mybatis 批量處理時自動提交的問題

Spring 中默認的事務工廠 SpringTransactionFactory 時每次執行 flushStatements() 方法後事務會立即提交，代碼中的 SqlSession.commit(), SqlSession.rollback() or SqlSession.close() 不能影響 Spring 管理的SqlSession，不管 autocommit 怎麼設置，在 Spring 事務外面執行 SqlSession 的任何數據操作或者調用 mapper 中的方法都會立即提交[參見資料2]。

MyBatis SqlSession provides you with specific methods to handle transactions programmatically. But when using MyBatis-Spring your beans will be injected with a Spring managed SqlSession or a Spring managed mapper. That means that Spring will always handle your transactions.

You cannot call SqlSession.commit(), SqlSession.rollback() or SqlSession.close() over a Spring managed SqlSession. If you try to do so, a UnsupportedOperationException exception will be thrown. Note these methods are not exposed in injected mapper classes.

Regardless of your JDBC connection's autocommit setting, any execution of a SqlSession data method or any call to a mapper method outside a Spring transaction will be automatically committed.

解決辦法：使用 JDBC 事務工廠

<bean id="transactionFactory" class="org.apache.ibatis.transaction.jdbc.JdbcTransactionFactory" />
<bean id="sqlSessionFactory2" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="configLocation" value="config/mybatis-config-spring.xml" />
    <property name="dataSource" ref="dataSource" />
    <property name="transactionFactory" ref="transactionFactory" />
</bean>

參考資料
1. SpringManagedTransactionFactory always ignore autoCommit. https://github.com/mybatis/spring/issues/39
2. mybatis-spring Transactions. http://www.mybatis.org/spring/transactions.html
3. mybatis Java API（中文版）. http://www.mybatis.org/mybatis-3/zh/java-api.html
4. mybatis Java API. http://www.mybatis.org/mybatis-3/java-api.html
5. mybatis Configuration. http://www.mybatis.org/mybatis-3/configuration.html
6. mybatis全局配置文件mybatis-config.xml. https://www.jianshu.com/p/2756e81d02ff
7. 談jdbcTemplate與mybatis. https://www.cnblogs.com/ChenD/p/7080934.html