{"id":527,"date":"2009-12-27T13:19:32","date_gmt":"2009-12-27T13:19:32","guid":{"rendered":"http:\/\/www.mysqltutorial.org\/?page_id=527"},"modified":"2023-11-29T20:59:02","modified_gmt":"2023-11-30T03:59:02","slug":"stored-procedures-parameters-in-mysql","status":"publish","type":"page","link":"https:\/\/www.mysqltutorial.org\/mysql-stored-procedure\/stored-procedures-parameters-in-mysql\/","title":{"rendered":"MySQL Stored Procedure Parameters"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to create stored procedures with parameters, including <code>IN<\/code>, <code>OUT<\/code>, and <code>INTOUT<\/code> parameters.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to MySQL stored procedure parameters<\/h2>\n\n\n\n<p>Typically, <a href=\"https:\/\/www.mysqltutorial.org\/mysql-stored-procedure\/getting-started-with-mysql-stored-procedures\/\">stored procedures<\/a> have parameters, making them more useful and reusable. <\/p>\n\n\n\n<p>A parameter in a stored procedure has one of three modes: <code>IN<\/code>, <code>OUT<\/code>,&nbsp;or <code>INOUT<\/code>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">IN parameters<\/h3>\n\n\n\n<p><code>IN<\/code> is the default mode. When defining an <code>IN<\/code> parameter in a stored procedure, the calling program must pass an argument to the stored procedure. <\/p>\n\n\n\n<p>Additionally, the value of an <code>IN<\/code> parameter is protected. This means that even if you change the value of the <code>IN<\/code> parameter inside the stored procedure, its original value remains unchanged after the stored procedure ends. In other words, the stored procedure works only on the copy of the <code>IN<\/code> parameter.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">OUT parameters<\/h3>\n\n\n\n<p>The value of an <code>OUT<\/code> parameter can be modified within the stored procedure, and its updated value is then passed back to the calling program. <\/p>\n\n\n\n<p class=\"note\">Note that stored procedures cannot access the initial value of the <code>OUT<\/code> parameter when they begin.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">INOUT parameters<\/h3>\n\n\n\n<p>An <code>INOUT<\/code> &nbsp;parameter is a combination of <code>IN<\/code> and <code>OUT<\/code> parameters. This means that the calling program may pass the argument, and the stored procedure can modify the <code>INOUT<\/code> parameter and pass the new value back to the calling program.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Defining a parameter<\/h3>\n\n\n\n<p>Here is the basic syntax for defining a parameter in stored procedures:<\/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\">&#91;IN | OUT | INOUT] parameter_name datatype&#91;(length)]<\/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>In this syntax,<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>First, specify the parameter mode, which can be <code>IN<\/code> , <code>OUT<\/code> or <code>INOUT<\/code> depending on the purpose of the parameter in the stored procedure.<\/li>\n\n\n\n<li>Second, provide the name of the parameter. The parameter name must follow the naming rules of the column name in MySQL.<\/li>\n\n\n\n<li>Third, define the data type and maximum length of the parameter.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">MySQL stored procedure parameter examples<\/h2>\n\n\n\n<p>Let&#8217;s explore some examples of using stored procedure parameters.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">The IN parameter example<\/h3>\n\n\n\n<p>The following example creates a stored procedure that finds all offices that are located in a country specified by the input parameter <code>countryName<\/code>:<\/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\">DELIMITER \/\/\n\n<span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">PROCEDURE<\/span> GetOfficeByCountry(\n\t<span class=\"hljs-keyword\">IN<\/span> countryName <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> * \n \t<span class=\"hljs-keyword\">FROM<\/span> offices\n\t<span class=\"hljs-keyword\">WHERE<\/span> country = countryName;\n<span class=\"hljs-keyword\">END<\/span> \/\/\n\nDELIMITER ;<\/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<p>In this example, the <code>countryName<\/code> is the <code>IN<\/code> parameter of the stored procedure.