【发布时间】：2020-11-24 10:08:51
【问题描述】：
我想根据它们的相对 ID 选择三个数据库。
您有一个名为 sms_templates 的主表：
CREATE TABLE public.sms_templates
(
id integer NOT NULL DEFAULT nextval('sms_templates_id_seq'::regclass),
name character varying(150) COLLATE pg_catalog."default" NOT NULL,
has_variables boolean NOT NULL DEFAULT false,
default_label text COLLATE pg_catalog."default" NOT NULL,
created_at timestamp without time zone NOT NULL DEFAULT now(),
updated_at timestamp without time zone NOT NULL DEFAULT now(),
CONSTRAINT sms_templates_pkey PRIMARY KEY (id)
)
短信模板语言：
CREATE TABLE public.sms_template_languages
(
id integer NOT NULL DEFAULT nextval('sms_template_languages_id_seq'::regclass),
sms_template_id integer NOT NULL,
language_id integer NOT NULL,
label text COLLATE pg_catalog."default" NOT NULL,
created_at timestamp without time zone NOT NULL DEFAULT now(),
updated_at timestamp without time zone NOT NULL DEFAULT now(),
CONSTRAINT sms_template_languages_pkey PRIMARY KEY (id),
CONSTRAINT sms_template_languages_language_id_fkey FOREIGN KEY (language_id)
REFERENCES public.languages (id) MATCH SIMPLE
ON UPDATE NO ACTION
ON DELETE CASCADE,
CONSTRAINT sms_template_languages_sms_template_id_fkey FOREIGN KEY (sms_template_id)
REFERENCES public.sms_templates (id) MATCH SIMPLE
ON UPDATE NO ACTION
ON DELETE CASCADE
)
最后是语言表：
CREATE TABLE public.languages
(
id integer NOT NULL DEFAULT nextval('languages_id_seq'::regclass),
name character varying(5) COLLATE pg_catalog."default" NOT NULL,
created_at timestamp without time zone NOT NULL DEFAULT now(),
updated_at timestamp without time zone NOT NULL DEFAULT now(),
CONSTRAINT languages_pkey PRIMARY KEY (id)
)
我已经创建了它们单独的实体/存储库，当我将 sms_templates 表与 sms_template_languages 连接时，一切正常。但是，一旦我加入语言表以便获得值，一切都开始崩溃，最终出现以下错误：
[org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: Could not set field value [LanguageEntity(id=2, code=null, createdAt=null, updatedAt=null)] value by reflection : [class com.packagename.SMSTemplateLanguage.Entity.SMSTemplateLanguageEntity.languageEntitySet] setter of com.packagename.SMSTemplateLanguage.Entity.SMSTemplateLanguageEntity.languageEntitySet;
我的实体：
@Entity
@Table(name = "sms_templates")
@Data
public class SMSTemplateEntity {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column
private String name;
@Column(name="has_variables")
private Boolean hasVariables;
@Column(name = "default_label")
private String defaultLabel;
@Column(name = "created_at")
private Timestamp createdAt;
@Column(name = "updated_at")
private Timestamp updatedAt;
@OneToMany(targetEntity = SMSTemplateVariableEntity.class)
@JoinColumn(name = "sms_template_id")
private Set<SMSTemplateVariables> variableNames;
@OneToMany(targetEntity = SMSTemplateLanguageEntity.class)
@JoinColumn(name = "sms_template_id")
private Set<SMSTemplateLanguageEntity> templateLanguage;
@PrePersist
public void prePersist() {
this.createdAt = new Timestamp((System.currentTimeMillis()));
this.updatedAt = new Timestamp((System.currentTimeMillis()));
}
@PreUpdate
public void preUpdate() {
this.updatedAt = new Timestamp((System.currentTimeMillis()));
}
}
@Entity
@Table(name = "sms_template_variables")
@Data
public class SMSTemplateVariableEntity {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(name = "sms_template_id")
private Long smsTemplateId;
@Column(name = "variable_name")
private String variableName;
@Column(name = "created_at")
@JsonIgnore
private Timestamp createdAt;
@JsonIgnore
@Column(name = "updated_at")
private Timestamp updatedAt;
@PrePersist
public void prePersist() {
this.createdAt = new Timestamp((System.currentTimeMillis()));
this.updatedAt = new Timestamp((System.currentTimeMillis()));
}
@PreUpdate
public void preUpdate() {
this.updatedAt = new Timestamp((System.currentTimeMillis()));
}
}
@Entity
@Data
@Table(name = "sms_template_languages")
public class SMSTemplateLanguageEntity {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(name = "sms_template_id")
private Long smsTemplateId;
@Column
private String label;
@Column(name = "created_at")
@JsonIgnore
private Timestamp createdAt;
@Column(name = "updated_at")
@JsonIgnore
private Timestamp updatedAt;
@OneToOne(targetEntity = LanguageEntity.class)
@JoinColumn(name = "language_id")
private Set<LanguageEntity> languageEntitySet;
@PrePersist
public void prePersist() {
this.createdAt = new Timestamp((System.currentTimeMillis()));
this.updatedAt = new Timestamp((System.currentTimeMillis()));
}
@PreUpdate
public void preUpdate() {
this.updatedAt = new Timestamp((System.currentTimeMillis()));
}
}
@Data
@Entity
@Table(name = "languages")
public class LanguageEntity {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(name = "name")
private String code;
@Column(name = "created_at")
@JsonIgnore
private Timestamp createdAt;
@JsonIgnore
@Column(name = "updated_at")
private Timestamp updatedAt;
@PrePersist
public void prePersist() {
this.createdAt = new Timestamp((System.currentTimeMillis()));
this.updatedAt = new Timestamp((System.currentTimeMillis()));
}
@PreUpdate
public void preUpdate() {
this.updatedAt = new Timestamp((System.currentTimeMillis()));
}
}
我的主要仓库：
@Repository
public interface SMSTemplateRepository extends CrudRepository<SMSTemplateEntity, Long> {
@Query(value = "SELECT new com.montymobile.parentalControlPortal.SMSTemplate.DTOs.SMSTemplateDTO " +
"(st) FROM SMSTemplateEntity st")
List<SMSTemplateDTO> getTemplates();
}
负责的 DTO：
@Data
public class SMSTemplateDTO {
private Long id;
private String name;
private Set<SMSTemplateVariables> variableNames;
private Set<SMSTemplateLanguageEntity> languageEntities;
public SMSTemplateDTO() {
}
public SMSTemplateDTO(SMSTemplateEntity smsTemplateEntity) {
this.id = smsTemplateEntity.getId();
this.name = smsTemplateEntity.getName();
this.variableNames = smsTemplateEntity.getVariableNames();
this.languageEntities = smsTemplateEntity.getTemplateLanguage();
}
}
是我混淆了关系还是我的 Java 代码中遗漏了某个部分？
【问题讨论】：
标签： java postgresql spring-boot