Java Spring JPA Hibernate未更新列
我将Spring4.1.0与HibernateEntityManager 4.1.9一起使用 另外,我正在使用Postgres 9.6 我有以下实体:Java Spring JPA Hibernate未更新列,java,postgresql,hibernate,jpa,spring-data-jpa,Java,Postgresql,Hibernate,Jpa,Spring Data Jpa,我将Spring4.1.0与HibernateEntityManager 4.1.9一起使用 另外,我正在使用Postgres 9.6 我有以下实体: @Entity @Table(name = "audit", schema = "public") @SequenceGenerator(name = "AUDIT_SEQUENCE", sequenceName = "AUDIT_SEQUENCE", allocationSize = 1, initialValue = 1) public cl
@Entity
@Table(name = "audit", schema = "public")
@SequenceGenerator(name = "AUDIT_SEQUENCE", sequenceName = "AUDIT_SEQUENCE", allocationSize = 1, initialValue = 1)
public class AuditTrail {
@Id
@Column(name = "auditid", unique = true)
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "AUDIT_SEQUENCE")
private long auditId;
@Column(name = "auditvalue")
private String auditValue;
... getter setters ...
}
这将使列结构变为字符(255)
我想将auditValue列的长度更新为10000。因此,我将实体更新为:
@Column(name = "auditvalue", length = 10000)
private String auditValue;
但列结构不会更新
My applicationContext.xml包含:
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="packagesToScan" value="com.avaya.mediamanager.entity" />
<property name="jpaVendorAdapter" ref="hbAdapterBean_pgsql"/>
<property name="jpaProperties">
<props>
<prop key="hibernate.show_sql">false</prop>
<prop key="hibernate.format_sql">true</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
<prop key="hibernate.id.new_generator_mappings">true</prop>
</props>
</property>
</bean>
<bean id="hbAdapterBean_pgsql" class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="showSql" value="false"></property>
<property name="generateDdl" value="true"></property>
<property name="databasePlatform" value="org.hibernate.dialect.PostgreSQLDialect"></property>
</bean>
假的
真的
更新
真的
如何从应用程序更新列?据我所知,
hibernate.hbm2ddl.auto
设置为update
实际上不会更新已创建的表,但会添加新表而不会删除数据
您可以将hibernate.hbm2ddl.auto
更改为create drop
,这将导致每次重新启动服务时都重新创建您的架构,但我不确定它是否正是您想要的,因为它还将删除您的所有数据
如果您想保留数据,可能需要考虑使用flyway之类的工具来填充数据
我希望这有帮助!
玩得开心 对不起,但我认为这在大多数情况下是不可接受的。