{"id":4160,"date":"2024-03-13T08:02:09","date_gmt":"2024-03-13T08:02:09","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-can-we-perform-a-join-query-operation-in-mybatis\/"},"modified":"2025-07-31T04:08:32","modified_gmt":"2025-07-31T04:08:32","slug":"how-can-we-perform-a-join-query-operation-in-mybatis","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-can-we-perform-a-join-query-operation-in-mybatis\/","title":{"rendered":"MyBatis Join Query Guide"},"content":{"rendered":"<p>When performing join operations in MyBatis, there are various ways to achieve it, such as using tags in the Mapper XML file and annotations, or utilizing annotation-based join queries.<\/p>\n<p>Here is an example of conducting a join query using a Mapper XML file:<\/p>\n<ol>\n<li>Labels and tags, as shown below:<\/li>\n<\/ol>\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\">\"userMap\"<\/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\">id<\/span> <span class=\"hljs-attr\">property<\/span>=<span class=\"hljs-string\">\"id\"<\/span> <span class=\"hljs-attr\">column<\/span>=<span class=\"hljs-string\">\"user_id\"<\/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\">\"username\"<\/span> <span class=\"hljs-attr\">column<\/span>=<span class=\"hljs-string\">\"username\"<\/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\">\"email\"<\/span> <span class=\"hljs-attr\">column<\/span>=<span class=\"hljs-string\">\"email\"<\/span> \/&gt;<\/span>\r\n<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">resultMap<\/span>&gt;<\/span>\r\n\r\n<span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">resultMap<\/span> <span class=\"hljs-attr\">id<\/span>=<span class=\"hljs-string\">\"orderMap\"<\/span> <span class=\"hljs-attr\">type<\/span>=<span class=\"hljs-string\">\"Order\"<\/span>&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">id<\/span> <span class=\"hljs-attr\">property<\/span>=<span class=\"hljs-string\">\"id\"<\/span> <span class=\"hljs-attr\">column<\/span>=<span class=\"hljs-string\">\"order_id\"<\/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\">\"orderNo\"<\/span> <span class=\"hljs-attr\">column<\/span>=<span class=\"hljs-string\">\"order_no\"<\/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\">\"amount\"<\/span> <span class=\"hljs-attr\">column<\/span>=<span class=\"hljs-string\">\"amount\"<\/span> \/&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">association<\/span> <span class=\"hljs-attr\">property<\/span>=<span class=\"hljs-string\">\"user\"<\/span> <span class=\"hljs-attr\">javaType<\/span>=<span class=\"hljs-string\">\"User\"<\/span> <span class=\"hljs-attr\">resultMap<\/span>=<span class=\"hljs-string\">\"userMap\"<\/span> \/&gt;<\/span>\r\n<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">resultMap<\/span>&gt;<\/span>\r\n<\/code><\/pre>\n<ol>\n<li>In SQL statements, use the JOIN operation to connect two tables and map the query results to two entity classes as shown below:<\/li>\n<\/ol>\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\">\"findOrderById\"<\/span> <span class=\"hljs-attr\">parameterType<\/span>=<span class=\"hljs-string\">\"int\"<\/span> <span class=\"hljs-attr\">resultMap<\/span>=<span class=\"hljs-string\">\"orderMap\"<\/span>&gt;<\/span>\r\n    SELECT o.*, u.user_id, u.username, u.email\r\n    FROM orders o\r\n    INNER JOIN users u\r\n    ON o.user_id = u.user_id\r\n    WHERE o.order_id = #{orderId}\r\n<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">select<\/span>&gt;<\/span>\r\n<\/code><\/pre>\n<ol>\n<li>Define a query method in the corresponding Mapper interface and call the corresponding SQL statement in the method as shown below:<\/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_\">OrderMapper<\/span> {\r\n    Order <span class=\"hljs-title function_\">findOrderById<\/span><span class=\"hljs-params\">(<span class=\"hljs-type\">int<\/span> orderId)<\/span>;\r\n}\r\n<\/code><\/pre>\n<p>By following the above steps, you can perform join operations in MyBatis. Alternatively, you can also use annotation to perform join queries, for more details please refer to the official MyBatis documentation.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>When performing join operations in MyBatis, there are various ways to achieve it, such as using tags in the Mapper XML file and annotations, or utilizing annotation-based join queries. Here is an example of conducting a join query using a Mapper XML file: Labels and tags, as shown below: &lt;resultMap id=&#8221;userMap&#8221; type=&#8221;User&#8221;&gt; &lt;id property=&#8221;id&#8221; column=&#8221;user_id&#8221; [&hellip;]<\/p>\n","protected":false},"author":6,"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":[3450,2688,3449,1459,3451],"class_list":["post-4160","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-database-mapper","tag-java-persistence","tag-join-query","tag-mybatis","tag-sql-joins"],"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 Join Query Guide - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to perform join operations in MyBatis using XML mappers and annotations with examples.\" \/>\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-can-we-perform-a-join-query-operation-in-mybatis\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MyBatis Join Query Guide\" \/>\n<meta property=\"og:description\" content=\"Learn how to perform join operations in MyBatis using XML mappers and annotations with examples.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/how-can-we-perform-a-join-query-operation-in-mybatis\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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