{"id":950,"date":"2026-07-05T07:35:20","date_gmt":"2026-07-05T07:35:20","guid":{"rendered":"https:\/\/hyc.eshachem.com\/program\/?p=950"},"modified":"2026-07-05T07:35:34","modified_gmt":"2026-07-05T07:35:34","slug":"next-js-%e9%80%a3%e6%8e%a5mysql","status":"publish","type":"post","link":"https:\/\/hyc.eshachem.com\/program\/next-js-%e9%80%a3%e6%8e%a5mysql\/","title":{"rendered":"Next.js &#8211; \u9023\u63a5MySQL"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u5efa\u8b70\u4e86\u89e3\u4ee5\u4e0b\u6587\u7ae0\u5167\u5bb9\u5f8c\u518d\u5f80\u4e0b\u8b80\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/hyc.eshachem.com\/program\/js-callback-hell\/\">https:\/\/hyc.eshachem.com\/program\/js-callback-hell\/<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/hyc.eshachem.com\/program\/js-defensive-function\/\">https:\/\/hyc.eshachem.com\/program\/js-defensive-function\/<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/hyc.eshachem.com\/program\/tcp-keep-alive\/\">https:\/\/hyc.eshachem.com\/program\/tcp-keep-alive\/<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6211\u6700\u8fd1\u90fd\u5728\u7528Next.js\u9032\u884c\u5168\u7aef\u958b\u767c\uff0c\u60f3\u7576\u7136\u723e\u7b2c\u4e00\u500b\u9047\u5230\u7684\u554f\u984c\u5c31\u662f\uff1a\u600e\u9ebc\u63a5DB\uff1f\u56e0\u6b64\u9019\u88cf\u63d0\u4f9b\u89e3\u6cd5\u4e26\u8a73\u7d30\u8aaa\u660e\u6211\u5f8c\u4f86\u7684\u5beb\u6cd5~\uff01<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u9019\u88cf\u5148show\u51fa\u7a0b\u5f0f\u78bc\uff1a<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">import<\/span> mysql <span class=\"hljs-keyword\">from<\/span> <span class=\"hljs-string\">\"mysql2\/promise\"<\/span>;\n\n<span class=\"hljs-keyword\">const<\/span> globalForMysql = globalThis <span class=\"hljs-keyword\">as<\/span> unknown <span class=\"hljs-keyword\">as<\/span> {\n  <span class=\"hljs-attr\">__mysqlPool<\/span>: mysql.Pool | <span class=\"hljs-literal\">undefined<\/span>;\n};\n\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">getRequiredEnv<\/span>(<span class=\"hljs-params\">name: string<\/span>): <span class=\"hljs-title\">string<\/span> <\/span>{\n  <span class=\"hljs-keyword\">const<\/span> value = process.env[name];\n  <span class=\"hljs-keyword\">if<\/span> (!value) {\n    <span class=\"hljs-keyword\">throw<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-built_in\">Error<\/span>(<span class=\"hljs-string\">`Missing required env: <span class=\"hljs-subst\">${name}<\/span>`<\/span>);\n  }\n  <span class=\"hljs-keyword\">return<\/span> value;\n}\n\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">createNewPool<\/span>(<span class=\"hljs-params\"><\/span>) <\/span>{\n  <span class=\"hljs-keyword\">return<\/span> mysql.createPool({\n    <span class=\"hljs-attr\">host<\/span>: getRequiredEnv(<span class=\"hljs-string\">\"DB_HOST\"<\/span>),\n    <span class=\"hljs-attr\">port<\/span>: <span class=\"hljs-built_in\">Number<\/span>(process.env.DB_PORT || <span class=\"hljs-number\">3306<\/span>),\n    <span class=\"hljs-attr\">user<\/span>: getRequiredEnv(<span class=\"hljs-string\">\"DB_USER\"<\/span>),\n    <span class=\"hljs-attr\">password<\/span>: getRequiredEnv(<span class=\"hljs-string\">\"DB_PASSWORD\"<\/span>),\n    <span class=\"hljs-attr\">database<\/span>: getRequiredEnv(<span class=\"hljs-string\">\"DB_NAME\"<\/span>),\n    <span class=\"hljs-attr\">waitForConnections<\/span>: <span class=\"hljs-literal\">true<\/span>,\n    <span class=\"hljs-attr\">connectionLimit<\/span>: <span class=\"hljs-number\">5<\/span>,\n    <span class=\"hljs-attr\">queueLimit<\/span>: <span class=\"hljs-number\">0<\/span>,\n    <span class=\"hljs-attr\">enableKeepAlive<\/span>: <span class=\"hljs-literal\">true<\/span>,\n    <span class=\"hljs-attr\">keepAliveInitialDelay<\/span>: <span class=\"hljs-number\">10000<\/span>,\n  });\n}\n\n<span class=\"hljs-keyword\">export<\/span> <span class=\"hljs-keyword\">const<\/span> pool =\n  process.env.NODE_ENV !== <span class=\"hljs-string\">\"production\"<\/span>\n    ? globalForMysql.__mysqlPool || (globalForMysql.__mysqlPool = createNewPool())\n    : createNewPool();<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\" id=\"%e5%9f%ba%e7%a4%8e%e8%a8%ad%e5%ae%9a\">\u57fa\u790e\u8a2d\u5b9a<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u63a5\u7740\u518d\u4f86\u9010\u884c\u89e3\u91cb\u5982\u4e0b\uff1a<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">import<\/span> mysql <span class=\"hljs-keyword\">from<\/span> <span class=\"hljs-string\">\"mysql2\/promise\"<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<ul class=\"wp-block-list\">\n<li>\u7528\u7684\u662f <code>mysql2<\/code> \u5957\u4ef6\u7684 <strong>Promise \u7248\u672c<\/strong>\u3002<\/li>\n\n\n\n<li>\u50b3\u7d71\u7684 <code>mysql2<\/code> \u662f\u4f7f\u7528\u300c\u56de\u547c\u51fd\u5f0f (Callback)\u300d\uff0c\u5beb\u4e45\u4e86\u6703\u8b8a\u6210 Callback Hell\u3002\u5f15\u5165 <code>promise<\/code> \u7248\u672c\u5f8c\uff0c\u6211\u5011\u5c31\u53ef\u4ee5\u5728 Route Handler \u4e2d\u512a\u96c5\u5730\u4f7f\u7528 <code>async\/await<\/code> \u4f86\u8655\u7406\u975e\u540c\u6b65\u7684\u8cc7\u6599\u5eab\u64cd\u4f5c\u3002<\/li>\n<\/ul>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">\n<span class=\"hljs-keyword\">const<\/span> globalForMysql = globalThis <span class=\"hljs-keyword\">as<\/span> unknown <span class=\"hljs-keyword\">as<\/span> {\n  <span class=\"hljs-attr\">__mysqlPool<\/span>: mysql.Pool | <span class=\"hljs-literal\">undefined<\/span>;\n};<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>globalThis<\/code><\/strong> \u662f\u4e00\u500b  JavaScript \u5167\u5efa\u7684\u5168\u57df\u7269\u4ef6\uff08\u5728 Node.js \u74b0\u5883\u6307\u7684\u5c31\u662f <code>global<\/code>\uff0c\u5728\u700f\u89bd\u5668\u6307\u7684\u5c31\u662f <code>window<\/code>\uff09\u3002<\/li>\n\n\n\n<li><strong><code>as unknown as { __mysqlPool: ... }<\/code><\/strong> \u4f7f\u7528\u300c\u96d9\u91cd\u578b\u5225\u65b7\u8a00\uff08Type Assertion\uff09\u300d\uff08 \u5148\u8f49\u6210\u6700\u5bec\u9b06\u7684 <code>unknown<\/code>\uff0c\u518d\u5f37\u5236\u8f49\u578b\u6210\u300c\u542b\u6709 <code>__mysqlPool<\/code> \u5c6c\u6027\uff08\u5176\u578b\u5225\u53ef\u80fd\u662f <code>mysql.Pool<\/code> \u6216 <code>undefined<\/code>\uff09\u7684\u7269\u4ef6\u300d\uff0c\u597d\u8b93 TypeScript \u9589\u5634\uff09\u56e0\u70ba JavaScript \u7684 <code>globalThis<\/code> \u9810\u8a2d\u4e26\u6c92\u6709 <code>__mysqlPool<\/code> \u9019\u500b\u5c6c\u6027\uff0c\u5982\u679c\u4f60\u76f4\u63a5\u5beb <code>globalThis.