21 days learning mongodb notes

Install local MongoDB

 stay bin  Under the path of 


mongod --dbpath c:\data\db

perform MongoDB Code for ：

> 2 + 2
4
> db
test


> db.runoob.insert({x:10})
WriteResult({ "nInserted" : 1 })


> db.runoob.find()
{ "_id" : ObjectId("625eaa86311de6f041f0ac26"), "x" : 10 }
> use mydb
switched to db mydb
> db
mydb
> show dbs
admin   0.000GB
config  0.000GB
local   0.000GB
test    0.000GB
> db.movie.insert({"name":"tutorials point"})
WriteResult({ "nInserted" : 1 })
> show dbs
admin   0.000GB
config  0.000GB
local   0.000GB
mydb    0.000GB
test    0.000GB
> use mydb
switched to db mydb
> db.createCollection("mycollection")
{ "ok" : 1 }
> show collections
movie
mycollection
> db.createCollection("mycol", { capped : true, autoIndexID : true, size : 6142800, max : 10000 } )
{
        "ok" : 0,
        "errmsg" : "BSON field 'create.autoIndexID' is an unknown field.",
        "code" : 40415,
        "codeName" : "Location40415"
}
> db.createCollection("mycol", { capped : true, autoIndexID : true, size : 6142800, max : 10000 } )
{
        "ok" : 0,
        "errmsg" : "BSON field 'create.autoIndexID' is an unknown field.",
        "code" : 40415,
        "codeName" : "Location40415"
}
> db.createCollection("mycol",{capped :true, autoIndexID:true, size : 614800\, max:10000})
uncaught exception: SyntaxError: invalid escape sequence :
@(shell):1:74
> db.createCollection("mycol",{capped :true, autoIndexID:true, size : 614800, max:10000})
{
        "ok" : 0,
        "errmsg" : "BSON field 'create.autoIndexID' is an unknown field.",
        "code" : 40415,
        "codeName" : "Location40415"
}
> use mydb
switched to db mydb
> db.createCollection("mycol", { capped : true, autoIndexID : true, size : 6142800, max : 10000 } )
{
        "ok" : 0,
        "errmsg" : "BSON field 'create.autoIndexID' is an unknown field.",
        "code" : 40415,
        "codeName" : "Location40415"
}
> db.createCollection("mycol",{capped :true, autoIndexID:true, size : 614800, max:10000})
{
        "ok" : 0,
        "errmsg" : "BSON field 'create.autoIndexID' is an unknown field.",
        "code" : 40415,
        "codeName" : "Location40415"
}
> show collections
movie
mycollection
> db.createCollection("mycol",{capped :true,  size : 614800, max:10000})
{ "ok" : 1 }
> db.createCollection("mycol",{capped :true, ndexID:true, size : 614800, max:10000})
{
        "ok" : 0,
        "errmsg" : "BSON field 'create.ndexID' is an unknown field.",
        "code" : 40415,
        "codeName" : "Location40415"
}
> db.createCollection("mycol",{capped :true, ndexID:true, size : 614800, max:10000})
{
        "ok" : 0,
        "errmsg" : "BSON field 'create.ndexID' is an unknown field.",
        "code" : 40415,
        "codeName" : "Location40415"
}
> show collections
movie
mycol
mycollection
> show collections
movie
mycol
mycollection
>

MongoDB The following data types are supported ：

• String： character string . Data types commonly used to store data . stay MongoDB in ,UTF-8 The encoded string is legal .
• Integer： Integer values . For storing values . Depending on which server you use , Can be divided into 32 Bit or 64 position .
• Boolean： Boolean value . Used to store Boolean values （ really / false ）.
• Double： Double precision floating point value . Used to store floating point values .
• Min/Max keys： Combine a value with BSON（ The binary JSON） The ratio of the lowest value of an element to the highest value .
• Arrays： Used to store an array or list or values as a key .
• Timestamp： Time stamp . Record when the document was modified or added .
• Object： Used for embedded documents .
• Null： Used to create a null value .
• Symbol： Symbol . This data type is basically the same as the string type , But the difference is , It is commonly used in languages with special symbol types .
• Date： Date time . use UNIX Time format to store the current date or time . You can specify your own time and date ： establish Date object , Incoming year, month and day information .
• Object ID： object ID. For creating documents ID.
• Binary Data： binary data . Used to store binary data .
• Code： Code type . Used for storage in documents JavaScript Code .
• Regular expression： Regular expression type . Used to store regular expressions .