{"id":48085,"date":"2022-11-21T05:59:41","date_gmt":"2023-06-04T06:38:52","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e6%83%b3%e5%9c%a8rdb%e4%b8%ad%e4%bd%bf%e7%94%a8graphql%e3%80%82\/"},"modified":"2024-04-29T01:45:23","modified_gmt":"2024-04-28T17:45:23","slug":"%e6%88%91%e6%83%b3%e5%9c%a8rdb%e4%b8%ad%e4%bd%bf%e7%94%a8graphql%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e6%83%b3%e5%9c%a8rdb%e4%b8%ad%e4%bd%bf%e7%94%a8graphql%e3%80%82\/","title":{"rendered":"\u6211\u60f3\u5728RDB\u4e2d\u4f7f\u7528GraphQL"},"content":{"rendered":"<h1>\u9996\u5148<\/h1>\n<p>\u5c31\u50cf\u6807\u9898\u6240\u8bf4\u7684\u90a3\u6837\uff0c\u6211\u60f3\u5728\u5173\u7cfb\u578b\u6570\u636e\u5e93\uff08MySQL\uff09\u4e2d\u4f7f\u7528GraphQL\uff0c\u5c3d\u7ba1\u6211\u5e73\u65f6\u5e76\u4e0d\u4f7f\u7528\u5b83\uff0c\u4f46\u6211\u8fd8\u662f\u5c1d\u8bd5\u7528Node\u7f16\u5199\u4e86\u4e00\u4e0b\u3002<\/p>\n<p>\uff01\uff01\u4f46\u9700\u8981\u53ea\u8bfb\u7684\u4e2d\u6587\u9009\u9879\uff01\uff01<\/p>\n<p>\u56e0\u4e3a\u76f4\u63a5\u8c03\u7528ORM\u7684\u65b9\u6cd5\u8fdb\u884c\u5199\u5165\u66f4\u65b9\u4fbf\u3002<\/p>\n<p>\u73af\u5883<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">MySQL 5.7<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Node 10.11<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">NPM 6.4<\/ul>\n<p>\u8fd9\u662f\u53ef\u5728GitHub\u4e0a\u8bbf\u95ee\u5230\u7684\u6210\u679c\u7269\u94fe\u63a5\uff1ahttps:\/\/github.com\/lightstaff\/graphql-with-sequelize<\/p>\n<h1>\u51c6\u5907<\/h1>\n<p>\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u9002\u5f53\u7684npm init\u7b49\u547d\u4ee4\u521b\u5efa\u9879\u76ee\uff0c\u5e76\u5b89\u88c5\u6240\u9700\u7684\u5e93\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"gp\">$<\/span>: npm <span class=\"nb\">install<\/span> <span class=\"nt\">--save<\/span> apollo-server dataloader-sequelize graphql mysql2 sequelize\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">apollo-server&#8230;GraphQL\u30b5\u30fc\u30d0\u30fc\u3092\u7c21\u5358\u306b\u7acb\u3061\u4e0a\u3052\u3066\u304f\u308c\u308b\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">graphql&#8230;\u4e3b\u5f79<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">sequelize&#8230;ORM\u30e9\u30a4\u30d6\u30e9\u30ea<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">dataloader-sequelize&#8230;N+1\u3092\u89e3\u6c7a\u3057\u3066\u304f\u308c\u308b\u3089\u3057\u3044<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">mysql2&#8230;MySQL\u30c9\u30e9\u30a4\u30d0<\/ul>\n<h1>\u5173\u7cfb\u6570\u636e\u5e93\uff08RDB\uff09\u7684\u4e00\u4fa7<\/h1>\n<p>\u6211\u4eec\u5728ORM\u4e2d\u4f7f\u7528Sequelize\uff0c\u4f46\u7531\u4e8e\u6211\u521a\u5f00\u59cb\u4f7f\u7528\uff0c\u5e76\u4e0d\u4f1a\u8be6\u7ec6\u89e3\u91ca\u3002\u8bf7\u67e5\u770bSequelize\u7684\u5b98\u65b9\u6587\u6863\u6216\u5b98\u65b9\u793a\u4f8b\u4ee5\u83b7\u53d6\u66f4\u591a\u8be6\u7ec6\u4fe1\u606f\u3002<\/p>\n<p>\u521b\u5efa\u4e00\u4e2a\u540d\u4e3amodels\u7684\u76ee\u5f55\uff0c\u7136\u540e\u5728\u5176\u4e2d\u521b\u5efaUser\u548cEMail\u4e24\u4e2a\u6a21\u578b\u3002<\/p>\n<p>\u7528\u6237\u25cb&#8211;&lt; \u90ae\u4ef6\u4e4b\u95f4\u7684\u5173\u7cfb\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nx\">module<\/span><span class=\"p\">.<\/span><span class=\"nx\">exports<\/span> <span class=\"o\">=<\/span> <span class=\"p\">(<\/span><span class=\"nx\">sequelize<\/span><span class=\"p\">,<\/span> <span class=\"nx\">DataTypes<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">User<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">sequelize<\/span><span class=\"p\">.<\/span><span class=\"nx\">define<\/span><span class=\"p\">(<\/span>\r\n    <span class=\"dl\">'<\/span><span class=\"s1\">user<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"p\">{<\/span>\r\n      <span class=\"na\">id<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"na\">type<\/span><span class=\"p\">:<\/span> <span class=\"nx\">DataTypes<\/span><span class=\"p\">.