休眠外键约束问题多对一

首先，让我说，我知道这是尚未“另一个”与外键的Hibernate问题。然而，我在这里找到的解决方案似乎都不适合我。所以我在这里寻找帮助。休眠外键约束问题多对一

数据库
这是父表

CREATE TABLE FORM (
    FORM_ID NUMBER, 
    NAME  VARCHAR2(40), 
CONSTRAINT form_pk PRIMARY KEY (form_id));

这是子表

CREATE TABLE REJECTION (
    REJECTION_ID NUMBER, 
    REASON VARCHAR2(2000), 
    FORM_ID NUMBER, 
CONSTRAINT rej_pk PRIMARY_KEY (rejection_id), 
CONSTRAINT rej_fk1 FOREIGN KEY (form_id) REFERENCE form(form_id));

每个表中有插入

之前填充主键触发

个实体对象
这是父实体对象：

@Entity 
@Table(name = "FORM") 
public class Form implements Serializable { 
    @Id 
    @Column(name = "FORM_ID", unique = true, nullable = false) 
    @GeneratedValue(strategy = GenerationType.AUTO, generator = "G1") 
    @SequenceGenerator(name = "G1", sequenceName = "FORM_SEQ") 
    // This uses a trigger to generate the ID 
    private Integer formId; 

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

    @OneToMany(mappedBy = "form") 
    private Set<Rejection> rejections; 

    // getters and setters 
}

这里是为孩子的实体对象：

@Entity 
@Table(name = "REJECTION") 
public class Rejection implements Serializable { 
    @Id 
    @Column(name = "REJECTION_ID", unique = true, nullable = false) 
    @GeneratedValue(strategy = GenerationType.AUTO, generator = "G2") 
    @SequenceGenerator(name = "G2", sequenceName = "REJECTION_SEQ") 
    // This uses a trigger to generate the ID 
    private Integer rejectionId; 

    @Column(name="REASON") 
    private String reason; 

    @ManyToOne 
    @JoinColumn(name="FORM_ID") 
    private Form form; 

    // getters and setters 
}

的hibernate.cfg.xml

<hibernate-configuration> 
    <session-factory> 
     <property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property> 
     <property name="hibernate.connection.url">jdbc:oracle:thin:@someConnection</property> 
     <property name="hibernate.connection.username">pancakes</property> 
     <property name="hibernate.connection.password">syrup</property> 
     <property name="hibernate.dialect">org.hibernate.dialect.Oracle10gDialect</property> 

     <property name="hibernate.current_session_context_class">thread</property> 
     <property name="show_sql">true</property> 
     <property name="format_sql">true</property> 
     <property name="use_sql_comments">false</property> 

     <property name="hibernate.c3p0.min_size">1</property> 
     <property name="hibernate.c3p0.max_size">20</property> 
     <property name="hibernate.c3p0.timeout">3000</property> 
     <property name="hibernate.c3p0.max_statements">50</property> 
     <property name="hibernate.c3p0.idle_test_period">300</property> 
     <property name="hibernate.c3p0.preferredTestQuery">SELECT 1 from DUAL</property> 

     <mapping class="com.entity.Form"></mapping> 
     <mapping class="com.entity.Rejection"></mapping> 
    </session-factory> 
</hibernate-configuration>

守则
最后，这里是我使用的代码片段：

session = HibernateUtil.getSessionFactory().openSession(); 
session.beginTransaction(); 

Form form = new Form(); 
form.setName("Test"); 

session.save(form); 

System.out.println("Form ID: " + form.getFormId()); 

Rejections rej = new Rejection(); 
rej.setReason("Some Reason"); 
rej.setForm(form); 

session.save(rej); 

System.out.println("Rejection ID: " + rej.getRejectionId()); 

session.getTransaction().commit(); 
session.close();

的错误
我得到的错误是：
java.sql.SQLIntegrityConstraintViolationException: ORA-02291: integrity constraint (USER.REJ_FK1) violated - parent key not found

两者的System.outs实际上会返回一个值。

我在想什么是生成ID的触发器的问题。

我非常感谢任何帮助或指导。谢谢！

来源

2014-09-18 Ascalonian

我想通了。问题在于IDS上的触发器和序列发生器。它本质上是从触发器中产生2个IDS，一个来自Hibernate。当Hibernate需要Hibernate中的一个时，Hibernate试图使用Trigger中的那个。

我刚刚禁用触发器，它工作正常:-)

来源

2014-09-18 19:09:52 Ascalonian

休眠外键约束问题多对一

回答

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