{"id":7937,"date":"2024-03-14T07:21:27","date_gmt":"2024-03-14T07:21:27","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/what-is-the-method-for-setting-null-values-in-mybatis\/"},"modified":"2025-08-02T22:38:37","modified_gmt":"2025-08-02T22:38:37","slug":"what-is-the-method-for-setting-null-values-in-mybatis","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/what-is-the-method-for-setting-null-values-in-mybatis\/","title":{"rendered":"MyBatis Null Value Handling Guide"},"content":{"rendered":"<p>In MyBatis, the nullValue attribute can be used to set the method for handling empty values. This attribute can be used in the <result> or <parameter> tags in mapping files to specify a default value when the query result is null. For example:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">resultMap<\/span> <span class=\"hljs-attr\">id<\/span>=<span class=\"hljs-string\">\"userResultMap\"<\/span> <span class=\"hljs-attr\">type<\/span>=<span class=\"hljs-string\">\"User\"<\/span>&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">result<\/span> <span class=\"hljs-attr\">property<\/span>=<span class=\"hljs-string\">\"id\"<\/span> <span class=\"hljs-attr\">column<\/span>=<span class=\"hljs-string\">\"id\"<\/span> <span class=\"hljs-attr\">nullValue<\/span>=<span class=\"hljs-string\">\"0\"<\/span> \/&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">result<\/span> <span class=\"hljs-attr\">property<\/span>=<span class=\"hljs-string\">\"name\"<\/span> <span class=\"hljs-attr\">column<\/span>=<span class=\"hljs-string\">\"name\"<\/span> <span class=\"hljs-attr\">nullValue<\/span>=<span class=\"hljs-string\">\"Unknown\"<\/span> \/&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">result<\/span> <span class=\"hljs-attr\">property<\/span>=<span class=\"hljs-string\">\"age\"<\/span> <span class=\"hljs-attr\">column<\/span>=<span class=\"hljs-string\">\"age\"<\/span> <span class=\"hljs-attr\">nullValue<\/span>=<span class=\"hljs-string\">\"-1\"<\/span> \/&gt;<\/span>\r\n<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">resultMap<\/span>&gt;<\/span>\r\n<\/code><\/pre>\n<p>In the example above, if a field in the query result is null, MyBatis will set the value of that field to 0, Unknown, or -1 instead of keeping it as null.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In MyBatis, the nullValue attribute can be used to set the method for handling empty values. This attribute can be used in the or tags in mapping files to specify a default value when the query result is null. For example: &lt;resultMap id=&#8221;userResultMap&#8221; type=&#8221;User&#8221;&gt; &lt;result property=&#8221;id&#8221; column=&#8221;id&#8221; nullValue=&#8221;0&#8243; \/&gt; &lt;result property=&#8221;name&#8221; column=&#8221;name&#8221; nullValue=&#8221;Unknown&#8221; \/&gt; &lt;result [&hellip;]<\/p>\n","protected":false},"author":13,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[2797,1459,2742,345,10388],"class_list":["post-7937","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-java-orm","tag-mybatis","tag-mybatis-tutorial","tag-null-handling","tag-nullvalue"],"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>MyBatis Null Value Handling Guide - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to set default values for nulls in MyBatis using nullValue attribute. Clear examples included.\" \/>\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\/what-is-the-method-for-setting-null-values-in-mybatis\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MyBatis Null Value Handling Guide\" \/>\n<meta property=\"og:description\" content=\"Learn how to set default values for nulls in MyBatis using nullValue attribute. 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