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Mongodb Study Notes 02 and mongodb Study NotesMongodb Study Notes 02-CURD operations CURD indicates Create, Update, Read, and Delete operations. Create a database Directly use the database name and create a collection to create a database. Create collecion db.createCollection("collectionName") Create collection implicitly db.collectionName.insert({xxxxxx})

[Web Development Study Notes] Structs2 Result Study Notes (1) Brief IntroductionStructs2 Result Study Notes (1) Brief Introduction Question 1 Dispatcher-forward uses the server to jump to the server and display the action Redirect-redirect to jsp Chain server jumpRedirectAction Question 2 chain jump-> jump from an action to another action in the package: The ex

Sqlite study notes 7: Open the database using sqlite in C language, sqlite Study Notes The basic content of the database has been mentioned earlier. Next, let's take a look at how to use sqlite in the C language. Interface 1 sqlite3_open(const char *filename, sqlite3 **ppDb) Open the database. If the database does not exist, create a new database and open sqlite3_close(sqlite3*) Shut down the database.

Study Notes on Cocos 3D functions (1) --- camera and cocos Study Notes Personal Original, welcome to reprint, reprint please note the address, column address http://blog.csdn.net/bill_man Preface With the improvement of mobile phone hardware and fierce competition in the gaming industry, gamers no longer need to meet the requirements of the Game Image in 2D mode. In the past, 3D Game Development was general

QT Study Notes (1)-recognition of the ui and recognition of the qt Study Notes ui /// // 2015/08/06 /////////////////// /// // By xbw ////////////////////////// //// // Environment Qt Creator 5.3.1 //// Finally, I have time to study QT well. Before that, I have some knowledge about the powerful graphical interface of QT. Let's take a note; Section 1 UI Step by s

[Unity 3D] Study Notes forty-five: Game instances-kill the wall, unity Study Notes Use this game instance to summarize all the previously reviewed knowledge about physical engines. In the game, a ball shell is sent to kill the front wall. A rigid body component is added to both shells and walls, a particle system is bound to shells, and five different colors are added to the shell particle animation to disp

MySQL Study Notes summary, mysql Study Notes Slow SQL: A Query whose execution time exceeds the specified time range is called a slow query.In MySQL, how does one record slow SQL statements?A: You can set the following information in my. cnf: [mysqld]; enable the slow query log, default 10 secondslog-slow-queries; log queries taking longer than 5 secondslong_query_time = 5; log queries that don't use indexe

One-day-Study Notes-send text messages when goods are sold, one-day-Study NotesPersonal Study Notes (one) Send SMS when goods are sold as required Html code omitted ..... Model Code omitted ..... 1/* 2 * modify 3 * State public 4 * Author: lzp Time: 2016-05-27 5 * --------------------------------------------------- 6 */7 8 public function changeStateAction () {9

SQL Database Study Notes and SQL Database Study Notes Although learning is slow, you need to learn it step by step. Study Notes: 1. SQL statements are case insensitive 2. MySQL requires a semicolon; 3. Used commands: Show databases; // display the number of databases that exist. create database first_lesson; // create a database use first_lesson; // use this dat

Swift 2.0 Study Notes (Day 9) -- leave the expression and try again !, Swift Study Notes Swift 2.0 Study Notes (Day 9) -- leave the expression and try again! For Original Articles, please reprint them. Reprinted Please note: Guan Dongsheng's blog Expressions are very important. In Swift, there are three forms of expressions. L data type not specified Var

Linux System Study Notes: Preface, linux Study NotesLinux System Study Notes: Preface Zookeeper Linux is a free-of-charge and freely-spread Unix-like operating system. It is a POSIX and UNIX-based operating system that supports multiple users, multi-tasking, multithreading, and multi-CPU. It can run major UNIX tool software, applications and network protocols. I

Linux Study Notes (6)-Work Management, linux Study Notes What is job management? The job is translated from the job command. The job command can view the processes that work in the background. For example, what is job management? It takes a lot of time to package a large directory, but you also need to use other commands. You will think that I can log on to several terminals. In/etc/security/limits. conf,

Compilation of beginner Study Notes (13)-External interruptions, compilation of Study Notes Getting started with crazy summer vacation Study Notes (13th)-out-of-band interruption Reference: Chapter 15th of Assembly Language 1. External interruption Information External interruptions can be divided into shielded interruptions and unshielded interruptions. Blocke

1. This week study summary 1.1 summarizes the set and generic related content in the way you like (mind map or other).1.2 Choose: Collect code snippets that you think are usefullistString,integer>> list = new arrayliststring,integer> > (Map.entryset ()); Scanner in = new Scanner (line); 2. Written assignment 1. Deletion of the specified element in list (topic 4-1) 1.1 Experiment Summary: The returned array element type is object, and the c

HTTP Study Notes-URL and resource, http Study Notes urlWhat is URL? All things have a standard things, bus line number, plane flight number, personal ID card number, you take a taxi, tell the driver I want to go to Shi Pai, then he can understand what you mean. URL is the standardized name of Internet resources. The URL points to an electronic information clip, telling you where they are located and how to

MongoDB Study Notes (1) -- install MongoDB in Windows and take mongodb Study Notes First, download the windows Installation Package for mongodb from the official website, select a 32-bit or 64-bit version based on your system type, and then follow the prompts to complete the next step. If the installation directory is not modified, it will be installed in the C: \ Program Files \ MongoDB directory by defaul

First, the component design 1, the overall preview 2, the Image Wizard add(1) First add a canvas in Adjust properties (2) Adding sprites Add sprites, then upload a picture for property modification 3. Join Clock Direct join, set to 1000ms Second, block programming1. Block function Establishment (1) First select this module, change procedure to Movemole Then add the module to the right, the composition of the diagram is as follows The module in which the random number is found in math. Focus

In-depth study of c language article 3, in-depth study of c Article 3 This article studies other tools in TC2.0. At the same time, let's take a look at the TC process from the source code to the exe program. 1. Use TCC to compile the following program into a. obj file We know that TCC is divided into the following two steps in the default compilation to connect a c language source program a. c: (1). TCC co

WPF Study Notes (1): bind data elements to elements. wpf Study NotesPreface As a cainiao, I learned WPF for a while, but I didn't summarize it. After a semester, I found that many things have been forgotten. I still need to write down many things for future review. Data Binding is widely used in events and can effectively reduce the amount of code. What is data binding? To put it simply, extract some inform

Quartz. Net Study Notes (2)-introduction, quartz.net Study Notes1. What is Quartz. Net? 1. Source Quartz. Net is an open-source job scheduling framework;2. Address: http://www.quartz-scheduler.net/documentation/index.html Source Code address: https://sourceforge.net/projects/quartznet/Ii. What can Quartz. Net do? Timed round robin Database Synchronization and timed email notificationIii. Design Pattern in Q