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我在使用 Hibernate 时遇到问题：

我有一个到数据库的连接，并生成了用于执行 HQL 查询的类和 hmb.xml 文件。但是，当我打字时：

from Department

并且Show SQL参数设置为true，我可以看到涉及的 SQL 查询：

select from

但我不明白查询的另一部分在哪里。

我不知道，但也许这是运行查询后出错的原因：

org.hibernate.exception.SQLGrammarException: could not execute query
    at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:92)
    at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
    at org.hibernate.loader.Loader.doList(Loader.java:2545)
    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2276)
    at org.hibernate.loader.Loader.list(Loader.java:2271)
    at org.hibernate.hql.classic.QueryTranslatorImpl.list(QueryTranslatorImpl.java:940)
    at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)
    at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1268)
    at org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)
Caused by: java.sql.SQLSyntaxErrorException: ORA-00936: missing expression

    at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:447)
    at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:396)
    at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:951)
    at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:513)
    at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:227)
    at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:531)
    at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:208)
    at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:886)
    at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1175)
    at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1296)
    at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3613)
    at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3657)
    at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeQuery(OraclePreparedStatementWrapper.java:1495)
    at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:208)
    at org.hibernate.loader.Loader.getResultSet(Loader.java:1953)
    at org.hibernate.loader.Loader.doQuery(Loader.java:802)
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:274)
    at org.hibernate.loader.Loader.doList(Loader.java:2542)
    ... 8 more

配置文件是这样的：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
  <session-factory>
    <property name="hibernate.dialect">org.hibernate.dialect.OracleDialect</property>
    <property name="hibernate.connection.driver_class">oracle.jdbc.OracleDriver</property>
    <property name="hibernate.connection.url">jdbc:oracle:thin:@localhost:1521:XE</property>
    <property name="hibernate.connection.username">admin</property>
    <property name="hibernate.connection.password">admin</property>
    <property name="hibernate.show_sql">true</property>
    <property name="hibernate.current_session_context_class">thread</property>
    <property name="hibernate.query.factory_class">org.hibernate.hql.classic.ClassicQueryTranslatorFactory</property>
    <mapping resource="catalog/Coworker.hbm.xml"/>
    <mapping resource="catalog/Unit.hbm.xml"/>
    <mapping resource="catalog/Department.hbm.xml"/>
    <mapping resource="catalog/Post.hbm.xml"/>
  </session-factory>
</hibernate-configuration>

文件内容hbm.xml：

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<!-- Generated Nov 26, 2013 3:51:26 PM by Hibernate Tools 3.6.0 -->
<hibernate-mapping>
    <class name="catalog.Department" table="DEPARTMENT" schema="ADMIN">
        <id name="idDepartment" type="big_decimal">
            <column name="ID_DEPARTMENT" precision="22" scale="0" />
            <generator class="assigned" />
        </id>
        <many-to-one name="department" class="catalog.Department" fetch="select">
            <column name="PARENT_ID" precision="22" scale="0" not-null="true" />
        </many-to-one>
        <property name="nameDepartment" type="string">
            <column name="NAME_DEPARTMENT" length="40" not-null="true" />
        </property>
        <set name="posts" table="POST" inverse="true" lazy="true" fetch="select">
            <key>
                <column name="ID_DEPARTMENT" precision="22" scale="0" not-null="true" />
            </key>
            <one-to-many class="catalog.Post" />
        </set>
        <set name="departments" table="DEPARTMENT" inverse="true" lazy="true" fetch="select">
            <key>
                <column name="PARENT_ID" precision="22" scale="0" not-null="true" />
            </key>
            <one-to-many class="catalog.Department" />
        </set>
    </class>
</hibernate-mapping>

请帮助我进入 Hibernate 学习的下一部分！

4

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