{"id":22494,"date":"2024-11-21T15:15:20","date_gmt":"2024-11-21T07:15:20","guid":{"rendered":"https:\/\/fwq.ai\/blog\/22494\/"},"modified":"2024-11-21T15:15:20","modified_gmt":"2024-11-21T07:15:20","slug":"laravel%e6%80%8e%e4%b9%88%e5%88%a4%e6%96%ad%e6%9f%a5%e8%af%a2%e7%bb%93%e6%9e%9c","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/22494\/","title":{"rendered":"laravel\u600e\u4e48\u5224\u65ad\u67e5\u8be2\u7ed3\u679c"},"content":{"rendered":"

\u5728laravel\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u6211\u4eec\u901a\u5e38\u9700\u8981\u67e5\u8be2\u6570\u636e\u5e93\u4ee5\u83b7\u53d6\u6240\u9700\u6570\u636e\u3002\u5728\u8fd9\u4e9b\u67e5\u8be2\u671f\u95f4\uff0c\u6211\u4eec\u6709\u65f6\u9700\u8981\u5728\u4ee3\u7801\u4e2d\u7f16\u5199\u6761\u4ef6\u8bed\u53e5\u4ee5\u68c0\u67e5\u67e5\u8be2\u7ed3\u679c\u5e76\u6839\u636e\u7ed3\u679c\u91c7\u53d6\u76f8\u5e94\u7684\u63aa\u65bd\u3002\u56e0\u6b64\uff0c\u672c\u6587\u5c06\u4ecb\u7ecd\u5982\u4f55\u5728laravel\u4e2d\u5224\u65ad\u67e5\u8be2\u7ed3\u679c\u5e76\u7f16\u5199\u6761\u4ef6\u8bed\u53e5\u3002<\/p>\n

\u9996\u5148\uff0c\u6211\u4eec\u9700\u8981\u4e86\u89e3Laravel\u67e5\u8be2\u8fd4\u56de\u7684\u7ed3\u679c\u7c7b\u578b\u3002Laravel\u4e2d\u7684\u67e5\u8be2\u4f1a\u8fd4\u56de\u4e0d\u540c\u7684\u7ed3\u679c\u7c7b\u578b\uff0c\u53d6\u51b3\u4e8e\u60a8\u5728\u6267\u884c\u67e5\u8be2\u65f6\u4f7f\u7528\u54ea\u4e2a\u65b9\u6cd5\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u6700\u5e38\u7528\u7684\u67e5\u8be2\u65b9\u6cd5\u53ca\u5176\u8fd4\u56de\u503c\u7c7b\u578b\uff1a<\/p>\n

    \n
  1. get() – \u8fd4\u56de\u4e00\u4e2a\u67e5\u8be2\u7ed3\u679c\u96c6\u5408(Collection)<\/li>\n
  2. first() – \u8fd4\u56de\u5355\u4e2a\u6a21\u578b\u5b9e\u4f8b(Model)<\/li>\n
  3. find() – \u6839\u636e ID \u67e5\u627e\u5355\u4e2a\u6a21\u578b\u5b9e\u4f8b(Model)<\/li>\n
  4. pluck() – \u8fd4\u56de\u4e00\u4e2a\u5355\u72ec\u7684\u5217\u6570\u7ec4(Array)<\/li>\n
  5. count() – \u8fd4\u56de\u6574\u6570\u503c(Int)<\/li>\n
  6. exists() – \u8fd4\u56de\u5e03\u5c14\u503c(Boolean)<\/li>\n<\/ol>\n

    \u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u5b66\u4e60\u5982\u4f55\u5224\u65ad\u8fd9\u4e9b\u7ed3\u679c\u7c7b\u578b\u5e76\u7f16\u5199\u6761\u4ef6\u8bed\u53e5\u3002<\/p>\n

      \n
    1. Collection<\/li>\n<\/ol>\n

      Collection\u662fLaravel\u4e2d\u6700\u5e38\u7528\u7684\u7ed3\u679c\u7c7b\u578b\u4e4b\u4e00\u3002\u5f53\u6211\u4eec\u4f7f\u7528get()\u65b9\u6cd5\u8fdb\u884c\u67e5\u8be2\u65f6\uff0c\u5c06\u8fd4\u56de\u4e00\u4e2aCollection\u5b9e\u4f8b\u3002<\/p>\n

      \u8981\u5224\u65adCollection\u662f\u5426\u4e3a\u7a7a\uff0c\u8bf7\u4f7f\u7528isEmpty()\u65b9\u6cd5\u3002\u4f8b\u5982\uff1a<\/p>\n

