{"id":27047,"date":"2024-03-16T07:46:54","date_gmt":"2024-03-16T07:46:54","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-does-mybatis-accept-map-parameters\/"},"modified":"2024-03-22T10:04:37","modified_gmt":"2024-03-22T10:04:37","slug":"how-does-mybatis-accept-map-parameters","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-does-mybatis-accept-map-parameters\/","title":{"rendered":"How does MyBatis accept map parameters?"},"content":{"rendered":"<p>In MyBatis, you can receive Map type parameters using the @Param annotation and the #{} placeholder.<\/p>\n<p>Firstly, use the #{key} placeholder in the SQL statement to reference the value in the Map. For example:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">select<\/span> <span class=\"hljs-attr\">id<\/span>=<span class=\"hljs-string\">\"selectUser\"<\/span> <span class=\"hljs-attr\">resultType<\/span>=<span class=\"hljs-string\">\"User\"<\/span>&gt;<\/span>\r\n  SELECT * FROM user WHERE id = #{id} AND name = #{name}\r\n<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">select<\/span>&gt;<\/span>\r\n<\/code><\/pre>\n<p>Next, use the @Param annotation in the method parameters to identify parameters of type Map and use the keys from the Map in the #{} placeholders. For example:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">@Select(\"SELECT * FROM user WHERE id = #{id} AND name = #{name}\")<\/span>\r\nUser <span class=\"hljs-title function_\">selectUser<\/span><span class=\"hljs-params\">(<span class=\"hljs-meta\">@Param(\"id\")<\/span> <span class=\"hljs-type\">int<\/span> id, <span class=\"hljs-meta\">@Param(\"name\")<\/span> String name)<\/span>;\r\n<\/code><\/pre>\n<p>If the parameter is a complex Map object, you can specify the parameter name using the @Param annotation, and then reference the values in the Map using #{paramName.key} in the SQL statement. For example:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">@Select(\"SELECT * FROM user WHERE id = #{param.mapKey} AND name = #{param.mapValue}\")<\/span>\r\nUser <span class=\"hljs-title function_\">selectUser<\/span><span class=\"hljs-params\">(<span class=\"hljs-meta\">@Param(\"param\")<\/span> Map&lt;String, Object&gt; paramMap)<\/span>;\r\n<\/code><\/pre>\n<p>When calling a method, you can pass a Map parameter that includes key-value pairs. For example:<\/p>\n<pre class=\"post-pre\"><code>Map&lt;String, Object&gt; paramMap = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">HashMap<\/span>&lt;&gt;();\r\nparamMap.put(<span class=\"hljs-string\">\"id\"<\/span>, <span class=\"hljs-number\">1<\/span>);\r\nparamMap.put(<span class=\"hljs-string\">\"name\"<\/span>, <span class=\"hljs-string\">\"Alice\"<\/span>);\r\n\r\n<span class=\"hljs-type\">User<\/span> <span class=\"hljs-variable\">user<\/span> <span class=\"hljs-operator\">=<\/span> userDao.selectUser(paramMap);\r\n<\/code><\/pre>\n<p>Please be aware that when using the @Param annotation in XML configuration files, you need to set useActualParamName to true so that MyBatis can correctly parse the parameter names. For example:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">settings<\/span>&gt;<\/span>\r\n  <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">setting<\/span> <span class=\"hljs-attr\">name<\/span>=<span class=\"hljs-string\">\"useActualParamName\"<\/span> <span class=\"hljs-attr\">value<\/span>=<span class=\"hljs-string\">\"true\"<\/span> \/&gt;<\/span>\r\n<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">settings<\/span>&gt;<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>In MyBatis, you can receive Map type parameters using the @Param annotation and the #{} placeholder. Firstly, use the #{key} placeholder in the SQL statement to reference the value in the Map. For example: &lt;select id=&#8221;selectUser&#8221; resultType=&#8221;User&#8221;&gt; SELECT * FROM user WHERE id = #{id} AND name = #{name} &lt;\/select&gt; Next, use the @Param annotation [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-27047","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How does MyBatis accept map parameters? - Blog - Silicon Cloud<\/title>\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.silicloud.com\/blog\/how-does-mybatis-accept-map-parameters\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How does MyBatis accept map parameters?\" \/>\n<meta property=\"og:description\" content=\"In MyBatis, you can receive Map type parameters using the @Param annotation and the #{} placeholder. 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