https://mangkyu.tistory.com/97
https://www.tutorialspoint.com/mybatis/mybatis_read_operation.htm https://www.tutorialspoint.com/mybatis/mybatis_update_operation.htm
https://www.tutorialspoint.com/springjdbc/springjdbc_read_query.htm https://www.tutorialspoint.com/springjdbc/springjdbc_update_query.htm
https://jinhokwon.github.io/mysql/mysql-select-for-update/
jdbc:mariadb:replication://db1:1307,db2:1307/blue?useUnicode=true&autoReconnect=true&serverTimezone=UTC&sessionVariables=character_set_client=utf8mb4,character_set_connection=utf8mb4,character_set_results=utf8mb4,collation_connection=utf8mb4_general_cihttps://www.baeldung.com/cassandra-keys
PrimaryKeyType.CLUSTERED
Used for a column that is clustered key.
PrimaryKeyType.PARTITIONED
Used for a column that is part of the partition key.