{"id":23014,"date":"2024-11-21T15:46:42","date_gmt":"2024-11-21T07:46:42","guid":{"rendered":"https:\/\/fwq.ai\/blog\/23014\/"},"modified":"2024-11-21T15:46:42","modified_gmt":"2024-11-21T07:46:42","slug":"laravel-%e5%85%b3%e8%81%94-%e6%9f%a5%e8%af%a2%e6%ac%a1%e6%95%b0","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/23014\/","title":{"rendered":"laravel \u5173\u8054 \u67e5\u8be2\u6b21\u6570"},"content":{"rendered":"

laravel\u662f\u4e00\u4e2a\u975e\u5e38\u6d41\u884c\u7684php\u6846\u67b6\uff0c\u62e5\u6709\u4e30\u5bcc\u7684\u7279\u6027\u548c\u6613\u7528\u7684api\u3002\u5176\u4e2d\uff0celoquent orm\u662f\u5b83\u6700\u5f3a\u5927\u7684\u6570\u636e\u5e93\u7ec4\u4ef6\u4e4b\u4e00\uff0c\u7528\u5b83\u53ef\u4ee5\u8f7b\u677e\u5730\u8fdb\u884c\u67e5\u8be2\u548c\u5173\u8054\u3002<\/p>\n

\u7136\u800c\uff0c\u5f53\u6211\u4eec\u8fdb\u884c\u590d\u6742\u7684\u5173\u8054\u67e5\u8be2\u65f6\uff0c\u4f1a\u53d1\u73b0\u67e5\u8be2\u7684\u6b21\u6570\u53d8\u5f97\u5f88\u591a\uff0c\u7279\u522b\u662f\u5728\u4f7f\u7528\u5faa\u73af\u65f6\u3002\u8fd9\u4e0d\u4ec5\u4f1a\u5f71\u54cd\u67e5\u8be2\u6027\u80fd\uff0c\u8fd8\u53ef\u80fd\u5bfc\u81f4\u6570\u636e\u5e93\u8fde\u63a5\u5f02\u5e38\u3002<\/p>\n

\u90a3\u4e48\uff0c\u6211\u4eec\u8be5\u5982\u4f55\u51cf\u5c11Laravel\u5173\u8054\u67e5\u8be2\u7684\u6b21\u6570\u5462\uff1f\u4e0b\u9762\uff0c\u672c\u6587\u5c06\u63d0\u4f9b\u4e00\u4e9b\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n

    \n
  1. \u5ef6\u8fdf\u52a0\u8f7d<\/li>\n<\/ol>\n

    \u5728\u8fdb\u884c\u5173\u8054\u67e5\u8be2\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528Laravel\u7684\u5ef6\u8fdf\u52a0\u8f7d\u529f\u80fd\uff0c\u5b83\u4f1a\u5728\u9700\u8981\u4f7f\u7528\u5173\u8054\u6a21\u578b\u65f6\u624d\u8fdb\u884c\u67e5\u8be2\u3002<\/p>\n

    \u5ef6\u8fdf\u52a0\u8f7d\u4f7f\u7528\u7684\u662f\u9b54\u672f\u65b9\u6cd5__get()\uff0c\u6240\u4ee5\u53ea\u8981\u5728\u5173\u8054\u6a21\u578b\u4e0a\u8c03\u7528\u65f6\uff0c\u5c31\u4f1a\u89e6\u53d1\u5173\u8054\u67e5\u8be2\u3002<\/p>\n

