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位置：test_pymysql_opengauss.py:L493-L498
【问题】
重复键场景把 DROP TABLE、CREATE TABLE、第一次正常 INSERT 和真正应触发重复键的第二次 INSERT 放在同一个 try 中。若建表失败、权限不足或第一次 INSERT 失败，也会落入 L508 的通用异常分支并加入 xfail_reasons；runner 最终只统计 XFAIL、仍返回退出码 0，因此测试可能根本没有执行重复键 SQL却显示流水成功。
【建议】
先在异常断言之外完成 DROP/CREATE/第一次 INSERT 并提交，再用单独 try 只包住第二次重复键 INSERT；仅将已确认的错误映射差异认定为 XFAIL，准备阶段或连接类异常直接作为 FAIL 抛出。
【标题】
PyMySQL 1.2.0 兼容 openGauss 7.0.0-RC3 B兼容数据库（dolphin插件）兼容性测试
【实现内容】:
提交 PyMySQL 兼容性测试套件及自测报告，包含：
【根因分析】:
PyMySQL 通过 dolphin 插件 MySQL 协议端口连接 openGauss 时存在协议兼容性问题，
本测试验证修复后的兼容性现状。
【实现方案】:
基于 PyMySQL 1.2.0 + openGauss 7.0.0-RC3 + dolphin 插件，
在 B 兼容数据库上运行 18 项兼容性测试。
【关联需求或issue】:
2025 开源之夏课题：PyMySQL 兼容 openGauss B兼容数据库
【开发自验报告】:
4-8. 不涉及
【当前PR是否有AI参与】:
[x] 否