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MySQL database, how to modify the value of the JSON data type? JSON field values are modified by the Json_set function?

Tags: auto address Modify select span key values CTE BeijingRequirements Description :Today I look at the problem of storing JSON data types in MySQL, and for modifying the JSON data,Under this record.Operation Process :1. Create a table with JSON data types, insert the underlying dataMysql> CREATE TABLE Tab_json (ID int not NULL auto_increment primary key,data JSON); Query OK, 0 rows affected (0.03 sec) mysql> insert into Tab_json values (null, ' {' name ': '

Data structure with algorithmic JavaScript reading notes

: var names = ["David", "Cynthia", "Raymond", "Clayton", "Mike", "Jennifer"];var namestr = Names.join ();p rint (names TR); David,cynthia,raymond,clayton,mike,jennifernamestr = names.tostring ();p rint (NAMESTR); David,cynthia,raymond,clayton,mike,jennifer in fact, when using the print () function directly on an array, the system automatically calls the ToString

Primary FTP Setup

on client [[emailprotected] ~]# ftp 192.168.4.5 ... Name (192.168.4.5:root): Lisi 331 Please specify the password. Password: ... ftp> pwd 257 "/home/lisi" on server-side configuration [[emailprotected] ~]# cd/etc/vsftpd/ [[email Protected] vsftpd]# CP vsftpd.conf Vsftpd.conf.bak [[emailprotected] vsftpd]# vim vsftpd.conf ... Chroot_local_user=yes ... [[emailprotected] vsftpd]# service vsftpd Restart on client test: [[emailprotected] ~]# FTP 192.168.4.5 ... Name (192.168.4.5:r

The correct realization of shallow copy and deep copy

implement a shallow copy or deep copy within the Clone method as required. The implementation code for a simple shallow copy is as follows:classemployee:icloneable{ Public stringIdcode {Get;Set; } Public intAge {Get;Set; } PublicDepartment Department {Get;Set; } Public ObjectClone () {return This. MemberwiseClone (); }}classdepartment{ Public stringName {Get;Set; } Public Override stringToString () {return This. Name; }}//calledEmployee Mike

Remote Desktop Services

Work Assignment Descriptionin the previous project, After HT company deployed Windows Server for HW , the administrator always discovers that there is a problem with the server, but because HT Company's server is not local, it requires HT The Administrator of the company manages the server using a remote management approach. Project requirements:1, on the server set up a normal user Mike;2, the client on the use of

Elementary FTP construction and ftp Construction

: // lisi: 123456@192.168.4.5/lisi.txt download file test Experiment summary:Anonymous users and local users can log onAn anonymous user logs on to/var/ftp and can only download files but cannot upload files.The local user logs on to the Home Directory of the local user and can upload and download the Home Directory of the user. Lab 3:Banned local users in their home directoriesTutorial steps:Test the default result on the client first[Root @ pc205 ~] # Ftp 192.168.4.5...Name (192.168.4.5: root)

10 Linux commands that every programmer needs to know

options too. -A,--all do not ignore entries starting with.2, Touch,cat and less commandsThe touch command can create any type of file of size 0 on a Linux system, and as a program developer, you can use the Touch command when you need to create files on a Linux server:Syntax: Touch The cat command is used to view the contents of a file, but using the cat command does not edit the contents of the file, it is only possible to browse the contents of the file. The cat comm

Simulating classes (class) and inheritance relationships in JavaScript _javascript techniques

chain inheritance (inheritance between objects) Class inheritance (inheritance between constructors) Prototype chain inheritance What is a prototype chain inheritance? Here I will not say what definition. In fact, the parent is inherited with prototype. As an example: function Parent () { this.name = ' Mike '; } function Child () { this.age =. } Child.prototype = new parent ();//child inherits parent, through prototype, form chai

10 Cool tools from the Docker community "translated 100%"

tool! Many users run a custom version of Minecraft game server in a Docker container. But Dockercraft is a visual management client of the Minecraft Docker container. Toggle the switch and a container is turned on or off. By clicking on a button, you can destroy a container. Dockercraft is an interesting project--it's easy to get hooked--from Docker engineers Adrien Duermael and Gaetan de Villele. 3. Docke

It's so annoying that it takes so long for the water question to be done, and then .... No more ....

