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Node.js MongoDB 创建数据库


创建数据库

要在 MongoDB 中创建数据库,首先创建 MongoClient 对象,然后指定一个连接 URL,其中包含正确的 IP 地址和要创建的数据库名称。

如果数据库不存在,MongoDB 将创建它,并建立连接。

示例

创建一个名为“mydb”的数据库

var MongoClient = require('mongodb').MongoClient;
var url = "mongodb://127.0.0.1:27017/mydb";

MongoClient.connect(url, function(err, db) {
  if (err) throw err;
  console.log("数据库已创建!");
  db.close();
});
运行示例 »

将以上代码保存到名为“demo_create_mongo_db.js”的文件中,然后运行该文件

运行“demo_create_mongo_db.js”

C:\Users\您的姓名>node demo_create_mongo_db.js

这将为您提供以下结果

数据库已创建!

重要:在 MongoDB 中,数据库只有在获得内容后才会创建!

在您创建了一个集合(表),并且至少包含一个文档(记录)之前,MongoDB 都会等待,然后才会真正创建数据库(以及集合)。


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