{"id":44832,"date":"2022-11-26T12:28:07","date_gmt":"2023-10-27T17:36:40","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/44832-2\/"},"modified":"2024-04-29T02:33:24","modified_gmt":"2024-04-28T18:33:24","slug":"44832-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/44832-2\/","title":{"rendered":""},"content":{"rendered":"<h1>\u306f\u3058\u3081\u306b<\/h1>\n<p>\u69cb\u9020\u4f53\u3092JSON\u306b\u5909\u63db\u3057\u305f\u3068\u304d\u306b\u3001\u4e0d\u8981\u306a\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u9664\u5916\u3057\u305f\u3044<br \/>\nvalue\u306bnull\u3092\u5165\u308c\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u305d\u3082\u305d\u3082key\u3082value\u3082\u9664\u5916\u3057\u305f\u3044<\/p>\n<p>\u305d\u306e\u3088\u3046\u306a\u6642\u306b\u4f7f\u3046omitempty\u30bf\u30b0\u306a\u308b\u3082\u306e\u304c\u3042\u308b\u304c\u3001\u3044\u304f\u3064\u304b\u30cf\u30de\u308a\u30dd\u30a4\u30f3\u30c8\u304c\u3042\u3063\u305f\u306e\u3067\u5099\u5fd8\u9332\u3068\u3057\u3066\u6b8b\u3059<\/p>\n<h1>\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/h1>\n<p>\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u69cb\u9020\u4f53\u304c\u3042\u308b<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">type<\/span> <span class=\"n\">Player<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"n\">Name<\/span>     <span class=\"kt\">string<\/span>  <span class=\"s\">`json:\"name\"`<\/span>\r\n  <span class=\"n\">Age<\/span>      <span class=\"kt\">int<\/span>     <span class=\"s\">`json:\"age,omitempty\"`<\/span>\r\n  <span class=\"n\">Weight<\/span>   <span class=\"kt\">int<\/span>     <span class=\"s\">`json:\"weight\"`<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u3053\u308c\u3092\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5f62\u3067JSON\u306b\u5909\u63db\u3059\u308b<\/p>\n<pre class=\"post-pre\"><code><span class=\"n\">player1<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">Player<\/span><span class=\"p\">{<\/span>\r\n  <span class=\"n\">Name<\/span><span class=\"o\">:<\/span> <span class=\"s\">\"Alice\"<\/span><span class=\"p\">,<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"n\">hogehoge<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">json<\/span><span class=\"o\">.<\/span><span class=\"n\">Marshal<\/span><span class=\"p\">(<\/span><span class=\"n\">player1<\/span><span class=\"p\">)<\/span>\r\n\r\n<span class=\"c\">\/\/ \u3053\u306e\u3088\u3046\u306b\u3057\u3066\u751f\u6210\u3055\u308c\u308bJSON\u306f\u4ee5\u4e0b\u306e\u901a\u308a<\/span>\r\n<span class=\"c\">\/\/ {<\/span>\r\n<span class=\"c\">\/\/   \"name\": \"Alice\",<\/span>\r\n<span class=\"c\">\/\/   \"weight\": 0<\/span>\r\n<span class=\"c\">\/\/ }<\/span>\r\n<\/code><\/pre>\n<p>omitempty\u30bf\u30b0\u3092\u3064\u3051\u3066\u3044\u306a\u3044weight\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u306f\u521d\u671f\u5024\uff08\uff1f\uff09\u306e0\u304c\u52dd\u624b\u306b\u5165\u3063\u3066\u3044\u308b<br \/>\n\u30bf\u30b0\u3092\u3064\u3051\u305fage\u30d5\u30a3\u30fc\u30eb\u30c9\u306f\u7121\u8996\u3055\u308c\u3066\u3044\u308b<\/p>\n<p>\u3057\u304b\u3057\u3001\u516c\u5f0fDoc\u306b\u3088\u308b\u3068\u3001\u3053\u306e\u3088\u3046\u306bomitempty\u30bf\u30b0\u3092\u3064\u3051\u308b\u3053\u3068\u3067\u7121\u8996\u3067\u304d\u308b\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u578b\u306f\u6c7a\u307e\u3063\u3066\u3044\u308b<\/p>\n<blockquote><p>The &#8220;omitempty&#8221; option specifies that the field should be omitted from the encoding if the field has an empty value, defined as false, 0, a nil pointer, a nil interface value, and any empty array, slice, map, or string.