mongoDB基本操作（一）
1.1. mongoDB基本操作1.1.1. 创建数据库
语法：use
> use admin
switched to db admin
>use rgf; #创建数据库rgf
switched to db rgf
> db.person.insert({name:'xuanxuan'}) #在rgf中创建集合person并插入一行数据
WriteResult({ "nInserted" : 1 })
1.1.2. 查看所有数据库
语法：show dbs
> show dbs;
admin (empty)
local 0.078GB
rgf 0.078GB
test0.078GB
1.1.3. 给指定数据库添加集合并添加记录
语法：db..insert({...})
> db.person.insert({age:'10'});
WriteResult({ "nInserted" : 1 })
>db.person.insert({age:'10'},{sex:'male'});
WriteResult({ "nInserted" : 1 })
1.1.4. 查看数据库中的所有文档
语法：showcollections;
> show collections;
person
system.indexes
1.1.5. 查询指定文档的数据
语法：
查询所有:
db..find();
查询第一条数据：
db..findone()
> db.system.indexes.find()
{ "v" : 1, "key" : {"_id" : 1 }, "name" : "_id_", "ns" :"rgf.person" }
> db.person.find()
{ "_id" :ObjectId("549b31b7ff3a181677422f47"), "name" :"xuanxuan" }
{ "_id" :ObjectId("549b32ebff3a181677422f48"), "age" :"10" }
{ "_id" :ObjectId("549b3352ff3a181677422f49"), "age" :"10" }
> db.person.insert({age:'20'},{sex:'male'});
WriteResult({ "nInserted" : 1 })
> db.person.findone()
2014-12-25T05:58:14.270+0800 TypeError:Property 'findone' of object rgf.person is not a function
> db.person.findOne()
{ "_id" : ObjectId("549b31b7ff3a181677422f47"),"name" : "xuanxuan" }
注意函数findOne中的O一定要大写。
1.1.6. 更新文档数据
语法：
db..update({查询条件},{更新内容})
例：
varp = db.person.findOne()
db.person.update(p,{name:"gaogao"})
>db.person.update({name:'xuanxuan'},{$set:{name:'zhaoxing'}})
WriteResult({ "nMatched" : 1,"nUpserted" : 0, "nModified" : 1 })
> db.person.findOne()
{ "_id" :ObjectId("549b31b7ff3a181677422f47"), "name" :"zhaoxing" }
>
> var p = db.person.findOne()
> p
{ "_id" :ObjectId("549b31b7ff3a181677422f47"), "name" :"zhaoxing" }
>db.person.update(p,{name:"gaogao"})
WriteResult({ "nMatched" : 1,"nUpserted" : 0, "nModified" : 1 })
> p
{ "_id" :ObjectId("549b31b7ff3a181677422f47"), "name" :"zhaoxing" }
> var p = db.person.findOne()
注意此时需要再一次赋值变量
> p
{ "_id" : ObjectId("549b31b7ff3a181677422f47"),"name" : "gaogao" }
>
{ "_id" :ObjectId("549b31b7ff3a181677422f47"), "name" :"gaogao2", "age" : 2 }
mongo默认更改第一条数据。
>db.person.update({age:"10"},{$set:{age:5}})
WriteResult({ "nMatched" : 1,"nUpserted" : 0, "nModified" : 1 })
> db.person.find()
{ "_id" :ObjectId("549b32ebff3a181677422f48"), "age" : 5 }
{ "_id" :ObjectId("549b3352ff3a181677422f49"), "age" :"10" }
{ "_id" :ObjectId("549b3508ff3a181677422f4a"), "age" :"20" }
{ "_id" :ObjectId("549b31b7ff3a181677422f47"), "name" : "gaogao2","age" : 2 }
>
1.1.7. 删除文档中的数据
语法：
db..remove({...})
> db.person.find()
{ "_id" :ObjectId("549b32ebff3a181677422f48"), "age" : 5 }
{ "_id" :ObjectId("549b3352ff3a181677422f49"), "age" :"10" }
{ "_id" :ObjectId("549b3508ff3a181677422f4a"), "age" :"20" }
{ "_id" :ObjectId("549b31b7ff3a181677422f47"), "name" :"gaogao2", "age" : 2 }
> db.person.remove({age:"10"})
WriteResult({ "nRemoved" : 1 })
> db.person.find()
{ "_id" :ObjectId("549b32ebff3a181677422f48"), "age" : 5 }
{ "_id" :ObjectId("549b3508ff3a181677422f4a"), "age" :"20" }
{ "_id" :ObjectId("549b31b7ff3a181677422f47"), "name" :"gaogao2", "age" : 2 }
>
页:
[1]