Eclipselink 和 eclipselink 尝试插入父 table，

Question

我遇到了以下问题：

每次我尝试创建一个 bloco 时，eclipselink 都会尝试插入一个 condominio 记录（应该为空），当我运行在一个简单的 java 项目中使用相同的代码（没有 spring) 它工作正常，但在 Web 项目中它一直试图插入 "parent" table.

eclipselink 试图强制双向关系的任何原因？

实体

公寓

private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Basic(optional = false)
@Column(name = "idcondominio")
private Integer idcondominio;
@Basic(optional = false)
@Column(name = "nomecond")
private String nomecond;
@Column(name = "cnpjcond")
private Integer cnpjcond;
@OneToMany(mappedBy = "condominio")
private Collection<Bloco> blocoCollection;

布洛科

private static final long serialVersionUID = 1L;
@EmbeddedId
protected BlocoPK blocoPK;
@Basic(optional = false)
@Column(name = "nomebloco")
private String nomebloco;
@Column(name = "numero")
private String numero;
@JoinColumn(name = "condominio_idcondominio", referencedColumnName = "idcondominio", insertable = false, updatable = false)
@ManyToOne(optional = false)
private Condominio condominio;

============================== 创建方法

public void create(Bloco bloco) throws PreexistingEntityException, Exception {
    if (bloco.getBlocoPK() == null) {
        bloco.setBlocoPK(new BlocoPK());
    }
    bloco.getBlocoPK().setCondominioIdcondominio(bloco.getCondominio().getIdcondominio());
    EntityManager em = null;
    try {
        em = getEntityManager();
        em.getTransaction().begin();
        Condominio condominio = bloco.getCondominio();
        if (condominio != null) {
            condominio = em.getReference(condominio.getClass(), condominio.getIdcondominio());
            bloco.setCondominio(condominio);
        }
        em.persist(bloco);
        if (condominio != null) {
            condominio.getBlocoCollection().add(bloco);
            condominio = em.merge(condominio);
        }
        em.getTransaction().commit();
    } catch (Exception ex) {
        if (findBloco(bloco.getBlocoPK()) != null) {
            throw new PreexistingEntityException("Bloco " + bloco + " already exists.", ex);
        }
        throw ex;
    } finally {
        if (em != null) {
            em.close();
        }
    }
}

========================= 控制器方法

@RequestMapping(value = "cadbloco", method = RequestMethod.POST)
public String cadbloco(@ModelAttribute(value = "Bloco") Bloco bloco, @RequestParam("condid") int idcond ) throws Exception {

    BlocoJpaController jpa = new BlocoJpaController();
    Condominio c = new Condominio();
    c.setIdcondominio(idcond);
    jpa.create(bloco);

    return ("redirect:bloco.htm");

}

=====================

类型异常报告

消息请求处理失败；嵌套异常是 javax.persistence.RollbackException: 异常 [EclipseLink-4002] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.DatabaseException

说明服务器遇到内部错误，无法完成此请求。

异常

org.springframework.web.util.NestedServletException：请求处理失败；嵌套异常是 javax.persistence.RollbackException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.DatabaseException 内部异常：com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException：列 'nomecond' 不能为空错误代码：1048 调用：INSERT INTO condominio (cnpjcond, nomecond) VALUES (?, ?) 绑定 => [绑定 2 个参数] 查询：InsertObjectQuery(Entity.Condominio[ idcondominio=null ]) org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:973) org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863) javax.servlet.http.HttpServlet.service(HttpServlet.java:648) org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837) javax.servlet.http.HttpServlet.service(HttpServlet.java:729) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)

Answer 1

异常显示 "nomecond" 值为空。所以在你的控制器中，如果你添加说

的代码

c.setNomeCond("Some value");

这应该可以解决问题。，

Answer 2

这是正确的方法，我没有在 bloco 中设置 condominio，所以当我尝试创建一个新的 bloco 时它没有 condominio。

我刚接触这类东西，有时会犯这些错误，但感谢您的帮助。

============================================= =====================

@RequestMapping(值="cadbloco",方法=RequestMethod.POST) public String cadbloco(@ModelAttribute(value = "Bloco") Bloco bloco, @RequestParam("condid") int idcond) 抛出异常{

    BlocoJpaController jpa = new BlocoJpaController();
    Condominio c = new Condominio();
    c.setIdcondominio(idcond);
    bloco.setCondominio(c);
    jpa.create(bloco);

    return ("redirect:bloco.htm");

}

Eclipselink 和 eclipselink 尝试插入父 table，

Eclipselink with eclipselink tries insert in the parent table,

java

spring-mvc

eclipselink

类型异常报告