代码实现-数据连接

19_Node.js/Koa快速入门.md

@@ -470,4 +470,7 @@ export default router;
    DELETE FROM Users; -- 清空表
    ```
 
-   
+### 4.2 代码实现
+
+> 在Koa框架中可以使用第三方的MySql2插件来实现数据库的相关操作
+

19_Node.js/day-5/code/koa-app/db/index.js

@@ -0,0 +1,19 @@
+import { createPool } from 'mysql2/promise';
+
+const pool = createPool({
+  host: '127.0.0.1',
+  user: 'root',
+  password: 'Jing@123',
+  database: 'shopping',
+  waitForConnections: true,
+  connectionLimit: 10,
+  maxIdle: 10, // max idle connections, the default value is the same as `connectionLimit`
+  idleTimeout: 60000, // idle connections timeout, in milliseconds, the default value 60000
+  queueLimit: 0,
+});
+
+let [res] = await pool.query('select 1 as T;');
+
+console.log(res);
+
+export default pool;

19_Node.js/day-5/code/koa-app/index.js

@@ -0,0 +1,12 @@
+import Koa from 'koa';
+import db from './db/index.js';
+
+const app = new Koa();
+
+app.use(async (ctx) => {
+  ctx.body = 'hh';
+});
+
+app.listen(4000, () => {
+  console.log('Server is running at port:', 4000);
+});

