mongoose 连接警告报错信息处理 { useNewUrlParser: true } 、{ useUnifiedTopology: true }

墨蓝 2024-04-18 20:10 48阅读 0赞

### 整个章节呢，记录一个错误处理 ###

1.、在windows安装好mongodb后，启动没问题，创建数据库没问题；但是在node环境使用`mongoose`之后，有一些警告报信息，附上我的连接代码：

//...
    mongoose.connect('mongodb://127.0.0.1:27017/');
    mongoose.connection.once('open',() => {
        
      console.log('connceted to database.')
    });
    //...

2、然后，控制台输出打印信息：

[nodemon] starting `node server.js`
    (node:35104) DeprecationWarning: current URL string parser is deprecated, and will be removed in a future version. To use the new parser, pass option {
         useNewUrlParser: true } to MongoClient.connect.
    (node:35104) DeprecationWarning: current Server Discovery and Monitoring engine is deprecated, and will be removed in a future version. To use the new Server Discover and Monitoring engine, pass option {
         useUnifiedTopology: true } to the MongoClient constructor.
    start server in port 4000
    connceted to database.

3、这里显示已经连上`mongodb`了，可能是好久没用`mongodb`了，出现了两个警告，所以呢，对于我这种代码强迫症来说，就需要解决这个警告信息，按照提示我们加上对应的参数如下：

mongoose.connect('mongodb://127.0.0.1:27017/', {
         useNewUrlParser: true, useUnifiedTopology: true });
    mongoose.connection.once('open',() => {
        
      console.log('connceted to database.')
    });

4、好吧，接下来继续报错，如下：

throw MongoError.create({
         message: 'database name must be a string', driver: true });
        ^
    
    MongoError: database name must be a string
        at Function.create (E:\web\github-riverscoder\graphQL-examples\node_modules\_mongodb@3.3.2@mongodb\lib\core\error.js:44:12)
        at validateDatabaseName (E:\web\github-riverscoder\graphQL-examples\node_modules\_mongodb@3.3.2@mongodb\lib\operations\db_ops.js:549:22)
        at new Db (E:\web\github-riverscoder\graphQL-examples\node_modules\_mongodb@3.3.2@mongodb\lib\db.js:190:3)
        at MongoClient.db (E:\web\github-riverscoder\graphQL-examples\node_modules\_mongodb@3.3.2@mongodb\lib\mongo_client.js:275:14)
        at E:\web\github-riverscoder\graphQL-examples\node_modules\_mongoose@5.7.0@mongoose\lib\connection.js:637:62
        at result (E:\web\github-riverscoder\graphQL-examples\node_modules\_mongodb@3.3.2@mongodb\lib\operations\execute_operation.js:75:17)
        at executeCallback (E:\web\github-riverscoder\graphQL-examples\node_modules\_mongodb@3.3.2@mongodb\lib\operations\execute_operation.js:68:9)
        at err (E:\web\github-riverscoder\graphQL-examples\node_modules\_mongodb@3.3.2@mongodb\lib\operations\connect.js:193:7)
        at connectCallback (E:\web\github-riverscoder\graphQL-examples\node_modules\_mongodb@3.3.2@mongodb\lib\operations\connect.js:340:5)
        at topology.connect (E:\web\github-riverscoder\graphQL-examples\node_modules\_mongodb@3.3.2@mongodb\lib\operations\connect.js:472:7)
        at Server.connectHandler (E:\web\github-riverscoder\graphQL-examples\node_modules\_mongodb@3.3.2@mongodb\lib\core\sdam\topology.js:259:45)
        at Object.onceWrapper (events.js:286:20)
        at Server.emit (events.js:203:15)
        at Pool.<anonymous> (E:\web\github-riverscoder\graphQL-examples\node_modules\_mongodb@3.3.2@mongodb\lib\core\sdam\server.js:470:12)
        at Pool.emit (events.js:198:13)
        at connect (E:\web\github-riverscoder\graphQL-examples\node_modules\_mongodb@3.3.2@mongodb\lib\core\connection\pool.js:624:10)

5、说数据库名必须是一个字符串，然后仔细检查了下，发现没有带上数据库名，好，接下来，我们带上我们的数据库名称`damiao-test`：

mongoose.connect('mongodb://127.0.0.1:27017/damiao-test', {
         useNewUrlParser: true, useUnifiedTopology: true });
    mongoose.connection.once('open',() => {
        
      console.log('connceted to database.')
    });

6、控制台打印如下：

[nodemon] starting `node server.js`
    start server in port 4000
    connceted to database.

7、好的 ，大功告成 ！！