解决问题的工作是给我的
假设我有枚举类型管理和组织管理。所以我的问题是这样的
create type admins.admin_role as enum ('ADMIN','ORGANIZATION_ADMIN');
create table admins.admin (
admin_id uuid not null,
name text not null,
first_name text not null,
last_name text not null,
admin_role admins.admin_role,
created timestamp not null,
last_modified timestamp not null,
created_by uuid not null references admins.admin(admin_id) deferrable initially deferred,
last_modified_by uuid not null references admins.admin(admin_id) deferrable initially deferred,
delete boolean not null default false,
primary key (admin_id),
constraint empty_name_check check ((length(name) >= 1) and (name not like 'null')),
constraint empty_first_name_check check ((length(first_name) >= 1) and (name not like 'null')),
constraint empty_last_name_check check ((length(last_name) >= 1) and (name not like 'null'))
);
因此,要将其映射为Java枚举类型,我们需要添加一个类。我给了名EnumerationType,它扩展了org.hibernate.type.EnumType,并定义了nullSafeSet方法。
我的EnumerationType.java如下
package com.schoolmanager.postgres.type.enumeration;
import org.hibernate.HibernateException;
import org.hibernate.engine.spi.SessionImplementor;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Types;
public class EnumerationType extends org.hibernate.type.EnumType {
public void nullSafeSet(
PreparedStatement st,
Object value,
int index,
SessionImplementor session)
throws HibernateException, SQLException {
if (value == null) {
st.setNull(index, Types.OTHER);
} else {
st.setObject(index, value.toString(), Types.OTHER);
}
}
}
现在当我必须使用这种映射时,我需要添加typedef。首先我们需要在java中创建enum。
public enum AdminRole {
ADMIN("ADMIN"),
ORGANIZATION_ADMIN("ORGANIZATION_ADMIN");
private String value;
AdminRole(String value) {
this.value = value;
}
}
那么我们可以用下面这个。
@Entity
@Table(schema = "admins", name = "admin", uniqueConstraints = @UniqueConstraint(columnNames={"adminId"}))
@TypeDefs({
@TypeDef(name = "EnumerationType", typeClass = EnumerationType.class)
})
public class Admin {
private UUID adminId;
private String name;
private String firstName;
private String lastName;
private AdminRole adminRole;
private Date created;
private Date lastModified;
private UUID createdBy;
private UUID lastModifiedBy;
private boolean delete;
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
public UUID getAdminId() {
return adminId;
}
public void setAdminId(UUID adminId) {
this.adminId = adminId;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
@Basic
@Enumerated(EnumType.STRING)
@Type(type = "EnumerationType")
public AdminRole getAdminRole() {
return adminRole;
}
public void setAdminRole(AdminRole adminRole) {
this.adminRole = adminRole;
}
@Column(columnDefinition="TIMESTAMP DEFAULT CURRENT_TIMESTAMP")
@Temporal(TemporalType.TIMESTAMP)
public Date getCreated() {
return created;
}
public void setCreated(Date created) {
this.created = created;
}
@Column(columnDefinition="TIMESTAMP DEFAULT CURRENT_TIMESTAMP")
@Temporal(TemporalType.TIMESTAMP)
public Date getLastModified() {
return lastModified;
}
public void setLastModified(Date lastModified) {
this.lastModified = lastModified;
}
public UUID getCreatedBy() {
return createdBy;
}
public void setCreatedBy(UUID createdBy) {
this.createdBy = createdBy;
}
public UUID getLastModifiedBy() {
return lastModifiedBy;
}
public void setLastModifiedBy(UUID lastModifiedBy) {
this.lastModifiedBy = lastModifiedBy;
}
public boolean isDelete() {
return delete;
}
public void setDelete(boolean delete) {
this.delete = delete;
}
}
你需要添加typedef,比如
@类型定义({
@typedef(name=“EnumerationType”,typeClass=EnumerationType.Class)
})
然后您需要添加注释来将类与枚举类型关联起来,就像在我的例子中一样
@Basic
@Enumerated(EnumType.STRING)
@Type(type = "EnumerationType")
现在您可以将此数据保存在管理表中,其中管理角色是枚举类型。
