https://blog.csdn.net/WJ_toy/article/details/84678914
https://www.cnblogs.com/xingyunblog/p/6243179.html
在jdbc连接中加一句话:useAffectedRows=true
MyBatis发现更新和插入返回值一直为"-2147482646"的错误是由defaultExecutorType设置引起的,如果设置为BATCH,更新返回值就会丢失。mybatis官方的讨论列表,这句很关键:“If the BATCH
executor is in use, the update counts are being lost. ”
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