<\/span><span class=\"nx\">INTEGER<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"na\">primaryKey<\/span><span class=\"p\">:<\/span> <span class=\"kc\">true<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"na\">autoIncrement<\/span><span class=\"p\">:<\/span> <span class=\"kc\">true<\/span><span class=\"p\">,<\/span>\r\n      <span class=\"p\">},<\/span>\r\n      <span class=\"na\">name<\/span><span class=\"p\">:<\/span> <span class=\"nx\">DataTypes<\/span><span class=\"p\">.<\/span><span class=\"nx\">STRING<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"p\">},<\/span>\r\n    <span class=\"p\">{<\/span>\r\n      <span class=\"na\">timestamps<\/span><span class=\"p\">:<\/span> <span class=\"kc\">false<\/span><span class=\"p\">,<\/span>\r\n      <span class=\"na\">tableName<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">user<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"p\">}<\/span>\r\n  <span class=\"p\">);<\/span>\r\n\r\n  <span class=\"nx\">User<\/span><span class=\"p\">.<\/span><span class=\"nx\">associate<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">models<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nx\">User<\/span><span class=\"p\">.<\/span><span class=\"nx\">hasMany<\/span><span class=\"p\">(<\/span><span class=\"nx\">models<\/span><span class=\"p\">.<\/span><span class=\"nx\">email<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">};<\/span>\r\n\r\n  <span class=\"k\">return<\/span> <span class=\"nx\">User<\/span><span class=\"p\">;<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"nx\">module<\/span><span class=\"p\">.<\/span><span class=\"nx\">exports<\/span> <span class=\"o\">=<\/span> <span class=\"p\">(<\/span><span class=\"nx\">sequelize<\/span><span class=\"p\">,<\/span> <span class=\"nx\">DataTypes<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">EMail<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">sequelize<\/span><span class=\"p\">.<\/span><span class=\"nx\">define<\/span><span class=\"p\">(<\/span>\r\n    <span class=\"dl\">'<\/span><span class=\"s1\">email<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"p\">{<\/span>\r\n      <span class=\"na\">id<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"na\">type<\/span><span class=\"p\">:<\/span> <span class=\"nx\">DataTypes<\/span><span class=\"p\">.<\/span><span class=\"nx\">INTEGER<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"na\">primaryKey<\/span><span class=\"p\">:<\/span> <span class=\"kc\">true<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"na\">autoIncrement<\/span><span class=\"p\">:<\/span> <span class=\"kc\">true<\/span><span class=\"p\">,<\/span>\r\n      <span class=\"p\">},<\/span>\r\n      <span class=\"na\">address<\/span><span class=\"p\">:<\/span> <span class=\"nx\">DataTypes<\/span><span class=\"p\">.<\/span><span class=\"nx\">STRING<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"p\">},<\/span>\r\n    <span class=\"p\">{<\/span>\r\n      <span class=\"na\">timestamps<\/span><span class=\"p\">:<\/span> <span class=\"kc\">false<\/span><span class=\"p\">,<\/span>\r\n      <span class=\"na\">tableName<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">email<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"p\">}<\/span>\r\n  <span class=\"p\">);<\/span>\r\n\r\n  <span class=\"nx\">EMail<\/span><span class=\"p\">.<\/span><span class=\"nx\">associate<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">models<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nx\">EMail<\/span><span class=\"p\">.<\/span><span class=\"nx\">belongsTo<\/span><span class=\"p\">(<\/span><span class=\"nx\">models<\/span><span class=\"p\">.