MongoDB Getting Started Guide, examples

First, the preparatory work

1. Download MongoDB

: Http://www.mongodb.org/downloads

Choose the right version for you

Related documents: Http://www.mongodb.org/display/DOCS/Tutorial

2. Installing MongoDB

A, no pressure mode:

Open the downloaded Mongodb-xxx.zip, find the bin directory, run Mongod.exe to start the service, the default port 27017,db save path is the root directory of the system C hard disk directory/data/db directory. That is, if your mongodb-xxx.zip is in the E-drive, then you need to build the data/db directory under C. MongoDB will not help you to build this directory.

Then run MONGO to connect to the test database, and you can manipulate the data. Run Help to display the assistance command line.

B, Decompression mode

Unzip the downloaded mongodb-xxx.zip to any directory, find the bin directory, run Mongod.exe to start MongoDB, the default port 27017,db save path is the current zip is the root directory of the hard disk directory/data/db directory. That is, if your mongodb-xxx.zip is in E, then you need to create the data/db directory under the E-disk. MongoDB will not help you to build this directory.

Then run MONGO to connect to the test database, and you can manipulate the data. Run Help to display the assistance command line.

3. Simple test

> 2+4

6

> DB

Test

>//Inserting data for the first time creates a database

Fri 16:47:39 Malformed UTF-8 character sequence at offset 27

Error2: (SHELLHELP1) exec failed:malformed UTF-8 character sequence at offset 27

> Db.foo.insert ({id:2011, userName: ' Hoojo ', age:24, email: "[email protected]"});

> Db.foo.find ();

{"_id": ObjectId ("4dd62b0352a70cbe79e04f81"), "id": "userName": "Hoojo",

"Age": "Email": "[email protected]"}

>

This completes the simple operation, displays the currently used database, and adds the data, queries the data operation

Second, DB Shell data operation

Shell command manipulation syntax is similar to JavaScript, in fact, the bottom of the console query statements are done with JavaScript script.

? Database

1. Help View command Prompt

Help

Db.help ();

Db.yourColl.help ();

Db.youColl.find (). Help ();

Rs.help ();

2. Switch/CREATE Database

>use Yourdb;

The current database is created automatically when a collection (table) is created

3. Query all databases

Show DBS;

4. Delete the currently used database

Db.dropdatabase ();

5. Cloning a database from a specified host

Db.clonedatabase ("127.0.0.1");

Clones data from a database on a specified machine to the current database

6. Copy the specified database data from the specified machine to a database

Db.copydatabase ("MyDB", "temp", "127.0.0.1");

Copy the MyDB data from the native to the temp database

7. Repairing the current database

Db.repairdatabase ();

8. View the database currently in use

Db.getname ();

db

The DB and GetName methods are the same effect and can query the currently used database

9. Display the current DB status

Db.stats ();

10. Current DB version

Db.version ();

11. View the current DB link machine address

Db.getmongo ();

? Collection Aggregation Collection

1. Create a Clustered collection (table)

Db.createcollection ("Collname", {size:20, Capped:5, max:100});

2. Get a clustered collection with the specified name (table)

Db.getcollection ("account");

3. Get all the aggregation sets of the current DB

Db.getcollectionnames ();

4. Displays the status of all clustered indexes in the current DB

Db.printcollectionstats ();

? User-related

1. Add a user

Db.adduser ("name");

Db.adduser ("UserName", "pwd123", true);

Add user, set password, read-only

2, database authentication, security mode

Db.auth ("UserName", "123123");

3. Show all current users

Show Users;

4. Delete users

Db.removeuser ("UserName");

? Other

1, the error message before the query

Db.getpreverror ();

2. Clear the Error Record

Db.reseterror ();

Three, collection aggregation set operation

? View Aggregate Collection basic information

1. View Help

Db.yourColl.help ();

2. Query the number of data bars in the current collection

Db.yourColl.count ();

3. View data space size

Db.userInfo.dataSize ();

4. Get the db where the current aggregation collection resides

Db.userInfo.getDB ();

5. Get the current aggregation status

Db.userInfo.stats ();

6, get the aggregate aggregate size

Db.userInfo.totalSize ();

