In the last section, the view concept of MySQL database was introduced at the end. This chapter will give a detailed introduction to the centralized use of views. Before creating the view, we first create the student table, college table and student information table. By using the operation of the view to three tables, we can have a basic under ...
Added by Nacota on Sat, 18 May 2019 12:07:04 +0300
The whole crawler is based on selenium and Python, running the packages needed
Need to install selenium Firefox browser driver, Baidu search.
The whole crawler is modular. Functions and classes with different functions are placed in different files. Finally, constants that need to be configured are placed in consta ...
Added by ludwig on Sat, 18 May 2019 09:49:29 +0300
1. Download MySQL Community Server from the official website
2. Adding environment variables
3. Copy my-default.ini file under the root directory and rename it my.ini. The configuration is as follows:
# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.6/ ...
Added by jucedupp on Fri, 17 May 2019 21:11:31 +0300
Laravel loads the. env file in the project at startup. It is often useful for applications to run in different environments with different configurations. For example, you might want to use the tested Mysql database locally and switch the project to the production Mysql database automatically when it comes online. This article will introduce th ...
Added by kdidymus on Fri, 17 May 2019 12:59:48 +0300
I use 64-bit MySQL 5.7.20 to execute the following commands
1,wget commond not found
If you sign up for wget commond not found ation, you have not installed wget configuration for centos.
This command needs to b ...
Added by gladius on Fri, 17 May 2019 11:18:19 +0300
Reference to the following collation
Mysql Common Command Line Complete
1. Connect mysql
Format: mysql-h host address-u username-p user password
1. MYSQL connected to the local computer. (Assuming that both user name and password are root)
Firstly, open the DOS window, switch to the directory mysql bin, then type the comm ...
Added by kitegirl on Fri, 17 May 2019 00:03:44 +0300
Previously, we introduced the classes related to metadata management in CryptDB and the storage format of these classes in MySQL. This article describes when these metadata were created, when and how they were written to the database, when they were read, and where they were used.
Initialization and Metadata Readin ...
Added by reidme on Thu, 16 May 2019 22:45:15 +0300
Database read-write separation is an indispensable and important function for large-scale systems or high-volume Internet applications. For MySQL, the standard read-write separation is the master-slave mode. A write node Master is followed by multiple read nodes. The number of read nodes depends on the pressure of the system, usually the confi ...
Added by lucilue2003 on Thu, 16 May 2019 22:21:46 +0300
1. Create docker-compose.yml file
Start by creating a docker-compose.yml file that uses docker-compose to organize containers.
$ mkdri /zabbix #Create a zabbix file in the root directory
$ cd /zabbix
$ touch docker-compose.yml #Create yml container marshalling file
2. Writing the contents of yml documents
$ vim ...
Added by thebutler on Thu, 16 May 2019 06:46:27 +0300
The Role of Redis Distributed Locks
In a stand-alone environment, there is a second-kill commodity activity, in a short time, server pressure and traffic will rise sharply. This will lead to concurrency problems. If you want to solve concurrency, you need to solve it.
1. Improving system throughput, that is, requests processed by qps per second ...
Added by Drebin on Thu, 16 May 2019 01:18:22 +0300