mongodb 2 6

Mongodb Study Notes 2 (simple addition, deletion, query, and modification) 1. add a piece of data. I also practiced it yesterday, and today it is further consolidated. There are two main methods: save and insert. Example: db. blog. save ({"name": "taotao", "address": {"city": "beijing", "post": "100096"}, "phone ": "64645646"}) or db. blog. insert ({"name": "taotao", "address": {"city": "beijing", "post": "

friends punctuate praise bubbling; The paper refused, and then refused, three refused, refused to my upset, discouraged, but I still want to treat him as first love; Like a mushroom cool, lack of courage and confidence, silly miss, regret; (It seems that the two are rather sad ...) Other unexpected) Next year expect: Whether it is a technical book, or other types of books, you should read a lot; Develop a good habit of early to bed and early to eat break

Last night I ' d discovered that Charlie couldn ' t cook much besides friedeggs and bacon.Last night I finally found out that Charlie wouldn't do anything except fried eggs and bacon.So I requested that I am assigned kitchen detail for the duration of my stay.So I asked me to arrange for the details of the kitchen when I was there.So I asked me to take over the kitchen during the time I lived here.He was willing enough-hand over the keys to the banquet hall.He was willing to give me the key to t

figure. You can compare the effects before and after adjustments by checking or canceling the preview. There is an underlined letter p on the right side of the preview, which is the shortcut key. corresponding to the loading shortcut key L and storage shortcuts s and so on. Any such underlined letter can be turned on or off by pressing the ALT key on the keyboard. However, they are only valid when the Curve settings box appears. is not a shortcut key for global. If you want to delete a control

In this lesson, we discuss how and if to use factory providers, to enable dependencies that shouldn ' t is available to an Gular ' s DI.If you have the This service:class Loggerprovider { Constructor (Enabled:boolean) { if(enabled) { Console.log ( " Logger is enabled " ) } }}which requires you provide Param in constructor function.If you just the it like normal provider:@Component ({ 'todos', providers: [Todoservice, Loggerprovider], Template: ' ... ' })It w

passing in the context object to the Alertdialog.builder class, and the beginning of new is playing this role; Create a Alertdialog.builder instance tight * Then call the Set Method Configuration dialog box for the two Alertdialog.builder class (if you need to add a response code for Positivebutton, implement * Dialoginterface *. Onclicklistener, and replace null), and finally call the Create method of the Alertdialog.builder class for creating the Alertdialog * instance. */ ret

Success lies in persistence, giving yourself this sentence;Today, we review the numerical conversion methods of the two data types: parseint and parsefloat.Compared to number () method, the two methods of parse are relatively diligent, from left to right, and number is a comprehensive analysis;Can understand so parseint, he compared local tyrants, in the conversion value, from left to right, encountered non-digital time to stop the conversion, the back of the data are all thrown away;But parsein

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UOJ210 "Uer #6" looking for criminals Original title address : http://uoj.ac/problem/210 Test Instructions:N suspects, numbered 1 to N, under torture, they confessed some confessions, two types of confessions:1.xi says Yi is a prisoner.2.xi says Yi is not a prisoner.The confession of the offender is not always true, and it is not always true that all confessions of every prisoner are false, not the confess

this disk is to repair the entire database. However, unless extra space is used, the isolated disk area will not show any problems. In addition, if the compression operation is interrupted, a large portion of the free space in this set may become unavailable. In this case, we recommend that you perform another compression to complete the compression and restore the free space. Compression Effect You may run the collstats command (db. collectionname. Stats () in the shell) before and after compr

Mongodb distributed cluster (2. Replica set)Overview Replica set is a type of master-slave replication. It is a master-slave replication that comes with the Failover function. It solves the disadvantages of the master-slave replication and does not require human intervention when the master server fails, the system automatically selects a new master server. Deployment Diagram TheThe figure is a copy of so

appropriate settings on the Java client, the following is the Java Client Core code, of course, first of all, we need to do is to download the corresponding MongoDB Java driver The above code is not the complete code, is some of the core code, if you want to implement this, you can start from a single server read and write operations, the following gives a simple Java Client Implementation example, we are interested can be downloaded to look at. Inst

Delphi 6.02 preemptive research-bizsnap/soap/WebService 4-- Significance of patch 2 # Borland released the second patch for C ++ Builder 6 and Delphi 6. This is a very important patch for Delphi 6. It not only fixes some problems in Delphi 6, but also greatly enhanc

This paper (howto) describes step-by-step installation of Oracle 9i database software on Fedora Core 2, 3, 4, 5 and 6. This paper covers following steps: Pre-instalation tasks Download Install Post-instalation tasks Common installation errors Pre-instalation tasks 1. Create Oracle user account Login as root and create te user oracle which belongs to DBA group. Su- # Groupadd DB

1, IPhone 6 Plus Flex Although the iphone 6 Plus flex problem has been hotly discussed in the media, Apple says it is rare and only 9 customers have complained to the company about the iphone 6 Plus flex problem. We suspect that more users will be complaining about the problem in the coming weeks. The thin and larger fuselage means that the iphone

ArticleDirectory Enhanced Data Functions Higher performance and higher resource management efficiency Local Code interoperability is reconstructed SQL Server 2005 compact Edition Ajax Fewer software to be installed Support for URL-based Deployment Code signing is simplified New features provided by Windows Mobile 6 for developers (2) Other controls The control me

: Enter the CD Bin (the main demo is under the Window System) Continue input: mongod-dbpath= "D:\mongo\data" The last line of code tells us that the server port is on port 27107. Let's then reopen a command window to connect to the server: Under the corresponding root directory file: Enter MONGO: Here we can learn simple database operations: As a small white, if you do not know what commands, then you can enter help to assist you to view. MongoDB

[C #6] 2-nameof operator,0. Directory C #6 Add feature catalog1. Old Version code 1 using System; 2 namespace csharp6 3 { 4 internal class Program 5 { 6 private static void Main(string[] args) 7 { 8 if (args==null) 9 {10

Label:1,mongodb the same points and differences between insert () and save ()Difference: If there is a primary key in the new data, insert () will prompt the error, and save () changes the original content to the new content.Insert ({_id:1, "name": "N2"}) will report a duplicate error prompt for the primary key.Save ({_id:1, "name": "N2"}) will change N1 to N2.The same point: if there is no primary key in the new data, a record is added.

Super User-related: Hide and expand the copy code Use Admin # Adding or modifying user passwords DB. adduser ('admin', 'pwd ') # Viewing the user list DB. system. Users. Find () # User Authentication DB. Auth ('admin', 'pwd ') # Deleting a user DB. removeuser ('mongodb ') # View all users Show users # View all databases Show DBS # View all collections Show collections # View the status of each collection DB. printco