{"id":22791,"date":"2024-11-21T14:19:13","date_gmt":"2024-11-21T06:19:13","guid":{"rendered":"https:\/\/fwq.ai\/blog\/22791\/"},"modified":"2024-11-21T14:19:13","modified_gmt":"2024-11-21T06:19:13","slug":"laravel%e6%9f%a5%e8%af%a2%e7%89%b9%e5%ae%9a%e5%ad%97%e6%ae%b5","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/22791\/","title":{"rendered":"laravel\u67e5\u8be2\u7279\u5b9a\u5b57\u6bb5"},"content":{"rendered":"

\u5728\u8fdb\u884claravel\u6570\u636e\u5e93\u67e5\u8be2\u65f6\uff0c\u6211\u4eec\u901a\u5e38\u9700\u8981\u6307\u5b9a\u8981\u68c0\u7d22\u7684\u7279\u5b9a\u5b57\u6bb5\u3002laravel\u63d0\u4f9b\u4e86\u51e0\u79cd\u4e0d\u540c\u7684\u65b9\u6cd5\u6765\u5b9e\u73b0\u8fd9\u4e2a\u76ee\u6807\u3002\u4ee5\u4e0b\u662f\u8fd9\u4e9b\u65b9\u6cd5\u7684\u8be6\u7ec6\u4ecb\u7ecd\uff1a<\/p>\n

    \n
  1. \u4f7f\u7528select()\u65b9\u6cd5<\/li>\n<\/ol>\n

    Laravel\u7684select()\u65b9\u6cd5\u662f\u6700\u57fa\u672c\u7684\u68c0\u7d22\u7279\u5b9a\u5b57\u6bb5\u7684\u65b9\u6cd5\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u8be5\u65b9\u6cd5\u6307\u5b9a\u8981\u8fd4\u56de\u7684\u5b57\u6bb5\u3002\u4f8b\u5982\uff0c\u4e0b\u9762\u662f\u4e00\u4e2a\u67e5\u8be2users\u8868\u4e2dname\u548cemail\u5b57\u6bb5\u7684\u793a\u4f8b\uff1a<\/p>\n

    $users = DB::table('users')\n             -&gt;select('name', 'email')\n             -&gt;get();<\/pre>\n
      \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
    \u4ece\u4e0a\u9762\u7684\u8bed\u53e5\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u6211\u4eec\u53ea\u9700\u8981\u5728select()\u65b9\u6cd5\u4e2d\u4f20\u9012\u8981\u68c0\u7d22\u7684\u5b57\u6bb5\u5373\u53ef\u3002\u8fd9\u4f1a\u8fd4\u56de\u4e00\u4e2a\u5305\u542bname\u548cemail\u5b57\u6bb5\u503c\u7684\u6570\u7ec4\u3002<\/p>\n
      \n
    1. \u4f7f\u7528addSelect()\u65b9\u6cd5<\/li>\n<\/ol>\n
      \u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u5728\u73b0\u6709\u7684\u67e5\u8be2\u64cd\u4f5c\u4e2d\u6dfb\u52a0\u8981\u8fd4\u56de\u7684\u5b57\u6bb5\u3002\u8fd9\u65f6\u53ef\u4ee5\u4f7f\u7528addSelect()\u65b9\u6cd5\u3002\u4f8b\u5982\uff0c\u4e0b\u9762\u662f\u4e00\u4e2a\u67e5\u8be2users\u8868\u4e2d\u6240\u6709\u5b57\u6bb5\uff0c\u5e76\u6dfb\u52a0\u4e00\u4e2acountry\u5b57\u6bb5\u7684\u793a\u4f8b\uff1a<\/p>\n
      $users = DB::table('users')\n             -&gt;addSelect('country')\n             -&gt;get();<\/pre>\n
        \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
      \u4ece\u4e0a\u9762\u7684\u8bed\u53e5\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u6211\u4eec\u53ea\u9700\u8981\u5728addSelect()\u65b9\u6cd5\u4e2d\u4f20\u9012\u8981\u6dfb\u52a0\u7684\u5b57\u6bb5\u5373\u53ef\u3002\u8fd9\u4f1a\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u6240\u6709\u5b57\u6bb5\u503c\u548ccountry\u5b57\u6bb5\u503c\u7684\u6570\u7ec4\u3002<\/p>\n
        \n
      1. \u4f7f\u7528pluck()\u65b9\u6cd5<\/li>\n<\/ol>\n
        \u5982\u679c\u6211\u4eec\u53ea\u9700\u8981\u68c0\u7d22\u4e00\u4e2a\u7279\u5b9a\u5b57\u6bb5\u7684\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528pluck()\u65b9\u6cd5\u3002\u4f8b\u5982\uff0c\u4e0b\u9762\u662f\u4e00\u4e2a\u67e5\u8be2users\u8868\u4e2demail\u5b57\u6bb5\u503c\u7684\u793a\u4f8b\uff1a<\/p>\n
