In recent years, the business of leader 1-to-1 has been developing rapidly, but at the same time, he has encountered "growing pains". With the increasing number of microservices, the traffic further increases, and the hardware resources are a little overwhelmed. Then, how to achieve better flow protection measures such as curr ...
Added by webtailor on Mon, 18 May 2020 09:32:34 +0300
In the previous article, I introduced the logic of relationship mapping in Entity Framework Core. The foreign key mapping of EF left in the previous article is not mentioned, that is, the relationship of one-to-one, one to many, many to one, many to many, etc. This article will give you a detailed analysis of how to set up these mappings.
1. Re ...
Added by imawake on Sun, 17 May 2020 08:59:50 +0300
1, Date and time functions
1. Function to get the current dateIt's the same. It's different
CURDATE() : Used to get the current date of the system
CURRENT_DATE() Used by the system to get the current date
mysql> select CURDATE(),CURRENT_DATE();
2. Get function of current time
CURTIME() : Used to get the current time of the system
Added by brighton on Thu, 14 May 2020 12:11:49 +0300
The main application scenario of redis multiple data sources is to use multiple redis servers or multiple redis libraries. In this paper, the fastdep dependency integration framework is used to quickly integrate redis multiple data sources and integrate lettuce connection pool. Only after introducing dependency, configure th ...
Added by hitman6003 on Wed, 13 May 2020 16:46:01 +0300
check constraint means to filter one or more columns according to certain preset rules. If the condition is true, the filtering succeeds; if the condition is false, the filtering fails and the failure code is returned to the client.
Why do you want to list and write this separately? You often encounter irregular SQL. In many cases, you can onl ...
Added by AndyB on Wed, 13 May 2020 12:25:22 +0300
Original address: https://mysqlserverteam.com/mysql-8-0-innodb-now-supports-instant-add-column/
For a long time, instant DDL has been one of the most popular InnoDB functions. For the growing and fast-growing data set, any network scale database must have the function of executing DDL immediately.
Developers often need to add new columns to m ...
Added by coolfool on Tue, 12 May 2020 16:55:02 +0300
Redis is an open source, network-enabled, memory-based and persistent log, Key-Value database written in the ANSI C language, and provides multilingual API s.
This article focuses on the main scenarios for using Redis with PHP.
Simple String Cache Actual
$strCacheKey = 'Test_bihu';
//SET Application ...
Added by chadbobb on Tue, 12 May 2020 09:51:38 +0300
Currently used user and host:
mysql> select USER();
| USER() |
| root@localhost |
1 row in set (0.00 sec)
Before mysql 5, you can directly use INSERT to INSERT mysql users into mysql tables. You can't do this after mysql 5
mysql> insert into mysql.user(Ho ...
Added by snap2000 on Mon, 11 May 2020 19:06:52 +0300
1, Create your own database
Download and install MySQL
1.windows Download: http://dev.mysql.com/downloads/mysql/
2. Open the server: enter the bin directory of the download path in the terminal (cmd), and execute mysqld -- initialize executor to start the server and initialize, but an error will be reported. The reason is that there is no data ...
Added by _giles_ on Mon, 11 May 2020 07:51:35 +0300
7, MySQL client tools and SQL introduction
mysql client command introduction;
How to get help from mysql;
Management database of DDL statements;
DDL statement management table and case introduction;
Data in management table of DML statement;
SELECT to retrieve data;
2. mysql interface program and SQL introduction
mysql client comma ...
Added by jdimino on Fri, 08 May 2020 16:47:04 +0300