    \u4f8b\u5982\uff1a<\/p>\n

    $users = User::all();<\/p>\n

    foreach ($users as $user) {<\/p>\n

    echo $user-&gt;profile-&gt;name;<\/pre>\n
      \u767b\u5f55\u540e\u590d\u5236    \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
    }<\/p>\n
    \u5982\u679c\u6211\u4eec\u76f4\u63a5\u5728foreach\u5faa\u73af\u5185\u4f7f\u7528$users->profile\uff0c\u90a3\u4e48\u5728\u6bcf\u6b21\u5faa\u73af\u5185\uff0c\u90fd\u4f1a\u6267\u884c\u4e00\u6b21\u5173\u8054\u67e5\u8be2\uff0c\u8fd9\u6837\u4f1a\u5bfc\u81f4\u67e5\u8be2\u6b21\u6570\u5f88\u591a\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5ef6\u8fdf\u52a0\u8f7d\u6765\u4f18\u5316\u5b83\u3002<\/p>\n
    $users = User::with(‘profile’)->get();<\/p>\n
    foreach ($users as $user) {<\/p>\n
    echo $user-&gt;profile-&gt;name;<\/pre>\n
      \u767b\u5f55\u540e\u590d\u5236    \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
    }<\/p>\n
    \u4f7f\u7528with()\u65b9\u6cd5\u9884\u52a0\u8f7d\u5173\u8054\u6a21\u578b\u65f6\uff0c\u5ef6\u8fdf\u52a0\u8f7d\u4f1a\u81ea\u52a8\u542f\u7528\uff0c\u53ea\u6709\u5728\u9700\u8981\u4f7f\u7528\u5173\u8054\u6a21\u578b\u65f6\u624d\u8fdb\u884c\u67e5\u8be2\u3002<\/p>\n
      \n
    1. Eager Loading<\/li>\n<\/ol>\n
      \u5ef6\u8fdf\u52a0\u8f7d\u53ea\u8981\u6211\u4eec\u624b\u52a8\u53bb\u8c03\u7528\uff0c\u5982\u679c\u6211\u4eec\u6ca1\u6709\u5bf9\u4ee3\u7801\u505a\u5168\u9762\u7684\u68c0\u67e5\uff0c\u4ecd\u7136\u4f1a\u51fa\u73b0\u91cd\u590d\u67e5\u8be2\u7684\u60c5\u51b5\uff0c\u6240\u4ee5\u66f4\u5f7b\u5e95\u7684\u89e3\u51b3\u65b9\u6cd5\u662f\u4f7f\u7528Eager Loading\uff08\u9884\u52a0\u8f7d\uff09\uff0c\u5b83\u53ef\u4ee5\u4e00\u6b21\u6027\u52a0\u8f7d\u6240\u6709\u9700\u8981\u7684\u5173\u8054\u6a21\u578b\u3002<\/p>\n
      \u4f8b\u5982\uff1a<\/p>\n
      $users = User::with(‘profile’, ‘posts’)->get();<\/p>\n
      foreach ($users as $user) {<\/p>\n
      echo $user-&gt;profile-&gt;name;\n\nforeach ($user->posts as $post) {\n    echo $post->title;\n}<\/pre>\n
        \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
      }<\/p>\n
      \u4f7f\u7528with()\u65b9\u6cd5\u540c\u65f6\u52a0\u8f7d\u591a\u4e2a\u5173\u8054\u6a21\u578b\u65f6\uff0c\u4f1a\u6267\u884c\u591a\u4e2aSQL\u67e5\u8be2\uff0c\u5982\u679c\u6211\u4eec\u53ea\u9700\u4f7f\u7528\u5176\u4e2d\u4e00\u4e2a\u5173\u8054\u6a21\u578b\uff0c\u90a3\u4e48\u8fd9\u79cd\u65b9\u6cd5\u5c31\u4e0d\u662f\u6700\u597d\u7684\u9009\u62e9\u3002<\/p>\n
        \n
      1. select \u58f0\u660e\u5173\u8054\u5b57\u6bb5<\/li>\n<\/ol>\n
        \u5728Eloquent\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528select\u65b9\u6cd5\u5bf9\u67d0\u4e2a\u6a21\u578b\u8fdb\u884c\u4e00\u4e9b\u7b5b\u9009\uff0c\u6307\u5b9a\u6211\u4eec\u9700\u8981\u7684\u7279\u5b9a\u5217\uff0c\u800c\u5173\u8054\u6a21\u578b\u4e5f\u662f\u4e00\u6837\u3002<\/p>\n
        \u4f8b\u5982\uff1a<\/p>\n
        $users = User::with([‘profile’ => function ($query) {<\/p>\n
        $query-&gt;select('user_id', 'name');<\/pre>\n
          \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
        }])->get();<\/p>\n
        foreach ($users as $user) {<\/p>\n
        echo $user-&gt;profile-&gt;name; \/\/ \u53ea\u4f1a\u67e5\u8be2'profile'\u8868\u4e2d\u7684'user_id'\u548c'name'\u5217<\/pre>\n
          \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