        $email = DB::table('users')-&gt;where('name', 'John')-&gt;pluck('email');<\/pre>\n
          \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
        \u4ece\u4e0a\u9762\u7684\u8bed\u53e5\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u6211\u4eec\u53ea\u9700\u8981\u5728pluck()\u65b9\u6cd5\u4e2d\u4f20\u9012\u8981\u68c0\u7d22\u7684\u5b57\u6bb5\u5373\u53ef\u3002\u8fd9\u4f1a\u8fd4\u56de\u8be5\u5b57\u6bb5\u7684\u503c\u3002<\/p>\n
          \n
        1. \u4f7f\u7528value()\u65b9\u6cd5<\/li>\n<\/ol>\n
          \u4e0epluck()\u65b9\u6cd5\u7c7b\u4f3c\uff0cvalue()\u65b9\u6cd5\u4e5f\u662f\u53ea\u68c0\u7d22\u4e00\u4e2a\u7279\u5b9a\u5b57\u6bb5\u7684\u503c\u3002\u4f46\u662f\uff0c\u4e0epluck()\u65b9\u6cd5\u4e0d\u540c\u7684\u662f\uff0c\u5b83\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u5355\u72ec\u7684\u503c\uff0c\u800c\u4e0d\u662f\u4e00\u4e2a\u6570\u7ec4\u3002\u4f8b\u5982\uff0c\u4e0b\u9762\u662f\u4e00\u4e2a\u67e5\u8be2users\u8868\u4e2demail\u5b57\u6bb5\u503c\u7684\u793a\u4f8b\uff1a<\/p>\n
          $email = DB::table('users')-&gt;where('name', 'John')-&gt;value('email');<\/pre>\n
            \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
          \u4ece\u4e0a\u9762\u7684\u8bed\u53e5\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u6211\u4eec\u53ea\u9700\u8981\u5728value()\u65b9\u6cd5\u4e2d\u4f20\u9012\u8981\u68c0\u7d22\u7684\u5b57\u6bb5\u5373\u53ef\u3002\u8fd9\u4f1a\u8fd4\u56de\u8be5\u5b57\u6bb5\u7684\u503c\u3002<\/p>\n
            \n
          1. \u4f7f\u7528selectRaw()\u548cwhereIn()\u65b9\u6cd5<\/li>\n<\/ol>\n
            \u8fd8\u6709\u4e00\u79cd\u66f4\u9ad8\u7ea7\u7684\u65b9\u6cd5\u53ef\u4ee5\u68c0\u7d22\u7279\u5b9a\u5b57\u6bb5\u3002\u5982\u679c\u6211\u4eec\u9700\u8981\u4ece\u591a\u4e2a\u8868\u4e2d\u68c0\u7d22\u6570\u636e\uff0c\u5e76\u6839\u636e\u67d0\u4e9b\u6761\u4ef6\u8fc7\u6ee4\u6570\u636e\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528selectRaw()\u65b9\u6cd5\u3002\u4f8b\u5982\uff0c\u4e0b\u9762\u662f\u4e00\u4e2a\u67e5\u8be2orders\u8868\u548cproducts\u8868\u4e2d\u7279\u5b9a\u5b57\u6bb5\u7684\u793a\u4f8b\uff1a<\/p>\n
            $orders = DB::table('orders')\n                -&gt;selectRaw('price * ? as total_price', [2])\n                -&gt;whereIn('id', [1, 2, 3])\n                -&gt;get();<\/pre>\n
              \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
            \u4ece\u4e0a\u9762\u7684\u8bed\u53e5\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u6211\u4eec\u5728selectRaw()\u65b9\u6cd5\u4e2d\u7f16\u5199\u4e86\u4e00\u4e2a\u539f\u59cbSQL\u67e5\u8be2\u6765\u8ba1\u7b97\u603b\u4ef7\u683c\u3002\u6211\u4eec\u8fd8\u4f7f\u7528whereIn()\u65b9\u6cd5\u6307\u5b9a\u8981\u68c0\u7d22\u7684orders id\uff0c\u5e76\u4f7f\u7528get()\u65b9\u6cd5\u83b7\u53d6\u67e5\u8be2\u7ed3\u679c\u3002<\/p>\n
            \u603b\u7ed3<\/p>\n