<\/p>\n\n\n\n<p>Suppose that you want to find offices located in the USA, you need to pass an argument (<code>USA<\/code>) to the stored procedure as shown in the following query:<\/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\"><span class=\"hljs-keyword\">CALL<\/span> GetOfficeByCountry(<span class=\"hljs-string\">'USA'<\/span>);<\/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<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"696\" height=\"82\" src=\"https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2009\/12\/MySQL-Stored-Procedure-Param.png\" alt=\"MySQL Stored Procedure Parameters\" class=\"wp-image-5165\" title=\"MySQL Stored Procedure Parameters - IN parameter example\" srcset=\"https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2009\/12\/MySQL-Stored-Procedure-Param.png 696w, https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2009\/12\/MySQL-Stored-Procedure-Param-300x35.png 300w\" sizes=\"auto, (max-width: 696px) 100vw, 696px\" \/><\/figure>\n\n\n\n<p>To find offices in <code>France<\/code>, you pass the literal string <code>France<\/code> to the <code>GetOfficeByCountry<\/code>&nbsp;stored procedure as follows:<\/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> GetOfficeByCountry(<span class=\"hljs-string\">'France'<\/span>)<\/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<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"682\" height=\"46\" src=\"https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2009\/12\/MySQL-IN-parameter-offices-in-France.png\" alt=\"\" class=\"wp-image-5167\" title=\"IN parameter offices in France\" srcset=\"https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2009\/12\/MySQL-IN-parameter-offices-in-France.png 682w, https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2009\/12\/MySQL-IN-parameter-offices-in-France-300x20.png 300w\" sizes=\"auto, (max-width: 682px) 100vw, 682px\" \/><\/figure>\n\n\n\n<p>Because the <code>countryName<\/code> is the <code>IN<\/code> parameter, you must pass an argument. If you don&#8217;t do so, you&#8217;ll get an error:<\/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-keyword\">CALL<\/span> GetOfficeByCountry();<\/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<p>Here&#8217;s the error:<\/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-built_in\">Error<\/span> Code: <span class=\"hljs-number\">1318.<\/span> Incorrect number <span class=\"hljs-keyword\">of<\/span> <span class=\"hljs-built_in\">arguments<\/span> <span class=\"hljs-keyword\">for<\/span> PROCEDURE classicmodels.GetOfficeByCountry; expected <span class=\"hljs-number\">1<\/span>, got <span class=\"hljs-number\">0<\/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<h3 class=\"wp-block-heading\">The OUT parameter example<\/h3>\n\n\n\n<p>The following defines a stored procedure that returns the number of orders based on their order status.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">DELIMITER $$\n\n<span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">PROCEDURE<\/span> GetOrderCountByStatus (\n\t<span class=\"hljs-keyword\">IN<\/span>  orderStatus <span class=\"hljs-built_in\">VARCHAR<\/span>(<span class=\"hljs-number\">25<\/span>),\n\t<span class=\"hljs-keyword\">OUT<\/span> total <span class=\"hljs-built_in\">INT<\/span>\n)\n<span class=\"hljs-keyword\">BEGIN<\/span>\n\t<span class=\"hljs-keyword\">SELECT<\/span> <span class=\"hljs-keyword\">COUNT<\/span>(orderNumber)\n\t<span class=\"hljs-keyword\">INTO<\/span> total\n\t<span class=\"hljs-keyword\">FROM<\/span> orders\n\t<span class=\"hljs-keyword\">WHERE<\/span> <span class=\"hljs-keyword\">status<\/span> = orderStatus;\n<span class=\"hljs-keyword\">END<\/span>$$\n\nDELIMITER ;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><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 stored procedure <code>GetOrderCountByStatus()<\/code>&nbsp;has two parameters:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The <code>orderStatus<\/code> is the <code>IN<\/code> parameter specifies the status of orders to return.<\/li>\n\n\n\n<li>The <code>total<\/code> is the <code>OUT<\/code> parameter that stores the number of orders in a specific status.