      $users = DB::table('users')->get();\n\nif ($users->isEmpty()) {\n    \/\/ Collection\u4e3a\u7a7a\u7684\u60c5\u51b5\u4e0b\u6267\u884c\u7684\u4ee3\u7801\n} else {\n    \/\/ Collection\u4e0d\u4e3a\u7a7a\u7684\u60c5\u51b5\u4e0b\u6267\u884c\u7684\u4ee3\u7801\n}<\/pre>\n
        \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
      \u5982\u679c\u60a8\u53ea\u9700\u8981\u5728Collection\u4e2d\u4ec5\u6709\u4e00\u6761\u8bb0\u5f55\u65f6\u6267\u884c\u4ee3\u7801\uff0c\u8bf7\u4f7f\u7528isNotEmpty()\u65b9\u6cd5\u3002\u4f8b\u5982\uff1a<\/p>\n
      $users = DB::table('users')->get();\n\nif ($users->isNotEmpty()) {\n    \/\/ Collection\u4e2d\u6709\u8bb0\u5f55\u7684\u60c5\u51b5\u4e0b\u6267\u884c\u7684\u4ee3\u7801\n} else {\n     \/\/ Collection\u4e3a\u7a7a\u7684\u60c5\u51b5\u4e0b\u6267\u884c\u7684\u4ee3\u7801\n}<\/pre>\n
        \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
      \u5982\u679c\u60a8\u9700\u8981\u5728Collection\u4e2d\u67e5\u627e\u7279\u5b9a\u7684\u8bb0\u5f55\uff0c\u8bf7\u4f7f\u7528contains()\u65b9\u6cd5\u3002\u4f8b\u5982\uff1a<\/p>\n
      $users = DB::table('users')->get();\n\nif ($users->contains('name', 'John')) {\n    \/\/ Collection\u4e2d\u5305\u542b\u8bb0\u5f55\u7684\u60c5\u51b5\u4e0b\u6267\u884c\u7684\u4ee3\u7801\n} else {\n    \/\/ Collection\u4e2d\u4e0d\u5305\u542b\u8bb0\u5f55\u7684\u60c5\u51b5\u4e0b\u6267\u884c\u7684\u4ee3\u7801\n}<\/pre>\n
        \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
        \n
      1. Model<\/li>\n<\/ol>\n
        \u5f53\u6211\u4eec\u4f7f\u7528first()\u65b9\u6cd5\u8fdb\u884c\u67e5\u8be2\u65f6\uff0c\u5c06\u8fd4\u56de\u4e00\u4e2aModel\u5b9e\u4f8b\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528if\u8bed\u53e5\u5224\u65ad\u7ed3\u679c\u662f\u5426\u4e3a\u7a7a\u3002\u4f8b\u5982\uff1a<\/p>\n
        $user = DB::table('users')->where('email', 'john@example.com')->first();\n\nif ($user) {\n    \/\/ Model\u5b9e\u4f8b\u5b58\u5728\u7684\u60c5\u51b5\u4e0b\u6267\u884c\u7684\u4ee3\u7801\n} else {\n    \/\/ Model\u5b9e\u4f8b\u4e0d\u5b58\u5728\u7684\u60c5\u51b5\u4e0b\u6267\u884c\u7684\u4ee3\u7801\n}<\/pre>\n
          \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
        \u540c\u6837\uff0c\u5982\u679c\u60a8\u4f7f\u7528find()\u65b9\u6cd5\u67e5\u627e\u8bb0\u5f55\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528if\u8bed\u53e5\u5224\u65ad\u7ed3\u679c\u662f\u5426\u4e3a\u7a7a\u3002\u4f8b\u5982\uff1a<\/p>\n
        $user = DB::table('users')->find(1);\n\nif ($user) {\n    \/\/ Model\u5b9e\u4f8b\u5b58\u5728\u7684\u60c5\u51b5\u4e0b\u6267\u884c\u7684\u4ee3\u7801\n} else {\n    \/\/ Model\u5b9e\u4f8b\u4e0d\u5b58\u5728\u7684\u60c5\u51b5\u4e0b\u6267\u884c\u7684\u4ee3\u7801\n}<\/pre>\n
          \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
          \n
        1. Array<\/li>\n<\/ol>\n