        }<\/p>\n
        \u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u901a\u8fc7\u6307\u5b9aselect()\u65b9\u6cd5\u8f93\u51fa\u81ea\u5df1\u9700\u8981\u7684\u5217\uff0c\u53ef\u4ee5\u8ba9Eloquent ORM \u4e00\u6b21\u53ea\u67e5\u8be2\u4e00\u4e9b\u7279\u5b9a\u7684\u6570\u636e\u5217\uff0c\u8fd9\u662f\u4e00\u4e2a\u5feb\u901f\u67e5\u8be2\u7279\u5b9a\u6570\u636e\u7684\u597d\u65b9\u6cd5\uff0c\u4e5f\u4e3a\u6211\u4eec\u51cf\u5c11\u4e86\u989d\u5916\u7684\u67e5\u8be2\u6b21\u6570\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u8fd9\u79cd\u65b9\u6cd5\u6765\u9650\u5236\u5173\u8054\u6a21\u578b\u7684\u67e5\u8be2\u3002<\/p>\n
          \n
        1. \u4f7f\u7528 join \u8fdb\u884c\u5173\u8054\u67e5\u8be2<\/li>\n<\/ol>\n
          \u9664\u4e86\u4e0e\u5173\u8054\u6a21\u578b\u6253\u4ea4\u9053\u4e4b\u5916\uff0c\u5728\u67d0\u4e9b\u7279\u5b9a\u60c5\u51b5\u4e0b\uff0cjoin\u67e5\u8be2\u53ef\u80fd\u6bd4Eloquent\u7684\u5173\u8054\u67e5\u8be2\u66f4\u6709\u6548\u3002<\/p>\n
          \u4f8b\u5982\uff1a<\/p>\n
          $users = DB::table(‘users’)<\/p>\n
          -&gt;join('profiles', 'users.id', '=', 'profiles.user_id')\n-&gt;join('posts', 'users.id', '=', 'posts.user_id')\n-&gt;select('users.name', 'profiles.age', 'posts.title')\n-&gt;get();\n<\/pre>\n
            \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
          foreach ($users as $user) {<\/p>\n
          echo $user-&gt;name;\necho $user-&gt;age;\necho $user-&gt;title;<\/pre>\n
            \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
          }<\/p>\n
          \u867d\u7136join\u67e5\u8be2\u589e\u52a0\u4e86SQL\u8bed\u53e5\u7684\u590d\u6742\u5ea6\u548c\u53ef\u7ef4\u62a4\u6027\uff0c\u4f46\u4e0eEloquent ORM\u76f8\u6bd4\uff0cjoin\u67e5\u8be2\u53ef\u4ee5\u66f4\u597d\u5730\u4f18\u5316\u67e5\u8be2\u6027\u80fd\u3002<\/p>\n
          \u603b\u7ed3<\/p>\n
          \u4ee5\u4e0a\u51e0\u79cd\u65b9\u6cd5\u662f\u6211\u4eec\u53ef\u4ee5\u7528\u6765\u51cf\u5c11Laravel\u5173\u8054\u67e5\u8be2\u6b21\u6570\u7684\u6709\u6548\u6280\u5de7\u3002\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u9884\u52a0\u8f7d\u548c\u5ef6\u8fdf\u52a0\u8f7d\uff0c\u4ee5\u4f18\u5316\u67e5\u8be2\u6027\u80fd\uff0c\u5e76\u907f\u514d\u91cd\u590d\u67e5\u8be2\u3002\u800c\u5bf9\u4e8e\u4e00\u4e9b\u7279\u5b9a\u548c\u590d\u6742\u7684\u67e5\u8be2\uff0c\u6211\u4eec\u53ef\u4ee5\u8003\u8651\u4f7f\u7528join\u67e5\u8be2\uff0c\u4ee5\u83b7\u5f97\u66f4\u9ad8\u6548\u7684\u7ed3\u679c\u3002<\/p>\n
          \u6700\u540e\uff0c\u65e0\u8bba\u6211\u4eec\u91c7\u7528\u54ea\u79cd\u65b9\u5f0f\uff0c\u4f18\u5316\u67e5\u8be2\u603b\u662f\u5f88\u91cd\u8981\u7684\uff0c\u5b83\u53ef\u4ee5\u5927\u5927\u63d0\u9ad8\u6211\u4eec\u7684\u5e94\u7528\u6027\u80fd\uff0c\u5e76\u7f29\u77ed\u6211\u4eec\u7684\u54cd\u5e94\u65f6\u95f4\u3002<\/p>\n
          \u4ee5\u4e0a\u5c31\u662flaravel \u5173\u8054 \u67e5\u8be2\u6b21\u6570\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":"
