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从表中选择特定列，然后使用Spring + hibernate + JPA将结果存储到非实体POJO

[英]select specific columns from the table and store the results to the non-entity POJO with Spring + hibernate + JPA

 原文  2017-01-06 19:36:31  3   4    java/ spring/ hibernate/ jpa

问题描述

我正在使用Spring 3.1.3 + hibernate-entitymanager 5.0.7 （其中包含2.1版的JPA ）+ ojdbc14-10.2.0.2.jar

我想从表中选择特定的列，并将结果存储到非实体POJO。 我想以以下链接中建议的方式实施

Spring Data JPA将结果映射到非实体POJO

我的实体类： 

   @Entity
    @Data
    @Table(name = "CUSTOMER")
    @SqlResultSetMapping(name="SampleMapping",
    classes = {
     @ConstructorResult(targetClass = com.entity.Sample.class,
       columns = {@ColumnResult(name="customerId"), @ColumnResult(name="name"), @ColumnResult(name="firstName")}
     )}
    )
    public class CustomerEntity {

        @Id
        @Column(name = "CUSTOMER_ID")
        private String customerId;

        @Column(name = "NAME")
        private String name;

        @Column(name = "FIRST_NAME")
        private String firstName;

       @Column(name = "LAST_NAME")
        private String lastName;

       @Column(name = "AGE")
        private String age;
    }

我的查询部分： 

String q = "select s.customerId, s.name, s.firstName from CustomerEntity s";
Query query = entityManager.createNativeQuery(q,"SampleMapping");
List<Sample> resultsList = query.getResultSet();

示例类是简单的POJO（带有带有customerId，name和firstName的参数化构造函数），我要在其中存储查询结果。

您能告诉我我需要添加哪个版本的Spring，Hibernate，JPA，ojdbc jars才能达到我的要求？ 提前谢谢了。

如果以下异常是由于jar版本或注释或查询格式的任何不正确声明所致，则无法识别。

因为添加以下罐子时几乎没有例外： 

    +- com.commons:commons-dao:jar:1.0## Heading ##-SNAPSHOT:compile
    |  +- oracle:ojdbc14:jar:10.2.0.2:compile
    |  +- org.springframework:spring-tx:jar:3.1.3.RELEASE:compile
    |  |  +- aopalliance:aopalliance:jar:1.0:compile
    |  |  \- org.springframework:spring-core:jar:3.1.3.RELEASE:compile
    |  +- org.springframework:spring-orm:jar:3.1.3.RELEASE:compile
    |  |  \- org.springframework:spring-jdbc:jar:3.1.3.RELEASE:compile
    |  +- org.hibernate:hibernate-entitymanager:jar:5.0.7.Final:compile
    |  |  +- org.hibernate:hibernate-core:jar:5.0.7.Final:compile
    |  |  |  +- antlr:antlr:jar:2.7.7:compile
    |  |  |  \- org.jboss:jandex:jar:2.0.0.Final:compile
    |  |  +- dom4j:dom4j:jar:1.6.1:compile
    |  |  +- org.hibernate.common:hibernate-commons-annotations:jar:5.0.1.Final:compile
    |  |  +- org.hibernate.javax.persistence:hibernate-jpa-2.1-api:jar:1.0.0.Final:compile
    |  |  \- org.apache.geronimo.specs:geronimo-jta_1.1_spec:jar:1.1.1:compile
    |  +- org.javassist:javassist:jar:3.14.0-GA:compile
    |  +- javax.resource:connector:jar:1.0:compile
    |  |  +- org.springframework:spring-oxm:jar:3.1.3.RELEASE:compile
    |  |     \- org.apache.httpcomponents:httpclient-cache:jar:4.2.4:compile
    |  +- org.springframework:spring-beans:jar:3.1.3.RELEASE:compile (version managed from 3.1.2.RELEASE)
    |  +- org.springframework:spring-context:jar:3.1.3.RELEASE:compile (version managed from 3.1.2.RELEASE)
    |  |  +- org.springframework:spring-expression:jar:3.1.3.RELEASE:compile
    |  |  \- org.springframework:spring-asm:jar:3.1.3.RELEASE:compile
    |  +- org.slf4j:jcl-over-slf4j:jar:1.6.4:runtime
    |  \- org.slf4j:log4j-over-slf4j:jar:1.6.4:runtime
    |  +- org.springframework:spring-webmvc:jar:3.1.3.RELEASE:compile
    |  |  \- org.springframework:spring-context-support:jar:3.1.3.RELEASE:compile
    |  +- org.springframework:spring-web:jar:3.1.3.RELEASE:compile
    |  +- org.springframework:spring-aop:jar:3.1.3.RELEASE:compile
    |  +- org.springframework.integration:spring-integration-core:jar:2.2.6.RELEASE:compile
    |  |  \- org.springframework.retry:spring-retry:jar:1.0.2.RELEASE:compile
    |  +- org.springframework.integration:spring-integration-event:jar:2.2.6.RELEASE:runtime
    |  +- org.springframework.integration:spring-integration-file:jar:2.2.6.RELEASE:runtime
    |  +- org.springframework.integration:spring-integration-http:jar:2.2.6.RELEASE:compile
    |  +- org.springframework.integration:spring-integration-xml:jar:2.2.6.RELEASE:compile
    |  |  \- org.springframework.ws:spring-xml:jar:2.1.1.RELEASE:compile
    |  +- org.springframework.integration:spring-integration-jms:jar:2.2.6.RELEASE:compile
    |  |  \- org.springframework:spring-jms:jar:3.1.3.RELEASE:compile
    |  +- org.springframework.integration:spring-integration-ws:jar:2.2.6.RELEASE:compile
    |  |  \- org.springframework.ws:spring-ws-core:jar:2.1.1.RELEASE:compile
    +- org.hibernate:hibernate-validator:jar:4.3.0.Final:compile
    +- log4j:log4j:jar:1.2.17:provided
    +- org.slf4j:slf4j-api:jar:1.7.12:compile
    +- org.jboss.logging:jboss-logging:jar:3.3.0.Final:compile
    \- org.slf4j:slf4j-simple:jar:1.7.12:compile