__mysqlPool<\/code>\uff0cTypeScript \u6703\u5674\u932f\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\">\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">getRequiredEnv<\/span>(<span class=\"hljs-params\">name: string<\/span>): <span class=\"hljs-title\">string<\/span> <\/span>{\n  <span class=\"hljs-keyword\">const<\/span> value = process.env[name];\n  <span class=\"hljs-keyword\">if<\/span> (!value) {\n    <span class=\"hljs-keyword\">throw<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-built_in\">Error<\/span>(<span class=\"hljs-string\">`Missing required env: <span class=\"hljs-subst\">${name}<\/span>`<\/span>);\n  }\n  <span class=\"hljs-keyword\">return<\/span> value;\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p class=\"wp-block-paragraph\">\u5b9a\u7fa9\u4e00\u500b\u540d\u70ba <code>getRequiredEnv<\/code> \u7684\u9632\u79a6\u578b\u51fd\u5f0f\uff0c\u63a5\u6536\u4e00\u500b\u5b57\u4e32\u53c3\u6578 <code>name<\/code>\uff08\u74b0\u5883\u8b8a\u6578\u7684\u540d\u7a31\uff09\uff0c\u4e26\u4fdd\u8b49\u56de\u50b3\u7684\u4e00\u5b9a\u662f\u5b57\u4e32<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\">\n\n\n\n<h2 class=\"wp-block-heading\" id=\"%e5%bb%ba%e7%ab%8b%e9%80%a3%e7%b7%9a%e6%b1%a0%ef%bc%88connection-pool%ef%bc%89\">\u5efa\u7acb\u9023\u7dda\u6c60\uff08Connection Pool\uff09<\/h2>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">\n<span class=\"hljs-function\"><span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title\">createNewPool<\/span>(<span class=\"hljs-params\"><\/span>) <\/span>{\n  <span class=\"hljs-keyword\">return<\/span> mysql.createPool({\n    <span class=\"hljs-attr\">host<\/span>: getRequiredEnv(<span class=\"hljs-string\">\"DB_HOST\"<\/span>),\n    <span class=\"hljs-attr\">port<\/span>: <span class=\"hljs-built_in\">Number<\/span>(process.env.DB_PORT || <span class=\"hljs-number\">3306<\/span>),\n    <span class=\"hljs-attr\">user<\/span>: getRequiredEnv(<span class=\"hljs-string\">\"DB_USER\"<\/span>),\n    <span class=\"hljs-attr\">password<\/span>: getRequiredEnv(<span class=\"hljs-string\">\"DB_PASSWORD\"<\/span>),\n    <span class=\"hljs-attr\">database<\/span>: getRequiredEnv(<span class=\"hljs-string\">\"DB_NAME\"<\/span>),\n    <span class=\"hljs-attr\">waitForConnections<\/span>: <span class=\"hljs-literal\">true<\/span>,\n    <span class=\"hljs-attr\">connectionLimit<\/span>: <span class=\"hljs-number\">5<\/span>, <span class=\"hljs-comment\">\/\/\u8a2d\u5b9a\u9023\u7dda\u6700\u591a\u6578\u91cf<\/span>\n    <span class=\"hljs-attr\">queueLimit<\/span>: <span class=\"hljs-number\">0<\/span>,\n    <span class=\"hljs-attr\">enableKeepAlive<\/span>: <span class=\"hljs-literal\">true<\/span>,\n    <span class=\"hljs-attr\">keepAliveInitialDelay<\/span>: <span class=\"hljs-number\">10000<\/span>,\n  });\n}<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>\u5efa\u7acb\u300c\u9023\u7dda\u6c60\uff08Pool\uff09\u300d\uff0c\u800c\u975e\u300c\u55ae\u4e00\u9023\u7dda\uff08Connection\uff09\u300d\u3002<\/strong> <\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">\u9023\u7dda\u6c60\u6703\u5e6b\u4f60\u7ba1\u7406\u591a\u500b\u9023\u7dda\uff0c\u91cd\u8907\u5229\u7528\uff0c\u4e0d\u6703\u6bcf\u6b21\u67e5\u8a62\u90fd\u91cd\u65b0\u958b\u95dc TCP \u9023\u7dda\uff08\u4e09\u5411\u4ea4\u63e1\uff09\uff0c\u6548\u80fd\u597d\u5f88\u591a\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>waitForConnections: true<\/code><\/strong>\uff1a\u7576\u9023\u7dda\u6c60\u88e1\u7684 5 \u500b\u9023\u7dda\u90fd\u88ab\u62ff\u5149\u4e86\uff0c\u4e0b\u4e00\u500b\u8acb\u6c42\u9032\u4f86\u6642\uff0c\u8981\u300c\u6392\u968a\u7b49\u5f85\u300d\u6709\u4eba\u91cb\u653e\u9023\u7dda\uff0c\u800c\u4e0d\u662f\u76f4\u63a5\u5831\u932f\u62d2\u7d55\u3002<\/li>\n\n\n\n<li><strong><code>queueLimit: 0<\/code><\/strong>\uff1a\u7576\u9023\u7dda\u6eff\u4e86\uff0c\u6392\u968a\u7b49\u5f85\u7684\u8acb\u6c42\u6578\u91cf\u300c\u6c92\u6709\u4e0a\u9650\u300d\uff08<code>0<\/code> \u4ee3\u8868\u4e0d\u9650\u5236\uff09\u3002<\/li>\n\n\n\n<li><strong><code>enableKeepAlive: true<\/code><\/strong> \u8207 <strong><code>keepAliveInitialDelay: 10000<\/code><\/strong>\uff1a<\/li>\n\n\n\n<li>\u9019\u662f\u70ba\u4e86\u89e3\u6c7a <strong>Serverless \u74b0\u5883<\/strong> \u6216 <strong>\u9632\u706b\u7246<\/strong> \u7684\u9592\u7f6e\u65b7\u7dda\u554f\u984c\u3002\u6bcf\u9694 10000 \u6beb\u79d2\uff0810 \u79d2\uff09\uff0c\u9023\u7dda\u6c60\u6703\u81ea\u52d5\u5411 MySQL \u767c\u9001\u4e00\u500b\u300c\u5fc3\u8df3\u5305\uff08TCP Keep-Alive\uff09\u300d\uff0c\u544a\u8a34\u8cc7\u6599\u5eab\u300c\u6211\u9084\u6d3b\u8457\uff0c\u5225\u628a\u6211\u65b7\u7dda\u300d\uff0c\u907f\u514d\u767c\u751f <code>ETIMEDOUT<\/code> \u6216 <code>PROTOCOL_CONNECTION_LOST<\/code> \u7684\u932f\u8aa4\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\">\n\n\n\n<h2 class=\"wp-block-heading\" id=\"%e5%96%ae%e4%be%8b%e6%a8%a1%e5%bc%8f%e8%88%87%e7%92%b0%e5%a2%83%e5%88%86%e6%b5%81\">\u55ae\u4f8b\u6a21\u5f0f\u8207\u74b0\u5883\u5206\u6d41<\/h2>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\"><span class=\"hljs-keyword\">export<\/span> <span class=\"hljs-keyword\">const<\/span> pool =\n  process.env.NODE_ENV !== <span class=\"hljs-string\">\"production\"<\/span>\n    ? globalForMysql.__mysqlPool || (globalForMysql.__mysqlPool = createNewPool())\n    : createNewPool();<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p class=\"wp-block-paragraph\">\u6aa2\u67e5\u5982\u679c\u4e0d\u662f<strong>\u975e\u751f\u7522\u74b0\u5883<\/strong>\uff08\u4e5f\u5c31\u662f <code>development<\/code> \u958b\u767c\u74b0\u5883\u6216 <code>test<\/code> \u6e2c\u8a66\u74b0\u5883\uff09\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5efa\u8b70\u4e86\u89e3\u4ee5\u4e0b\u6587\u7ae0\u5167\u5bb9\u5f8c\u518d\u5f80\u4e0b\u8b80\uff1a https:\/\/hyc.eshachem.com\/program\/js-callback-hell\/ https:\/\/hyc.eshachem.com\/program\/js-defensive-function\/ https:\/\/hyc.eshachem.com\/program\/tcp-keep-alive\/ \u6211\u6700\u8fd1\u90fd\u5728\u7528Next.js\u9032\u884c\u5168\u7aef\u958b\u767c\uff0c\u60f3\u7576\u7136\u723e\u7b2c\u4e00\u500b\u9047\u5230\u7684\u554f\u984c\u5c31\u662f\uff1a\u600e\u9ebc\u63a5DB\uff1f\u56e0\u6b64\u9019\u88cf\u63d0\u4f9b\u89e3\u6cd5\u4e26\u8a73\u7d30\u8aaa\u660e\u6211\u5f8c\u4f86\u7684\u5beb\u6cd5~\uff01 \u9019\u88cf\u5148show\u51fa\u7a0b\u5f0f\u78bc\uff1a \u57fa\u790e\u8a2d\u5b9a \u63a5\u7740\u518d\u4f86\u9010\u884c\u89e3\u91cb\u5982\u4e0b\uff1a \u5b9a\u7fa9\u4e00\u500b\u540d\u70ba getRequiredEnv \u7684\u9632\u79a6\u578b\u51fd\u5f0f\uff0c\u63a5\u6536\u4e00\u500b\u5b57\u4e32\u53c3\u6578 name\uff08\u74b0\u5883\u8b8a\u6578\u7684\u540d\u7a31\uff09\uff0c\u4e26\u4fdd\u8b49\u56de\u50b3\u7684\u4e00\u5b9a\u662f\u5b57\u4e32 \u5efa\u7acb\u9023\u7dda\u6c60\uff08Connection Pool\uff09 \u5efa\u7acb\u300c\u9023\u7dda\u6c60\uff08Pool\uff09\u300d\uff0c\u800c\u975e\u300c\u55ae\u4e00\u9023\u7dda\uff08Connection\uff09\u300d\u3002 \u9023\u7dda\u6c60\u6703\u5e6b\u4f60\u7ba1\u7406\u591a\u500b\u9023\u7dda\uff0c\u91cd\u8907\u5229\u7528\uff0c\u4e0d\u6703\u6bcf\u6b21\u67e5\u8a62\u90fd\u91cd\u65b0\u958b\u95dc TCP \u9023\u7dda\uff08\u4e09\u5411\u4ea4\u63e1\uff09\uff0c\u6548\u80fd\u597d\u5f88\u591a\u3002 \u55ae\u4f8b\u6a21\u5f0f\u8207\u74b0\u5883\u5206\u6d41 \u6aa2\u67e5\u5982\u679c\u4e0d\u662f\u975e\u751f\u7522\u74b0\u5883\uff08\u4e5f\u5c31\u662f development \u958b\u767c\u74b0\u5883\u6216 test \u6e2c\u8a66\u74b0\u5883\uff09\u3002<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[15],"tags":[],"class_list":["post-950","post","type-post","status-publish","format-standard","hentry","category-front-end"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u5efa\u8b70\u4e86\u89e3\u4ee5\u4e0b\u6587\u7ae0\u5167\u5bb9\u5f8c\u518d\u5f80\u4e0b\u8b80\uff1a https:\/\/hyc.eshachem.com\/program\/js-callback-hell\/ https:\/\/hyc.eshachem.com\/program\/js-defensive-function\/ https:\/\/hyc.eshachem.com\/program\/tcp-keep-alive\/ \u6211\u6700\u8fd1\u90fd\u5728\u7528Next.js\u9032\u884c\u5168\u7aef\u958b\u767c\uff0c\u60f3\u7576\u7136\u723e\u7b2c\u4e00\u500b\u9047\u5230\u7684\u554f\u984c\u5c31\u662f\uff1a\u600e\u9ebc\u63a5DB\uff1f\u56e0\u6b64\u9019\u88cf\u63d0\u4f9b\u89e3\u6cd5\u4e26\u8a73\u7d30\u8aaa\u660e\u6211\u5f8c\u4f86\u7684\u5beb\u6cd5~\uff01 \u9019\u88cf\u5148show\u51fa\u7a0b\u5f0f\u78bc\uff1a import mysql from &quot;mysql2\/promise&quot;; const globalForMysql = globalThis as unknown as { __mysqlPool: mysql.Pool | undefined; }; function getRequiredEnv(name: string): string { const value = process.env[name]; if (!value) { throw new Error(`Missing required env: ${name}`); } return value; } function createNewPool() { return mysql.createPool({ host: getRequiredEnv(&quot;DB_HOST&quot;), port: Number(process.env.DB_PORT ||\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"H.Y. 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Chen\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/hyc.eshachem.com\\\/program\\\/next-js-%e9%80%a3%e6%8e%a5mysql\\\/#webpage\",\"url\":\"https:\\\/\\\/hyc.eshachem.com\\\/program\\\/next-js-%e9%80%a3%e6%8e%a5mysql\\\/\",\"name\":\"Next.js \\u2013 \\u9023\\u63a5MySQL - HyC Wiki\",\"description\":\"\\u5efa\\u8b70\\u4e86\\u89e3\\u4ee5\\u4e0b\\u6587\\u7ae0\\u5167\\u5bb9\\u5f8c\\u518d\\u5f80\\u4e0b\\u8b80\\uff1a https:\\\/\\\/hyc.eshachem.com\\\/program\\\/js-callback-hell\\\/ https:\\\/\\\/hyc.eshachem.com\\\/program\\\/js-defensive-function\\\/ https:\\\/\\\/hyc.eshachem.com\\\/program\\\/tcp-keep-alive\\\/ \\u6211\\u6700\\u8fd1\\u90fd\\u5728\\u7528Next.js\\u9032\\u884c\\u5168\\u7aef\\u958b\\u767c\\uff0c\\u60f3\\u7576\\u7136\\u723e\\u7b2c\\u4e00\\u500b\\u9047\\u5230\\u7684\\u554f\\u984c\\u5c31\\u662f\\uff1a\\u600e\\u9ebc\\u63a5DB\\uff1f\\u56e0\\u6b64\\u9019\\u88cf\\u63d0\\u4f9b\\u89e3\\u6cd5\\u4e26\\u8a73\\u7d30\\u8aaa\\u660e\\u6211\\u5f8c\\u4f86\\u7684\\u5beb\\u6cd5~\\uff01 \\u9019\\u88cf\\u5148show\\u51fa\\u7a0b\\u5f0f\\u78bc\\uff1a import mysql from \\\"mysql2\\\/promise\\\"; const globalForMysql = globalThis as unknown as { __mysqlPool: mysql.Pool | undefined; }; function getRequiredEnv(name: string): string { const value = process.env[name]; if (!value) { throw new Error(`Missing required env: ${name}`); } return value; } function createNewPool() { return mysql.createPool({ host: getRequiredEnv(\\\"DB_HOST\\\"), port: Number(process.env.DB_PORT ||\",\"inLanguage\":\"en-US\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/hyc.eshachem.com\\\/program\\\/#website\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/hyc.eshachem.com\\\/program\\\/next-js-%e9%80%a3%e6%8e%a5mysql\\\/#breadcrumblist\"},\"author\":{\"@id\":\"https:\\\/\\\/hyc.eshachem.com\\\/program\\\/author\\\/hychen\\\/#author\"},\"creator\":{\"@id\":\"https:\\\/\\\/hyc.eshachem.com\\\/program\\\/author\\\/hychen\\\/#author\"},\"datePublished\":\"2026-07-05T07:35:20+00:00\",\"dateModified\":\"2026-07-05T07:35:34+00:00\"},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/hyc.eshachem.com\\\/program\\\/#website\",\"url\":\"https:\\\/\\\/hyc.eshachem.com\\\/program\\\/\",\"name\":\"HyC Wiki\",\"description\":\"Technical articles\",\"inLanguage\":\"en-US\",\"publisher\":{\"@id\":\"https:\\\/\\\/hyc.eshachem.com\\\/program\\\/#person\"}}]}\n\t\t<\/script>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"Next.js \u2013 \u9023\u63a5MySQL - HyC Wiki","description":"\u5efa\u8b70\u4e86\u89e3\u4ee5\u4e0b\u6587\u7ae0\u5167\u5bb9\u5f8c\u518d\u5f80\u4e0b\u8b80\uff1a https:\/\/hyc.eshachem.com\/program\/js-callback-hell\/ https:\/\/hyc.eshachem.com\/program\/js-defensive-function\/ https:\/\/hyc.eshachem.com\/program\/tcp-keep-alive\/ \u6211\u6700\u8fd1\u90fd\u5728\u7528Next.js\u9032\u884c\u5168\u7aef\u958b\u767c\uff0c\u60f3\u7576\u7136\u723e\u7b2c\u4e00\u500b\u9047\u5230\u7684\u554f\u984c\u5c31\u662f\uff1a\u600e\u9ebc\u63a5DB\uff1f\u56e0\u6b64\u9019\u88cf\u63d0\u4f9b\u89e3\u6cd5\u4e26\u8a73\u7d30\u8aaa\u660e\u6211\u5f8c\u4f86\u7684\u5beb\u6cd5~\uff01 \u9019\u88cf\u5148show\u51fa\u7a0b\u5f0f\u78bc\uff1a import mysql from \"mysql2\/promise\"; const globalForMysql = globalThis as unknown as { __mysqlPool: mysql.Pool | undefined; }; function getRequiredEnv(name: string): string { const value = process.env[name]; if (!value) { throw new Error(`Missing required env: ${name}`); } return value; } function createNewPool() { return mysql.createPool({ host: getRequiredEnv(\"DB_HOST\"), port: Number(process.env.DB_PORT ||","canonical_url":"https:\/\/hyc.eshachem.com\/program\/next-js-%e9%80%a3%e6%8e%a5mysql\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"google-site-verification":"-324YR5tomynX5FeTW2lTMHIX0KmPBvpxjXpOhXwi1Q","miscellaneous":""},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"BlogPosting","@id":"https:\/\/hyc.eshachem.com\/program\/next-js-%e9%80%a3%e6%8e%a5mysql\/#blogposting","name":"Next.js \u2013 \u9023\u63a5MySQL - HyC Wiki","headline":"Next.js &#8211; \u9023\u63a5MySQL","author":{"@id":"https:\/\/hyc.eshachem.com\/program\/author\/hychen\/#author"},"publisher":{"@id":"https:\/\/hyc.eshachem.com\/program\/#person"},"image":{"@type":"ImageObject","@id":"https:\/\/hyc.eshachem.com\/program\/next-js-%e9%80%a3%e6%8e%a5mysql\/#articleImage","url":"https:\/\/secure.gravatar.com\/avatar\/fc6e05e080c9ea570267ee9ed68c8b1841d745cee07c0331c5440646e0646603?s=96&d=mm&r=g","width":96,"height":96,"caption":"H.Y. 