          laravel\u662f\u4e00\u4e2a\u975e\u5e38\u6d41\u884c\u7684php\u6846\u67b6\uff0c\u62e5\u6709\u4e30\u5bcc\u7684\u7279\u6027\u548c\u6613\u7528\u7684api\u3002\u5176\u4e2d\uff0celoquent orm\u662f\u5b83\u6700\u5f3a\u5927\u7684\u6570\u636e\u5e93\u7ec4\u4ef6\u4e4b\u4e00\uff0c\u7528\u5b83\u53ef\u4ee5\u8f7b\u677e\u5730\u8fdb\u884c\u67e5\u8be2\u548c\u5173\u8054\u3002 \u7136\u800c\uff0c\u5f53\u6211\u4eec\u8fdb\u884c\u590d\u6742\u7684\u5173\u8054\u67e5\u8be2\u65f6\uff0c\u4f1a\u53d1\u73b0\u67e5\u8be2\u7684\u6b21\u6570\u53d8\u5f97\u5f88\u591a\uff0c\u7279\u522b\u662f\u5728\u4f7f\u7528\u5faa\u73af\u65f6\u3002\u8fd9\u4e0d\u4ec5\u4f1a\u5f71\u54cd\u67e5\u8be2\u6027\u80fd\uff0c\u8fd8\u53ef\u80fd\u5bfc\u81f4\u6570\u636e\u5e93\u8fde\u63a5\u5f02\u5e38\u3002 \u90a3\u4e48\uff0c\u6211\u4eec\u8be5\u5982\u4f55\u51cf\u5c11Laravel\u5173\u8054\u67e5\u8be2\u7684\u6b21\u6570\u5462\uff1f\u4e0b\u9762\uff0c\u672c\u6587\u5c06\u63d0\u4f9b\u4e00\u4e9b\u89e3\u51b3\u65b9\u6848\u3002 \u5ef6\u8fdf\u52a0\u8f7d \u5728\u8fdb\u884c\u5173\u8054\u67e5\u8be2\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528Laravel\u7684\u5ef6\u8fdf\u52a0\u8f7d\u529f\u80fd\uff0c\u5b83\u4f1a\u5728\u9700\u8981\u4f7f\u7528\u5173\u8054\u6a21\u578b\u65f6\u624d\u8fdb\u884c\u67e5\u8be2\u3002 \u5ef6\u8fdf\u52a0\u8f7d\u4f7f\u7528\u7684\u662f\u9b54\u672f\u65b9\u6cd5__get()\uff0c\u6240\u4ee5\u53ea\u8981\u5728\u5173\u8054\u6a21\u578b\u4e0a\u8c03\u7528\u65f6\uff0c\u5c31\u4f1a\u89e6\u53d1\u5173\u8054\u67e5\u8be2\u3002 \u4f8b\u5982\uff1a $users = User::all(); foreach ($users as $user) { echo $user-&gt;profile-&gt;name; \u767b\u5f55\u540e\u590d\u5236 \u767b\u5f55\u540e\u590d\u5236 } \u5982\u679c\u6211\u4eec\u76f4\u63a5\u5728foreach\u5faa\u73af\u5185\u4f7f\u7528$users->profile\uff0c\u90a3\u4e48\u5728\u6bcf\u6b21\u5faa\u73af\u5185\uff0c\u90fd\u4f1a\u6267\u884c\u4e00\u6b21\u5173\u8054\u67e5\u8be2\uff0c\u8fd9\u6837\u4f1a\u5bfc\u81f4\u67e5\u8be2\u6b21\u6570\u5f88\u591a\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5ef6\u8fdf\u52a0\u8f7d\u6765\u4f18\u5316\u5b83\u3002 $users = User::with(‘profile’)->get(); foreach ($users as $user) { echo $user-&gt;profile-&gt;name; \u767b\u5f55\u540e\u590d\u5236 \u767b\u5f55\u540e\u590d\u5236 } \u4f7f\u7528with()\u65b9\u6cd5\u9884\u52a0\u8f7d\u5173\u8054\u6a21\u578b\u65f6\uff0c\u5ef6\u8fdf\u52a0\u8f7d\u4f1a\u81ea\u52a8\u542f\u7528\uff0c\u53ea\u6709\u5728\u9700\u8981\u4f7f\u7528\u5173\u8054\u6a21\u578b\u65f6\u624d\u8fdb\u884c\u67e5\u8be2\u3002 Eager Loading \u5ef6\u8fdf\u52a0\u8f7d\u53ea\u8981\u6211\u4eec\u624b\u52a8\u53bb\u8c03\u7528\uff0c\u5982\u679c\u6211\u4eec\u6ca1\u6709\u5bf9\u4ee3\u7801\u505a\u5168\u9762\u7684\u68c0\u67e5\uff0c\u4ecd\u7136\u4f1a\u51fa\u73b0\u91cd\u590d\u67e5\u8be2\u7684\u60c5\u51b5\uff0c\u6240\u4ee5\u66f4\u5f7b\u5e95\u7684\u89e3\u51b3\u65b9\u6cd5\u662f\u4f7f\u7528Eager Loading\uff08\u9884\u52a0\u8f7d\uff09\uff0c\u5b83\u53ef\u4ee5\u4e00\u6b21\u6027\u52a0\u8f7d\u6240\u6709\u9700\u8981\u7684\u5173\u8054\u6a21\u578b\u3002 \u4f8b\u5982\uff1a $users = User::with(‘profile’, ‘posts’)->get(); foreach ($users as $user) { echo $user-&gt;profile-&gt;name; foreach ($user->posts as […]<\/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-23014","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/23014","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=23014"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/23014\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=23014"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=23014"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=23014"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}