<\/li>\n<\/ul>\n\n\n\n<p>To find the number of orders that already shipped, you call <code>GetOrderCountByStatus<\/code> and pass the order status as of <code>Shipped<\/code>, and also pass a <a href=\"https:\/\/www.mysqltutorial.org\/mysql-basics\/mysql-variables\/\">session variable<\/a> ( <code>@total<\/code> ) to receive the return value.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" 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> GetOrderCountByStatus(<span class=\"hljs-string\">'Shipped'<\/span>,@total);\n<span class=\"hljs-keyword\">SELECT<\/span> @total;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><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>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\">+--------+\r\n| @total |\r\n+--------+\r\n|    <span class=\"hljs-number\">303<\/span> |\r\n+--------+\r\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>To get the number of orders that are in process, you call the stored procedure <code>GetOrderCountByStatus<\/code>\u00a0as follows:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-10\" 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> GetOrderCountByStatus(<span class=\"hljs-string\">'In Process'<\/span>,@total);\n<span class=\"hljs-keyword\">SELECT<\/span> @total <span class=\"hljs-keyword\">AS<\/span> total_in_process;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><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>Output:<\/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\">+------------------+\r\n| total_in_process |\r\n+------------------+\r\n|                <span class=\"hljs-number\">6<\/span> |\r\n+------------------+\r\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-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<h3 class=\"wp-block-heading\">The INOUT parameter example<\/h3>\n\n\n\n<p>The following example demonstrates how to use an&nbsp;<code>INOUT<\/code> parameter in a stored procedure:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-12\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">DELIMITER $$\n\n<span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">PROCEDURE<\/span> SetCounter(\n\tINOUT counter <span class=\"hljs-built_in\">INT<\/span>,\n    <span class=\"hljs-keyword\">IN<\/span> inc <span class=\"hljs-built_in\">INT<\/span>\n)\n<span class=\"hljs-keyword\">BEGIN<\/span>\n\t<span class=\"hljs-keyword\">SET<\/span> counter = counter + inc;\n<span class=\"hljs-keyword\">END<\/span>$$\n\nDELIMITER ;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-12\"><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>In this example, the stored procedure <code>SetCounter()<\/code> accepts one <code>INOUT<\/code>&nbsp;parameter ( <code>counter<\/code> ) and one <code>IN<\/code> parameter ( <code>inc<\/code> ). It increases the counter ( <code>counter<\/code> ) by the value specified by the <code>inc<\/code> parameter.<\/p>\n\n\n\n<p>These statements illustrate how to call the <code>SetSounter<\/code>&nbsp;stored procedure:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-13\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SET<\/span> @counter = <span class=\"hljs-number\">1<\/span>;\n<span class=\"hljs-keyword\">CALL<\/span> SetCounter(@counter,<span class=\"hljs-number\">1<\/span>); <span class=\"hljs-comment\">-- 2<\/span>\n<span class=\"hljs-keyword\">CALL<\/span> SetCounter(@counter,<span class=\"hljs-number\">1<\/span>); <span class=\"hljs-comment\">-- 3<\/span>\n<span class=\"hljs-keyword\">CALL<\/span> SetCounter(@counter,<span class=\"hljs-number\">5<\/span>); <span class=\"hljs-comment\">-- 8<\/span>\n<span class=\"hljs-keyword\">SELECT<\/span> @counter; <span class=\"hljs-comment\">-- 8<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-13\"><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\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"82\" height=\"39\" src=\"https:\/\/www.mysqltutorial.org\/wp-content\/uploads\/2019\/09\/MySQL-Stored-Procedure-Parameter-INOUT.png\" alt=\"\" class=\"wp-image-8279\"\/><\/figure>\n\n\n\n<p>In this tutorial, you have learned how to create stored procedures with parameters including <code>IN<\/code>, <code>OUT<\/code>, and <code>INOUT<\/code> parameters.<\/p>\n<div class=\"helpful-block-content\" data-title=\"\">\n\t<header>\n\t\t<div class=\"wth-question\">Was 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