但是我在以下行中导致以下异常 

List<Sample> resultsList = query.getResultSet();

例外： 

 org.springframework.dao.InvalidDataAccessResourceUsageException: could not extract ResultSet; SQL [n/a]; nested exception is org.hibernate.exception.SQLGrammarException: could not extract ResultSet
           at org.springframework.orm.hibernate3.SessionFactoryUtils.convertHibernateAccessException(SessionFactoryUtils.java:635) ~[spring-orm-3.1.3.RELEASE.jar:3.1.3.RELEASE]
           at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:104) ~[spring-orm-3.1.3.RELEASE.jar:3.1.3.RELEASE]
           at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:403) ~[spring-orm-3.1.3.RELEASE.jar:3.1.3.RELEASE]
           at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:58) ~[spring-tx-3.1.3.RELEASE.jar:3.1.3.RELEASE]
           at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213) ~[spring-tx-3.1.3.RELEASE.jar:3.1.3.RELEASE]
           at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:163) ~[spring-tx-3.1.3.RELEASE.jar:3.1.3.RELEASE]
           at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) ~[spring-aop-3.1.3.RELEASE.jar:3.1.3.RELEASE]
           at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202) ~[spring-aop-3.1.3.RELEASE.jar:3.1.3.RELEASE]
           at com.common.dao.SampleServiceImpl.sampleMethod(SrvImplemet.java:123) ~[commons-dao-1.0-SNAPSHOT.jar:na]

