MONGODB 数据存储的方式是通过压缩后的BSON的方式进行数据存储的这样的方式有利于数据的压缩,但在工作的过程中,MONGODB 的数据类型其实倒是被使用者忽略的。此时如果问一下Mongodb 到底有多少,数据类型data types 可能一时还真说不清。
> db.data.insert({type1:array_1,type2:array_2}) WriteResult({ "nInserted" : 1 }) 5 Binary data 对于一些图片或声音的信息可以将数据转换为二进制的格式,并将数据插入到MONGODB 中,这里就需要通过BinData 函数来将二进制数据存入MONGODB > var a = BinData(0,"JA4A8gAxqTwciCuF5GGzAA==") >...
mongoshell 默认将所有的数字处理为 64位浮点的double值。mongoshell 提供了NumberDecimal()构造函数限制指定 128位 基于十进制的浮点值,能够以精确的精度仿效十进制近似值。 这个功能专为处理monetary data的应用而设计,例如金融、税务以及科学计算等。 decimalBSON type使用 IEEE 754十进制 128为浮点数的格式,支持34...
BinData ObjectId Boolean Date Timestamp Regular Expression MaxKey (internal type) 数值类型 MongoDB treats some types as equivalent for comparison purposes. For instance, numeric types undergo conversion before comparison. //数值类型比较前会转为同一类型比较。 字符串 二进制比较 MongoDB默认采用简单的二...
Types Check Types in the mongo ShellMongoDB BSON provide support for additional data types than JSON. Drivers provide native support for these data types in host languages and the mongo shell also provides several helper classes to support the use of these data types in the mongo JavaScript shel...
MongoDB’s flexible schema makes it easy to unify diverse data types, such as order histories and location-specific inventories. Order data is especially well-suited to MongoDB's flexible document model because it often includes a variety of attributes that can change over time, such as product...
一个键对应的值,可以是任意一种BSON数据类型data types,甚至是文档、其他文档、数组、或者文档数据 代码语言:txt 复制 var mydoc = { _id: ObjectId("5099803df3f4948bd2f98391"), name: { first: "Alan", last: "Turing" }, birth: new Date('Jun 23, 1912'), ...
MongoDB data types supported by MongoDB Reader MongoDB Reader supports most MongoDB data types. Make sure that the data types of your database are supported. For fields of the supported data types, take note of the following items: For fields of basic data types, the synchronization task ...
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MongoDB Reader supports most MongoDB data types. Make sure that the data types of your database are supported. For fields of the supported data types, take note of the following items: For fields of basic data types, the synchronization task automatically reads data of the fields from the ...