19_Node.js/day-5/code/koa-app/package-lock.json

@@ -0,0 +1,507 @@
+{
+  "name": "koa-app",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "koa-app",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "koa": "^2.14.2",
+        "mysql2": "^3.3.0"
+      }
+    },
+    "node_modules/accepts": {
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+      "dependencies": {
+        "mime-types": "~2.1.34",
+        "negotiator": "0.6.3"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/cache-content-type": {
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+      "dependencies": {
+        "mime-types": "^2.1.18",
+        "ylru": "^1.2.0"
+      },
+      "engines": {
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+      },
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+      }
+    },
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+      "engines": {
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+      }
+    },
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+        "keygrip": "~1.1.0"
+      },
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+        "node": ">= 0.8"
+      }
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+      },
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+      },
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+        }
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+    "node_modules/named-placeholders/node_modules/lru-cache": {
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+      "resolved": "https://registry.npmmirror.com/lru-cache/-/lru-cache-7.18.3.tgz",
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+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/negotiator": {
+      "version": "0.6.3",
+      "resolved": "https://registry.npmmirror.com/negotiator/-/negotiator-0.6.3.tgz",
+      "integrity": "sha512-+EUsqGPLsM+j/zdChZjsnX51g4XrHFOIXwfnCVPGlQk/k5giakcKsuxCObBRu6DSm9opw/O6slWbJdghQM4bBg==",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/on-finished": {
+      "version": "2.4.1",
+      "resolved": "https://registry.npmmirror.com/on-finished/-/on-finished-2.4.1.tgz",
+      "integrity": "sha512-oVlzkg3ENAhCk2zdv7IJwd/QUD4z2RxRwpkcGY8psCVcCYZNq4wYnVWALHM+brtuJjePWiYF/ClmuDr8Ch5+kg==",
+      "dependencies": {
+        "ee-first": "1.1.1"
+      },
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/only": {
+      "version": "0.0.2",
+      "resolved": "https://registry.npmmirror.com/only/-/only-0.0.2.tgz",
+      "integrity": "sha512-Fvw+Jemq5fjjyWz6CpKx6w9s7xxqo3+JCyM0WXWeCSOboZ8ABkyvP8ID4CZuChA/wxSx+XSJmdOm8rGVyJ1hdQ=="
+    },
+    "node_modules/parseurl": {
+      "version": "1.3.3",
+      "resolved": "https://registry.npmmirror.com/parseurl/-/parseurl-1.3.3.tgz",
+      "integrity": "sha512-CiyeOxFT/JZyN5m0z9PfXw4SCBJ6Sygz1Dpl0wqjlhDEGGBP1GnsUVEL0p63hoG1fcj3fHynXi9NYO4nWOL+qQ==",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/safe-buffer": {
+      "version": "5.2.1",
+      "resolved": "https://registry.npmmirror.com/safe-buffer/-/safe-buffer-5.2.1.tgz",
+      "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ=="
+    },
+    "node_modules/safer-buffer": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmmirror.com/safer-buffer/-/safer-buffer-2.1.2.tgz",
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+    },
+    "node_modules/seq-queue": {
+      "version": "0.0.5",
+      "resolved": "https://registry.npmmirror.com/seq-queue/-/seq-queue-0.0.5.tgz",
+      "integrity": "sha512-hr3Wtp/GZIc/6DAGPDcV4/9WoZhjrkXsi5B/07QgX8tsdc6ilr7BFM6PM6rbdAX1kFSDYeZGLipIZZKyQP0O5Q=="
+    },
+    "node_modules/setprototypeof": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmmirror.com/setprototypeof/-/setprototypeof-1.2.0.tgz",
+      "integrity": "sha512-E5LDX7Wrp85Kil5bhZv46j8jOeboKq5JMmYM3gVGdGH8xFpPWXUMsNrlODCrkoxMEeNi/XZIwuRvY4XNwYMJpw=="
+    },
+    "node_modules/sqlstring": {
+      "version": "2.3.3",
+      "resolved": "https://registry.npmmirror.com/sqlstring/-/sqlstring-2.3.3.tgz",
+      "integrity": "sha512-qC9iz2FlN7DQl3+wjwn3802RTyjCx7sDvfQEXchwa6CWOx07/WVfh91gBmQ9fahw8snwGEWU3xGzOt4tFyHLxg==",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/statuses": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmmirror.com/statuses/-/statuses-1.5.0.tgz",
+      "integrity": "sha512-OpZ3zP+jT1PI7I8nemJX4AKmAX070ZkYPVWV/AaKTJl+tXCTGyVdC1a4SL8RUQYEwk/f34ZX8UTykN68FwrqAA==",
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/toidentifier": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmmirror.com/toidentifier/-/toidentifier-1.0.1.tgz",
+      "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA==",
+      "engines": {
+        "node": ">=0.6"
+      }
+    },
+    "node_modules/tsscmp": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmmirror.com/tsscmp/-/tsscmp-1.0.6.tgz",
+      "integrity": "sha512-LxhtAkPDTkVCMQjt2h6eBVY28KCjikZqZfMcC15YBeNjkgUpdCfBu5HoiOTDu86v6smE8yOjyEktJ8hlbANHQA==",
+      "engines": {
+        "node": ">=0.6.x"
+      }
+    },
+    "node_modules/type-is": {
+      "version": "1.6.18",
+      "resolved": "https://registry.npmmirror.com/type-is/-/type-is-1.6.18.tgz",
+      "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
+      "dependencies": {
+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.24"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmmirror.com/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/ylru": {
+      "version": "1.3.2",
+      "resolved": "https://registry.npmmirror.com/ylru/-/ylru-1.3.2.tgz",
+      "integrity": "sha512-RXRJzMiK6U2ye0BlGGZnmpwJDPgakn6aNQ0A7gHRbD4I0uvK4TW6UqkK1V0pp9jskjJBAXd3dRrbzWkqJ+6cxA==",
+      "engines": {
+        "node": ">= 4.0.0"
+      }
+    }
+  }
+}

19_Node.js/day-5/code/koa-app/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "koa-app",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "type": "module",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "dev": "nodemon"
+  },
+  "keywords": [],
+  "author": "daxia",
+  "license": "ISC",
+  "dependencies": {
+    "koa": "^2.14.2",
+    "mysql2": "^3.3.0"
+  }
+}