本文深入探讨了SQLite在处理对象持久化时遇到的约束违规问题，包括主键重复和其他约束违反情况，如非空字段被设置为NULL。当这些错误发生时，SQLite对象数据库运行时会统一抛出object_already_persistent异常。
Due to the granularity of the SQLite error codes, it is impossible to distinguish between the
duplicate primary key and other constraint violations. As a result, when making an object
persistent, the SQLite ODB runtime will translate all constraint violation errors to the
object_already_persistent exception (Section 3.14, "ODB Exceptions").
1. duplicate primary key
2. other constraint violations(for example: not null section set to null)
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