Some problems in building springBoot to link mysql8

1. The database uses connection ssl

spring.datasource.url=jdbc:mysql://localhost:3306/user?characterEncoding=UTF-8&useSSL=false

Do not add the following information

Sun Mar 31 10:33:23 CST 2019 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
 

2. mysql time zone setting

The server time zone value 'Öйú±ê׼ʱ¼ä' is unrecognized or represents more than

Operation setting command
show variables like'%time_zone%';

set global time_zone='+8:00'

3、java.sql.SQLException: Unknown system variable 'query_cache_size'

I checked online because the version of mysql-connecter-java is too low. Obviously, the database driver does not correspond to the database version.

Solution:

For example, mybatis uses the mysql-5.1.14 driver, and the data source configured by mybatis is connected to mysql-8.0.11, just modify the pom file as follows:

<dependency>     <groupId>mysql</groupId>     <artifactId>mysql-connector-java</artifactId>     <version>8.0.11</version> </dependency>

 

According to the official statement:

The query cache is deprecated as of MySQL 5.7.20, and is removed in MySQL 8.0. Deprecation includes query_cache_size.

This means that the query cache is obsolete in MySQL 5.7.20, and it has been removed after MySQL 8.0.

I can change it to 8.0.11.