<\/span><span class=\"nx\">user<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">};<\/span>\r\n\r\n  <span class=\"k\">return<\/span> <span class=\"nx\">EMail<\/span><span class=\"p\">;<\/span>\r\n<span class=\"p\">};<\/span>\r\n<\/code><\/pre>\n<p>\u4e3a\u4e86\u80fd\u591f\u8bbf\u95ee\u8fd9\u4e9b\u5185\u5bb9\uff0c\u6211\u4eec\u4e5f\u9700\u8981\u5b9a\u4e49\u6570\u636e\u5e93\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">Sequelize<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">require<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">sequelize<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">sequelize<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nx\">Sequelize<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">test<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">root<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">1234<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"na\">dialect<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">mysql<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"na\">host<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">localhost<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"na\">port<\/span><span class=\"p\">:<\/span> <span class=\"mi\">3306<\/span><span class=\"p\">,<\/span>\r\n<span class=\"p\">});<\/span>\r\n\r\n<span class=\"nx\">module<\/span><span class=\"p\">.<\/span><span class=\"nx\">exports<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">sequelize<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">fs<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">require<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">fs<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">path<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">require<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">path<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">Sequelize<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">require<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">sequelize<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">sequelize<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">require<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">..\/database<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">db<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"nx\">sequelize<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"nx\">Sequelize<\/span><span class=\"p\">,<\/span>\r\n<span class=\"p\">};<\/span>\r\n\r\n<span class=\"nx\">fs<\/span><span class=\"p\">.<\/span><span class=\"nx\">readdirSync<\/span><span class=\"p\">(<\/span><span class=\"nx\">__dirname<\/span><span class=\"p\">)<\/span>\r\n  <span class=\"p\">.<\/span><span class=\"nx\">filter<\/span><span class=\"p\">(<\/span><span class=\"nx\">file<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">path<\/span><span class=\"p\">.<\/span><span class=\"nx\">extname<\/span><span class=\"p\">(<\/span><span class=\"nx\">file<\/span><span class=\"p\">)<\/span> <span class=\"o\">===<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">.js<\/span><span class=\"dl\">'<\/span> <span class=\"o\">&amp;&amp;<\/span> <span class=\"nx\">file<\/span> <span class=\"o\">!==<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">index.js<\/span><span class=\"dl\">'<\/span><span class=\"p\">)<\/span>\r\n  <span class=\"p\">.<\/span><span class=\"nx\">forEach<\/span><span class=\"p\">(<\/span><span class=\"nx\">file<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">model<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">sequelize<\/span><span class=\"p\">.<\/span><span class=\"k\">import<\/span><span class=\"p\">(<\/span><span class=\"nx\">path<\/span><span class=\"p\">.<\/span><span class=\"nx\">join<\/span><span class=\"p\">(<\/span><span class=\"nx\">__dirname<\/span><span class=\"p\">,<\/span> <span class=\"nx\">file<\/span><span class=\"p\">));<\/span>\r\n    <span class=\"nx\">db<\/span><span class=\"p\">[<\/span><span class=\"nx\">model<\/span><span class=\"p\">.<\/span><span class=\"nx\">name<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">model<\/span><span class=\"p\">;<\/span>\r\n  <span class=\"p\">});<\/span>\r\n\r\n<span class=\"nb\">Object<\/span><span class=\"p\">.