          \u5f53\u4f7f\u7528pluck()\u65b9\u6cd5\u83b7\u53d6\u67e5\u8be2\u4e2d\u7684\u5355\u4e2a\u5217\u65f6\uff0c\u5c06\u8fd4\u56de\u4e00\u4e2a\u6570\u7ec4\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528empty()\u51fd\u6570\u6765\u68c0\u67e5\u6570\u7ec4\u662f\u5426\u4e3a\u7a7a\u3002\u4f8b\u5982\uff1a<\/p>\n
          $emails = DB::table('users')->pluck('email');\n\nif (empty($emails)) {\n    \/\/ \u6570\u7ec4\u4e3a\u7a7a\u7684\u60c5\u51b5\u4e0b\u6267\u884c\u7684\u4ee3\u7801\n} else {\n    \/\/ \u6570\u7ec4\u4e0d\u4e3a\u7a7a\u7684\u60c5\u51b5\u4e0b\u6267\u884c\u7684\u4ee3\u7801\n}<\/pre>\n
            \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
            \n
          1. Int<\/li>\n<\/ol>\n
            \u5f53\u4f7f\u7528count()\u65b9\u6cd5\u83b7\u53d6\u67e5\u8be2\u7ed3\u679c\u7684\u6570\u91cf\u65f6\uff0c\u5c06\u8fd4\u56de\u4e00\u4e2a\u6574\u6570\u503c\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528if\u8bed\u53e5\u68c0\u67e5\u7ed3\u679c\u662f\u5426\u4e3a0\u3002\u4f8b\u5982\uff1a<\/p>\n
            $count = DB::table('users')->count();\n\nif ($count == 0) {\n    \/\/ \u8bb0\u5f55\u6570\u4e3a0\u7684\u60c5\u51b5\u4e0b\u6267\u884c\u7684\u4ee3\u7801\n} else {\n    \/\/ \u8bb0\u5f55\u6570\u4e0d\u4e3a0\u7684\u60c5\u51b5\u4e0b\u6267\u884c\u7684\u4ee3\u7801\n}<\/pre>\n
              \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
              \n
            1. Boolean<\/li>\n<\/ol>\n
              \u5f53\u6211\u4eec\u4f7f\u7528exists()\u65b9\u6cd5\u68c0\u67e5\u662f\u5426\u5b58\u5728\u8bb0\u5f55\u65f6\uff0c\u5c06\u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c\u3002\u4f8b\u5982\uff1a<\/p>\n
              if (DB::table('users')->where('name', 'John')->exists()) {\n    \/\/ \u5b58\u5728\u8bb0\u5f55\u7684\u60c5\u51b5\u4e0b\u6267\u884c\u7684\u4ee3\u7801\n} else {\n    \/\/ \u4e0d\u5b58\u5728\u8bb0\u5f55\u7684\u60c5\u51b5\u4e0b\u6267\u884c\u7684\u4ee3\u7801\n}<\/pre>\n
                \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
              \u603b\u7ed3<\/p>\n
              \u5728Laravel\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u6211\u4eec\u901a\u5e38\u9700\u8981\u6839\u636e\u4e0d\u540c\u7684\u67e5\u8be2\u7ed3\u679c\u7f16\u5199\u6761\u4ef6\u8bed\u53e5\u3002\u672c\u6587\u4ecb\u7ecd\u4e86\u5982\u4f55\u5224\u65adCollection\u3001Model\u3001Array\u3001Int\u548cBoolean\u7c7b\u578b\u7684\u67e5\u8be2\u7ed3\u679c\uff0c\u5e76\u63d0\u4f9b\u4e86\u76f8\u5e94\u7684\u793a\u4f8b\u4ee3\u7801\u3002\u901a\u8fc7\u8fd9\u4e9b\u793a\u4f8b\uff0c\u6211\u4eec\u53ef\u4ee5\u66f4\u52a0\u7075\u6d3b\u5730\u4f7f\u7528Laravel\u67e5\u8be2\u65b9\u6cd5\u5e76\u5904\u7406\u5404\u79cd\u60c5\u51b5\u3002<\/p>\n
              \u4ee5\u4e0a\u5c31\u662flaravel\u600e\u4e48\u5224\u65ad\u67e5\u8be2\u7ed3\u679c\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
