英文字典中文字典


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       







请输入英文单字，中文词皆可：


请选择你想看的字典辞典：
单词字典翻译
_id查看　_id　在百度字典中的解释百度英翻中〔查看〕
_id查看　_id　在Google字典中的解释Google英翻中〔查看〕
_id查看　_id　在Yahoo字典中的解释Yahoo英翻中〔查看〕

安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:


  • Difference between id and _id fields in MongoDB
    The _id field MongoDB assigns an _id field to each document and assigns primary index on it There're ways by which we can apply secondary indices as well By default, MongoDB creates values for the _id field of type ObjectID This value is defined in BSON spec and it's structured this way:
  • MongoDB：MongoDB中”id”和”_id”字段的区别|极客教程
    “_id”字段是由MongoDB自动生成的标识符，使用了ObjectId数据类型，具有全局唯一性和高度随机性。 唯一性要求： “id”字段可以是任何字段，它不需要保证在集合中是唯一的。 “_id”字段在每个文档中必须是唯一的，并且MongoDB会对其进行验证和强制执行唯一性。
  • Documents - Database Manual - MongoDB Docs
    In MongoDB, each document stored in a standard collection requires a unique _id field that acts as a primary key If an inserted document omits the _id field, the MongoDB driver automatically generates an ObjectId for the _id field This also applies to documents inserted through update operations with upsert: true
  • What Is MongoDB’s _id Field and How to Use It - SolarWinds
    _id is the primary key on elements in a collection; with it, records can be differentiated by default _id is automatically indexed Lookups specifying { _id: <someval> } refer to the _id index as their guide
  • How is id Generated in MongoDB - GeeksforGeeks
    In MongoDB, each document stored in a collection is uniquely identified by a field called _id This _id field serves as the primary key for the document and is important for ensuring document uniqueness and efficient retrieval But have you ever wondered how these _id values are generated in MongoDB?
  • MongoDB: How to set your own _id field value (with examples)
    By default, MongoDB generates a unique ObjectId for each document, but it also allows users to set custom _id values This tutorial provides a comprehensive guide on how to set your own _id field values in MongoDB, with practical examples ranging from basic to advanced
  • All about MongoDBs _id Field - Navicat
    Open up any document in a MongoDB database and you'll notice an _id field: In fact, the ObjectId _id is the only field that exists across every MongoDB document In today's blog, we'll explore what it is and why it's important to your MongoDB database





中文字典-英文字典  2005-2009