java JPA ORM。<mappedsuperclass>中的xml映射文件不能将<basic>放在一起<id>或<version>

Question

我有很多带有JPA注释的类，我需要将其更改为orm mappingfile

但是，XML中有一个奇怪的错误

我的XML

<?xml version="1.0" encoding="UTF-8"?>
 <entity-mappings version="2.1"
xmlns="http://xmlns.jcp.org/xml/ns/persistence/orm"   
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence/orm 
                    http://xmlns.jcp.org/xml/ns/persistence/orm_2_1.xsd">


<mapped-superclass class="model.base.BaseModel">
    <entity-listeners>
        <entity-listener class="model.base.BaseModelListener"></entity-listener>
    </entity-listeners>

    <attributes>


        <id name="id">
            <generated-value strategy="IDENTITY" />
        </id>

        <version name="version"></version>

        <basic name="createdAt" optional="false">
            <column name="updated_at" nullable="false" />
            <temporal>TIMESTAMP</temporal>
        </basic>

        <basic name="updatedAt" optional="false">
            <column name="updated_at" nullable="false" />
            <temporal>TIMESTAMP</temporal>
        </basic>

    </attributes>

</mapped-superclass>


<entity class="model.general.Account">
    <attributes>            
        <basic name="email">
        </basic>
    </attributes>
</entity>

如果有<；id>；标记或<；版本>；一起标记<；基础>；显示错误：

 cvc-complex-type.2.4.a: Invalid content was found starting with element 'basic'. One of              {"xmlns.jcp.org/xml/ns/persistence/orm":version "http://xmlns.jcp.org/xml/ns/persistence/orm":many- to-one, http://xmlns.jcp.org/xml/ns/persistence/orm":one-to-many, "    http://xmlns.jcp.org/xml/ns/
         persistence/orm":one-to-one, "http://xmlns.jcp.org/xml/ns/persistence/orm":many-to-many,  "http:// xmlns.jcp.org/xml/ns/persistence/orm":element-collection,    "http://xmlns.jcp.org/xml/ns/persistence/ orm":embedded, http://xmlns.jcp.org/xml/ns/persistence/orm":transient}' is expected.

怎么了？ 我可以在中的超类中定义atribute吗。xml是否在模型类中定义并带有注释？T

带注释的类是没有问题的作品，是否有任何限制使用。xml而不是注释

Answer 1

元素version应该在basic元素最后一次出现之后立即出现，而不是像现在这样出现在它们之前

在这种情况下，正确的顺序是：

    <id name="id">
        <generated-value strategy="IDENTITY" />
    </id>

    <basic name="createdAt" optional="false">
        <column name="updated_at" nullable="false" />
        <temporal>TIMESTAMP</temporal>
    </basic>

    <basic name="updatedAt" optional="false">
        <column name="updated_at" nullable="false" />
        <temporal>TIMESTAMP</temporal>
    </basic>

    <version name="version"></version>

作为补充说明，更新的_at列似乎映射了两次

attributes元素下的元素顺序在schema中定义：

<xsd:sequence>
  ....
  <xsd:choice>
    <xsd:element name="id" type="orm:id" 
                 minOccurs="0" maxOccurs="unbounded"/>
    <xsd:element name="embedded-id" type="orm:embedded-id" 
                 minOccurs="0"/>
  </xsd:choice>
  <xsd:element name="basic" type="orm:basic"
               minOccurs="0" maxOccurs="unbounded"/>
  <xsd:element name="version" type="orm:version"
               minOccurs="0" maxOccurs="unbounded"/>
  <xsd:element name="many-to-one" type="orm:many-to-one"
               minOccurs="0" maxOccurs="unbounded"/>
....
</xsd:sequence>