{"id":27042,"date":"2024-03-16T07:46:22","date_gmt":"2024-03-16T07:46:22","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-retrieve-values-from-a-map-returned-by-mybatis\/"},"modified":"2024-03-22T10:03:53","modified_gmt":"2024-03-22T10:03:53","slug":"how-to-retrieve-values-from-a-map-returned-by-mybatis","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-retrieve-values-from-a-map-returned-by-mybatis\/","title":{"rendered":"How to retrieve values from a map returned by MyBatis?"},"content":{"rendered":"

When MyBatis returns a Map, you can retrieve the values using the following methods:<\/p>\n

    \n
  1. Retrieve a value based on a key: use the `get(key)` method, where `key` is the key in the Map. For example, if the key of the Map is “username”, you can use `get(“username”)` to retrieve the corresponding value.<\/li>\n
  2. Iterate through a Map: retrieve a set of key-value pairs in the Map using the entrySet() method, and then iterate through the set to access the keys and values. For example:<\/li>\n<\/ol>\n
    Map<String, Object> resultMap = sqlSession.selectOne(\"selectUserById\"<\/span>, 1<\/span>);\r\nfor<\/span> (Map.Entry<String, Object> entry : resultMap.entrySet()) {\r\n    String<\/span> key<\/span> =<\/span> entry.getKey();\r\n    Object<\/span> value<\/span> =<\/span> entry.getValue();\r\n    \/\/ \u8fdb\u884c\u76f8\u5e94\u7684\u5904\u7406<\/span>\r\n}\r\n<\/code><\/pre>\n
      \n
    1. By using annotations: If you choose to use annotations, you can simply use the @Param annotation to specify the key in the Map, and then retrieve the value using the parameter name. For example:<\/li>\n<\/ol>\n
      @Select(\"SELECT * FROM user WHERE id = #{map.id}\")<\/span>\r\nUser selectUserById<\/span>(@Param(\"map\")<\/span> Map<String, Object> map)<\/span>;\r\n<\/code><\/pre>\n
      In the example above, you can use map.id to retrieve the value corresponding to the id key in the Map.<\/p>\n
      In general, there are two common ways to retrieve values from a Map: by accessing key-value pairs and by iterating through the Map. The choice of which method to use depends on specific business requirements and code implementation.<\/p>\n","protected":false},"excerpt":{"rendered":"
      When MyBatis returns a Map, you can retrieve the values using the following methods: Retrieve a value based on a key: use the `get(key)` method, where `key` is the key in the Map. For example, if the key of the Map is “username”, you can use `get(“username”)` to retrieve the corresponding value. Iterate through a […]<\/p>\n","protected":false},"author":5,"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-27042","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nHow to retrieve values from a map returned by MyBatis? - 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-to-retrieve-values-from-a-map-returned-by-mybatis\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to retrieve values from a map returned by MyBatis?\" \/>\n<meta property=\"og:description\" content=\"When MyBatis returns a Map, you can retrieve the values using the following methods: Retrieve a value based on a key: use the `get(key)` method, where `key` is the key in the Map. For example, if the key of the Map is “username”, you can use `get(“username”)` to retrieve the corresponding value. Iterate through a […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/how-to-retrieve-values-from-a-map-returned-by-mybatis\/\" \/>\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=\"2024-03-16T07:46:22+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-22T10:03:53+00:00\" \/>\n<meta name=\"author\" content=\"Emily Johnson\" \/>\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=\"Emily Johnson\" \/>\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-to-retrieve-values-from-a-map-returned-by-mybatis\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-retrieve-values-from-a-map-returned-by-mybatis\/\"},\"author\":{\"name\":\"Emily Johnson\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/3b041b19cffc258705478ecfab895378\"},\"headline\":\"How to retrieve values from a map returned by MyBatis?\",\"datePublished\":\"2024-03-16T07:46:22+00:00\",\"dateModified\":\"2024-03-22T10:03:53+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-retrieve-values-from-a-map-returned-by-mybatis\/\"},\"wordCount\":188,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#organization\"},\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-retrieve-values-from-a-map-returned-by-mybatis\/\",\"url\":\"https:\/\/www.silicloud.com\/blog\/how-to-retrieve-values-from-a-map-returned-by-mybatis\/\",\"name\":\"How to retrieve values from a map returned by MyBatis? 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