{"id":6434,"date":"2024-03-14T04:14:35","date_gmt":"2024-03-14T04:14:35","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-do-you-create-a-mapper-in-mybatis\/"},"modified":"2025-08-02T03:34:42","modified_gmt":"2025-08-02T03:34:42","slug":"how-do-you-create-a-mapper-in-mybatis","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-do-you-create-a-mapper-in-mybatis\/","title":{"rendered":"Create MyBatis Mappers: Complete Guide"},"content":{"rendered":"<p>Creating a mapper in MyBatis usually involves the following steps:<\/p>\n<ol>\n<li>Create a mapper interface: Start by creating an interface with the typical naming convention of xxxMapper, where xxx represents the name of the corresponding data table or entity class.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">interface<\/span> <span class=\"hljs-title class_\">UserMapper<\/span> {\r\n    User <span class=\"hljs-title function_\">selectUserById<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> userId)<\/span>;\r\n    <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">insertUser<\/span><span class=\"hljs-params\">(User user)<\/span>;\r\n    <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">updateUser<\/span><span class=\"hljs-params\">(User user)<\/span>;\r\n    <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">deleteUser<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> userId)<\/span>;\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>Create a mapper XML file: Create a XML file with the same name as the mapper interface in the resources directory, to write SQL statements and mapping relationships.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">&lt;?xml version=<span class=\"hljs-string\">\"1.0\"<\/span> encoding=<span class=\"hljs-string\">\"UTF-8\"<\/span> ?&gt;<\/span>\r\n<span class=\"hljs-meta\">&lt;!DOCTYPE <span class=\"hljs-keyword\">mapper<\/span> <span class=\"hljs-keyword\">PUBLIC<\/span> <span class=\"hljs-string\">\"-\/\/mybatis.org\/\/DTD Mapper 3.0\/\/EN\"<\/span>\r\n<span class=\"hljs-string\">\"http:\/\/mybatis.org\/dtd\/mybatis-3-mapper.dtd\"<\/span>&gt;<\/span>\r\n<span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">mapper<\/span> <span class=\"hljs-attr\">namespace<\/span>=<span class=\"hljs-string\">\"com.example.mapper.UserMapper\"<\/span>&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">select<\/span> <span class=\"hljs-attr\">id<\/span>=<span class=\"hljs-string\">\"selectUserById\"<\/span> <span class=\"hljs-attr\">parameterType<\/span>=<span class=\"hljs-string\">\"int\"<\/span> <span class=\"hljs-attr\">resultType<\/span>=<span class=\"hljs-string\">\"com.example.model.User\"<\/span>&gt;<\/span>\r\n        SELECT * FROM user WHERE id = #{userId}\r\n    <span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">select<\/span>&gt;<\/span>\r\n    \r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">insert<\/span> <span class=\"hljs-attr\">id<\/span>=<span class=\"hljs-string\">\"insertUser\"<\/span> <span class=\"hljs-attr\">parameterType<\/span>=<span class=\"hljs-string\">\"com.example.model.User\"<\/span>&gt;<\/span>\r\n        INSERT INTO user (id, name, age) VALUES (#{id}, #{name}, #{age})\r\n    <span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">insert<\/span>&gt;<\/span>\r\n    \r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">update<\/span> <span class=\"hljs-attr\">id<\/span>=<span class=\"hljs-string\">\"updateUser\"<\/span> <span class=\"hljs-attr\">parameterType<\/span>=<span class=\"hljs-string\">\"com.example.model.User\"<\/span>&gt;<\/span>\r\n        UPDATE user SET name = #{name}, age = #{age} WHERE id = #{id}\r\n    <span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">update<\/span>&gt;<\/span>\r\n    \r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">delete<\/span> <span class=\"hljs-attr\">id<\/span>=<span class=\"hljs-string\">\"deleteUser\"<\/span> <span class=\"hljs-attr\">parameterType<\/span>=<span class=\"hljs-string\">\"int\"<\/span>&gt;<\/span>\r\n        DELETE FROM user WHERE id = #{userId}\r\n    <span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">delete<\/span>&gt;<\/span>\r\n<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">mapper<\/span>&gt;<\/span>\r\n<\/code><\/pre>\n<ol>\n<li>Configure Mapper interface and XML file: Add the scanning and configuration of mapper in MyBatis configuration file (usually mybatis-config.xml).<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">configuration<\/span>&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">mappers<\/span>&gt;<\/span>\r\n        <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">mapper<\/span> <span class=\"hljs-attr\">resource<\/span>=<span class=\"hljs-string\">\"com\/example\/mapper\/UserMapper.xml\"<\/span>\/&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">mappers<\/span>&gt;<\/span>\r\n<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">configuration<\/span>&gt;<\/span>\r\n<\/code><\/pre>\n<ol>\n<li>Use mapper: In the code, retrieve the implementation of the mapper interface through MyBatis&#8217;s SqlSession object, and then invoke the methods in the interface to execute database operations.<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-type\">SqlSession<\/span> <span class=\"hljs-variable\">sqlSession<\/span> <span class=\"hljs-operator\">=<\/span> sqlSessionFactory.openSession();\r\n<span class=\"hljs-type\">UserMapper<\/span> <span class=\"hljs-variable\">userMapper<\/span> <span class=\"hljs-operator\">=<\/span> sqlSession.getMapper(UserMapper.class);\r\n\r\n<span class=\"hljs-type\">User<\/span> <span class=\"hljs-variable\">user<\/span> <span class=\"hljs-operator\">=<\/span> userMapper.selectUserById(<span class=\"hljs-number\">1<\/span>);\r\nuser.setAge(<span class=\"hljs-number\">30<\/span>);\r\nuserMapper.updateUser(user);\r\n\r\nsqlSession.commit();\r\nsqlSession.close();\r\n<\/code><\/pre>\n<p>By following the above steps, you can create a mapper in MyBatis and start using it.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Creating a mapper in MyBatis usually involves the following steps: Create a mapper interface: Start by creating an interface with the typical naming convention of xxxMapper, where xxx represents the name of the corresponding data table or entity class. public interface UserMapper { User selectUserById(int userId); void insertUser(User user); void updateUser(User user); void deleteUser(int userId); [&hellip;]<\/p>\n","protected":false},"author":10,"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":[284,2688,7733,1459,3134],"class_list":["post-6434","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-database","tag-java-persistence","tag-mapper","tag-mybatis","tag-sql-mapping"],"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>Create MyBatis Mappers: Complete Guide - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to create MyBatis mappers with our comprehensive guide. 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