{"id":17559,"date":"2024-03-15T15:12:38","date_gmt":"2024-03-15T15:12:38","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-can-we-dynamically-add-fields-to-mybatis-interceptors\/"},"modified":"2024-03-21T11:11:43","modified_gmt":"2024-03-21T11:11:43","slug":"how-can-we-dynamically-add-fields-to-mybatis-interceptors","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-can-we-dynamically-add-fields-to-mybatis-interceptors\/","title":{"rendered":"How can we dynamically add fields to MyBatis interceptors?"},"content":{"rendered":"<p>MyBatis interceptors are tools used to process parameters or results before or after executing SQL statements. To dynamically add fields, you can follow the steps below:<\/p>\n<ol>\n<li>The person or thing that intercepts.<\/li>\n<li>capture the signal<\/li>\n<li>extension<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">MyInterceptor<\/span> <span class=\"hljs-keyword\">implements<\/span> <span class=\"hljs-title class_\">Interceptor<\/span> {\r\n    <span class=\"hljs-meta\">@Override<\/span>\r\n    <span class=\"hljs-keyword\">public<\/span> Object <span class=\"hljs-title function_\">intercept<\/span><span class=\"hljs-params\">(Invocation invocation)<\/span> <span class=\"hljs-keyword\">throws<\/span> Throwable {\r\n        <span class=\"hljs-comment\">\/\/ \u5728\u6b64\u5904\u8fdb\u884c\u5b57\u6bb5\u7684\u52a8\u6001\u6dfb\u52a0<\/span>\r\n        <span class=\"hljs-comment\">\/\/ ...<\/span>\r\n        <span class=\"hljs-keyword\">return<\/span> invocation.proceed();\r\n    }\r\n\r\n    <span class=\"hljs-meta\">@Override<\/span>\r\n    <span class=\"hljs-keyword\">public<\/span> Object <span class=\"hljs-title function_\">plugin<\/span><span class=\"hljs-params\">(Object target)<\/span> {\r\n        <span class=\"hljs-keyword\">return<\/span> Plugin.wrap(target, <span class=\"hljs-built_in\">this<\/span>);\r\n    }\r\n\r\n    <span class=\"hljs-meta\">@Override<\/span>\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">setProperties<\/span><span class=\"hljs-params\">(Properties properties)<\/span> {\r\n        <span class=\"hljs-comment\">\/\/ \u53ef\u4ee5\u5728\u6b64\u5904\u8bbe\u7f6e\u4e00\u4e9b\u5c5e\u6027<\/span>\r\n    }\r\n}\r\n<\/code><\/pre>\n<ol>\n<li>Settings or options for setup<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">plugins<\/span>&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">plugin<\/span> <span class=\"hljs-attr\">interceptor<\/span>=<span class=\"hljs-string\">\"com.example.MyInterceptor\"<\/span>&gt;<\/span>\r\n        <span class=\"hljs-comment\">&lt;!-- \u8bbe\u7f6e\u4e00\u4e9b\u5c5e\u6027 --&gt;<\/span>\r\n    <span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">plugin<\/span>&gt;<\/span>\r\n<span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">plugins<\/span>&gt;<\/span>\r\n<\/code><\/pre>\n<ol>\n<li>catch or stop something before it reaches its intended destination<\/li>\n<li>calling upon a higher power<\/li>\n<li>An object that provides metadata<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-meta\">@Override<\/span>\r\n<span class=\"hljs-keyword\">public<\/span> Object <span class=\"hljs-title function_\">intercept<\/span><span class=\"hljs-params\">(Invocation invocation)<\/span> <span class=\"hljs-keyword\">throws<\/span> Throwable {\r\n    <span class=\"hljs-comment\">\/\/ \u83b7\u53d6\u65b9\u6cd5\u53c2\u6570<\/span>\r\n    Object[] args = invocation.getArgs();\r\n    <span class=\"hljs-comment\">\/\/ \u83b7\u53d6SQL\u8bed\u53e5\u7684\u5143\u6570\u636e<\/span>\r\n    <span class=\"hljs-type\">MappedStatement<\/span> <span class=\"hljs-variable\">ms<\/span> <span class=\"hljs-operator\">=<\/span> (MappedStatement) args[<span class=\"hljs-number\">0<\/span>];\r\n    <span class=\"hljs-comment\">\/\/ \u83b7\u53d6SQL\u8bed\u53e5\u7684\u7c7b\u578b<\/span>\r\n    <span class=\"hljs-type\">SqlCommandType<\/span> <span class=\"hljs-variable\">commandType<\/span> <span class=\"hljs-operator\">=<\/span> ms.getSqlCommandType();\r\n    \r\n    <span class=\"hljs-keyword\">if<\/span> (commandType == SqlCommandType.INSERT || commandType == SqlCommandType.UPDATE) {\r\n        <span class=\"hljs-comment\">\/\/ \u83b7\u53d6\u53c2\u6570\u5bf9\u8c61<\/span>\r\n        <span class=\"hljs-type\">Object<\/span> <span class=\"hljs-variable\">parameter<\/span> <span class=\"hljs-operator\">=<\/span> args[<span class=\"hljs-number\">1<\/span>];\r\n        <span class=\"hljs-keyword\">if<\/span> (parameter != <span class=\"hljs-literal\">null<\/span>) {\r\n            <span class=\"hljs-comment\">\/\/ \u4f7f\u7528MetaObject\u5bf9\u53c2\u6570\u5bf9\u8c61\u8fdb\u884c\u5c01\u88c5<\/span>\r\n            <span class=\"hljs-type\">MetaObject<\/span> <span class=\"hljs-variable\">metaObject<\/span> <span class=\"hljs-operator\">=<\/span> SystemMetaObject.forObject(parameter);\r\n            <span class=\"hljs-comment\">\/\/ \u52a8\u6001\u6dfb\u52a0\u5b57\u6bb5<\/span>\r\n            metaObject.setValue(<span class=\"hljs-string\">\"fieldName\"<\/span>, value);\r\n        }\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">return<\/span> invocation.proceed();\r\n}\r\n<\/code><\/pre>\n<p>Note: The above code is just an example, adjustments should be made according to specific business requirements when actually used.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>MyBatis interceptors are tools used to process parameters or results before or after executing SQL statements. To dynamically add fields, you can follow the steps below: The person or thing that intercepts. capture the signal extension public class MyInterceptor implements Interceptor { @Override public Object intercept(Invocation invocation) throws Throwable { \/\/ \u5728\u6b64\u5904\u8fdb\u884c\u5b57\u6bb5\u7684\u52a8\u6001\u6dfb\u52a0 \/\/ &#8230; return [&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-17559","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 can we dynamically add fields to MyBatis interceptors? - 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-can-we-dynamically-add-fields-to-mybatis-interceptors\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How can we dynamically add fields to MyBatis interceptors?\" \/>\n<meta property=\"og:description\" content=\"MyBatis interceptors are tools used to process parameters or results before or after executing SQL statements. To dynamically add fields, you can follow the steps below: The person or thing that intercepts. capture the signal extension public class MyInterceptor implements Interceptor { @Override public Object intercept(Invocation invocation) throws Throwable { \/\/ \u5728\u6b64\u5904\u8fdb\u884c\u5b57\u6bb5\u7684\u52a8\u6001\u6dfb\u52a0 \/\/ ... return [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/how-can-we-dynamically-add-fields-to-mybatis-interceptors\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/SiliCloudGlobal\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-15T15:12:38+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-21T11:11:43+00:00\" \/>\n<meta name=\"author\" content=\"Olivia Parker\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:site\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Olivia Parker\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-can-we-dynamically-add-fields-to-mybatis-interceptors\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-can-we-dynamically-add-fields-to-mybatis-interceptors\/\"},\"author\":{\"name\":\"Olivia Parker\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/3ff7b3da0e45ac5dbbef2502f3cea8d9\"},\"headline\":\"How can we dynamically add fields to MyBatis interceptors?\",\"datePublished\":\"2024-03-15T15:12:38+00:00\",\"dateModified\":\"2024-03-21T11:11:43+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-can-we-dynamically-add-fields-to-mybatis-interceptors\/\"},\"wordCount\":90,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#organization\"},\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-can-we-dynamically-add-fields-to-mybatis-interceptors\/\",\"url\":\"https:\/\/www.silicloud.com\/blog\/how-can-we-dynamically-add-fields-to-mybatis-interceptors\/\",\"name\":\"How can we dynamically add fields to MyBatis interceptors? 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