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iBatis异常问题处理

今天碰到个异常,异常内容为:IBatisNet.DataMapper.Exceptions.DataMapperException: SqlMap could not invoke BeginTransaction(). A Transaction is already started. Call CommitTransaction() or RollbackTransaction first.

反复查找资料,最后同事在官方论坛上看到类似问题。先来看问题代码:
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