April 2021 - Simon Technology Blog

MySql AUTO INCREMENT Field

If you accidentally lose the primary key and need to modify the id column of the table as the primary key, you can use the following SQL statement

April 25, 2021By Simo Mysql Alter auto-increment primary key, AUTO_INCREMENT PRIMARY KEY, modify id as primary key, MySql AUTO INCREMENT

JSTL format timestamp

JSTL format timestamp, for example, how can 1444226313 be displayed as 2015/10/7 21:58:33?

April 20, 2021By Simo Jsp fmt:formatDate, jstl timestamp

How to solve tomcat exception error:Invalid character found in the request target

How to solve tomcat exception error:
java.lang.IllegalArgumentException: Invalid character found in the request target. The valid characters are defined in RFC 7230 and RFC 3986

April 15, 2021By Simo Java IllegalArgumentException, Invalid character, RFC 7230 and RFC 3986, tomcat error

Distributed system unique id generation algorithm Twitter Snowflake

In a distributed system, how to solve the unique sequence problem, how to solve the duplication id problem, there are currently many algorithms can be solved, today we introduce a classic solution: Twitter SnowFlake

April 11, 2021By Simo Java Distributed system, duplication id, Snow flakeId, SnowFlake algorithm, unique sequence, unique sequence idLeave a Comment