请让我知道此异常的修复方法。在使用上面的 fetch API 时，我得到了上面提到的异常。我使用的数据库是mysql。我已将 java Enumeration 映射到 mysql 的 varchar 并且它正在正确插入行。但是在从 db 获取值时，它给出了上述异常。我认为它无法将 mysql varchar 映射到 java 枚举。
例外：
ERROR: Unknown column 'FOLDER' in 'where clause'
org.hibernate.exception.SQLGrammarException: Unknown column 'FOLDER' in 'where clause'
at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:82)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:125)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:110)
at org.hibernate.engine.jdbc.internal.proxy.AbstractStatementProxyHandler.continueInvocation(AbstractStatementProxyHandler.java:129)
at org.hibernate.engine.jdbc.internal.proxy.AbstractProxyHandler.invoke(AbstractProxyHandler.java:81)
at $Proxy5.executeQuery(Unknown Source)
at org.hibernate.loader.Loader.getResultSet(Loader.java:2031)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1832)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1811)
at org.hibernate.loader.Loader.doQuery(Loader.java:899)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:341)
at org.hibernate.loader.Loader.doList(Loader.java:2516)
at org.hibernate.loader.Loader.doList(Loader.java:2502)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2332)
at org.hibernate.loader.Loader.list(Loader.java:2327)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:490)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:355)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:195)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1247)
at org.hibernate.internal.QueryImpl.list(QueryImpl.java:101)
at doa.ActionDetailsDOA.fetchActionDetailsByCircleIdProfileIdElementTypeAndactionId(ActionDetailsDOA.java:24)
at doa.ActionDetailsDOA.main(ActionDetailsDOA.java:41)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'FOLDER' in 'where clause'
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
at com.mysql.jdbc.Util.getInstance(Util.java:381)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1030)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3491)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3423)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1936)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2060)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2542)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1734)
at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1885)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.hibernate.engine.jdbc.internal.proxy.AbstractStatementProxyHandler.continueInvocation(AbstractStatementProxyHandler.java:122)
... 18 more
数据模型示例是：
public class ActionDetails implements java.io.Serializable {
private static final long serialVersionUID = 1L;
private AId id; // containing composite primary key
private int parentId;
}
public class AId implements Serializable{
private int fldCircleId;
private int fldProfileId;
private ElementType elementType;
}
class Folder extends ActionDetails {
// contains attributes provided in ActionDetails.hbm.xml
}
class Item extends ActionDetails {
// contains attributes provided in ActionDetails.hbm.xml
}
ActionDetails.hbm.xml 示例：
<hibernate-mapping>
<class name="model.ActionDetails" table="action_details">
<composite-id name="id" class="model.ActionDetailsId">
<key-property name="fldCircleId" type="int">
<column name="fld_circle_id" />
</key-property>
<key-property name="fldProfileId" type="int">
<column name="fld_profile_id" />
</key-property>
<key-property name="elementType">
<column name="element_type" length="7" />
<type name="org.hibernate.type.EnumType">
<param name="enumClass">model.ElementType</param>
<param name="type">12</param> <!-- 12 corresponds to java.sql.Types.VARCHAR -->
</type>
</key-property>
</composite-id>
<discriminator column="element_type" insert="false"/>
<property name="parentId" type="int">
<column name="parent_id" not-null="true" />
</property>
<property name="elementIndex" type="int">
<column name="element_index" not-null="true" />
</property>
<property name="level" type="int">
<column name="level" not-null="true" />
</property>
<property name="oldActionId" type="java.lang.Integer">
<column name="old_action_id" />
</property>
<property name="elementDetails" type="string">
<column name="element_details" length="1000" />
</property>
<set name="menuHighestActionIds" table="menu_highest_action_id" inverse="true" lazy="true" fetch="select">
<key>
<column name="fld_circle_id" not-null="true" />
<column name="fld_profile_id" not-null="true" />
<column name="element_type" length="7" not-null="true" />
<column name="highest_action_id" not-null="true" />
</key>
<one-to-many class="model.MenuHighestActionId" />
</set>
<!-- Attributes of Folder.java -->
<subclass name="model.Folder" discriminator-value="FOLDER">
<property name="folderId" type="java.lang.Integer">
<column name="folder_id" />
</property>
<property name="title" type="string">
<column name="title" length="20" />
</property>
</subclass>
<!-- Attributes of Item.java -->
<subclass name="model.Item" discriminator-value="ITEM">
<property name="softId" type="java.lang.Integer">
<column name="softid" />
</property>
<property name="title" type="string">
<column name="title" length="20" />
</property>
<property name="description" type="string">
<column name="description" length="50" />
</property>
<property name="subscriptionInfo">
<column name="subscriptioninfo" length="35" />
<type name="org.hibernate.type.EnumType">
<param name="enumClass">model.SubscriptionInfo</param>
<param name="type">12</param><!-- 12 corresponds to java.sql.Types.VARCHAR -->
</type>
</property>
<property name="commandType">
<column name="commandtype" length="13" />
<type name="org.hibernate.type.EnumType">
<param name="enumClass">model.CommandType</param>
<param name="type">12</param> <!-- 12 corresponds to java.sql.Types.VARCHAR -->
</type>
</property>
<property name="keyword" type="string">
<column name="keyword" length="10" />
</property>
<property name="shortcode" type="java.lang.Integer">
<column name="shortcode" />
</property>
</subclass>
</class>
</hibernate-mapping>
示例 od ActionDetailsDOA.java ：
public List<ActionDetails> fetchActionDetailsByCircleIdProfileIdElementTypeAndactionId(int circleId, int profileId, ElementType elementType, int actionId) throws Exception{
try{
hibSession = HibernateUtil.getSessionFactory().openSession();
tx = hibSession.beginTransaction();
Query query = hibSession.createQuery("from ActionDetails as ad where ad.id.fldCircleId="+circleId+" and ad.id.fldProfileId="+profileId+" and ad.id.elementType="+elementType+" and ad.id.actionId="+actionId);
List list = query.list();
System.out.println(list);
tx.commit();
return null;
}catch(Exception exception){
tx.rollback();
throw exception;
}finally{
if(hibSession != null){
hibSession.close();
}
}
}