"hljs-comment\"># accept the changes<\/span>\r\n            conn.commit()<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Fourth, display the error if it occurs during the delete:<\/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\">    except <span class=\"hljs-built_in\">Error<\/span> <span class=\"hljs-keyword\">as<\/span> error:\n        print(error)<\/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, return the number of affected rows:<\/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-keyword\">return<\/span> affected_rows  <span class=\"hljs-comment\"># Return the number of affected rows<\/span><\/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, call the <code>delete_book()<\/code> function to delete the book with id 37:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-keyword\">if<\/span> __name__ == <span class=\"hljs-string\">'__main__'<\/span>:\r\n    affected_rows = delete_book(<span class=\"hljs-number\">37<\/span>)\r\n    print(<span class=\"hljs-string\">f'Number of affected rows: <span class=\"hljs-subst\">{affected_rows}<\/span>'<\/span>)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/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>execute()<\/code> method of a cursor object to run the <code>DELETE<\/code> statement to delete data in a table and the <code>commit()<\/code> method of a connection object to apply the changes to the database.<\/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=\"3291\"\n\t\t\t\tdata-post-url=\"https:\/\/www.mysqltutorial.org\/python-mysql\/python-mysql-delete-data\/\"\n\t\t\t\tdata-post-title=\"Python MySQL &#8211; Delete Data from a Table\"\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 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Python.<\/p>\n","protected":false},"author":2,"featured_media":3327,"parent":3229,"menu_order":5,"comment_status":"open","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":["post-3291","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>Python MySQL - Delete Data from a Table in Python<\/title>\n<meta name=\"description\" content=\"In this tutorial, you will learn how to delete data from a table in MySQL from a Python program using the Python \/ MySQL connector.\" \/>\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\/python-mysql\/python-mysql-delete-data\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta 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