      Caused by: org.hibernate.exception.SQLGrammarException: could not extract ResultSet
           at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:106) ~[hibernate-core-5.0.7.Final.jar:5.0.7.Final]
           at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42) ~[hibernate-core-5.0.7.Final.jar:5.0.7.Final]
           at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:109) ~[hibernate-core-5.0.7.Final.jar:5.0.7.Final]
           at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:95) ~[hibernate-core-5.0.7.Final.jar:5.0.7.Final]
           at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:79) ~[hibernate-core-5.0.7.Final.jar:5.0.7.Final]
           at org.hibernate.loader.Loader.getResultSet(Loader.java:2116) ~[hibernate-core-5.0.7.Final.jar:5.0.7.Final]
           at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1899) ~[hibernate-core-5.0.7.Final.jar:5.0.7.Final]
           at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1875) ~[hibernate-core-5.0.7.Final.jar:5.0.7.Final]
           at org.hibernate.loader.Loader.doQuery(Loader.java:919) ~[hibernate-core-5.0.7.Final.jar:5.0.7.Final]
           at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:336) ~[hibernate-core-5.0.7.Final.jar:5.0.7.Final]
           at org.hibernate.loader.Loader.doList(Loader.java:2611) ~[hibernate-core-5.0.7.Final.jar:5.0.7.Final]
           at org.hibernate.loader.Loader.doList(Loader.java:2594) ~[hibernate-core-5.0.7.Final.jar:5.0.7.Final]
           at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2423) ~[hibernate-core-5.0.7.Final.jar:5.0.7.Final]
           at org.hibernate.loader.Loader.list(Loader.java:2418) ~[hibernate-core-5.0.7.Final.jar:5.0.7.Final]
           at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:336) ~[hibernate-core-5.0.7.Final.jar:5.0.7.Final]
           at org.hibernate.internal.SessionImpl.listCustomQuery(SessionImpl.java:1967) ~[hibernate-core-5.0.7.Final.jar:5.0.7.Final]
           at org.hibernate.internal.AbstractSessionImpl.list(AbstractSessionImpl.java:322) ~[hibernate-core-5.0.7.Final.jar:5.0.7.Final]
           at org.hibernate.internal.SQLQueryImpl.list(SQLQueryImpl.java:125) ~[hibernate-core-5.0.7.Final.jar:5.0.7.Final]
           at org.hibernate.jpa.internal.QueryImpl.list(QueryImpl.java:606) ~[hibernate-entitymanager-5.0.7.Final.jar:5.0.7.Final]
           at org.hibernate.jpa.internal.QueryImpl.getResultList(QueryImpl.java:483) ~[hibernate-entitymanager-5.0.7.Final.jar:5.0.7.Final]
           at com.common.dao.SampleDaompl.sampleMethod.SampleDaoImpl.getData(SampleDaoImpl.java:16) ~[commons-dao-1.0-SNAPSHOT.jar:na]
           at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.7.0_51]
           at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[na:1.7.0_51]
           at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.7.0_51]
           at java.lang.reflect.Method.invoke(Method.java:606) ~[na:1.7.0_51]
           at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:319) ~[spring-aop-3.1.3.RELEASE.jar:3.1.3.RELEASE]
           at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183) ~[spring-aop-3.1.3.RELEASE.jar:3.1.3.RELEASE]
           at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150) ~[spring-aop-3.1.3.RELEASE.jar:3.1.3.RELEASE]
           at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:155) ~[spring-tx-3.1.3.RELEASE.jar:3.1.3.RELEASE]
           ... 191 common frames omitted
    Caused by: java.sql.SQLException: ORA-00942: table or view does not exist

           at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112) ~[ojdbc14-10.2.0.2.jar:Oracle JDBC Driver version - "10.2.0.1.0"]
           at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:331) ~[ojdbc14-10.2.0.2.jar:Oracle JDBC Driver version - "10.2.0.1.0"]
           at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:288) ~[ojdbc14-10.2.0.2.jar:Oracle JDBC Driver version - "10.2.0.1.0"]
           at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:743) ~[ojdbc14-10.2.0.2.jar:Oracle JDBC Driver version - "10.2.0.1.0"]
           at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:216) ~[ojdbc14-10.2.0.2.jar:Oracle JDBC Driver version - "10.2.0.1.0"]
           at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:799) ~[ojdbc14-10.2.0.2.jar:Oracle JDBC Driver version - "10.2.0.1.0"]
           at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1039) ~[ojdbc14-10.2.0.2.jar:Oracle JDBC Driver version - "10.2.0.1.0"]
           at oracle.jdbc.driver.T4CPreparedStatement.executeMaybeDescribe(T4CPreparedStatement.java:839) ~[ojdbc14-10.2.0.2.jar:Oracle JDBC Driver version - "10.2.0.1.0"]
           at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1132) ~[ojdbc14-10.2.0.2.jar:Oracle JDBC Driver version - "10.2.0.1.0"]
           at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3285) ~[ojdbc14-10.2.0.2.jar:Oracle JDBC Driver version - "10.2.0.1.0"]
           at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3329) ~[ojdbc14-10.2.0.2.jar:Oracle JDBC Driver version - "10.2.0.1.0"]
           at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:93) ~[commons-dbcp-1.2.2.jar:1.2.2]
           at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:70) ~[hibernate-core-5.0.7.Final.jar:5.0.7.Final]
           ... 215 common frames omitted

