feat(db): 优化 MongoDB 连接逻辑，移除不必要的代码并添加连接选项

db/mongodbConfig.js

@@ -6,7 +6,6 @@ const account = process.env.MONGO_ACCOUNT
 const password = process.env.MONGO_PASSWORD
 const host = process.env.MONGO_HOST || '122.152.201.90'
 const port = process.env.MONGO_PORT || '27017'
-// const dbName = process.env.MONGO_DB_NAME || 'customer'
 
 let isConnected = false
 
@@ -22,36 +21,29 @@ exports.connectMongoDB = async function () {
   }
 
   try {
-    try {
-      const mongoDBUrl = `mongodb://${account}:${password}@${host}:${port}`
+    const mongoDBUrl = `mongodb://${account}:${password}@${host}:${port}`
 
-      // 连接 MongoDB，不再需要 useNewUrlParser 和 useUnifiedTopology
-      await mongoose.connect(mongoDBUrl)
+    mongoose.connect(mongoDBUrl, {
+      useNewUrlParser: true,
+      useUnifiedTopology: true
+    })
 
-      const db = mongoose.connection
+    mongoose.connection.on('open', () => {
+      console.log('MongoDB 连接成功')
+      isConnected = true
+    })
 
-      db.once('open', () => {
-        console.log('MongoDB 连接成功')
-        isConnected = true
-      })
+    mongoose.connection.on('error', (err) => {
+      console.error('MongoDB 连接错误:', err.message)
+      isConnected = false
+    })
 
-      db.on('error', (err) => {
-        console.error('MongoDB 连接错误:', err.message)
-        isConnected = false
-      })
-
-      db.on('close', () => {
-        console.log('MongoDB 连接关闭')
-        isConnected = false
-      })
-
-      console.log('MongoDB 连接初始化成功')
-    } catch (err) {
-      console.error('MongoDB 连接初始化失败:', err.message)
-      throw err
-    }
+    mongoose.connection.on('close', () => {
+      console.log('MongoDB 连接关闭')
+      isConnected = false
+    })
   } catch (err) {
     console.error('MongoDB 连接初始化失败:', err.message)
-    throw err // 重新抛出错误，以便其他地方可以处理
+    throw err
   }
 }