{"id":22584,"date":"2024-11-21T11:17:05","date_gmt":"2024-11-21T03:17:05","guid":{"rendered":"https:\/\/fwq.ai\/blog\/22584\/"},"modified":"2024-11-21T11:17:05","modified_gmt":"2024-11-21T03:17:05","slug":"laravel%e5%a4%9a%e8%a1%a8%e6%9f%a5%e8%af%a2%e6%8e%92%e5%ba%8f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/22584\/","title":{"rendered":"laravel\u591a\u8868\u67e5\u8be2\u6392\u5e8f"},"content":{"rendered":"<p>\u968f\u7740\u4e92\u8054\u7f51\u6280\u672f\u7684\u53d1\u5c55\uff0cweb\u5e94\u7528\u7a0b\u5e8f\u7684\u9700\u6c42\u8d8a\u6765\u8d8a\u590d\u6742\uff0c\u6d89\u53ca\u5230\u591a\u4e2a\u6570\u636e\u8868\u7684\u5173\u8054\u67e5\u8be2\u548c\u6392\u5e8f\u3002\u4f5c\u4e3a\u4e00\u6b3e\u9ad8\u6548\u3001\u7075\u6d3b\u7684 php \u5f00\u6e90\u6846\u67b6\uff0claravel \u63d0\u4f9b\u4e86\u5f88\u591a\u65b9\u4fbf\u7684\u65b9\u6cd5\u6765\u7ba1\u7406\u548c\u67e5\u8be2\u591a\u4e2a\u6570\u636e\u8868\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528 laravel \u8fdb\u884c\u591a\u8868\u67e5\u8be2\u548c\u6392\u5e8f\u3002<\/p>\n<ol>\n<li>\u591a\u8868\u67e5\u8be2<\/li>\n<\/ol>\n<p>\u5728 Laravel \u4e2d\uff0c\u4f7f\u7528 Eloquent ORM \u53ef\u4ee5\u8f7b\u677e\u5b9e\u73b0\u591a\u8868\u67e5\u8be2\u3002 Eloquent \u662f\u4e00\u4e2a\u5f3a\u5927\u7684 ORM\uff0c\u53ef\u4ee5\u5c06\u6570\u636e\u5e93\u8868\u6620\u5c04\u5230 PHP \u5bf9\u8c61\uff0c\u5e76\u63d0\u4f9b\u4e86\u591a\u79cd\u67e5\u8be2\u65b9\u6cd5\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5047\u8bbe\u6211\u4eec\u6709\u4e24\u4e2a\u8868\uff1ausers\uff08\u7528\u6237\uff09\u548cposts\uff08\u6587\u7ae0\uff09\uff0c\u5176\u4e2d\u6587\u7ae0\u8868\u4e2d\u6709\u4e00\u4e2a\u5916\u952e user_id \u5b58\u50a8\u4e86\u53d1\u5e03\u8be5\u6587\u7ae0\u7684\u7528\u6237 id\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u6765\u67e5\u8be2\u4e00\u4e2a\u7528\u6237\u53d1\u5e03\u7684\u6240\u6709\u6587\u7ae0\uff1a<\/p>\n<pre>$user = User::find(1);\n$posts = $user-&amp;gt;posts;<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u8fd9\u91cc\u9996\u5148\u901a\u8fc7 User \u6a21\u578b\u7684 find \u65b9\u6cd5\u83b7\u53d6\u5bf9\u5e94 ID \u7684\u7528\u6237\u5bf9\u8c61\uff0c\u7136\u540e\u901a\u8fc7\u8bbf\u95ee $user-&gt;posts \u5c5e\u6027\u6765\u83b7\u53d6\u8be5\u7528\u6237\u53d1\u5e03\u7684\u6240\u6709\u6587\u7ae0\u3002 \u8fd9\u79cd\u65b9\u5f0f\u5b9e\u9645\u4e0a\u662f Eloquent \u7684\u4e00\u79cd\u5173\u7cfb\uff0c\u5728 User \u6a21\u578b\u4e2d\u5b9a\u4e49\u4e86\u4e00\u4e2a\u53eb\u505a posts \u7684\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u5b9a\u4e49\u4e86 User \u6a21\u578b\u548c Post \u6a21\u578b\u4e4b\u95f4\u7684\u5173\u7cfb\u3002<\/p>\n<p>\u8fd8\u53ef\u4ee5\u4f7f\u7528 with \u65b9\u6cd5\u8fdb\u884c\u9884\u52a0\u8f7d\uff0c\u907f\u514d\u5728\u904d\u5386\u7528\u6237\u65f6\u6267\u884c\u591a\u4e2a\u67e5\u8be2\uff0c\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\uff1a<\/p>\n<pre>$users = User::with('posts')-&amp;gt;get();\nforeach ($users as $user) {\n    $posts = $user-&amp;gt;posts;\n}<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u8fd9\u91cc\u4f7f\u7528 with \u65b9\u6cd5\u9884\u52a0\u8f7d\u4e86\u6240\u6709\u7528\u6237\u7684\u6240\u6709\u6587\u7ae0\uff0c\u7136\u540e\u5728\u5faa\u73af\u4e2d\u8bbf\u95ee $user-&gt;posts \u5c5e\u6027\uff0c\u53ef\u4ee5\u907f\u514d\u5728\u5faa\u73af\u4e2d\u6267\u884c\u591a\u4e2a\u67e5\u8be2\u3002<\/p>\n<p>\u9664\u4e86 Eloquent \u63d0\u4f9b\u7684\u6a21\u578b\u5173\u7cfb\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528 join \u65b9\u6cd5\u6765\u6267\u884c\u590d\u6742\u7684\u591a\u8868\u67e5\u8be2\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u4ee3\u7801\u5c06\u67e5\u8be2\u6bcf\u7bc7\u6587\u7ae0\u5bf9\u5e94\u7684\u4f5c\u8005\u548c\u8bc4\u8bba\u6570\uff1a<\/p>\n<pre>$posts = DB::table('posts')\n            -&amp;gt;join('users', 'posts.user_id', '=', 'users.id')\n            -&amp;gt;leftJoin('comments', 'posts.id', '=', 'comments.post_id')\n            -&amp;gt;select('posts.*', 'users.name', DB::raw('count(comments.id) as comments_count'))\n            -&amp;gt;groupBy('posts.id')\n            -&amp;gt;get();<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u8fd9\u91cc\u4f7f\u7528\u4e86 join \u548c leftJoin \u65b9\u6cd5\u6765\u8fde\u63a5\u4e09\u4e2a\u8868\uff0c\u7136\u540e\u4f7f\u7528 select \u65b9\u6cd5\u9009\u62e9\u8981\u67e5\u8be2\u7684\u5b57\u6bb5\uff0c\u5176\u4e2d\u4f7f\u7528\u4e86 DB::raw \u65b9\u6cd5\u6765\u751f\u6210\u539f\u59cb\u67e5\u8be2\u8bed\u53e5\u4e2d\u7684 count(comments.id) \u90e8\u5206\u3002\u6700\u540e\u4f7f\u7528 groupBy \u65b9\u6cd5\u5bf9\u6587\u7ae0\u8fdb\u884c\u5206\u7ec4\u3002<\/p>\n<ol>\n<li>\u591a\u8868\u6392\u5e8f<\/li>\n<\/ol>\n<p>\u5728\u591a\u8868\u67e5\u8be2\u7684\u57fa\u7840\u4e0a\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u5bf9\u67e5\u8be2\u7ed3\u679c\u8fdb\u884c\u6392\u5e8f\u3002 Laravel \u63d0\u4f9b\u4e86\u591a\u79cd\u6392\u5e8f\u65b9\u5f0f\u6765\u6ee1\u8db3\u4e0d\u540c\u9700\u6c42\u3002<\/p>\n<p>2.1 \u5355\u8868\u6392\u5e8f <\/p>\n<p>\u5bf9\u4e8e\u5355\u8868\u6392\u5e8f\uff0cLaravel \u63d0\u4f9b\u4e86 orderBy \u65b9\u6cd5\uff0c\u53ef\u4ee5\u6839\u636e\u6307\u5b9a\u7684\u5b57\u6bb5\u6392\u5e8f\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre>$users = User::orderBy('name', 'desc')-&amp;gt;get();<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u8fd9\u91cc\u6309\u7167 name \u5b57\u6bb5\u964d\u5e8f\u6392\u5e8f\u6240\u6709\u7528\u6237\u3002<\/p>\n<p>2.2 \u5173\u8054\u8868\u6392\u5e8f <\/p>\n<p>\u5bf9\u4e8e\u5173\u8054\u8868\u6392\u5e8f\uff0c\u53ef\u4ee5\u5728\u5173\u8054\u65b9\u6cd5\u4e2d\u5b9a\u4e49 orderBy\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre>class User extends Model\n{\n    public function posts()\n    {\n        return $this-&amp;gt;hasMany(Post::class)-&amp;gt;orderBy('created_at', 'desc');\n    }\n}<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u8fd9\u91cc\u5728 User \u6a21\u578b\u7684 posts \u65b9\u6cd5\u4e2d\u5b9a\u4e49\u4e86 orderBy\uff0c\u6bcf\u6b21\u8c03\u7528 $user-&gt;posts \u65f6\uff0c\u90fd\u4f1a\u6309\u7167 created_at \u5b57\u6bb5\u964d\u5e8f\u6392\u5e8f\u6587\u7ae0\u3002<\/p>\n<p>2.3 \u591a\u8868\u6392\u5e8f <\/p>\n<p>\u5bf9\u4e8e\u591a\u8868\u6392\u5e8f\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 join \u548c orderBy \u65b9\u6cd5\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre>$posts = DB::table('posts')\n            -&amp;gt;join('users', 'posts.user_id', '=', 'users.id')\n            -&amp;gt;orderBy('users.name', 'desc')\n            -&amp;gt;orderBy('posts.created_at', 'desc')\n            -&amp;gt;get();<\/pre>\n<p>  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n<p>\u8fd9\u91cc\u6309\u7167\u7528\u6237\u7684 name \u5b57\u6bb5\u964d\u5e8f\u6392\u5e8f\uff0c\u7136\u540e\u6309\u7167\u6587\u7ae0\u7684 created_at \u5b57\u6bb5\u964d\u5e8f\u6392\u5e8f\u3002<\/p>\n<ol>\n<li>\u603b\u7ed3<\/li>\n<\/ol>\n<p>Laravel \u63d0\u4f9b\u4e86\u591a\u79cd\u65b9\u4fbf\u7684\u65b9\u6cd5\u6765\u67e5\u8be2\u548c\u6392\u5e8f\u591a\u4e2a\u6570\u636e\u8868\uff0c\u5305\u62ec Eloquent \u6a21\u578b\u5173\u7cfb\u3001join \u65b9\u6cd5\u3001orderBy \u65b9\u6cd5\u7b49\u3002\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u4e0d\u540c\u7684\u65b9\u6cd5\u8fdb\u884c\u67e5\u8be2\u548c\u6392\u5e8f\uff0c\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\u548c\u4ee3\u7801\u7b80\u6d01\u5ea6\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662flaravel\u591a\u8868\u67e5\u8be2\u6392\u5e8f\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":"<p>\u968f\u7740\u4e92\u8054\u7f51\u6280\u672f\u7684\u53d1\u5c55\uff0cweb\u5e94\u7528\u7a0b\u5e8f\u7684\u9700\u6c42\u8d8a\u6765\u8d8a\u590d\u6742\uff0c\u6d89\u53ca\u5230\u591a\u4e2a\u6570\u636e\u8868\u7684\u5173\u8054\u67e5\u8be2\u548c\u6392\u5e8f\u3002\u4f5c\u4e3a\u4e00\u6b3e\u9ad8\u6548\u3001\u7075\u6d3b\u7684 