我的数据库模式中两个表的休眠映射有问题。一个被称为BINARY_DATA_CONTENTS
,另一个是BINARY_DATA
。BINARY_DATA
只有一个名称字段和一个指向BINARY_DATA_CONTENTS
. 这是模式的样子:
BINARY_DATA_CONTENTS:
CREATE TABLE `BINARY_DATA_CONTENTS` (
`BINARY_DATA_CONTENTS_ID` varchar(255) NOT NULL,
`BINARY_DATA` longblob, -- stores the data
PRIMARY KEY (`BINARY_DATA_CONTENTS_ID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
二进制数据:
CREATE TABLE `BINARY_DATA` (
`BINARY_DATA_ID` varchar(255) NOT NULL DEFAULT '',
`BINARY_DATA_NAME` varchar(255) DEFAULT NULL, -- just a filename
`BINARY_DATA_CONTENTS_ID` varchar(255) DEFAULT NULL, -- points to BINARY_DATA_CONTENTS
PRIMARY KEY (`BINARY_DATA_ID`),
KEY `BINARY_DATA_CONTENTS_FK` (`BINARY_DATA_CONTENTS_ID`),
CONSTRAINT `BINARY_DATA_CONTENTS_FK` FOREIGN KEY (`BINARY_DATA_CONTENTS_ID`) REFERENCES `BINARY_DATA_CONTENTS` (`BINARY_DATA_CONTENTS_ID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
我为这些表中的每一个都有 Java 类。
二进制数据内容:
@Entity
@Table(name="BINARY_DATA_CONTENTS")
@Proxy(lazy=true)
@Inheritance(strategy= InheritanceType.JOINED)
public class BinaryDataContents implements Serializable, Persistable<BinaryDataContents>, Cloneable {
private static final long serialVersionUID = /** blah */;
@Id
@GeneratedValue(generator="uuid") @GenericGenerator(name="uuid", strategy="uuid")
@Column(name="BINARY_DATA_CONTENTS_ID")
private String id;
@Column(name="BINARY_DATA", length=32*1024*1024, columnDefinition="longblob") @Lob
private byte[] contents;
/**
* Hibernate constructor
*/
public BinaryDataContents() { }
public BinaryDataContents(byte[] contents) {
this.contents = ArrayUtils.clone(contents);
}
public byte[] getContents() {
return contents;
}
// etc...
二进制数据:
@Entity
@Table(name="BINARY_DATA")
@Inheritance(strategy=InheritanceType.JOINED)
public class BinaryData implements Serializable, Persistable<BinaryData>, Cloneable {
private static final long serialVersionUID = 2154854247822039938L;
@Id @Column @GeneratedValue(generator="uuid") @GenericGenerator(name="uuid", strategy="uuid")
private String id;
@Column
private String binaryDataName;
@OneToMany(cascade = CascadeType.ALL)
@JoinColumn(name="BINARY_DATA_CONTENTS_ID", nullable=true) @ForeignKey(name="BINARY_DATA_CONTENTS_FK")
private Collection<BinaryDataContents> binaryDataContents;
@Transient
private String cacheId;
/**
* Hibernate constructor
*/
public BinaryData() { this.binaryDataContents = Sets.newHashSet(new BinaryDataContents()); }
/**
* Create a new instance of BinaryData.
*
* @param binaryDataData <code>byte []</code> of the file to store.
* @param binaryDataName Name of attachment
*/
public BinaryData(byte[] binaryDataData, String binaryDataName) {
this.binaryDataContents = Sets.newHashSet(new BinaryDataContents(ArrayUtils.clone(binaryDataData)));
this.binaryDataName = binaryDataName;
}
/**
* Returns the BinaryData byte stream.
*
* @return binaryDataContents byte stream
*/
public byte[] getData() {
return binaryDataContents.iterator().next().getContents();
}
/**
* Returns the BinaryData name.
*
* @return BinaryData name
*/
public String getBinaryDataName() {
return binaryDataName;
}
// etc...
我希望BinaryDataContents
延迟加载,仅在需要时(通过getData
in BinaryData
)。我不确定我是否正确设置了所有注释,因为在尝试保存新BinaryData
对象时出现错误:
PersistenceException: Failed to commit
Caused by: org.hibernate.exception.SQLGrammarException: Could not execute JDBC batch update
Caused by: java.sql.BatchUpdateException: Unknown column 'AUTHORISATION_REQUEST_ID' in 'field list'
AUTHORISATION_REQUEST_ID
这很奇怪,因为在这些表或类中没有任何列或字段被调用。看来休眠已经出问题了,并且正在将奇怪的列名放入 SQL 中:
insert into BINARY_DATA (BINARY_DATA_NAME, AUTHORISATION_REQUEST_ID) values (?, ?)
关于可能导致这种情况的任何想法?谢谢你。
更新 1
如果我使用@OneToOne
注释,错误会略有变化。BINARY_DATA_CONTENTS
插入似乎生成了正确的 SQL :
insert into BINARY_DATA_CONTENTS (BINARY_DATA, BINARY_DATA_CONTENTS_ID) values (?, ?)
但是,BINARY_DATA
插入仍然有一个随机的列名:
insert into BINARY_DATA (BINARY_DATA_CONTENTS_ID, BINARY_DATA_NAME, AUTHORISATION_REQUEST_ID) values (?, ?, ?)
更新 2
根据AUTHORISATION_REQUEST_ID
我在应用程序中注册所有休眠注释类的顺序(有时DATABASE_UPGRADE_ID
是 应用程序保留了这些类的列表并将它们传递给某种疯狂的 PersistenceConfiguration,它会用它做各种奇怪的事情。大概就是这个原因吧……