<\/p><\/blockquote>\n<p>\u2192bool\u578b\u306efalse\u3001int\u578b\u306a\u3069\u306e0\u3001nil\u30dd\u30a4\u30f3\u30bf\u3001nil\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3001\u7a7a\u306earray\u30fbslice\u30fbmap\u3001\u7a7a\u6587\u5b57\u3042\u305f\u308a\u304comitempty\u30bf\u30b0\u3092\u4f7f\u3048\u308b\u3089\u3057\u3044<\/p>\n<h1>\u69cb\u9020\u4f53\u3092\u7121\u8996\u3057\u305f\u3044<\/h1>\n<p>\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306aPlayer\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u3042\u308bItem\u69cb\u9020\u4f53\u3092\u7121\u8996\u3057\u305f\u3044\u5834\u5408\u306f\u3069\u3046\u3059\u308c\u3070\u826f\u3044\u304b\uff1f<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">type<\/span> <span class=\"n\">Player<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"n\">Name<\/span>     <span class=\"kt\">string<\/span>  <span class=\"s\">`json:\"name\"`<\/span>\r\n  <span class=\"n\">Age<\/span>      <span class=\"kt\">int<\/span>     <span class=\"s\">`json:\"age,omitempty\"`<\/span>\r\n  <span class=\"n\">Weight<\/span>   <span class=\"kt\">int<\/span>     <span class=\"s\">`json:\"weight\"`<\/span>\r\n  <span class=\"n\">Item<\/span>     <span class=\"n\">Item<\/span>    <span class=\"s\">`json:\"item,omitempty\"`<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">type<\/span> <span class=\"n\">Item<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"n\">Name<\/span>     <span class=\"kt\">string<\/span>  <span class=\"s\">`json:\"name\"`<\/span>\r\n  <span class=\"n\">Price<\/span>    <span class=\"kt\">int<\/span>     <span class=\"s\">`json:\"price\"`<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u307e\u305a\u3001\u7d20\u76f4\u306bItem\u306bomitempty\u30bf\u30b0\u3092\u3064\u3051\u3066\u307f\u308b\u3068\u3001<\/p>\n<pre class=\"post-pre\"><code><span class=\"n\">player1<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">Player<\/span><span class=\"p\">{<\/span>\r\n  <span class=\"n\">Name<\/span><span class=\"o\">:<\/span> <span class=\"s\">\"Alice\"<\/span><span class=\"p\">,<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"n\">hogehoge<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">json<\/span><span class=\"o\">.<\/span><span class=\"n\">Marshal<\/span><span class=\"p\">(<\/span><span class=\"n\">player1<\/span><span class=\"p\">)<\/span>\r\n\r\n<span class=\"c\">\/\/ \u3053\u306e\u3088\u3046\u306b\u3057\u3066\u751f\u6210\u3055\u308c\u308bJSON\u306f\u4ee5\u4e0b\u306e\u901a\u308a<\/span>\r\n<span class=\"c\">\/\/ {<\/span>\r\n<span class=\"c\">\/\/   \"name\": \"Alice\",<\/span>\r\n<span class=\"c\">\/\/   \"weight\": 0,<\/span>\r\n<span class=\"c\">\/\/   \"item\": null,<\/span>\r\n<span class=\"c\">\/\/ }<\/span>\r\n<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u3088\u3046\u306b\u3001item\u306f\u7121\u8996\u3055\u308c\u305a\u3001null\u304c\u5165\u3063\u3066\u3057\u307e\u3046<\/p>\n<p>\u3053\u308c\u3092\u56de\u907f\u3059\u308b\u306b\u306f\u3001\u30dd\u30a4\u30f3\u30bf\u3092\u4f7f\u3048\u3070\u826f\u3044<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">type<\/span> <span class=\"n\">Player<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"n\">Name<\/span>     <span