亚洲成色在线综合网站,亚洲女人影院想要爱,久久久久亚洲av无码专区导航

hibernate.hbm2ddl.auto与import.sql

mmwy — Mon, 30 Oct 2006 16:32:00 GMT

�W�记一下：(x��)

设hibernate.hbm2ddl.auto为update/create-drop/create后，在classpath中扔一�?import.sql�q�去�Q�hibernate启动时就�?x��)执行import.sql的内宏V�?br />
11860 [main] INFO org.hibernate.tool.hbm2ddl.SchemaExport - Running hbm2ddl schema export
11860 [main] DEBUG org.hibernate.tool.hbm2ddl.SchemaExport - import file not found: /import.sql
11875 [main] INFO org.hibernate.tool.hbm2ddl.SchemaExport - exporting generated schema to database

mmwy 2006-10-31 00:32 发表评论

mmwy — Thu, 12 Oct 2006 07:54:00 GMT

最�q�在“玩”hibernate Annotation�Q�弄了个Attachment保存�q�数据库的测试，附�g内容保存在content属性里面�?br />

  @Lob
  @Column(columnDefinition = "LongBlob")
  public byte[] getContent() {
    return content;
  }

一开始，配置mysql jdbc url如下

jdbc.url            =    jdbc:mysql://localhost/test\
                            ?useUnicode=true\
                            &characterEncoding=gbk

一��试�Q�报�?br />

Caused by: java.sql.BatchUpdateException: Syntax error or access violation message from server: "You have an error in your SQL syntax near ''D0CF11E0A1B11AE1000000000000000000000000000000003E000300FEFF0900060000000000000' at line 1"
at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1540)

同样的语句，直接在mysql命��o(h��)行下�q�行��没问题�Q�偏偏jdbc上就有这臭毛病。换jdbc driver版本�Q�改@Lob�?@Type(type = "org.springframework.orm.hibernate3.support.BlobByteArrayType")�Q�改hibernate配置�Q�比如hibernate.jdbc.use_streams_for_binary true�Q�，甚至是直接用jdbc来insert�Q��ؕ七八�p�折腑֍�天，问题照旧。最后只好用上“歪”招�Q�把byte[]配成String�Q�在保存的时候把byte[]保存成hex String格式�Q�取的时候再解码回来�?br />
歪招�l�归是歪招，�q�两天老�ؓ(f��)�q�东西心烦，晚上吃饭的时候无意中惌��vcharset的问题，把代码捡回来再测试了一下，问题解决�Q�哈哈！

jdbc.url            =    jdbc:mysql://localhost/mmwy_blog\
                            ?useUnicode=true\
                            &characterEncoding=utf-8

如果设成iso-8859-1、utf-8,保存一炚w��题都没有�Q�换用gbk、gb2312、big5之类的字�W�集�Q�问题就出来了�?br />

mmwy 2006-10-12 15:54 发表评论

hibernate annotations试用

mmwy — Thu, 12 Oct 2006 07:38:00 GMT

最�q�开始尝试hibernate annotations�Q�终于成功的��手上一个小应用转�ؓ(f��)annotations �Q�）

1、spring orm support
与原来��用LocalSessionFactoryBean相比�Q�变动不大（AnnotationSessionFactoryBean本来��是从LocalSessionFactoryBean�cȝ��承过来的嘛）

1    <bean
2         id="sessionFactory"
3         class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"
4         parent="AbstractSessionFactory">
5         <property name="annotatedClasses">
6             <list>
7                 <value>xxx.xxx.xxx.domain.Accountvalue>
8             list>
9         property>
10     bean>
11     <bean
12         id="AbstractSessionFactory"
13         class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"
14         abstract="true">
15         <property
16             name="dataSource"
17             ref="DataSource" />
18         <property name="hibernateProperties">
19             <props>
20                 <prop key="hibernate.dialect">${hibernate.dialect}prop>
21                 <prop key="hibernate.show_sql">${hibernate.show_sql}prop>
22                 <prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}prop>
23                 <prop key="hibernate.cache.use_query_cache">${hibernate.cache.use_query_cache}prop>
24                 <prop key="hibernate.cache.provider_class">${hibernate.cache.provider_class}prop>
25             props>
26         property>
27         <property
28             name="lobHandler"
29             ref="DefaultLobHandler" />
30     bean>

2、id的配�|?/b>
非常��单，在id的getter上面加个“@Id”就可以了。此旉��用的id�{�略是javax.persistence.GenerationType.AUTO�Q�也可以再加上“@GeneratedValue(generator =GenerationType.IDENTITY|GenerationType.SEQUENCE|GenerationType.TABLE)”换成其它策略�?br />我的应用采用的是hibernate的uuid�{�略�Q�就不得不在�q�儿使用hibernate的扩展了
  @Id
  @Column(length = 32)
  @GeneratedValue(generator = "system-uuid")
  @GenericGenerator(name = "system-uuid", strategy = "uuid")

3、��联策�?/b>
在ejb3-persistence.jar中只定义了ALL、MERGE、PERSIST、REFRESH、REMOVE�Q�比较恶心的��是�Q�删除对象的时候，�q�不�?x��)��联删除关联对象，而是用update xx set parent_id=null where parent_id=?�q�类语句把关�p�d��掉了事。不得已�Q�在�q�儿用了hibernate的DELETE_ORPHAN�?br />
  @OneToMany(targetEntity = Attachment.class)
  @Cascade(value = {org.hibernate.annotations.CascadeType.DELETE_ORPHAN,
      org.hibernate.annotations.CascadeType.ALL})
  @JoinColumn(name = "info_id")
4、CACHE
ejb3-persistence.jar里面没有扑ֈ�cache的配�|�，�l�箋请出hibernate来干�z?br />
import org.hibernate.annotations.Cache;
import org.hibernate.annotations.CacheConcurrencyStrategy;

@Entity
@Table(name = "T_INFO")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
5、自定义字段�c�d��
我的POJO中有一个private String content;的属性，按ejb3配成@Lob后，被处理成了text�c�d��Q�text 64k的存储容量还是比较可怜了�?br />
  @Lob
  @Column(columnDefinition = "LongText")

mmwy 2006-10-12 15:38 发表评论