Mixed定义混合类型 ObjectId定义对象ID Array定义数组 // model/BookModels constmongoose =require('mongoose') constBookSchema= mongoose.Schema({ name: {type:String,require:true},// 名称 unique: true必须唯一 不可以重复 不可以为空 author: {type:String,default:'匿名'},// 作者 默认值 ...
The Schema tab provides an overview of the data type and shape of the fields in a particular collection. Databases and collections are visible in the left-side navigation. The overview is based on sampling the documents in the collection. The schema overview may include additional data about the...
Mongoose值可以是哈希图。在Mongoose中,可以使用Schema.Types.Mixed数据类型来表示一个可以包含任意数据类型的值,包括哈希图。哈希图是一种键值对的数据结构,可以用来表示复杂的数据关系。 在MongoDB模式中建模哈希图时,可以使用Mongoose的Schema来定义一个包含哈希图的字段。例如: 代码语言:j...
Some examples of rigid schema data types are as follows: String, number, boolean, date, buffer, objectld, array, mixed, deciman128, map. Below-given example shows what a sample schema looks like: var userSchema = new mongoose.Schema({ userId: Number, Email: String, Birthday: Date, ...
type: String, required: true }, email: String, password: String, date: { type: Date, default: Date.now() }, info: Schema.Types.Mixed, //任意类型 }) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16.
Mixed : 混合类型 Array: 集合类型 3、创建Model Model:由Schema构造生成的模型,除了Schema定义的数据库骨架以外,还具有数据库操作的行为,类似于管理数据库属性、行为的类。 4、使用Model进行数据操作 可以使用Model对数据库进行增删改查的操作。 案例:
Type Description comment mixed Enables users to specify an arbitrary comment to help trace the operation through thedatabase profiler,currentOpoutput, andlogs. This option is available since MongoDB 4.4 and will result in an exception at execution time if specified for an older server version...
MongoDB中的集合查询(获取一组文档中某个字段的不同值列表) 运用方法:DBCollection对象方法中的 distinct() 语句: 语句结构:distinct(key,[query]) key字符串,指定获取哪个字段的不同值;query:包含标准查询选项的对象,指定了要从哪个文档中获取不同的字段值 ...
mixed Enables users to specify an arbitrary comment to help trace the operation through thedatabase profiler,currentOpoutput, andlogs. This option is available since MongoDB 4.4 and will result in an exception at execution time if specified for an older server version. ...
mixed:Schema.Types.Mixed, //该混合类型等同于nested _id:Schema.Types.ObjectId, //主键 _fk:Schema.Types.ObjectId, //外键 array:[], arrOfString:[String], arrOfNumber:[Number], arrOfDate:[Date], arrOfBuffer:[Buffer], arrOfBoolean:[Boolean], ...