{"provider_name":"Hatena Blog","blog_title":"\u306a\u304a\u3057\u3080\u8ad6","title":"\u578b\u3092optional\u306b\u5909\u3048\u3066\u30d0\u30b0\u3063\u305f","version":"1.0","type":"rich","author_name":"naosim","blog_url":"https://naosim.hatenablog.jp/","description":"\u30c6\u30b9\u30c8\u306e\u306a\u3044\u30b3\u30fc\u30c9\u306b\u5909\u66f4\u3092\u52a0\u3048\u305f\u3089\u52d5\u304b\u306a\u304f\u306a\u3063\u305f \u3042\u308b\u3042\u308b\u611f\u304c\u3042\u3063\u305f\u306e\u3067\u30e1\u30e2 java\u306f\u300c\u578b\u304c\u3042\u308b\u304b\u3089\u5b89\u5fc3\u300d\u3067\u306f\u306a\u3044 \u5143\u306e\u30b3\u30fc\u30c9\u306f\u3053\u3093\u306a\u611f\u3058 public class SampleEntity { LocalDate date; ... } Entity\u304cLocalDate\u3092\u6301\u3063\u3066\u308b \u3053\u308c\u3092\u4ed5\u69d8\u5909\u66f4\u3067Optional\u306b\u3057\u305f public class SampleEntity { Optional<LocalDate> date; ... } \u305d\u3046\u3059\u308b\u3068\u30d3\u30eb\u30c9\u30a8\u30e9\u30fc\u306b\u306a\u308b\u306e\u3067\u3001\u305d\u308c\u3092\u5168\u90e8\u6f70\u3057\u3066\u5b8c\u4e86\uff01 \u3063\u3068\u306a\u308b\u4e88\u5b9a\u304c\u52d5\u304b\u3057\u3066\u307f\u308b\u3068\u4e0a\u624b\u304f\u3044\u304b\u306a\u3044 \u3088\u304f\u3088\u304f\u8abf\u3079\u3066\u307f\u308b\u3068 \u3053\u306edate\u306b\u5bfe\u3057\u3066equal\u2026","image_url":null,"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fnaosim.hatenablog.jp%2Fentry%2F2018%2F02%2F10%2F085134\" title=\"\u578b\u3092optional\u306b\u5909\u3048\u3066\u30d0\u30b0\u3063\u305f - \u306a\u304a\u3057\u3080\u8ad6\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","height":"190","author_url":"https://blog.hatena.ne.jp/naosim/","width":"100%","published":"2018-02-10 08:51:34","categories":["java"],"url":"https://naosim.hatenablog.jp/entry/2018/02/10/085134","provider_url":"https://hatena.blog"}