H Jesus! The Minecraft server of xadillax's came authentication ss a bug!There's one way to solve this bug in game. that is to get a bucket of water and a bucket of lava and mix them To obsidian. but remember, you must get water first, or the server will explode! Boom ~Fortunately there is a row of buckets at front of hungar, he can save the world! Some of buckets are filled with water and some are lava. remember that hungar can only move forward, tha

Top ten reasons to use Visual Studio for Android development

software development companies. Specific platforms, cross-platform, new popular applications such as Facebook Moments, Dropbox, Office, Skype, popular games (for example: Fruit Ninja, Tribal Wars, EA Sports Titles) are all written in cross-platform C + +. To speak in numbers, if you look at the top 50 Android apps, a chunk (about 75%) of them is in C + +. In today's cross-platform world, if you want to optimize fast iterations, application performance, and the look and feel of the native. Most

Reasons for my world's million B8 crash and the perfect solution

  "0.11.0 Build8 the cause of the retreat" Because Minecraft Pocket Edition 0.11.0 build8 new Google services, if the mobile phone does not have Google framework (Google Play) will be a flash back.   "0.11.0 Build8 Solution" The solution is actually very simple, as long as you Baidu Google Play installed on it, installation files Occupy memory space will not be too much, do not need root. If you don't install it, your

My world mobile phone version of him js details

My World mobile phone version of JS is what? JS is actually equivalent to the MoD, or can be said to be a script, plug-ins or plug-in, by triggering events to achieve the purpose of the MoD. JS is easier to write than MoD. Herobrine is a myth in the sandbox game "Minecraft", a fictional character in a horror story, a symbol of the Minecraft community. JS Introduction: 1. Summon, him will sum

Unity repeatable random Number

Sourcehttps://blogs.unity3d.com/cn/2015/01/07/a-primer-on-repeatable-random-numbers/(English version)Http://www.manew.com/thread-37144-1-1.htmlNo matter what kind of program you create, you can almost do without random numbers. If you want to generate the same results multiple times, this requires that the random number is repeatable.In this article we will describe the use of levels or the world of generation as an example, but the principles also apply to many other things, such as procedural

12 reasons Java technology has long occupied the main position _java

of the most frequently mentioned NoSQL options. Then there are programs like acid-state that use Haskell to write and run in a Java virtual machine. These tools are usually open source and can be easily integrated. Some developers run them independently, and others integrate them into their own modules such as libraries. Either way, Java becomes a common language in the database layer, ensuring that Java developers ' lives are simpler. They worry less about the glitch caused by character encod

8 object creation modes in JS

and methods in the prototype field of the class just like calling its own properties. The class can indirectly call the attributes and methods in the prototype domain by calling the prototype attribute.Note: After an object is obtained through a class instance, the object does not have the prototype attribute, but the object can directly access the content of the prototype field of the category class like the access attribute. The instance object has a private attribute.Proto,ProtoProperties an

The cliché of the 5 inheritance of JavaScript

继承is a constructor that calls a super-type inside a subtype constructor.Strict class-type inheritance is not very common, and is generally combined with:function Super(){ this.colors=["red","blue"];} function Sub(){ Super.call(this);}原型式继承is to create a new object with an existing object, to point the prototype of the subclass to the parent class, which is equivalent to adding the parent class to the prototype chainPrototype chain inheritanceIn order for subclasses to inherit the attributes o

MySQL index usage instructions (single-column index and multi-column index), mysql multiple columns

MySQL index usage instructions (single-column index and multi-column index), mysql multiple columns 1. Single Column Index In the performance optimization process, selecting the columns to create an index is one of the most important steps. You can consider using two types of indexes: columns that appear in the Where clause and columns that appear in the join clause. See the following query: Select age # Do not use the index FROM people Where firstname = 'Mi

The PyMongo method in Python3 is described in detail.

, 'gender': 'male'} Here, we specify the student's student ID, name, age, and gender, and then directly call the collectioninsert()Method To insert data. result = collection.insert(student)print(result) In MongoDB, each piece of data actually has a unique _ id attribute. If _ id is not explicitly specified, MongoDB will automatically generate an ObjectId type _ id attribute.insert()The _ id value returned after the method is executed. Running result: 5932a68615c2606814c91f3d Of course, we can al

A detailed description of how JavaScript inherits

inheritance is also based on the prototype chain.Prototype inheritance and class-style inheritance类式继承is a constructor that calls a super-type inside a subtype constructor.Strict class-type inheritance is not very common, and is generally combined with:Super () { this.colors=["Red","Blue"];} Sub () {Super.call (this);} 原型式继承is to create a new object with an existing object, to point the prototype of the subclass to the parent class, which is equivalent to adding the parent class to the

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