{"id":3273,"date":"2014-10-21T18:52:00","date_gmt":"2014-10-22T02:52:00","guid":{"rendered":"http:\/\/www.mysqltutorial.org\/?page_id=3273"},"modified":"2024-01-03T00:18:06","modified_gmt":"2024-01-03T07:18:06","slug":"calling-mysql-stored-procedures-python","status":"publish","type":"page","link":"https:\/\/www.mysqltutorial.org\/python-mysql\/calling-mysql-stored-procedures-python\/","title":{"rendered":"Python MySQL &#8211; Call Stored Procedures in Python"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to call MySQL stored procedures in Python by using MySQL Connector\/Python API.<\/p>\n\n\n\n<p class=\"note\">This tutorial picks up where <a href=\"https:\/\/www.mysqltutorial.org\/python-mysql\/python-mysql-delete-data\/\">Deleting Data from a Table<\/a> tutorial left off.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Before we start<\/h2>\n\n\n\n<p>If you are not familiar with stored procedures in MySQL or you want to review it as a refresher, you can follow the <a title=\"MySQL Stored Procedures\" href=\"https:\/\/www.mysqltutorial.org\/mysql-stored-procedure\/\">MySQL stored procedures tutorial<\/a>.<\/p>\n\n\n\n<p>We will <a href=\"https:\/\/www.mysqltutorial.org\/mysql-stored-procedure\/getting-started-with-mysql-stored-procedures\/\">create two stored procedures<\/a> for the demonstration in this tutorial:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>find_all()<\/code> &#8211; return all books &amp; authors<\/li>\n\n\n\n<li><code>find_book_by_isbn()<\/code> &#8211; return the title of a book based on its ISBN.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">1) The find_all() stored procedure<\/h3>\n\n\n\n<p>First, create a stored procedure that retrieves all books and authors from the <code>pub<\/code> database:<\/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\">USE<\/span> pub;\n\nDELIMITER $$\n\n<span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">PROCEDURE<\/span> find_all()\n<span class=\"hljs-keyword\">BEGIN<\/span>\n\t<span class=\"hljs-keyword\">SELECT<\/span> \n\t\ttitle, \n\t\tisbn, \n        <span class=\"hljs-keyword\">CONCAT<\/span>(first_name,<span class=\"hljs-string\">' '<\/span>,last_name) <span class=\"hljs-keyword\">AS<\/span> author\n\t<span class=\"hljs-keyword\">FROM<\/span> books\n\t<span class=\"hljs-keyword\">INNER<\/span> <span class=\"hljs-keyword\">JOIN<\/span> book_author \n\t\t<span class=\"hljs-keyword\">ON<\/span> book_author.book_id =  books.id\n\t<span class=\"hljs-keyword\">INNER<\/span> <span class=\"hljs-keyword\">JOIN<\/span> <span class=\"hljs-keyword\">authors<\/span>\n\t\t<span class=\"hljs-keyword\">ON<\/span> book_author.author_id = authors.id\n\t<span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span> title;\n<span class=\"hljs-keyword\">END<\/span>$$\n\nDELIMITER ;<\/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>The\u00a0 <code>find_all()<\/code> stored procedure has a <code>SELECT<\/code>\u00a0statement with <code><a href=\"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-inner-join\/\">INNER JOIN<\/a><\/code> clauses that retrieve the title, ISBN, and author&#8217;s full name from\u00a0<code>books<\/code> and <code>authors<\/code> tables.<\/p>\n\n\n\n<p>Second, call the <code>find_all()<\/code> stored procedure:<\/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\"><span class=\"hljs-keyword\">CALL<\/span> find_all();<\/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<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"392\" height=\"217\" src=\"https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2019\/09\/mysql-python-call-stored-procedure.png\" alt=\"\" class=\"wp-image-8644\" srcset=\"https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2019\/09\/mysql-python-call-stored-procedure.png 392w, https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2019\/09\/mysql-python-call-stored-procedure-200x111.png 200w\" sizes=\"auto, (max-width: 392px) 100vw, 392px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">2) The find_by_isbn() stored procedure<\/h3>\n\n\n\n<p>The following creates the stored procedure <code>find_by_isbn()<\/code> that finds a book based on an ISBN:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">DELIMITER $$\n\n<span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">PROCEDURE<\/span> find_by_isbn(\n\t<span class=\"hljs-keyword\">IN<\/span> p_isbn <span class=\"hljs-built_in\">VARCHAR<\/span>(<span class=\"hljs-number\">13<\/span>),\n    <span class=\"hljs-keyword\">OUT<\/span> p_title <span class=\"hljs-built_in\">VARCHAR<\/span>(<span class=\"hljs-number\">255<\/span>)\n)\n<span class=\"hljs-keyword\">BEGIN<\/span>\n\t<span class=\"hljs-keyword\">SELECT<\/span> title \n    <span