0

JPAを使用してOracleXMLType列からデータを取得しています。カスタマイザーを作成しました：

@Override
public void customize(final ClassDescriptor descriptor) throws Exception {
    descriptor.removeMappingForAttributeName("content");
    DirectToXMLTypeMapping mapping = new DirectToXMLTypeMapping();
    mapping.setAttributeName("content"); //name of the atribute on the Entity Bean
    mapping.setFieldName("CONTENT"); //name of the data base column
    mapping.getField().setColumnDefinition("XMLTYPE");
    descriptor.addMapping(mapping);
}

私のエンティティクラスの列は次のとおりです。

@Basic(optional = false)
@NotNull
@Lob
//@Column(name = "CONTENT", columnDefinition="XMLTYPE")    
private String content;

ただし、プログラムを実行すると、java.lang.ClassCastException: oracle.xdb.XMLType cannot be cast to java.lang.String at entities.Sqdocument._persistence_set(Sqdocument.java) at org.eclipse.persistence.internal.descriptors.PersistenceObjectAttributeAccessor.setAttributeValueInObject(PersistenceObjectAttributeAccessor.java:46) at org.eclipse.persistence.mappings.DatabaseMapping.setAttributeValueInObject(DatabaseMapping.java:1532) at org.eclipse.persistence.mappings.DatabaseMapping.readFromRowIntoObject(DatabaseMapping.java:1423) at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildAttributesIntoObject(ObjectBuilder.java:448) at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:803) at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:607) at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:564) at org.eclipse.persistence.queries.ObjectLevelReadQuery.buildObject(ObjectLevelReadQuery.java:777) at org.eclipse.persistence.queries.ReadObjectQuery.executeObjectLevelReadQuery(ReadObjectQuery.java:462) at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:1150) at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:852) at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1109) at org.eclipse.persistence.queries.ReadObjectQuery.execute(ReadObjectQuery.java:421) at org.eclipse.persistence.internal.sessions.AbstractSession.internalExecuteQuery(AbstractSession.java:2946) at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1602) at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1584) at org.eclipse.persistence.internal.indirection.NoIndirectionPolicy.valueFromQuery(NoIndirectionPolicy.java:323) at org.eclipse.persistence.mappings.ForeignReferenceMapping.valueFromRowInternal(ForeignReferenceMapping.java:2135) at org.eclipse.persistence.mappings.OneToOneMapping.valueFromRowInternal(OneToOneMapping.java:1716) at org.eclipse.persistence.mappings.ForeignReferenceMapping.valueFromRow(ForeignReferenceMapping.java:2024) at org.eclipse.persistence.mappings.ForeignReferenceMapping.readFromRowIntoObject(ForeignReferenceMapping.java:1369) at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildAttributesIntoObject(ObjectBuilder.java:448) at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:803) at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildWorkingCopyCloneNormally(ObjectBuilder.java:719) at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObjectInUnitOfWork(ObjectBuilder.java:672) at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:605) at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:564) at org.eclipse.persistence.queries.ObjectLevelReadQuery.buildObject(ObjectLevelReadQuery.java:777) at org.eclipse.persistence.queries.ReadAllQuery.registerResultInUnitOfWork(ReadAllQuery.java:783) at org.eclipse.persistence.queries.ReadAllQuery.executeObjectLevelReadQuery(ReadAllQuery.java:434) at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:1150) at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:852) at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1109) at org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:393) 「何が問題なのか」というエラーが表示されます。ありがとう。

4

1 に答える 1

0

EclipselinkはXMLタイプを正常に取得しています。問題は、XMLTypeがStringのインスタンスではないため、自動的に変換できないことです。

XMLTypeとStringの間で変換するConverterを作成する必要があります。データを何らかの方法で変更したい場合は、StringからXMLTypeに移行するコンバーターの反対側も作成する必要があります。

コンバーターの作成については、コンバージョンとコンバーターをご覧ください。

于 2013-03-15T16:54:10.530 に答える