Question

我是JPA的新手。背景：

IDE：安装了NB Springboot插件的Netbeans 8.2。
JAVA 8
Spring boot 1.5.6

我想要实现的是混合JPA注释和ORM（用于那些复杂的本机查询）。拥有下一个资源：

的persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
    <persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
      <persistence-unit name="com.nexti_dragonstone-console_war_0.0.1PU" transaction-type="RESOURCE_LOCAL">
        <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
        <class>com.nexti.dragonstone.entity.DgMobile</class>
        <class>com.nexti.dragonstone.entity.DgMobileControl</class>
        <exclude-unlisted-classes>false</exclude-unlisted-classes>
        <mapping-file>META-INF/orm.xml</mapping-file>
        <properties>
          <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/dragonglass?zeroDateTimeBehavior=convertToNull"/>
          <property name="javax.persistence.jdbc.user" value="root"/>
          <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
          <property name="javax.persistence.jdbc.password" value="root"/>
        </properties>
      </persistence-unit>
    </persistence>

META-INF / orm.xml

 <?xml version="1.0" encoding="UTF-8"?>
<entity-mappings xmlns="http://java.sun.com/xml/ns/persistence/orm" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence/orm http://java.sun.com/xml/ns/persistence/orm_2_0.xsd" version="2.0">
    <description>Extracted queries for DgMobile repository</description>

    <!-- using JPQL query -->
    <named-query name="DgMobile.findWhereVersionLessThan">
        <query><![CDATA[
            SELECT m FROM DgMobile m WHERE m.version < :version
        ]]></query>
    </named-query>

    <!-- using Native SQL query -->
    <named-native-query name="DgMobile.findWhereVersionGreaterThan" 
        result-class="com.nexti.dragonstone.entity.DgMobile">
        <query><![CDATA[
            SELECT * FROM dg_mobile WHERE version > :version
        ]]></query>
    </named-native-query>

</entity-mappings>

DgMobile.java（实体）

@Entity
@Table(name = "dg_mobile")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "DgMobile.findAll", query = "SELECT d FROM DgMobile d")
    , @NamedQuery(name = "DgMobile.findByIdMobile", query = "SELECT d FROM DgMobile d WHERE d.idMobile = :idMobile")
    , @NamedQuery(name = "DgMobile.findByImei", query = "SELECT d FROM DgMobile d WHERE d.imei = :imei")
    , @NamedQuery(name = "DgMobile.findWhereVersionLessThan", query="SELECT m FROM DgMobile m WHERE m.version < :version")
})
@NamedNativeQueries({

})
public class DgMobile implements Serializable {

    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "id_mobile", nullable = false)
    private Integer idMobile;
    @Basic(optional = false)
    @NotNull
    @Size(min = 1, max = 25)
    @Column(nullable = false, length = 25)
    private String imei;
...

DgMobileRepository

@RepositoryRestResource
public interface DgMobileRepository extends JpaRepository<DgMobile, Integer> {

    //single JPA-JPQL query implementation
    DgMobile findByIdMobile(@Param("id") int idMobile);

    //single JPA-JPQL query implementation with custom param names
    DgMobile findByImei(@Param("imei") String imei );

    //JPA-JPQL implementation for complex or native queries (using an XML file)
    @Query(nativeQuery = false, name = "DgMobile.findWhereVersionLessThan")
    List<DgMobile> findWhereVersionLessThan(@Param("version") int version);

    //JPA-SQL implementation for complex or native queries (using an XML file)
    // with custom param and method names
    @Query(nativeQuery = true, name = "DgMobile.findWhereVersionGreaterThan")
    List<DgMobile> findWhereVersionGreaterThan(@Param("version") int version);

}

正如您所看到的，在声明到Repository中的最后一个方法中，我正在尝试使用在我的orm.xml文件中声明的本机sql查询。

构建项目时，将显示下一个错误：

创建名为'dgMobileRepository'的bean时出错：调用init 方法失败;嵌套异常是 org.springframework.data.mapping.PropertyReferenceException：没有找到类型DgMobile的属性findWhereVersion！

我已经尝试为orm xml使用不同的名称并在persistence.xml上声明它，也尝试不要声明它，因为Springboot + JPA默认情况下在META-INF上搜索它。

我知道许多人根据惯例不赞成使用XML来支持使用注释。但对我而言，一个重要的原因是，当您使用大量复杂的表和数据时，您的查询有时非常大，当您将它们复制到SQL编辑器时，您不希望花时间格式化它们。因此，在这种情况下，我明确地不要使用JPA注释和ORM（XML声明）的混合进行查询。

完整代码可在github上找到。

作为附加信息，我按照以下说明操作：https://hahamo.wordpress.com/2016/06/21/jpa-queries-in-xml-files/

Lads，我缺少什么？

JPA忽略了orm.xml

0 个答案: