5

这是包含 blob 类型的实体：

@Entity
@Table(name="image_info")
public class ImageInfo extends Model {

    .......

    @Constraints.Required
    private Blob image;

    .......
}

$ play -DapplyEvolutions.default=true 运行

我收到如下错误：

[warn] c.j.b.ConnectionPartition - BoneCP detected an unclosed connection and will now attempt to close it for you. You should be closing this connection in your application - enable connectionWatch for additional debugging assistance.
[error] c.a.e.s.t.r.ImmutableMetaFactory - Was unable to use reflection to find a constructor and appropriate getters forimmutable type interface java.sql.Blob.  The errors while looking for the getter methods follow:
[error] c.a.e.s.d.p.DeployCreateProperties - Error with models.ImageInfo field:image
java.lang.RuntimeException: Unable to use reflection to build ImmutableMeta for interface     java.sql.Blob.  Associated Errors trying to find a constructor and getter methods have been logged
at com.avaje.ebeaninternal.server.type.reflect.ImmutableMetaFactory.createImmutableMeta(ImmutableMetaFactory.java:71) ~[ebean.jar:na]
at com.avaje.ebeaninternal.server.type.DefaultTypeManager.recursiveCreateScalarTypes(DefaultTypeManager.java:227) ~[ebean.jar:na]
at com.avaje.ebeaninternal.server.deploy.parse.DeployCreateProperties.createProp(DeployCreateProperties.java:357) [ebean.jar:na]
at com.avaje.ebeaninternal.server.deploy.parse.DeployCreateProperties.createProp(DeployCreateProperties.java:377) [ebean.jar:na]
at com.avaje.ebeaninternal.server.deploy.parse.DeployCreateProperties.createProperties(DeployCreateProperties.java:168) [ebean.jar:na]
at com.avaje.ebeaninternal.server.deploy.parse.DeployCreateProperties.createProperties(DeployCreateProperties.java:94) [ebean.jar:na]

如何进行更改以便可以识别 blob 类型？

4

1 回答 1

10

要blob使用 Ebean 创建，您需要使用带@Lob注释的字节数组

@Lob
public byte[] image;

很可能您需要在 File <-> 字节数组之间进行转换，所以将文件存储在文件系统中可能更容易？（除了在 FS 中存储文件比在 DB 中存储文件更便宜）

如果您需要特殊的访问限制，您可以使用自己的控制器检查权限并通过存储在数据库中的路径从磁盘流式传输文件。

于 2012-05-30T01:11:45.320 回答