            \u5728Laravel\u4e2d\u8fdb\u884c\u6570\u636e\u5e93\u67e5\u8be2\u65f6\uff0c\u6307\u5b9a\u8981\u68c0\u7d22\u7684\u7279\u5b9a\u5b57\u6bb5\u662f\u4e00\u4e2a\u5f88\u5e38\u89c1\u7684\u9700\u6c42\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528select()\u3001addSelect()\u3001pluck()\u3001value()\u548cselectRaw()\u7b49\u65b9\u6cd5\u6765\u5b9e\u73b0\u8fd9\u4e2a\u76ee\u6807\u3002\u8fd9\u4e9b\u65b9\u6cd5\u63d0\u4f9b\u4e86\u4e0d\u540c\u7684\u7075\u6d3b\u6027\u548c\u529f\u80fd\uff0c\u8ba9\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u7684\u67e5\u8be2\u9700\u6c42\u9009\u62e9\u9002\u5408\u7684\u65b9\u6cd5\u3002<\/p>\n
            \u4ee5\u4e0a\u5c31\u662flaravel\u67e5\u8be2\u7279\u5b9a\u5b57\u6bb5\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":"
            \u5728\u8fdb\u884claravel\u6570\u636e\u5e93\u67e5\u8be2\u65f6\uff0c\u6211\u4eec\u901a\u5e38\u9700\u8981\u6307\u5b9a\u8981\u68c0\u7d22\u7684\u7279\u5b9a\u5b57\u6bb5\u3002laravel\u63d0\u4f9b\u4e86\u51e0\u79cd\u4e0d\u540c\u7684\u65b9\u6cd5\u6765\u5b9e\u73b0\u8fd9\u4e2a\u76ee\u6807\u3002\u4ee5\u4e0b\u662f\u8fd9\u4e9b\u65b9\u6cd5\u7684\u8be6\u7ec6\u4ecb\u7ecd\uff1a \u4f7f\u7528select()\u65b9\u6cd5 Laravel\u7684select()\u65b9\u6cd5\u662f\u6700\u57fa\u672c\u7684\u68c0\u7d22\u7279\u5b9a\u5b57\u6bb5\u7684\u65b9\u6cd5\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u8be5\u65b9\u6cd5\u6307\u5b9a\u8981\u8fd4\u56de\u7684\u5b57\u6bb5\u3002\u4f8b\u5982\uff0c\u4e0b\u9762\u662f\u4e00\u4e2a\u67e5\u8be2users\u8868\u4e2dname\u548cemail\u5b57\u6bb5\u7684\u793a\u4f8b\uff1a $users = DB::table(‘users’) -&gt;select(‘name’, ’email’) -&gt;get(); \u767b\u5f55\u540e\u590d\u5236 \u4ece\u4e0a\u9762\u7684\u8bed\u53e5\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u6211\u4eec\u53ea\u9700\u8981\u5728select()\u65b9\u6cd5\u4e2d\u4f20\u9012\u8981\u68c0\u7d22\u7684\u5b57\u6bb5\u5373\u53ef\u3002\u8fd9\u4f1a\u8fd4\u56de\u4e00\u4e2a\u5305\u542bname\u548cemail\u5b57\u6bb5\u503c\u7684\u6570\u7ec4\u3002 \u4f7f\u7528addSelect()\u65b9\u6cd5 \u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u5728\u73b0\u6709\u7684\u67e5\u8be2\u64cd\u4f5c\u4e2d\u6dfb\u52a0\u8981\u8fd4\u56de\u7684\u5b57\u6bb5\u3002\u8fd9\u65f6\u53ef\u4ee5\u4f7f\u7528addSelect()\u65b9\u6cd5\u3002\u4f8b\u5982\uff0c\u4e0b\u9762\u662f\u4e00\u4e2a\u67e5\u8be2users\u8868\u4e2d\u6240\u6709\u5b57\u6bb5\uff0c\u5e76\u6dfb\u52a0\u4e00\u4e2acountry\u5b57\u6bb5\u7684\u793a\u4f8b\uff1a $users = DB::table(‘users’) -&gt;addSelect(‘country’) -&gt;get(); \u767b\u5f55\u540e\u590d\u5236 \u4ece\u4e0a\u9762\u7684\u8bed\u53e5\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u6211\u4eec\u53ea\u9700\u8981\u5728addSelect()\u65b9\u6cd5\u4e2d\u4f20\u9012\u8981\u6dfb\u52a0\u7684\u5b57\u6bb5\u5373\u53ef\u3002\u8fd9\u4f1a\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u6240\u6709\u5b57\u6bb5\u503c\u548ccountry\u5b57\u6bb5\u503c\u7684\u6570\u7ec4\u3002 \u4f7f\u7528pluck()\u65b9\u6cd5 \u5982\u679c\u6211\u4eec\u53ea\u9700\u8981\u68c0\u7d22\u4e00\u4e2a\u7279\u5b9a\u5b57\u6bb5\u7684\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528pluck()\u65b9\u6cd5\u3002\u4f8b\u5982\uff0c\u4e0b\u9762\u662f\u4e00\u4e2a\u67e5\u8be2users\u8868\u4e2demail\u5b57\u6bb5\u503c\u7684\u793a\u4f8b\uff1a $email = DB::table(‘users’)-&gt;where(‘name’, ‘John’)-&gt;pluck(’email’); \u767b\u5f55\u540e\u590d\u5236 \u4ece\u4e0a\u9762\u7684\u8bed\u53e5\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u6211\u4eec\u53ea\u9700\u8981\u5728pluck()\u65b9\u6cd5\u4e2d\u4f20\u9012\u8981\u68c0\u7d22\u7684\u5b57\u6bb5\u5373\u53ef\u3002\u8fd9\u4f1a\u8fd4\u56de\u8be5\u5b57\u6bb5\u7684\u503c\u3002 \u4f7f\u7528value()\u65b9\u6cd5 \u4e0epluck()\u65b9\u6cd5\u7c7b\u4f3c\uff0cvalue()\u65b9\u6cd5\u4e5f\u662f\u53ea\u68c0\u7d22\u4e00\u4e2a\u7279\u5b9a\u5b57\u6bb5\u7684\u503c\u3002\u4f46\u662f\uff0c\u4e0epluck()\u65b9\u6cd5\u4e0d\u540c\u7684\u662f\uff0c\u5b83\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u5355\u72ec\u7684\u503c\uff0c\u800c\u4e0d\u662f\u4e00\u4e2a\u6570\u7ec4\u3002\u4f8b\u5982\uff0c\u4e0b\u9762\u662f\u4e00\u4e2a\u67e5\u8be2users\u8868\u4e2demail\u5b57\u6bb5\u503c\u7684\u793a\u4f8b\uff1a $email = DB::table(‘users’)-&gt;where(‘name’, ‘John’)-&gt;value(’email’); \u767b\u5f55\u540e\u590d\u5236 \u4ece\u4e0a\u9762\u7684\u8bed\u53e5\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u6211\u4eec\u53ea\u9700\u8981\u5728value()\u65b9\u6cd5\u4e2d\u4f20\u9012\u8981\u68c0\u7d22\u7684\u5b57\u6bb5\u5373\u53ef\u3002\u8fd9\u4f1a\u8fd4\u56de\u8be5\u5b57\u6bb5\u7684\u503c\u3002 \u4f7f\u7528selectRaw()\u548cwhereIn()\u65b9\u6cd5 \u8fd8\u6709\u4e00\u79cd\u66f4\u9ad8\u7ea7\u7684\u65b9\u6cd5\u53ef\u4ee5\u68c0\u7d22\u7279\u5b9a\u5b57\u6bb5\u3002\u5982\u679c\u6211\u4eec\u9700\u8981\u4ece\u591a\u4e2a\u8868\u4e2d\u68c0\u7d22\u6570\u636e\uff0c\u5e76\u6839\u636e\u67d0\u4e9b\u6761\u4ef6\u8fc7\u6ee4\u6570\u636e\uff0c\u5219\u53ef\u4ee5\u4f7f\u7528selectRaw()\u65b9\u6cd5\u3002\u4f8b\u5982\uff0c\u4e0b\u9762\u662f\u4e00\u4e2a\u67e5\u8be2orders\u8868\u548cproducts\u8868\u4e2d\u7279\u5b9a\u5b57\u6bb5\u7684\u793a\u4f8b\uff1a $orders = DB::table(‘orders’) -&gt;selectRaw(‘price * ? as total_price’, [2]) -&gt;whereIn(‘id’, [1, 2, 3]) -&gt;get(); \u767b\u5f55\u540e\u590d\u5236 \u4ece\u4e0a\u9762\u7684\u8bed\u53e5\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\uff0c\u6211\u4eec\u5728selectRaw()\u65b9\u6cd5\u4e2d\u7f16\u5199\u4e86\u4e00\u4e2a\u539f\u59cbSQL\u67e5\u8be2\u6765\u8ba1\u7b97\u603b\u4ef7\u683c\u3002\u6211\u4eec\u8fd8\u4f7f\u7528whereIn()\u65b9\u6cd5\u6307\u5b9a\u8981\u68c0\u7d22\u7684orders id\uff0c\u5e76\u4f7f\u7528get()\u65b9\u6cd5\u83b7\u53d6\u67e5\u8be2\u7ed3\u679c\u3002 […]<\/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-22791","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/22791","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=22791"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/22791\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=22791"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=22791"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=22791"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}