Oracle中char类型字段在Hibernate中SQL查询只返回一个字符 解决方法
场景如下：
使用char(2)的类型来标识某个类型，比如01，02，03...
结果使用Hibernate的SQL查询该字段只返回0，0，0...
跟踪发现，char类型映射出Java对象是Character，说明char在Java中只有两个字节（一个字符），因此只返回0
解决方法：
通过限定他的返回类型为String就行了，如下：
SQLQuery query = session.createSQLQuery(sql);
query.addScalar("列名",Hibernate.STRING);
即可解决.不过会导致对所查询的字段都要加上addScalar.
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