注意：以前，当我尝试选择所有行并将结果存储到具有依赖项Spring 3.1.3 + hibernate-entitymanager 3.5.3 + JPA 2.0 + ojdbc14-10.2.0.2.jar的实体类中时，我能够获取结果成功，没有任何异常。

差异：

  1. jar版本的hibernate-entitymanager 3.5.3和JPA的2.0版
  2. 查询被选中* ..
  3. 没有 @SqlResultSetMapping批注的实体类

4 个解决方案

解决方案1
 1  2017-01-06 20:19:11

如果我理解您的问题正确，那么您已有一个包含以下各列的表

  • 名称，名字，姓氏，年龄（可能还有更多列）

您想要创建一个实体，以便可以从该表中获取数据。

首先要注意的是，所有JPA实体必须具有主键（@ID列）。 其次，我从来不需要使用@SqlResultSetMapping来工作。

在我们的系统中，我们有一个直接映射到一个实体的View，该实体与我们系统中的任何其他实体之间没有区别，如果您不查看数据库，您将不会知道没有表（但是一个视图）。

编辑我可以看到我错过了部分问题。 因此，这就是您所要求的。

您需要查看一个JPQL构造函数表达式，它基本上允许您将所需的列选择到您选择的POJO中，但是POJO的构造函数必须能够精确列出参数。

解决方案2
 1  2017-01-07 21:02:13

您可以使用条件和预测 

Criteria query = session.createCriteria(CustomerEntity.class)
    .setProjection(Projections.projectionList()
                .add(Projections.property("customerId"), "customerId")
                .add(Projections.property("name"), "name")
                .add(Projections.property("firstName"), "firstName"));

query.setResultTransformer(new AliasToBeanResultTransformer(Sample.class));

List<Sample> list = query.list();

样本类 

public class Sample {

    private String customerId;
    private String name;
    private String firstName;

    public Sample(){
    }

    public String getCustomerId() {
        return customerId;
    }
    public void setCustomerId(String customerId) {
        this.customerId = customerId;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getFirstName() {
        return firstName;
    }
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }


}

解决方案3
 0  2017-01-06 19:47:28

这是您可以执行的操作： 

List<Sample> resultList = new ArrayList<>();
ResultSet rs = query.getResultSet();

while (rs.next()) {
    ResultSetMetaData metadata = rs.getMetaData();

    for (int i = 1; i <= metadata.getColumnCount(); i++) {
        System.out.println("Column Name: " + metadata.getColumnName(i)
                + " | Value: " + rs.getObject(i));
    }

    Sample sample = new Sample();
    sample.setSomeValue(rs.getObject(1));
    sample.setSomeOtherValue(rs.getObject(2));

    resultList.add(sample);
}

请注意，这里使用ResultSetMetaData是可选的。 我用它来说明如何根据需要提取列名。

解决方案4
 0  2017-01-06 21:55:46

这是一种方法。 

@Entity
@Table(name = "CUSTOMER")
@NamedNativeQuery(name = "findSampleMapping", 
    query = "SELECT CUSTOMER_ID, NAME, FIRST_NAME FROM CUSTOMER where CUSTOMER_ID = ?1", resultSetMapping = "SampleMapping")
@SqlResultSetMapping(name="SampleMapping",
classes = {
 @ConstructorResult(targetClass = com.entity.Sample.class,
   columns = {@ColumnResult(name="customerId"), @ColumnResult(name="name"), @ColumnResult(name="firstName")}
 )}
)
public class CustomerEntity {

    @Id
    @Column(name = "CUSTOMER_ID")
    private String customerId;

    @Column(name = "NAME")
    private String name;

    @Column(name = "FIRST_NAME")
    private String firstName;

   @Column(name = "LAST_NAME")
    private String lastName;

   @Column(name = "AGE")
    private String age;
}



public class Sample {


    private String customerId;
    private String name;
    private String firstName;

    public Sample(String customerId, String name, String firstName){
        this.customerId = customerId;
        this.name = name;
        this.firstName = firstName;
    }

    public String getCustomerId() {
        return customerId;
    }
    public void setCustomerId(String customerId) {
        this.customerId = customerId;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getFirstName() {
        return firstName;
    }
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }


}



Query q = em.createNamedQuery("findSampleMapping");
q.setParameter(1, "1");
@SuppressWarnings("unchecked")
List<Sample> list = q.getResultList();
for (Sample row : list) {
    System.out.println(row.getCustomerId());
}

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