class=\"hljs-keyword\">INTO<\/span> p_title \n    <span class=\"hljs-keyword\">FROM<\/span> books\n\t<span class=\"hljs-keyword\">WHERE<\/span> isbn = p_isbn;\n<span class=\"hljs-keyword\">END<\/span>$$\n\nDELIMITER ;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><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>The\u00a0 <code>find_by_isbn()<\/code> accepts two parameters: <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ISBN (IN parameter) <\/li>\n\n\n\n<li>title (OUT parameter). <\/li>\n<\/ul>\n\n\n\n<p>When you pass an ISBN to the stored procedure, you will obtain the title of the book, for example:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">CALL<\/span> find_by_isbn(<span class=\"hljs-string\">'1235927658929'<\/span>,@title);\n<span class=\"hljs-keyword\">SELECT<\/span> @title;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><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>Here is the output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">+<span class=\"hljs-comment\">-------------------------------------------------+<\/span>\n| @title                                          |\n+<span class=\"hljs-comment\">-------------------------------------------------+<\/span>\n| Debatable Land Between This World and the Next  |\n+<span class=\"hljs-comment\">-------------------------------------------------+<\/span>\n1 row in <span class=\"hljs-keyword\">set<\/span> (<span class=\"hljs-number\">0.00<\/span> sec)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><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\">Calling stored procedures in Python<\/h2>\n\n\n\n<p>To call a stored procedure in Python, you follow these steps:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>First, connect to the database by creating a new <code>MySQLConnection<\/code> object.<\/li>\n\n\n\n<li>Second, create a new cursor object from the connection object by calling the <code>cursor()<\/code> method.<\/li>\n\n\n\n<li>Third, call\u00a0<code>callproc()<\/code> method of the <code>MySQLCursor<\/code> object to execute the stored procedure.<\/li>\n\n\n\n<li>Finally, close the cursor and database connection as always.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">1) Calling stored procedure example<\/h3>\n\n\n\n<p>The following example demonstrates how to call the\u00a0<code>find_all()<\/code> stored procedure in Python:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" 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\r\n<span class=\"hljs-keyword\">from<\/span> config <span class=\"hljs-keyword\">import<\/span> read_config\r\n\r\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">def<\/span> <span class=\"hljs-title\">find_all_books<\/span><span class=\"hljs-params\">()<\/span>:<\/span>\r\n    <span class=\"hljs-keyword\">try<\/span>:\r\n        <span class=\"hljs-comment\"># Read database configuration from the config file<\/span>\r\n        config = read_config()\r\n\r\n        <span class=\"hljs-comment\"># Establish a connection to the MySQL 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\"># Create a cursor to execute SQL queries<\/span>\r\n            <span class=\"hljs-keyword\">with<\/span> conn.cursor() <span class=\"hljs-keyword\">as<\/span> cursor:\r\n                <span class=\"hljs-comment\"># Call the stored procedure 'find_all'<\/span>\r\n                cursor.callproc(<span class=\"hljs-string\">'find_all'<\/span>)\r\n\r\n                <span class=\"hljs-comment\"># Process the results of the stored procedure<\/span>\r\n                results = &#91;]\r\n                <span class=\"hljs-keyword\">for<\/span> result <span class=\"hljs-keyword\">in<\/span> cursor.stored_results():\r\n                    results.append(result.fetchall())\r\n\r\n                <span class=\"hljs-keyword\">return<\/span> results\r\n\r\n    <span class=\"hljs-keyword\">except<\/span> Error <span class=\"hljs-keyword\">as<\/span> e:\r\n        <span class=\"hljs-keyword\">raise<\/span> e\r\n\r\n<span class=\"hljs-keyword\">if<\/span> __name__ == <span class=\"hljs-string\">'__main__'<\/span>:\r\n    <span class=\"hljs-keyword\">try<\/span>:\r\n        result = find_all_books()\r\n        print(result)\r\n    <span class=\"hljs-keyword\">except<\/span> Error <span class=\"hljs-keyword\">as<\/span> e:\r\n        print(e)\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\">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>First, import the necessary classes (<code>MySQLConnection<\/code> and <code>Error<\/code>) from the <code>mysql.connector<\/code> module and a function <code>read_config<\/code> from a module named <code>config<\/code>:<\/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\">from<\/span> mysql.connector <span class=\"hljs-keyword\">import<\/span> MySQLConnection, Error\r\n<span class=\"hljs-keyword\">from<\/span> config <span class=\"hljs-keyword\">import<\/span> read_config\r<\/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<p>Second, define a function called <code>find_all_books()<\/code> that will call the stored procedure <code>find_all()<\/code>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" 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\">find_all_books<\/span><span class=\"hljs-params\">()<\/span>:<\/span>\n   <span class=\"hljs-comment\"># ...<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><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>Inside the <code>find_all_books()<\/code> function, call the stored procedure <code>find_all()<\/code> using the <code>callproc()<\/code> stored procedure, iterating the result of the <code>stored_results()<\/code> method, fetching all rows from each result set, and appending them to the <code>results<\/code> list.<\/p>\n\n\n\n<p>Third, call the <code>find_all_books()<\/code> function and display the result sets:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-9\" 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>:\n    <span class=\"hljs-keyword\">try<\/span>:\n        result = find_all_books()\n        print(result)\n    <span class=\"hljs-keyword\">except<\/span> Error <span class=\"hljs-keyword\">as<\/span> e:\n        print(e)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><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<h3 class=\"wp-block-heading\">2) Calling stored procedure and passing arguments<\/h3>\n\n\n\n<p>The following example shows you how to call the\u00a0 <code>find_by_isbn()<\/code> stored procedure:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-10\" 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\">find_book_by_isbn<\/span><span class=\"hljs-params\">(isbn)<\/span>:<\/span>\n    args = (isbn, <span class=\"hljs-number\">0<\/span>)\n    <span class=\"hljs-keyword\">try<\/span>:\n        <span class=\"hljs-comment\"># Read database configuration from the config file<\/span>\n        config = read_config()\n\n        <span class=\"hljs-comment\"># Establish a connection to the MySQL database<\/span>\n        <span class=\"hljs-keyword\">with<\/span> MySQLConnection(**config) <span class=\"hljs-keyword\">as<\/span> conn:\n            <span class=\"hljs-comment\"># Create a cursor to execute SQL queries<\/span>\n            <span class=\"hljs-keyword\">with<\/span> conn.cursor() <span class=\"hljs-keyword\">as<\/span> cursor:\n                <span class=\"hljs-comment\"># Call the stored procedure 'find_by_isbn'<\/span>\n                result_args = cursor.callproc(<span class=\"hljs-string\">'find_by_isbn'<\/span>, args)\n                book_title = result_args&#91;<span class=\"hljs-number\">1<\/span>]\n                <span class=\"hljs-keyword\">return<\/span> book_title\n\n    <span class=\"hljs-keyword\">except<\/span> Error <span class=\"hljs-keyword\">as<\/span> e:\n        print(e)\n        <span class=\"hljs-keyword\">raise<\/span> e\n\n\n<span class=\"hljs-keyword\">if<\/span> __name__ == <span class=\"hljs-string\">'__main__'<\/span>:\n    <span class=\"hljs-keyword\">try<\/span>:\n        result = find_book_by_isbn(<span class=\"hljs-string\">'1236400967773'<\/span>)\n        print(result)\n    <span class=\"hljs-keyword\">except<\/span> Error <span class=\"hljs-keyword\">as<\/span> e:\n        print(e)\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><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>Output:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\">The Giant on the Hill <\/code><\/span><\/pre>\n\n\n<p>In this example, we also use the <code>callproc<\/code> method of the cursor object to call a stored procedure <code>find_by_isbn<\/code>. <\/p>\n\n\n\n<p>Furthermore, we pass an argument to the <code>callproc<\/code> method and get the result back as a list of tuples with the first element as ISBN and the second element as a book title. <\/p>\n\n\n\n<p>The <code>find_book_by_isbn()<\/code> function returns the title of the book specified by the ISBN.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the <code>callproc()<\/code> method of a cursor object to call stored procedures from MySQL in Python programs.<\/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=\"3273\"\n\t\t\t\tdata-post-url=\"https:\/\/www.mysqltutorial.org\/python-mysql\/calling-mysql-stored-procedures-python\/\"\n\t\t\t\tdata-post-title=\"Python MySQL &#8211; Call Stored Procedures in Python\"\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 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