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我使用的是標準API試圖SUBSTR對Hibernate的查詢：SUBSTR錯誤：org.hibernate.exception.GenericJDBCException：無法執行查詢
Type[] type = {Hibernate.INTEGER,Hibernate.INTEGER};
Criteria criteria = session.createCriteria(Dept.class).setProjection(Projections.projectionList().add(Projections.sqlProjection("substr(DEPT_NAME,1,3) as name", new String[]{"name"}, type)));
List<String> list1 = criteria.list();
但我得到異常：
org.hibernate.exception.GenericJDBCException: could not execute query
at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103)
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.loader.Loader.doList(Loader.java:2223)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104)
at org.hibernate.loader.Loader.list(Loader.java:2099)
at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:94)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1569)
at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:283)
at com.infy.jdbc.HibernateStartup.main(HibernateStartup.java:196)
Caused by: java.sql.SQLException: Fail to convert to internal representation
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:111)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:145)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:207)
at oracle.jdbc.driver.CharCommonAccessor.getInt(CharCommonAccessor.java:131)
at oracle.jdbc.driver.OracleResultSetImpl.getInt(OracleResultSetImpl.java:520)
at oracle.jdbc.driver.OracleResultSet.getInt(OracleResultSet.java:1562)
at org.hibernate.type.IntegerType.get(IntegerType.java:28)
at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:163)
at org.hibernate.type.NullableType.nullSafeGet(NullableType.java:189)
at org.hibernate.loader.criteria.CriteriaLoader.getResultColumnOrRow(CriteriaLoader.java:107)
at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:606)
at org.hibernate.loader.Loader.doQuery(Loader.java:701)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.doList(Loader.java:2220)
... 6 more
SQL查詢得到印刷在控制檯是：
Hibernate: select substr(DEPT_NAME,1,3) as name from dept this_
當我在我的數據庫中執行此操作時，它工作正常。
請讓我知道這個例外的原因。
問候，