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MongoDB数据库基础 MongoDB数据库基础操作总结

huangyuxin_ 人气:0

本文实例讲述了MongoDB数据库基础操作。分享给大家供大家参考,具体如下:

1.创建数据库

>use test
 
> db.test.insert({"name":1})

2.查看数据库

>show dbs

3.删除数据库

> use test
 
> db.dropDatabase()

4.创建集合

4.1 集合概念

> db.title.insert({"name":"hyx"})

5.查看集合

> show collections

6.删除集合

>use test
 
>db.title.drop()

7.插入文档

7.1 文档概念

> db.file.insert({name:"huangyuxin",age:11})

8.查看文档

>db.files.find()

9.变量方式插入文档

> document=({by:"hyx"})
{ "by" : "hyx" }
> db.file.insert(document)
WriteResult({ "nInserted" : 1 })
> db.file.find()
{ "_id" : ObjectId("5c6e8a060fc535200b893f29"), "name" : "huangyuxin", "age" : 11 }
{ "_id" : ObjectId("5c6e8b1c0fc535200b893f2a"), "by" : "hyx" }
>

10.同时插入多条

> var res = db.file.insertMany([{"b": 3}, {'c': 4}])
> res
{
    "acknowledged" : true,
    "insertedIds" : [
        ObjectId("5c6e8bba0fc535200b893f2b"),
        ObjectId("5c6e8bba0fc535200b893f2c")
    ]
}
> db.file.find()
{ "_id" : ObjectId("5c6e8a060fc535200b893f29"), "name" : "huangyuxin", "age" : 11 }
{ "_id" : ObjectId("5c6e8b1c0fc535200b893f2a"), "by" : "hyx" }
{ "_id" : ObjectId("5c6e8bba0fc535200b893f2b"), "b" : 3 }
{ "_id" : ObjectId("5c6e8bba0fc535200b893f2c"), "c" : 4 }
>

11.更新文档

> db.file.update({"name":"huangyuxin"},{$set:{"name":"hyx"}})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.file.find()
{ "_id" : ObjectId("5c6e8a060fc535200b893f29"), "name" : "hyx", "age" : 11 }
{ "_id" : ObjectId("5c6e8b1c0fc535200b893f2a"), "by" : "hyx" }
{ "_id" : ObjectId("5c6e8bba0fc535200b893f2b"), "b" : 3 }
{ "_id" : ObjectId("5c6e8bba0fc535200b893f2c"), "c" : 4 }
{ "_id" : ObjectId("5c6e8cdf0fc535200b893f2d"), "name" : "hyx" }
>
> db.file.save({"_id" : ObjectId("5c6e8b1c0fc535200b893f2a"),"name":"hyx"})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.file.find()
{ "_id" : ObjectId("5c6e8a060fc535200b893f29"), "name" : "hyx", "age" : 11 }
{ "_id" : ObjectId("5c6e8b1c0fc535200b893f2a"), "name" : "hyx" }
{ "_id" : ObjectId("5c6e8bba0fc535200b893f2b"), "b" : 3 }
{ "_id" : ObjectId("5c6e8bba0fc535200b893f2c"), "c" : 4 }
{ "_id" : ObjectId("5c6e8cdf0fc535200b893f2d"), "name" : "hyx" }
>

12.删除文档

12.1删除指定文档

> db.title.find()
{ "_id" : ObjectId("5c6e89060fc535200b893f27"), "name" : "yx" }
> db.file.find()
{ "_id" : ObjectId("5c6e8a060fc535200b893f29"), "name" : "hyx", "age" : 11 }
{ "_id" : ObjectId("5c6e8b1c0fc535200b893f2a"), "name" : "hyx" }
{ "_id" : ObjectId("5c6e8bba0fc535200b893f2b"), "b" : 3 }
{ "_id" : ObjectId("5c6e8bba0fc535200b893f2c"), "c" : 4 }
{ "_id" : ObjectId("5c6e8cdf0fc535200b893f2d"), "name" : "hyx" }
> db.file.remove({"b":3})
WriteResult({ "nRemoved" : 1 })
> db.file.find()
{ "_id" : ObjectId("5c6e8a060fc535200b893f29"), "name" : "hyx", "age" : 11 }
{ "_id" : ObjectId("5c6e8b1c0fc535200b893f2a"), "name" : "hyx" }
{ "_id" : ObjectId("5c6e8bba0fc535200b893f2c"), "c" : 4 }
{ "_id" : ObjectId("5c6e8cdf0fc535200b893f2d"), "name" : "hyx" }
>

12.2删除全部文档

>db.file.deleteMany({})

12.3删除多个文档

>db.file.deleteMany({ status : 1 })

13.条件表达式

13.1$gt 大于

> db.title.find({age:{$gt : 0}})
{ "_id" : ObjectId("5c6f7d633ea8783bbfb7fd5e"), "age" : 10 }
>

13.2 $lt 小于

13.3 $gte 大于等于 $lte 小于等于

> db.title.find({age:{$gte : 1}})

13.4 大于小于

> db.title.find({age:{$lt:13,$gt:10}})
{ "_id" : ObjectId("5c6f7ded3ea8783bbfb7fd5f"), "age" : 12 }
{ "_id" : ObjectId("5c6f7e833ea8783bbfb7fd60"), "age" : 12 }
>

13.5 $ne 不等于 $eq 等于

14. $type操作符

> db.title.find({"name" : {$type : 2}})
{ "_id" : ObjectId("5c6e89060fc535200b893f27"), "name" : "yx" }
>

15. limit()

> db.title.find().limit(2)
{ "_id" : ObjectId("5c6e89060fc535200b893f27"), "name" : "yx" }
{ "_id" : ObjectId("5c6f7d633ea8783bbfb7fd5e"), "age" : 10 }
>
> db.title.find({},{"name":1,_id:0}).limit(1)
{ "name" : "yx" }
>

16.skip() 

17.sort()

> db.title.find({},{'age':1,_id:0}).sort({age:1})
{ }
{ "age" : 10 }
{ "age" : 12 }
{ "age" : 12 }
> db.title.find({},{'age':1,_id:0}).sort({age:-1})
{ "age" : 12 }
{ "age" : 12 }
{ "age" : 10 }
{ }
>

18.索引

18.1 创建单个索引

>db.title.createIndex({"age":1})

18.2 创建多个索引

>db.title.createIndex({"name":1,"age":-1})

18.3 查看索引

>db.col.getIndexes()

18.4 查看索引大小

>db.col.totalIndexSize()

18.5 删除所有集合索引

>db.col.dropIndexes()

18.6 删除指定索引

>> db.title.dropIndex({'age':1})
{ "nIndexesWas" : 2, "ok" : 1 }
>

希望本文所述对大家MongoDB数据库程序设计有所帮助。

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