爲什麼MyEclipse在編譯時顯示未找到join_table錯誤

Question

我有以下兩個實體，但在Trainer的oneToMany關係行中，它顯示錯誤消息「連接表trainer_batch無法找到」，而我正在使用@JoinColumn註釋。 Plggrams情況如下...

 
@Entity 
@Table(name="trainer") 
public class Trainer { 

    @Id 
    @GeneratedValue(strategy=GenerationType.IDENTITY) 
    int id; 
    String name; 
    @OneToMany(cascade=CascadeType.ALL) 
    @JoinColumn(name="trainerid") 
    Set batches=new HashSet(); 
    public String getName() { 
     return name; 
    } 
    public void setName(String name) { 
     this.name = name; 
    } 
    public Set getBatches() { 
     return batches; 
    } 
    public void setBatches(Batch batch) { 
     batches.add(batch); 
    } 


} 


@Entity 
@Table(name="batch") 
public class Batch { 

    public String getSlot() { 
     return slot; 
    } 
    public void setSlot(String slot) { 
     this.slot = slot; 
    } 
    public String getTopic() { 
     return topic; 
    } 
    public void setTopic(String topic) { 
     this.topic = topic; 
    } 
    @Id 
    @GeneratedValue(strategy=GenerationType.IDENTITY) 
    int id; 
    String slot; 
    String topic; 

} 

persistance.xml是如下

 

<?xml version="1.0" encoding="UTF-8"?> 
<persistence xmlns="http://java.sun.com/xml/ns/persistence" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence 
    http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" version="1.0"> 

    <persistence-unit name="one_to_many_pk_fkPU" transaction-type="RESOURCE_LOCAL"> 
     <provider>org.hibernate.ejb.HibernatePersistence</provider> 
     <properties> 
      <property name = "hibernate.connection.driver_class" value = "com.microsoft.sqlserver.jdbc.SQLServerDriver"/> 
      <property name = "hibernate.connection.url" value = "jdbc:sqlserver://localhost:1433;DatabaseName=test; MARS_Connection=yes;"/> 
      <property name = "hibernate.connection.username" value = "sa"/> 
      <property name = "hibernate.connection.password" value = "test"/> 
      <property name="hibernate.dialect" value="org.hibernate.dialect.SQLServerDialect"/> 
     </properties> 
    </persistence-unit> 

</persistence> 

Answer 1

你應該使用一般的批次。 用戶關係如下： Set < Batch> batch = new HashSet < Batch>（）;