ORA-00907: 缺失右括号（通用解决办法）

PL/SQL 的SQL语句可以执行，但是放在hibernate中，后台打印，出现了错误。

错误的SQL解析：黄色为错误部分

Hibernate: 

    select

        examinee0_.EXAM_YEAR as col_0_0_,

        count(*) as col_1_0_,

        sum(caseexaminee0_.CHECK_FLAGwhen'2'then1else 0end) as col_2_0_

     from

        vet_test.EXAMINEE examinee0_ 

    group by

        examinee0_.EXAM_YEAR 

    order by

        examinee0_.EXAM_YEAR ASC

很明显 ，标黄的地方出错，空格不翼而飞，后台提示ORA-00907: 缺失右括号

经过一番检查！终于发现了问题所在:那就是hibernate的SQL查询翻译器！

Hibernate3.0 采用新的基于ANTLR的HQL/SQL查询翻译器，     
     在hibernate的配置文件中，hibernate.query.factory_class     
     属性用来选择查询翻译器。     
     （1）选择Hibernate3.0的查询翻译器：     
     hibernate.query.factory_class=     
     org.hibernate.hql.ast.ASTQueryTranslatorFactory     
     （2）选择Hibernate2.1的查询翻译器hibernate.query.factory_class=     
     org.hibernate.hql.classic.ClassicQueryTranslatorFactory

解决方案：

将hibernate.cfg.xml的

<property name="hibernate.query.factory_class">

org.hibernate.hql.classic.ClassicQueryTranslatorFactory

</property>

标蓝色的部分替换成org.hibernate.hql.ast.ASTQueryTranslatorFactory

替换后后台打印解析后的sql：黄色为解析正确后的sql

Hibernate:

select

examinee0_.EXAM_YEAR as col_0_0_,

count(*) as col_1_0_,

sum(case examinee0_.CHECK_FLAG

when '2' then 1

else 0

end) as col_2_0_

from

vet_test.EXAMINEE examinee0_

group by

examinee0_.EXAM_YEAR

order by

examinee0_.EXAM_YEAR ASC