class=\"kt\">string<\/span>  <span class=\"s\">`json:\"name\"`<\/span>\r\n  <span class=\"n\">Age<\/span>      <span class=\"kt\">int<\/span>     <span class=\"s\">`json:\"age,omitempty\"`<\/span>\r\n  <span class=\"n\">Weight<\/span>   <span class=\"kt\">int<\/span>     <span class=\"s\">`json:\"weight\"`<\/span>\r\n  <span class=\"n\">Item<\/span>     <span class=\"o\">*<\/span><span class=\"n\">Item<\/span>   <span class=\"s\">`json:\"item,omitempty\"`<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>omitempty\u30bf\u30b0\u3067nil\u30dd\u30a4\u30f3\u30bf\u306f\u7121\u8996\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u3067\u3001<\/p>\n<pre class=\"post-pre\"><code><span class=\"n\">player1<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">Player<\/span><span class=\"p\">{<\/span>\r\n  <span class=\"n\">Name<\/span><span class=\"o\">:<\/span> <span class=\"s\">\"Alice\"<\/span><span class=\"p\">,<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"n\">hogehoge<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">json<\/span><span class=\"o\">.<\/span><span class=\"n\">Marshal<\/span><span class=\"p\">(<\/span><span class=\"n\">player1<\/span><span class=\"p\">)<\/span>\r\n\r\n<span class=\"c\">\/\/ \u3053\u306e\u3088\u3046\u306b\u3057\u3066\u751f\u6210\u3055\u308c\u308bJSON\u306f\u4ee5\u4e0b\u306e\u901a\u308a<\/span>\r\n<span class=\"c\">\/\/ {<\/span>\r\n<span class=\"c\">\/\/   \"name\": \"Alice\",<\/span>\r\n<span class=\"c\">\/\/   \"weight\": 0<\/span>\r\n<span class=\"c\">\/\/ }<\/span>\r\n<\/code><\/pre>\n<h1>null\u306f\u7121\u8996\u3057\u305f\u3044\u3051\u30690\u306f\u8a31\u53ef\u3057\u305f\u3044<\/h1>\n<p>\u4f8b\u3048\u3070\u3001int\u578b\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u3067\u3001null\u306e\u5834\u5408\u306fJSON\u306b\u542b\u3081\u305f\u304f\u306a\u3044\u3051\u3069\u30010\u306e\u5834\u5408\u306f\u542b\u3081\u305f\u3044\u3053\u3068\u304c\u3042\u308b<\/p>\n<p>\u3053\u306e\u3088\u3046\u306a\u5834\u5408\u306b\u3082\u30dd\u30a4\u30f3\u30bf\u578b\u304c\u5f79\u7acb\u3064<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">type<\/span> <span class=\"n\">Player<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"n\">Name<\/span>     <span class=\"kt\">string<\/span>  <span class=\"s\">`json:\"name\"`<\/span>\r\n  <span class=\"n\">Age<\/span>      <span class=\"o\">*<\/span><span class=\"kt\">int<\/span>    <span class=\"s\">`json:\"age,omitempty\"`<\/span>\r\n  <span class=\"n\">Weight<\/span>   <span class=\"kt\">int<\/span>     <span class=\"s\">`json:\"weight,omitempty\"`<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"n\">zero<\/span> <span class=\"o\">:=<\/span> <span class=\"m\">0<\/span>\r\n\r\n<span class=\"n\">player1<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">Player<\/span><span class=\"p\">{<\/span>\r\n  <span class=\"n\">Name<\/span><span class=\"o\">:<\/span>   <span class=\"s\">\"Alice\"<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"n\">Age<\/span><span class=\"o\">:<\/span>    <span class=\"o\">&amp;<\/span><span class=\"n\">zero<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"n\">Weight<\/span><span class=\"o\">:<\/span> <span class=\"m\">0<\/span><span class=\"p\">,<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"n\">hogehoge<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">json<\/span><span class=\"o\">.