ShardingSphere + MySQL implementation sub database
1, About ShardingSphere
ShardingSphere is an ecosystem composed of a set of open-source distributed database middleware solutions. It is composed of sharding JDBC, sharding proxy and sharding sidecar (planned). They all provide standardized data fragmentation, distributed transaction and data ...
Posted by frostyhorse on Mon, 22 Nov 2021 08:47:49 -0800
Welcome to pay attention
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Python practical quantitative transaction financial management system
1. Target scenario
Tiktok or Kwai Fu, and so on, once a video is on fire, many UP owners will scramble to imitate or sho ...
Posted by falian on Mon, 22 Nov 2021 04:30:55 -0800
1, How to set utf8mb4 up
For string types in mysql, charset can be set exactly to the field.
If only one field is set utf8mb4, other fields will not be affected.
If it is set for the table, the existing field will still be utf8, and there will be more utf8 tags, and then the created field will be utf8mb4.
If it is set for the library, the e ...
Posted by jibosh on Mon, 22 Nov 2021 04:24:55 -0800
This article focuses on the most commonly used query data SELECT statement in SQL language.
1. SELECT * FROM data_ table; --> from clause
FROM declares that the data source for retrieving data is the data table
SELECT keyword, followed by the column name to be retrieved, * represents all columns, and the number of column ...
Posted by elecktricity on Sun, 21 Nov 2021 12:04:25 -0800
Java cultivation program -- the 73rd day of learning punch in
Java (72nd day of punch in)
I've been busy with digital experiment recently. If you have any questions about verilog, please exchange and learn
First, simply query the previous content. Query the top 200 cities in the city table. After grouping according to the Countr ...
Posted by shergold on Sun, 21 Nov 2021 11:33:32 -0800
This blog is equipped with the learning video of Lao Du in station B to make learning records for later learning and review. It is not used for other purposes. Video link: https://www.bilibili.com/video/BV1Vy4y1z7EX?spm_id_from=pageDriver
Chapter 1 MySQL overview
DB: database, warehouse for storing dataDBMS: database managem ...
Posted by emma57573 on Sat, 20 Nov 2021 23:49:22 -0800
Why learn pandas
What is pandas
Basic operation of pandas
Common data types of pandas
Creation of pandas Series
Series Slicing and indexing of pandas
Reading external data from pandas
DataFrame of pandas
Row or column of pandas
loc of pandas
iloc of pandas
Boolean index of pandas
String method of pandas
Posted by Digwood on Sat, 20 Nov 2021 17:18:12 -0800
For code debugging, we can use any test code in the previous chapter as the Debug carrier. In this chapter, we actually study these two codes:
InputStream xml = Resources.getResourceAsStream("mybatis-config.xml");
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(xml);
That is, how to load the MyBatis global ...
1, Basic command line operations
mysql -u username - p password ；--- Connect to database
flush privileges ； Refresh permissions
show databases ； --- View all databases
mysql > use Database name--- Switch database
mysql> show tables ；--- Displays information for all tables in the database
MySQL > ...
Posted by jkohns on Sat, 20 Nov 2021 13:49:56 -0800
If there is a problem, switch the version:
What is MyBatis
MyBatis is an excellent persistence layer framework, which supports custom SQL, stored procedures and advanced mapping. MyBatis eliminates almost all JDBC code and the work of setting parameters and obtaining result ...
Posted by watts on Sat, 20 Nov 2021 13:06:01 -0800