              \u5728laravel\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u6211\u4eec\u901a\u5e38\u9700\u8981\u67e5\u8be2\u6570\u636e\u5e93\u4ee5\u83b7\u53d6\u6240\u9700\u6570\u636e\u3002\u5728\u8fd9\u4e9b\u67e5\u8be2\u671f\u95f4\uff0c\u6211\u4eec\u6709\u65f6\u9700\u8981\u5728\u4ee3\u7801\u4e2d\u7f16\u5199\u6761\u4ef6\u8bed\u53e5\u4ee5\u68c0\u67e5\u67e5\u8be2\u7ed3\u679c\u5e76\u6839\u636e\u7ed3\u679c\u91c7\u53d6\u76f8\u5e94\u7684\u63aa\u65bd\u3002\u56e0\u6b64\uff0c\u672c\u6587\u5c06\u4ecb\u7ecd\u5982\u4f55\u5728laravel\u4e2d\u5224\u65ad\u67e5\u8be2\u7ed3\u679c\u5e76\u7f16\u5199\u6761\u4ef6\u8bed\u53e5\u3002 \u9996\u5148\uff0c\u6211\u4eec\u9700\u8981\u4e86\u89e3Laravel\u67e5\u8be2\u8fd4\u56de\u7684\u7ed3\u679c\u7c7b\u578b\u3002Laravel\u4e2d\u7684\u67e5\u8be2\u4f1a\u8fd4\u56de\u4e0d\u540c\u7684\u7ed3\u679c\u7c7b\u578b\uff0c\u53d6\u51b3\u4e8e\u60a8\u5728\u6267\u884c\u67e5\u8be2\u65f6\u4f7f\u7528\u54ea\u4e2a\u65b9\u6cd5\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u6700\u5e38\u7528\u7684\u67e5\u8be2\u65b9\u6cd5\u53ca\u5176\u8fd4\u56de\u503c\u7c7b\u578b\uff1a get() – \u8fd4\u56de\u4e00\u4e2a\u67e5\u8be2\u7ed3\u679c\u96c6\u5408(Collection) first() – \u8fd4\u56de\u5355\u4e2a\u6a21\u578b\u5b9e\u4f8b(Model) find() – \u6839\u636e ID \u67e5\u627e\u5355\u4e2a\u6a21\u578b\u5b9e\u4f8b(Model) pluck() – \u8fd4\u56de\u4e00\u4e2a\u5355\u72ec\u7684\u5217\u6570\u7ec4(Array) count() – \u8fd4\u56de\u6574\u6570\u503c(Int) exists() – \u8fd4\u56de\u5e03\u5c14\u503c(Boolean) \u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u5b66\u4e60\u5982\u4f55\u5224\u65ad\u8fd9\u4e9b\u7ed3\u679c\u7c7b\u578b\u5e76\u7f16\u5199\u6761\u4ef6\u8bed\u53e5\u3002 Collection Collection\u662fLaravel\u4e2d\u6700\u5e38\u7528\u7684\u7ed3\u679c\u7c7b\u578b\u4e4b\u4e00\u3002\u5f53\u6211\u4eec\u4f7f\u7528get()\u65b9\u6cd5\u8fdb\u884c\u67e5\u8be2\u65f6\uff0c\u5c06\u8fd4\u56de\u4e00\u4e2aCollection\u5b9e\u4f8b\u3002 \u8981\u5224\u65adCollection\u662f\u5426\u4e3a\u7a7a\uff0c\u8bf7\u4f7f\u7528isEmpty()\u65b9\u6cd5\u3002\u4f8b\u5982\uff1a $users = DB::table(‘users’)->get(); if ($users->isEmpty()) { \/\/ Collection\u4e3a\u7a7a\u7684\u60c5\u51b5\u4e0b\u6267\u884c\u7684\u4ee3\u7801 } else { \/\/ Collection\u4e0d\u4e3a\u7a7a\u7684\u60c5\u51b5\u4e0b\u6267\u884c\u7684\u4ee3\u7801 } \u767b\u5f55\u540e\u590d\u5236 \u5982\u679c\u60a8\u53ea\u9700\u8981\u5728Collection\u4e2d\u4ec5\u6709\u4e00\u6761\u8bb0\u5f55\u65f6\u6267\u884c\u4ee3\u7801\uff0c\u8bf7\u4f7f\u7528isNotEmpty()\u65b9\u6cd5\u3002\u4f8b\u5982\uff1a $users = DB::table(‘users’)->get(); if ($users->isNotEmpty()) { \/\/ Collection\u4e2d\u6709\u8bb0\u5f55\u7684\u60c5\u51b5\u4e0b\u6267\u884c\u7684\u4ee3\u7801 } else { \/\/ Collection\u4e3a\u7a7a\u7684\u60c5\u51b5\u4e0b\u6267\u884c\u7684\u4ee3\u7801 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-22494","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/22494","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=22494"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/22494\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=22494"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=22494"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=22494"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}