<\/span><span class=\"nx\">keys<\/span><span class=\"p\">(<\/span><span class=\"nx\">db<\/span><span class=\"p\">).<\/span><span class=\"nx\">forEach<\/span><span class=\"p\">(<\/span><span class=\"nx\">modelName<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"k\">if<\/span> <span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">associate<\/span><span class=\"dl\">'<\/span> <span class=\"k\">in<\/span> <span class=\"nx\">db<\/span><span class=\"p\">[<\/span><span class=\"nx\">modelName<\/span><span class=\"p\">])<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nx\">db<\/span><span class=\"p\">[<\/span><span class=\"nx\">modelName<\/span><span class=\"p\">].<\/span><span class=\"nx\">associate<\/span><span class=\"p\">(<\/span><span class=\"nx\">db<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">}<\/span>\r\n<span class=\"p\">});<\/span>\r\n\r\n<span class=\"nx\">module<\/span><span class=\"p\">.<\/span><span class=\"nx\">exports<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">db<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<h1>GraphQL\u7684\u4e00\u4fa7<\/h1>\n<p>\u7ec8\u4e8e\u8c08\u5230\u6b63\u9898\u4e86\u3002<\/p>\n<p>\u4f7f\u7528ApolloServer\u4f3c\u4e4e\u53ef\u4ee5\u8f7b\u677e\u6784\u5efa\u3002<\/p>\n<p>\u7531\u4e8e\u975e\u5e38\u7b80\u5355\uff0c\u6240\u4ee5\u6211\u5148\u63d0\u4f9b\u6e90\u4ee3\u7801\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"nx\">apolloServer<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">require<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">apollo-server<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">dataLoaderSequelize<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">require<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">dataloader-sequelize<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">db<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">require<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">.\/models<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\r\n\r\n<span class=\"kd\">const<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">ApolloServer<\/span><span class=\"p\">,<\/span> <span class=\"nx\">gql<\/span> <span class=\"p\">}<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">apolloServer<\/span><span class=\"p\">;<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">createContext<\/span><span class=\"p\">,<\/span> <span class=\"nx\">EXPECTED_OPTIONS_KEY<\/span> <span class=\"p\">}<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">dataLoaderSequelize<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"c1\">\/\/ GraphQL schema<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">typeDefs<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">gql<\/span><span class=\"s2\">`\r\n  type User {\r\n    id: ID!\r\n    name: String\r\n    emails: [Email!]!\r\n  }\r\n\r\n  type Email {\r\n    id: ID!\r\n    address: String\r\n    user: User!\r\n  }\r\n\r\n  type Query {\r\n    users: [User!]!\r\n    user(id: ID!): User\r\n  }\r\n`<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"c1\">\/\/ GraphQL &lt;-&gt; ORM<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">resolvers<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"na\">User<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"na\">emails<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"nx\">parent<\/span><span class=\"p\">,<\/span> <span class=\"nx\">args<\/span><span class=\"p\">,<\/span> <span class=\"nx\">context<\/span><span class=\"p\">,<\/span> <span class=\"nx\">info<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">parent<\/span><span class=\"p\">.