Hibernate：JDBC 类型没有方言映射：101

Question

我在从数据库中选择记录时遇到问题，

查询：

 SELECT rownum as id, mm.metric_name, dm.aggregated_value_float,
 dm.created_timestamp, s.type, s.name as subelement_name FROM
 daily_metric dm, subelement s, metric_metadata mm  WHERE
 dm.subelement_id =s.subelement_id AND 
 TRUNC(dm.created_timestamp)='15-JAN-15' AND s.subelement_id =1456376 
 and dm.metric_metadata_id = mm.metric_metadata_id order by 1,2 desc

代码：

Query query = session.createSQLQuery(query);
Object o =  query.uniqueResult();

堆栈跟踪

org.hibernate.MappingException: No Dialect mapping for JDBC type: 101
    at org.hibernate.dialect.TypeNames.get(TypeNames.java:87)
    at org.hibernate.dialect.TypeNames.get(TypeNames.java:118)
    at org.hibernate.dialect.Dialect.getHibernateTypeName(Dialect.java:653)
    at org.hibernate.loader.custom.JdbcResultMetadata.getHibernateType(JdbcResultMetadata.java:93)
    at org.hibernate.loader.custom.ScalarResultColumnProcessor.performDiscovery(ScalarResultColumnProcessor.java:62)
    at org.hibernate.loader.custom.CustomLoader.autoDiscoverTypes(CustomLoader.java:496)
    at org.hibernate.loader.Loader.getResultSet(Loader.java:2073)
    at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1862)
    at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1838)
    at org.hibernate.loader.Loader.doQuery(Loader.java:909)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:354)
    at org.hibernate.loader.Loader.doList(Loader.java:2551)
    at org.hibernate.loader.Loader.doList(Loader.java:2537)
    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2367)
    at org.hibernate.loader.Loader.list(Loader.java:2362)
    at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:351)
    at org.hibernate.internal.SessionImpl.listCustomQuery(SessionImpl.java:1869)
    at org.hibernate.internal.AbstractSessionImpl.list(AbstractSessionImpl.java:311)
    at org.hibernate.internal.SQLQueryImpl.list(SQLQueryImpl.java:141)
    at org.hibernate.internal.AbstractQueryImpl.uniqueResult(AbstractQueryImpl.java:966)

我试过 link 但它显示 Hibernate.Timestamp 编译器无法解决。

hibernate.cfg.xml

 <property name="dialect">org.hibernate.dialect.Oracle10gDialect</property>
  <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>

Answer 1

这样试试：

Object result = session.createSQLQuery(
        "SELECT " +
        "   rownum as id, " +
        "   mm.metric_name, " +
        "   dm.aggregated_value_float, " +
        "   dm.created_timestamp as dm_timestamp, " +
        "   s.type, " +
        "   s.name as subelement_name " +
        "FROM " +
        "   daily_metric dm, " +
        "   subelement s, " +
        "   metric_metadata mm " +
        "WHERE " +
        "   dm.subelement_id =s.subelement_id AND " +
        "   TRUNC(dm.created_timestamp)='15-JAN-15' AND " +
        "   s.subelement_id =1456376 AND " +
        "   dm.metric_metadata_id = mm.metric_metadata_id " +
        "ORDER BY 1,2 DESC")
.addScalar("dm_timestamp", TimestampType.INSTANCE)
.uniqueResult();

Answer 2

当 select 通过 "getSingleResult()" 从 table 获取单个结果时，我遇到了类似的问题：

 BigDecimal result = (BigDecimal)query.getSingleResult();

事实证明，我必须将 select 语句中返回的数字显式转换为数字：

 SELECT CAST(SUM(aggregated) as NUMBER) FROM ....

Hibernate：JDBC 类型没有方言映射：101

Hibernate : No Dialect mapping for JDBC type: 101

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