在網上找了搜了一下，沒有解決，最后突然想到把MySQL中表的編碼改為utf-8 就好了
實用SQLyog工具 -> 改變表
org.springframework.orm.jpa.JpaSystemException: could not execute statement; nested exception is org
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nested exception is org.springframework.orm.jpa.JpaSystemException: Null value was assigned to a property的解決辦法
報錯：org.springframework.dao.InvalidDataAccessResourceUsageException: could not execute statement; SQL [n/a]; nested exception is org.hibernate.exception.SQLGrammarException: could not execute statement
【hibernate】報錯：org.springframework.dao.DataIntegrityViolationException: could not execute statement; SQL [n/a]; nested exception is org.hibernate.exception.DataException: could not execute statement
org.springframework.dao.DataIntegrityViolationException: could not execute statement; SQL [n/a]; constraint [null]; nested exception is org.hibernate.
org.springframework.dao.InvalidDataAccessResourceUsageException: could not execute query; nested exception is
HTTP Status 500 - Request processing failed; nested exception is org.hibernate.exception.GenericJDBCException: could not execute statement
could not execute statement； SQL [n/a]； nested exception is org.hibernate.exception.DataException:
SpringBoot保存數據報錯：could not execute statement; SQL [n/a]; constraint [PRIMARY];nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement
org.hibernate.exception.GenericJDBCException: could not execute statement
Java EE 之 Hibernate異常總結【4】org.hibernate.exception.SQLGrammarException: could not execute statement