后端链接数据库

server/app/controller/home.js

@@ -0,0 +1,9 @@
+const Controller = require('egg').Controller;
+
+class HomeController extends Controller {
+  async index() {
+    this.ctx.body = 'Hello world';
+  }
+}
+
+module.exports = HomeController;

server/app/router.js

@@ -0,0 +1,4 @@
+module.exports = (app) => {
+  const { router, controller } = app;
+  router.get('/', controller.home.index);
+};

server/app/service/db.js

@@ -0,0 +1,31 @@
+const Service = require("egg").Service
+
+class DbService extends Service {
+  async addOrUpdate(table, form) {
+    let result
+    if (!form.id) {//创建
+      result = await this.app.mysql.insert(table, form)
+    } else {//更新
+      result = await this.app.mysql.update(table, form)
+    }
+    return result === 1
+  }
+
+  async delete(table, id) {
+    await this.app.mysql.delete(table, {id})
+  }
+
+  async detail(table, id) {
+    return await this.app.mysql.get(table, {id})
+  }
+
+  async list(table, params = {}) {
+    return await this.app.mysql.select(table, {
+      where: params,
+      limit: params?.size || 10, // 返回数据量
+      offset: Math.max(params?.current - 1, 0), // 数据偏移量
+    })
+  }
+}
+
+module.exports = DbService