php \u5f00\u6e90\u6846\u67b6\uff0claravel \u63d0\u4f9b\u4e86\u5f88\u591a\u65b9\u4fbf\u7684\u65b9\u6cd5\u6765\u7ba1\u7406\u548c\u67e5\u8be2\u591a\u4e2a\u6570\u636e\u8868\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528 laravel \u8fdb\u884c\u591a\u8868\u67e5\u8be2\u548c\u6392\u5e8f\u3002 \u591a\u8868\u67e5\u8be2 \u5728 Laravel \u4e2d\uff0c\u4f7f\u7528 Eloquent ORM \u53ef\u4ee5\u8f7b\u677e\u5b9e\u73b0\u591a\u8868\u67e5\u8be2\u3002 Eloquent \u662f\u4e00\u4e2a\u5f3a\u5927\u7684 ORM\uff0c\u53ef\u4ee5\u5c06\u6570\u636e\u5e93\u8868\u6620\u5c04\u5230 PHP \u5bf9\u8c61\uff0c\u5e76\u63d0\u4f9b\u4e86\u591a\u79cd\u67e5\u8be2\u65b9\u6cd5\u3002 \u4f8b\u5982\uff0c\u5047\u8bbe\u6211\u4eec\u6709\u4e24\u4e2a\u8868\uff1ausers\uff08\u7528\u6237\uff09\u548cposts\uff08\u6587\u7ae0\uff09\uff0c\u5176\u4e2d\u6587\u7ae0\u8868\u4e2d\u6709\u4e00\u4e2a\u5916\u952e user_id \u5b58\u50a8\u4e86\u53d1\u5e03\u8be5\u6587\u7ae0\u7684\u7528\u6237 id\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u6765\u67e5\u8be2\u4e00\u4e2a\u7528\u6237\u53d1\u5e03\u7684\u6240\u6709\u6587\u7ae0\uff1a $user = User::find(1); $posts = $user-&amp;gt;posts; \u767b\u5f55\u540e\u590d\u5236 \u8fd9\u91cc\u9996\u5148\u901a\u8fc7 User \u6a21\u578b\u7684 find \u65b9\u6cd5\u83b7\u53d6\u5bf9\u5e94 ID \u7684\u7528\u6237\u5bf9\u8c61\uff0c\u7136\u540e\u901a\u8fc7\u8bbf\u95ee $user-&gt;posts \u5c5e\u6027\u6765\u83b7\u53d6\u8be5\u7528\u6237\u53d1\u5e03\u7684\u6240\u6709\u6587\u7ae0\u3002 \u8fd9\u79cd\u65b9\u5f0f\u5b9e\u9645\u4e0a\u662f Eloquent \u7684\u4e00\u79cd\u5173\u7cfb\uff0c\u5728 User \u6a21\u578b\u4e2d\u5b9a\u4e49\u4e86\u4e00\u4e2a\u53eb\u505a posts \u7684\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u5b9a\u4e49\u4e86 User \u6a21\u578b\u548c Post \u6a21\u578b\u4e4b\u95f4\u7684\u5173\u7cfb\u3002 \u8fd8\u53ef\u4ee5\u4f7f\u7528 with \u65b9\u6cd5\u8fdb\u884c\u9884\u52a0\u8f7d\uff0c\u907f\u514d\u5728\u904d\u5386\u7528\u6237\u65f6\u6267\u884c\u591a\u4e2a\u67e5\u8be2\uff0c\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\uff1a $users = User::with(&#8216;posts&#8217;)-&amp;gt;get(); [&hellip;]<\/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-22584","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/22584","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=22584"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/22584\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=22584"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=22584"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=22584"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}