JPA空表和连接表

我知道truncate不被支持，所以我做了一个Delete from table - 这个工作非常好，但连接表没有以这种方式清理。例如：JPA空表和连接表

Delete from Product; 
Delete from Service;

两者都为空，表格service_product仍填满。有没有机会清理我的连接表没有原始的SQL？

例如实体

public class Service implements Serializable { 
    private static final long serialVersionUID = 4520872456865907866L; 
    // seam-gen attributes (you should probably edit these) 

    @EmbeddedId 
    private ServiceId id; 

    @Length(max = 255) 
    private String servicename; 

    @Column(columnDefinition = "text") 
    private String highlightsText; 
    @Column(columnDefinition = "text") 
    private String detailsText; 
    @Column(columnDefinition = "text") 
    private String productText; 
    @Column(columnDefinition = "text") 
    private String dataText; 

    @ManyToMany(mappedBy = "services") 
    private Set<Machine> machines; 

    @OneToMany(targetEntity = ServiceDownload.class, cascade = { CascadeType.ALL }, fetch = FetchType.LAZY) 
    private List<ServiceDownload> serviceDownloads; 

    @OneToMany(targetEntity = ProductSpecial.class, cascade = { CascadeType.ALL }) 
    private List<ProductSpecial> productSpecials; 

    @OneToOne(cascade = { CascadeType.ALL }) 
    private ServicePicture servicePicture; 
... 
}

来源

2010-09-23 onigunn

可能的重复[如何批量删除使用批量更新]（http://stackoverflow.com/questions/735201/how-to-batch-delete-using-bulkupdate） – 2010-09-23 14:08:31

Y你应该添加@OnDelete（action = OnDeleteAction.CASCADE）注解。所以，如果你正在使用Hibernate的尝试：

@OneToMany(targetEntity = ServiceDownload.class, cascade = { CascadeType.ALL }, fetch = FetchType.LAZY) 
@OnDelete(action=OnDeleteAction.CASCADE) 
private List<ServiceDownload> serviceDownloads;

见http://docs.jboss.org/hibernate/stable/annotations/reference/en/html/entity.html的一些例子和文档。

来源

2010-09-23 14:55:54 Adam

你要获取全表（FROM Product），迭代的实体和使用session.delete(..)
DELETE不会触发级联
truncate删除他们，如果它的支持原生SQL查询

来源

2010-09-23 12:26:50 Bozho

JPA空表和连接表

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