<\/span><span class=\"n\">Marshal<\/span><span class=\"p\">(<\/span><span class=\"n\">player1<\/span><span class=\"p\">)<\/span>\r\n\r\n<span class=\"c\">\/\/ \u3053\u306e\u3088\u3046\u306b\u3057\u3066\u751f\u6210\u3055\u308c\u308bJSON\u306f\u4ee5\u4e0b\u306e\u901a\u308a<\/span>\r\n<span class=\"c\">\/\/ {<\/span>\r\n<span class=\"c\">\/\/   \"name\": \"Alice\",<\/span>\r\n<span class=\"c\">\/\/   \"age\": 0<\/span>\r\n<span class=\"c\">\/\/ }<\/span>\r\n<\/code><\/pre>\n<h1>omitempty\u30bf\u30b0\u306e\u3064\u3051\u304b\u305f\u306b\u6ce8\u610f\uff01\uff01<\/h1>\n<p>\u3053\u308c\u306f\u3001\u3082\u3057\u304b\u3057\u305f\u3089\u8d85\u57fa\u672c\u7684\u306a\u3053\u3068\u306a\u306e\u304b\u3082\u3057\u308c\u306a\u3044\u304c\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a18\u8ff0\u3059\u308b\u3068omitempty\u304c\u4e0a\u624b\u304f\u50cd\u304b\u306a\u3044<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">type<\/span> <span class=\"n\">Player<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"n\">Name<\/span>     <span class=\"kt\">string<\/span>  <span class=\"s\">`json:\"name\"`<\/span>\r\n  <span class=\"n\">Age<\/span>      <span class=\"kt\">int<\/span>     <span class=\"s\">`json:\"age, omitempty\"`<\/span>\r\n  <span class=\"n\">Weight<\/span>   <span class=\"kt\">int<\/span>     <span class=\"s\">`json:\"weight\"`<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>`json:&#8221;age, omitempty&#8221;`<br \/>\n\u3053\u306e\u90e8\u5206\u306e,\u3068omitempty\u306e\u9593\u306b\u534a\u89d2\u30b9\u30da\u30fc\u30b9\u304c\u3042\u308b\u3053\u3068\u304c\u60aa\u3055\u3092\u3057\u3066\u3044\u308b\u3089\u3057\u3044<br \/>\n\u306a\u306e\u3067\u3001\u6b63\u3057\u304f\u306f\u4ee5\u4e0b\u306e\u901a\u308a<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">type<\/span> <span class=\"n\">Player<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"n\">Name<\/span>     <span class=\"kt\">string<\/span>  <span class=\"s\">`json:\"name\"`<\/span>\r\n  <span class=\"n\">Age<\/span>      <span class=\"kt\">int<\/span>     <span class=\"s\">`json:\"age,omitempty\"`<\/span>\r\n  <span class=\"n\">Weight<\/span>   <span class=\"kt\">int<\/span>     <span class=\"s\">`json:\"weight\"`<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h1>\u3055\u3044\u3054\u306b<\/h1>\n<p>omitempty\u306b\u9650\u3089\u305a\u3001\u3057\u3063\u304b\u308a\u3068\u516c\u5f0fDoc\u8aad\u3080\u306e\u5927\u4e8b\uff01<br \/>\n\u30dd\u30a4\u30f3\u30bf\u304c\u4fbf\u5229<\/p>\n<h1>\u53c2\u8003<\/h1>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">json &#8211; The Go Programming Language<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Struct\u3092omitempty\u3059\u308b\u65b9\u6cd5 &#8211; Qiita<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">Go&#8217;s &#8220;omitempty&#8221; explained<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u306f\u3058\u3081\u306b \u69cb\u9020\u4f53\u3092JSON\u306b\u5909\u63db\u3057\u305f\u3068\u304d\u306b\u3001\u4e0d\u8981\u306a\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u9664\u5916\u3057\u305f\u3044 value\u306bnull\u3092\u5165\u308c\u308b\u306e\u3067\u306f\u306a [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-44832","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>- 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\/zh\/blog\/44832-2\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:description\" content=\"\u306f\u3058\u3081\u306b 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