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Chen","image":{"@type":"ImageObject","@id":"https:\/\/hyc.eshachem.com\/program\/next-js-%e9%80%a3%e6%8e%a5mysql\/#personImage","url":"https:\/\/secure.gravatar.com\/avatar\/fc6e05e080c9ea570267ee9ed68c8b1841d745cee07c0331c5440646e0646603?s=96&d=mm&r=g","width":96,"height":96,"caption":"H.Y. Chen"}},{"@type":"Person","@id":"https:\/\/hyc.eshachem.com\/program\/author\/hychen\/#author","url":"https:\/\/hyc.eshachem.com\/program\/author\/hychen\/","name":"H.Y. Chen","image":{"@type":"ImageObject","@id":"https:\/\/hyc.eshachem.com\/program\/next-js-%e9%80%a3%e6%8e%a5mysql\/#authorImage","url":"https:\/\/secure.gravatar.com\/avatar\/fc6e05e080c9ea570267ee9ed68c8b1841d745cee07c0331c5440646e0646603?s=96&d=mm&r=g","width":96,"height":96,"caption":"H.Y. Chen"}},{"@type":"WebPage","@id":"https:\/\/hyc.eshachem.com\/program\/next-js-%e9%80%a3%e6%8e%a5mysql\/#webpage","url":"https:\/\/hyc.eshachem.com\/program\/next-js-%e9%80%a3%e6%8e%a5mysql\/","name":"Next.js \u2013 \u9023\u63a5MySQL - HyC Wiki","description":"\u5efa\u8b70\u4e86\u89e3\u4ee5\u4e0b\u6587\u7ae0\u5167\u5bb9\u5f8c\u518d\u5f80\u4e0b\u8b80\uff1a https:\/\/hyc.eshachem.com\/program\/js-callback-hell\/ https:\/\/hyc.eshachem.com\/program\/js-defensive-function\/ https:\/\/hyc.eshachem.com\/program\/tcp-keep-alive\/ \u6211\u6700\u8fd1\u90fd\u5728\u7528Next.js\u9032\u884c\u5168\u7aef\u958b\u767c\uff0c\u60f3\u7576\u7136\u723e\u7b2c\u4e00\u500b\u9047\u5230\u7684\u554f\u984c\u5c31\u662f\uff1a\u600e\u9ebc\u63a5DB\uff1f\u56e0\u6b64\u9019\u88cf\u63d0\u4f9b\u89e3\u6cd5\u4e26\u8a73\u7d30\u8aaa\u660e\u6211\u5f8c\u4f86\u7684\u5beb\u6cd5~\uff01 \u9019\u88cf\u5148show\u51fa\u7a0b\u5f0f\u78bc\uff1a import mysql from \"mysql2\/promise\"; const globalForMysql = globalThis as unknown as { __mysqlPool: mysql.Pool | undefined; }; function getRequiredEnv(name: string): string { const value = process.env[name]; if (!value) { throw new Error(`Missing required env: ${name}`); } return value; } function createNewPool() { return mysql.createPool({ host: getRequiredEnv(\"DB_HOST\"), port: Number(process.env.DB_PORT ||","inLanguage":"en-US","isPartOf":{"@id":"https:\/\/hyc.eshachem.com\/program\/#website"},"breadcrumb":{"@id":"https:\/\/hyc.eshachem.com\/program\/next-js-%e9%80%a3%e6%8e%a5mysql\/#breadcrumblist"},"author":{"@id":"https:\/\/hyc.eshachem.com\/program\/author\/hychen\/#author"},"creator":{"@id":"https:\/\/hyc.eshachem.com\/program\/author\/hychen\/#author"},"datePublished":"2026-07-05T07:35:20+00:00","dateModified":"2026-07-05T07:35:34+00:00"},{"@type":"WebSite","@id":"https:\/\/hyc.eshachem.com\/program\/#website","url":"https:\/\/hyc.eshachem.com\/program\/","name":"HyC Wiki","description":"Technical articles","inLanguage":"en-US","publisher":{"@id":"https:\/\/hyc.eshachem.com\/program\/#person"}}]},"og:locale":"en_US","og:site_name":"HyC Wiki - Technical articles","og:type":"article","og:title":"Next.js \u2013 \u9023\u63a5MySQL - HyC Wiki","og:description":"\u5efa\u8b70\u4e86\u89e3\u4ee5\u4e0b\u6587\u7ae0\u5167\u5bb9\u5f8c\u518d\u5f80\u4e0b\u8b80\uff1a https:\/\/hyc.eshachem.com\/program\/js-callback-hell\/ https:\/\/hyc.eshachem.com\/program\/js-defensive-function\/ https:\/\/hyc.eshachem.com\/program\/tcp-keep-alive\/ \u6211\u6700\u8fd1\u90fd\u5728\u7528Next.js\u9032\u884c\u5168\u7aef\u958b\u767c\uff0c\u60f3\u7576\u7136\u723e\u7b2c\u4e00\u500b\u9047\u5230\u7684\u554f\u984c\u5c31\u662f\uff1a\u600e\u9ebc\u63a5DB\uff1f\u56e0\u6b64\u9019\u88cf\u63d0\u4f9b\u89e3\u6cd5\u4e26\u8a73\u7d30\u8aaa\u660e\u6211\u5f8c\u4f86\u7684\u5beb\u6cd5~\uff01 \u9019\u88cf\u5148show\u51fa\u7a0b\u5f0f\u78bc\uff1a import mysql from &quot;mysql2\/promise&quot;; const globalForMysql = globalThis as unknown as { __mysqlPool: mysql.Pool | undefined; }; function getRequiredEnv(name: string): string { const value = process.env[name]; if (!value) { throw new Error(`Missing required env: ${name}`); } return value; } function createNewPool() { return mysql.createPool({ host: getRequiredEnv(&quot;DB_HOST&quot;), port: Number(process.env.DB_PORT ||","og:url":"https:\/\/hyc.eshachem.com\/program\/next-js-%e9%80%a3%e6%8e%a5mysql\/","og:image":"https:\/\/hyc.eshachem.com\/program\/wp-content\/uploads\/2026\/06\/cropped-cropped-\u672a\u547d\u540d\u8a2d\u8a08-4.png","og:image:secure_url":"https:\/\/hyc.eshachem.com\/program\/wp-content\/uploads\/2026\/06\/cropped-cropped-\u672a\u547d\u540d\u8a2d\u8a08-4.png","og:image:width":64,"og:image:height":64,"article:published_time":"2026-07-05T07:35:20+00:00","article:modified_time":"2026-07-05T07:35:34+00:00","twitter:card":"summary_large_image","twitter:title":"Next.js \u2013 \u9023\u63a5MySQL - HyC Wiki","twitter:description":"\u5efa\u8b70\u4e86\u89e3\u4ee5\u4e0b\u6587\u7ae0\u5167\u5bb9\u5f8c\u518d\u5f80\u4e0b\u8b80\uff1a https:\/\/hyc.eshachem.com\/program\/js-callback-hell\/ https:\/\/hyc.eshachem.com\/program\/js-defensive-function\/ https:\/\/hyc.eshachem.com\/program\/tcp-keep-alive\/ \u6211\u6700\u8fd1\u90fd\u5728\u7528Next.js\u9032\u884c\u5168\u7aef\u958b\u767c\uff0c\u60f3\u7576\u7136\u723e\u7b2c\u4e00\u500b\u9047\u5230\u7684\u554f\u984c\u5c31\u662f\uff1a\u600e\u9ebc\u63a5DB\uff1f\u56e0\u6b64\u9019\u88cf\u63d0\u4f9b\u89e3\u6cd5\u4e26\u8a73\u7d30\u8aaa\u660e\u6211\u5f8c\u4f86\u7684\u5beb\u6cd5~\uff01 \u9019\u88cf\u5148show\u51fa\u7a0b\u5f0f\u78bc\uff1a import mysql from &quot;mysql2\/promise&quot;; const globalForMysql = globalThis as unknown as { __mysqlPool: mysql.Pool | undefined; }; function getRequiredEnv(name: string): string { const value = process.env[name]; if (!value) { throw new Error(`Missing required env: ${name}`); } return value; } function createNewPool() { return mysql.createPool({ host: getRequiredEnv(&quot;DB_HOST&quot;), port: Number(process.env.DB_PORT ||","twitter:image":"https:\/\/hyc.eshachem.com\/program\/wp-content\/uploads\/2026\/06\/cropped-cropped-\u672a\u547d\u540d\u8a2d\u8a08-4.png"},"aioseo_meta_data":{"post_id":"950","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_custom_url":null,"og_image_custom_fields":null,"og_image_url":null,"og_image_width":null,"og_image_height":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_image_url":null,"twitter_title":null,"twitter_description":null,"schema_type":"default","schema_type_options":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"limit_modified_date":false,"ai":null,"breadcrumb_settings":null,"seo_analyzer_scan_date":null,"created":"2026-07-28 14:33:05","updated":"2026-07-28 14:33:05"},"aioseo_breadcrumb":"<div class=\"aioseo-breadcrumbs\"><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/hyc.eshachem.com\/program\" title=\"Home\">Home<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/hyc.eshachem.com\/program\/category\/front-end\/\" title=\"Front-End\">Front-End<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tNext.js \u2013 \u9023\u63a5MySQL\n\t\t<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/hyc.eshachem.com\/program"},{"label":"Front-End","link":"https:\/\/hyc.eshachem.com\/program\/category\/front-end\/"},{"label":"Next.js &#8211; 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