<\/span><span class=\"nx\">getEmails<\/span><span class=\"p\">(),<\/span>\r\n  <span class=\"p\">},<\/span>\r\n  <span class=\"na\">Email<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"na\">user<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"nx\">parent<\/span><span class=\"p\">,<\/span> <span class=\"nx\">args<\/span><span class=\"p\">,<\/span> <span class=\"nx\">context<\/span><span class=\"p\">,<\/span> <span class=\"nx\">info<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">parent<\/span><span class=\"p\">.<\/span><span class=\"nx\">getUser<\/span><span class=\"p\">(),<\/span>\r\n  <span class=\"p\">},<\/span>\r\n  <span class=\"na\">Query<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"na\">users<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"nx\">parent<\/span><span class=\"p\">,<\/span> <span class=\"nx\">args<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">db<\/span><span class=\"p\">,<\/span> <span class=\"nx\">eok<\/span> <span class=\"p\">},<\/span> <span class=\"nx\">info<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span>\r\n      <span class=\"nx\">db<\/span><span class=\"p\">.<\/span><span class=\"nx\">user<\/span><span class=\"p\">.<\/span><span class=\"nx\">findAll<\/span><span class=\"p\">({<\/span> <span class=\"p\">[<\/span><span class=\"nx\">EXPECTED_OPTIONS_KEY<\/span><span class=\"p\">]:<\/span> <span class=\"nx\">eok<\/span> <span class=\"p\">}),<\/span>\r\n    <span class=\"na\">user<\/span><span class=\"p\">:<\/span> <span class=\"p\">(<\/span><span class=\"nx\">parent<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">id<\/span> <span class=\"p\">},<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">db<\/span><span class=\"p\">,<\/span> <span class=\"nx\">eok<\/span> <span class=\"p\">},<\/span> <span class=\"nx\">info<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span>\r\n      <span class=\"nx\">db<\/span><span class=\"p\">.<\/span><span class=\"nx\">user<\/span><span class=\"p\">.<\/span><span class=\"nx\">findById<\/span><span class=\"p\">(<\/span><span class=\"nx\">id<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span> <span class=\"p\">[<\/span><span class=\"nx\">EXPECTED_OPTIONS_KEY<\/span><span class=\"p\">]:<\/span> <span class=\"nx\">eok<\/span> <span class=\"p\">}),<\/span>\r\n  <span class=\"p\">},<\/span>\r\n<span class=\"p\">};<\/span>\r\n\r\n<span class=\"c1\">\/\/ Apollo server<\/span>\r\n<span class=\"kd\">const<\/span> <span class=\"nx\">server<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nx\">ApolloServer<\/span><span class=\"p\">({<\/span>\r\n  <span class=\"nx\">typeDefs<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"nx\">resolvers<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"na\">context<\/span><span class=\"p\">:<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"na\">db<\/span><span class=\"p\">:<\/span> <span class=\"nx\">db<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"na\">eok<\/span><span class=\"p\">:<\/span> <span class=\"nx\">createContext<\/span><span class=\"p\">(<\/span><span class=\"nx\">db<\/span><span class=\"p\">.<\/span><span class=\"nx\">sequelize<\/span><span class=\"p\">),<\/span>\r\n  <span class=\"p\">},<\/span>\r\n<span class=\"p\">});<\/span>\r\n\r\n<span class=\"c1\">\/\/ Entry point<\/span>\r\n<span class=\"k\">async<\/span> <span class=\"kd\">function<\/span> <span class=\"nx\">start<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"k\">await<\/span> <span class=\"nx\">db<\/span><span class=\"p\">.<\/span><span class=\"nx\">sequelize<\/span><span class=\"p\">.<\/span><span class=\"nx\">sync<\/span><span class=\"p\">({<\/span> <span class=\"na\">force<\/span><span class=\"p\">:<\/span> <span class=\"kc\">true<\/span> <span class=\"p\">});<\/span>\r\n\r\n  <span class=\"c1\">\/\/ Setup dummy<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">userA<\/span> <span class=\"o\">=<\/span> <span class=\"k\">await<\/span> <span class=\"nx\">db<\/span><span class=\"p\">.<\/span><span class=\"nx\">user<\/span><span class=\"p\">.