7, aggregate storage space size

Db.userInfo.storageSize ();

8. Shard Version Information

Db.userInfo.getShardVersion ()

9. Clustered Collection Rename

Db.userInfo.renameCollection ("users");

Rename UserInfo to users

10. Delete the current aggregation collection

Db.userInfo.drop ();

? Clustered collection Query

1. Check all records

Db.userInfo.find ();

Equivalent to: SELECT * from UserInfo;

The default is 20 records per page, and you can query the next page of data with the IT iteration command when the display is not displayed. Note: Type the IT command cannot take ";"

However, you can set the size of the data displayed on each page, using Dbquery.shellbatchsize = 50, so that 50 records per page are displayed.

2. Duplicate data for a column in the current clustered collection after the query is removed

Db.userInfo.distinct ("name");

Will filter out the same data in name

Equivalent: Select Distict name from UserInfo;

3. Check the record of age = 22

Db.userInfo.find ({"Age": 22});

Equivalent to: SELECT * from userInfo where age = 22;

4. Check the records of age > 22

Db.userInfo.find ({age: {$gt: 22}});

Equivalent to: SELECT * from UserInfo where age > 22;

5. Check the records of age < 22

Db.userInfo.find ({age: {$lt: 22}});

Equivalent to: SELECT * from UserInfo where age < 22;

6. Check the records of age >= 25

Db.userInfo.find ({age: {$gte: 25}});

Equivalent to: SELECT * from UserInfo where age >= 25;

7. Check the records of age <= 25

Db.userInfo.find ({age: {$lte: 25}});

8. Query age >= 23 and age <= 26

Db.userInfo.find ({age: {$gte: $lte: 26}});

9. Query the data containing MONGO in name

Db.userInfo.find ({name:/mongo/});

Equal to percent

SELECT * from UserInfo where name is like '%mongo% ';

10, query the name in the beginning of MONGO

Db.userInfo.find ({name:/^mongo/});

SELECT * from UserInfo where name is like ' mongo% ';

11. Query the specified column name, age data

Db.userInfo.find ({}, {name:1, age:1});

Equivalent to: Select Name, age from UserInfo;

Of course name can also be used with true or false, as in the case of Ture River Name:1 effect, if False is to exclude name, display column information other than name.

12. Query the specified column name, age data, age > 25

Db.userInfo.find ({age: {$gt: +}}, {name:1, age:1});

Equivalent to: Select Name, age from UserInfo where age > 25;

13. Sort by age

Ascending: Db.userInfo.find (). Sort ({age:1});

Descending: Db.userInfo.find (). Sort ({Age:-1});

14. Query name = Zhangsan, age = 22 data

Db.userInfo.find ({name: ' Zhangsan ', age:22});

Equivalent to: SELECT * from userInfo where name = ' Zhangsan ' and "age = ' 22 ';

15, query the first 5 data

Db.userInfo.find (). Limit (5);

Equivalent: SELECT Top 5 * from UserInfo;

16, query 10 after the data

Db.userInfo.find (). Skip (10);

Equivalent to: SELECT * from UserInfo where ID not in (

Select Top Ten * from UserInfo

);

17, query the data between 5-10

Db.userInfo.find (). Limit (Ten). Skip (5);

Can be used for pagination, limit is Pagesize,skip is the first few pages *pagesize

18, OR and query

Db.userInfo.find ({$or: [{age:22}, {age:25}]});

Equivalent to: SELECT * from UserInfo where is age = 25

19. Query the first piece of data

Db.userInfo.findOne ();

Equivalent: SELECT top 1 * from UserInfo;

Db.userInfo.find (). limit (1);

20. Query the number of record bars for a result set

Db.userInfo.find ({age: {$gte: +}}). Count ();

Equivalent to: SELECT COUNT (*) from UserInfo where age >= 20;

21. Sort by a column

Db.userInfo.find ({sex: {$exists: true}}). Count ();

Equivalent to: SELECT COUNT (Sex) from userInfo;

? Index

1. Create an index

Db.userInfo.ensureIndex ({name:1});

Db.userInfo.ensureIndex ({name:1, TS:-1});

2. Querying all indexes of the current aggregation collection

Db.userInfo.getIndexes ();

