Java Hibernate@Filter枚举集合
我需要弄清楚如何应用基于注释的筛选,并将枚举的参数列表定义为:Java Hibernate@Filter枚举集合,java,hibernate,postgresql,enums,Java,Hibernate,Postgresql,Enums,我需要弄清楚如何应用基于注释的筛选,并将枚举的参数列表定义为: @Column(name = "target_status") @Enumerated(EnumType.STRING) @Type(type="PGEnumConverter", parameters = { @Parameter(name = "enumClassName", value = "com.company.model.campaign.CampaignTarget$Status"
@Column(name = "target_status")
@Enumerated(EnumType.STRING)
@Type(type="PGEnumConverter", parameters = {
@Parameter(name = "enumClassName",
value = "com.company.model.campaign.CampaignTarget$Status")
})
private Status targetStatus;
因此,我的@FilterDef
如下所示:
@FilterDef(name="filterCampaignTargetByStatuses",
defaultCondition="target_status in (:statuses)",
parameters = @ParamDef(name = "statuses", type = "string"))
session.enableFilter("filterCampaignTargetByStatuses").
setParameterList("statuses", statuses);
当我启用过滤器时,它如下所示:
@FilterDef(name="filterCampaignTargetByStatuses",
defaultCondition="target_status in (:statuses)",
parameters = @ParamDef(name = "statuses", type = "string"))
session.enableFilter("filterCampaignTargetByStatuses").
setParameterList("statuses", statuses);
我从hibernate得到的错误是:
org.hibernate.HibernateException: Incorrect type for parameter [statuses]
数据采用PostgreSQL格式,类型定义如下:
CREATE TYPE statuscmp AS ENUM ('ACTIVE','INACTIVE','PAUSED','DRAFT','SCHEDULED','ENDED','ARCHIVED');
我见过很多关于如何对单个枚举值进行条件查询和筛选的问题,但还没有一个关于对一组枚举值进行筛选的问题。有没有一种方法可以显式转换各个值?一般来说,您不必“转换”值,事实上,您只需以存储的形式传递值即可
如果我们假设您的字段仅注释为@Enumerated(EnumType.STRING)
,则该列将是一个普通的varchar字段。
(将java类型映射到postgres枚举是另一个重要主题。)
如果现在要将状态
枚举实例列表与数据库中的相关字符串值进行比较,请将其作为字符串集合传递,换句话说,如果它是java枚举
,请调用它的toString()
方法
例如,这是您的枚举:
public enum EntityStatus {
A, B, C;
}
这是您的实体:
import javax.persistence.Entity;
import javax.persistence.EnumType;
import javax.persistence.Enumerated;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import org.hibernate.annotations.Filter;
import org.hibernate.annotations.FilterDef;
import org.hibernate.annotations.ParamDef;
@Entity
@FilterDef(name = "byMultipleStates", defaultCondition = "status in (:states)", parameters = @ParamDef(name = "states", type = "string"))
@Filter(name = "byMultipleStates", condition = "status in (:states)")
public class StatusEntity {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private long id;
@Enumerated(EnumType.STRING)
private EntityStatus status;
public long getId() {
return id;
}
public EntityStatus getStatus() {
return status;
}
public void setStatus(EntityStatus status) {
this.status = status;
}
}
这可能是要筛选的代码:
public List<StatusEntity> filterByStates(final Set<EntityStatus> states) {
final Session hibernateSession = entityManager.unwrap(Session.class);
hibernateSession.enableFilter("byMultipleStates").setParameterList("states",
states.stream().map(state -> state.toString()).collect(Collectors.toList()));
final Query query = hibernateSession.createQuery("SELECT e FROM StatusEntity e");
return query.list();
}
公共列表过滤器系统状态(最终设置状态){
最终会话hibernateSession=entityManager.unwrap(Session.class);
hibernateSession.enableFilter(“ByMultipleEstates”).setParameterList(“状态”,
states.stream().map(state->state.toString()).collect(Collectors.toList());
final Query Query=hibernateSession.createQuery(“从状态实体e中选择e”);
返回query.list();
}
或者以Java 8之前的方式:
public List<StatusEntity> filterByStates(final Set<EntityStatus> states) {
final Set<String> statesAsString = new HashSet<>();
for (final EntityStatus state : states) {
statesAsString.add(state.toString());
}
final Session hibernateSession = entityManager.unwrap(Session.class);
hibernateSession.enableFilter("byMultipleStates").setParameterList("states", statesAsString);
final Query query = hibernateSession.createQuery("SELECT e FROM StatusEntity e");
return query.list();
}
公共列表过滤器系统状态(最终设置状态){
final Set statesAsString=new HashSet();
for(最终实体状态状态:状态){
statesAsString.add(state.toString());
}
最终会话hibernateSession=entityManager.unwrap(Session.class);
hibernateSession.enableFilter(“byMultipleStates”).setParameterList(“states”,statesAsString);
final Query Query=hibernateSession.createQuery(“从状态实体e中选择e”);
返回query.list();
}
因此,只过滤一组值是可能的