<\/span><span class=\"nx\">create<\/span><span class=\"p\">({<\/span> <span class=\"na\">name<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">A<\/span><span class=\"dl\">'<\/span> <span class=\"p\">});<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"nx\">userB<\/span> <span class=\"o\">=<\/span> <span class=\"k\">await<\/span> <span class=\"nx\">db<\/span><span class=\"p\">.<\/span><span class=\"nx\">user<\/span><span class=\"p\">.<\/span><span class=\"nx\">create<\/span><span class=\"p\">({<\/span> <span class=\"na\">name<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">B<\/span><span class=\"dl\">'<\/span> <span class=\"p\">});<\/span>\r\n  <span class=\"k\">await<\/span> <span class=\"nx\">userA<\/span><span class=\"p\">.<\/span><span class=\"nx\">createEmail<\/span><span class=\"p\">({<\/span> <span class=\"na\">address<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">A1@e-mail.com<\/span><span class=\"dl\">'<\/span> <span class=\"p\">});<\/span>\r\n  <span class=\"k\">await<\/span> <span class=\"nx\">userA<\/span><span class=\"p\">.<\/span><span class=\"nx\">createEmail<\/span><span class=\"p\">({<\/span> <span class=\"na\">address<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">A2@e-mail.com<\/span><span class=\"dl\">'<\/span> <span class=\"p\">});<\/span>\r\n  <span class=\"k\">await<\/span> <span class=\"nx\">userB<\/span><span class=\"p\">.<\/span><span class=\"nx\">createEmail<\/span><span class=\"p\">({<\/span> <span class=\"na\">address<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">B1@e-mail.com<\/span><span class=\"dl\">'<\/span> <span class=\"p\">});<\/span>\r\n\r\n  <span class=\"nx\">server<\/span><span class=\"p\">.<\/span><span class=\"nx\">listen<\/span><span class=\"p\">().<\/span><span class=\"nx\">then<\/span><span class=\"p\">(({<\/span> <span class=\"nx\">url<\/span> <span class=\"p\">})<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nx\">log<\/span><span class=\"p\">(<\/span><span class=\"s2\">`? Server ready at <\/span><span class=\"p\">${<\/span><span class=\"nx\">url<\/span><span class=\"p\">}<\/span><span class=\"s2\">`<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">});<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"nx\">start<\/span><span class=\"p\">();<\/span>\r\n<\/code><\/pre>\n<p>\u8fd9\u4e2a\u975e\u5e38\u7b80\u5355\uff0c\u4e0d\u9700\u8981\u89e3\u91ca\u7684\u2026\u2026<\/p>\n<p>\u4f7f\u7528const typeDefs = &#8230;\u6765\u5b9a\u4e49GraphQL\u7684\u6a21\u5f0f\u3002<\/p>\n<p>const resolvers = &#8230;\u4e3aGraphQl\u6a21\u5f0f\u8c03\u7528\u6570\u636e\u5e93\u5e76\u5b9a\u4e49\u89e3\u6790\u5668\u3002<\/p>\n<p>\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u4f7f\u7528&#8230;\u521b\u5efa\u4e86ApolloServer\uff0c\u5e76\u5c06\u6570\u636e\u5e93\u7b49\u6570\u636e\u63d0\u4f9b\u7ed9\u4e86context\u3002<\/p>\n<p>\u5f02\u6b65\u51fd\u6570 start() \u662f\u5165\u53e3\u70b9\u3002\u5728\u542f\u52a8\u670d\u52a1\u5668\u4e4b\u524d\uff0c\u5b83\u4f1a\u521d\u59cb\u5316\u6570\u636e\u5e93\u5e76\u6dfb\u52a0\u6570\u636e\u3002<\/p>\n<h1>\u6267\u884c<\/h1>\n<pre class=\"post-pre\"><code><span class=\"gp\">$<\/span> node server.js\r\n<\/code><\/pre>\n<p>\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d82f4913a08637a6b2176\/33-0.png\" alt=\"image.png\" \/><\/div>\n<p>\u5982\u679c\u6ca1\u6709\u95ee\u9898\u7684\u8bdd\uff0cGraphql\u5e94\u8be5\u53ef\u4ee5\u6309\u7167\u4e0a\u8ff0\u65b9\u5f0f\u6784\u5efa\u3002<\/p>\n<h1>\u6700\u540e<\/h1>\n<p>\u6211\u8ba4\u4e3a\u8fd9\u4ef6\u4e8b\u505a\u5f97\u76f8\u5f53\u7b80\u5355\uff0c\u8fd9\u771f\u662f\u592a\u597d\u4e86\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9996\u5148 \u5c31\u50cf\u6807\u9898\u6240\u8bf4\u7684\u90a3\u6837\uff0c\u6211\u60f3\u5728\u5173\u7cfb\u578b\u6570\u636e\u5e93\uff08MySQL\uff09\u4e2d\u4f7f\u7528GraphQL\uff0c\u5c3d\u7ba1\u6211\u5e73\u65f6\u5e76\u4e0d\u4f7f\u7528\u5b83\uff0c\u4f46\u6211\u8fd8\u662f [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-48085","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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