3. View Total index record size

Db.userInfo.totalIndexSize ();

4. Read all index information for the current collection

Db.users.reIndex ();

5. Delete the specified index

Db.users.dropIndex ("Name_1");

6. Delete all index indexes

Db.users.dropIndexes ();

? Modify, add, and delete collection data

1. Add

Db.users.save ({name: ' Zhangsan ', age:25, sex:true});

Data column of the added data, not fixed, according to the data added

2. Modification

Db.users.update ({age:25}, {$set: {name: ' ChangeName '}}, False, True);

Equivalent to: Update users set name = ' ChangeName ' where age = 25;

Db.users.update ({name: ' Lisi '}, {$inc: {age:50}}, False, True);

Equivalent to: Update users set age = Age + where name = ' Lisi ';

Db.users.update ({name: ' Lisi '}, {$inc: {age:50}, $set: {name: ' HoHo '}}, False, True);

Equivalent to: Update users set age = Age +, name = ' HoHo ' WHERE name = ' Lisi ';

3. Delete

Db.users.remove ({age:132});

4, Query modification Delete

Db.users.findAndModify ({

    Update: {$set: {name: ' A2 '}, $inc: {age:2}},

    Remove:true

});

    Update: {$set: {name: ' A2 '}, $inc: {age:2}},

    Remove:true

});

update or remove One of them is a required parameter; Additional parameters are optional.

Parameters	Detailed	Default value
Query	Query Filter Criteria	{}
Sort	If multiple documents conform to a query filter, the first-ranked object will be selected in the arrangement specified by the parameter, and the object will be manipulated	{}
Remove	If true, the selected object will be deleted before it is returned	N/A
Update	A Modifier object	N/A
New	If true, the modified object is returned instead of the original object. In the delete operation, the parameter is ignored.	False
Fields	See Retrieving a subset of fields (1.5.0+)	All fields
Upsert	Creates a new object if the query result is empty. Example (1.5.4+)	False

? Statement block operations

1. Simple Hello World

Print ("Hello world!");

This notation calls the print function, and writes "Hello world!" directly The effect is the same;

2. Convert an object to JSON

Tojson (New Object ());

Tojson (New Object (' a '));

3. Loop Add data

> for (var i = 0; i < i++) {

... db.users.save ({name: "u_" + I, age:22 + i, sex:i% 2});

... };

This adds 30 data to the loop, and you can also omit the notation

> for (var i = 0; i < i++) Db.users.save ({name: "u_" + I, age:22 + i, sex:i% 2});

is also possible, when you use the Db.users.find () query, display multiple data and can not be displayed on a page, the use of it to view the next page of information;

4. Find Cursor Query

>var cursor = Db.users.find ();

}

This allows you to query all the users information, as well as to write

var cursor = Db.users.find ();

while (Cursor.hasnext ()) {Printjson (cursor.next);}

You can also omit the {} number

5. Foreach Iteration Loops

Db.users.find (). ForEach (Printjson);

A function must be passed in foreach to process data information for each iteration

6. Treat the Find cursor as an array

var cursor = Db.users.find ();

CURSOR[4];

Get the data for subscript index 4

Since it can be treated as an array, its length can be obtained: Cursor.length (); or cursor.count ();

So we can also display the data in a loop

for (var i = 0, Len = c.length (); i < Len; i++) Printjson (C[i]);

7. Convert the Find cursor to an array

> var arr = db.users.find (). ToArray ();

> Printjson (arr[2]);

To convert it to an array using the ToArray method

8. Customize our own query results

Only age <= 28 is displayed and only the Age column data is displayed

Db.users.find ({age: {$lte: +}}, {age:1}). ForEach (Printjson);

Db.users.find ({age: {$lte: +}}, {age:true}). ForEach (Printjson);

Exclude The Age column

Db.users.find ({age: {$lte: +}}, {Age:false}). ForEach (Printjson);

9. The Foreach transfer function displays information

Db.things.find ({x:4}). ForEach (function (x) {print (Tojson (x));});

As described above, foreach needs to pass a function that takes a parameter, that is, the object that is currently looping, and then processes the incoming parameter information in the function weight.

MongoDB Getting Started Guide, examples