DataIntegrityViolationException (Spring Framework 5.3.21 API)
Exception thrown when an attempt to insert or update data results in violation of an integrity constraint. Note that this is not purely a relational concept; unique primary keys are required by most database types.
插入或者更新数据的时候违反了唯一性约束。 主要不是单纯的关系概念；唯一主键是大多数数据库类型所需的。
可能的问题常见问题分析：
- integer out of range 数据越界可能造成这种报错
- 主键重复
- 字段长度超出约束值(字段过长)
- 字段有非空约束
org.springframework.dao.DataIntegrityViolationException:
### Error updating database. Cause: org.postgresql.util.PSQLException: ERROR: integer out of range
org.springframework.dao.DataIntegrityViolationException:
### Error updating database. Cause: org.postgresql.util.PSQLException: ERROR: value too long for type character varying(20)org.springframework.dao.DataIntegrityViolationException:
### Error updating database. Cause: org.postgresql.util.PSQLException: ERROR: integer out of range
org.springframework.dao.DataIntegrityViolationException:
### Error updating database. Cause: org.postgresql.util.PSQLException: ERROR: value too long for type character varying(20)