我有以下Oracle表定义。
CREATE TABLE "SIAS"."OPERATION_REG"
(
"ID" NUMBER CONSTRAINT "CT_OPERATION_REG_ID" NOT NULL ENABLE,
"OPERATION_NAME" VARCHAR2(30 BYTE),
"APPLICATION_NAME" VARCHAR2(30 BYTE),
"EXECUTION_DATE" DATE,
"EXECUTION_USER" VARCHAR2(80 BYTE),
"RESULT" VARCHAR2(20 BYTE),
CONSTRAINT "PK_OPERATION_REG_ID" PRIMARY KEY ("ID") USING INDEX PCTFREE 10
INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS NOLOGGING STORAGE(INITIAL 65536 NEXT
1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST
GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
TABLESPACE "SIAS_DAT" ENABLE
)
SEGMENT CREATION IMMEDIATE PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255
NOCOMPRESS LOGGING STORAGE
(
INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE
0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT
CELL_FLASH_CACHE DEFAULT
)
TABLESPACE "SIAS_DAT" ;
CREATE UNIQUE INDEX "SIAS"."IDX_OPERATION_REG_ID" ON "SIAS"."OPERATION_REG"
(
"ID"
)
PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS NOLOGGING STORAGE
(
INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0
FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT
CELL_FLASH_CACHE DEFAULT
)
TABLESPACE "SIAS_DAT" ;
CREATE OR REPLACE TRIGGER "SIAS"."BI_OPERATION_REG" BEFORE
INSERT ON OPERATION_REG REFERENCING NEW AS NEW OLD AS OLD FOR EACH ROW BEGIN
:NEW.ID := SEQ_OPERATION_REG.NEXTVAL;
EXCEPTION
WHEN OTHERS THEN
RAISE_APPLICATION_ERROR
(
-20255, 'ERROR EN TRIGGER BI_OPERATION_REG'
)
;
END;
/
ALTER TRIGGER "SIAS"."BI_OPERATION_REG" ENABLE;
启用此触发器可在创建新行时自动生成 ID 列的值。
create or replace
TRIGGER BI_OPERATION_REG BEFORE INSERT
ON OPERATION_REG
REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW
BEGIN
:NEW.ID := SEQ_OPERATION_REG.NEXTVAL;
EXCEPTION
WHEN OTHERS
THEN
RAISE_APPLICATION_ERROR (-20255, 'ERROR EN TRIGGER BI_OPERATION_REG');
END;
这是生成 ID
值的序列定义CREATE SEQUENCE "SIAS"."SEQ_OPERATION_REG" MINVALUE 1 MAXVALUE
999999999999999999999999999 INCREMENT BY 1 START WITH 37 NOCACHE NOORDER NOCYCLE ;
我无法控制数据库，因为DBA团队超出了我的范围，因此我必须处理这些定义。我创建了一个映射OPERATION_REG表的JPA实体。这是列ID的ID属性方法映射。
@Id
@GeneratedValue(strategy = GenerationType.AUTO, generator = "G1")
@SequenceGenerator(name = "G1", sequenceName = "SEQ_OPERATION_REG")
@Column(name = "ID")
public int getId() {
return id;
}
这是我的实体映射的完整代码
import org.hibernate.annotations.GenericGenerator;
import javax.persistence.*;
import java.sql.Timestamp;
import java.util.Collection;
@Entity
@Table(name = "OPERATION_REG")
public class OperationRegEntity extends BaseEntity {
private int id;
private String operationName;
private String applicationName;
private Timestamp executionDate;
private String executionUser;
private String result;
private Collection<TokenRegEntity> tokenRegsById;
private Collection<TraceRegEntity> traceRegsById;
@Id
@GeneratedValue(generator="select-generator")
@GenericGenerator(name="select-generator", strategy="select", parameters = @org.hibernate.annotations.Parameter(name="key", value="ID"))
// @GeneratedValue(strategy = GenerationType.AUTO, generator = "G1")
// @SequenceGenerator(name = "G1", sequenceName = "SEQ_OPERATION_REG")
@Column(name = "ID")
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Basic
@Column(name = "OPERATION_NAME")
public String getOperationName() {
return operationName;
}
public void setOperationName(String operationName) {
this.operationName = operationName;
}
@Basic
@Column(name = "APPLICATION_NAME")
public String getApplicationName() {
return applicationName;
}
public void setApplicationName(String applicationName) {
this.applicationName = applicationName;
}
@Basic
@Column(name = "EXECUTION_DATE")
public Timestamp getExecutionDate() {
return executionDate;
}
public void setExecutionDate(Timestamp executionDate) {
this.executionDate = executionDate;
}
@Basic
@Column(name = "EXECUTION_USER")
public String getExecutionUser() {
return executionUser;
}
public void setExecutionUser(String executionUser) {
this.executionUser = executionUser;
}
@Basic
@Column(name = "RESULT")
public String getResult() {
return result;
}
public void setResult(String result) {
this.result = result;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
OperationRegEntity that = (OperationRegEntity) o;
if (id != that.id) return false;
if (applicationName != null ? !applicationName.equals(that.applicationName) : that.applicationName != null)
return false;
if (executionDate != null ? !executionDate.equals(that.executionDate) : that.executionDate != null)
return false;
if (executionUser != null ? !executionUser.equals(that.executionUser) : that.executionUser != null)
return false;
if (operationName != null ? !operationName.equals(that.operationName) : that.operationName != null)
return false;
if (result != null ? !result.equals(that.result) : that.result != null) return false;
return true;
}
@Override
public int hashCode() {
int result1 = id;
result1 = 31 * result1 + (operationName != null ? operationName.hashCode() : 0);
result1 = 31 * result1 + (applicationName != null ? applicationName.hashCode() : 0);
result1 = 31 * result1 + (executionDate != null ? executionDate.hashCode() : 0);
result1 = 31 * result1 + (executionUser != null ? executionUser.hashCode() : 0);
result1 = 31 * result1 + (result != null ? result.hashCode() : 0);
return result1;
}
@OneToMany(mappedBy = "operationRegByOperationRegId")
public Collection<TokenRegEntity> getTokenRegsById() {
return tokenRegsById;
}
public void setTokenRegsById(Collection<TokenRegEntity> tokenRegsById) {
this.tokenRegsById = tokenRegsById;
}
@OneToMany(mappedBy = "operationRegByOperationRegId")
public Collection<TraceRegEntity> getTraceRegsById() {
return traceRegsById;
}
public void setTraceRegsById(Collection<TraceRegEntity> traceRegsById) {
this.traceRegsById = traceRegsById;
}
}
我遇到了问题，因为当我创建一个新对象并将其保留在数据库上时，我会遵循这个策略
@Autowired
OperationRegService operationregservice;
@Transactional(propagation = Propagation.REQUIRES_NEW)
public OperationRegEntity createOperationReg(GenericRequestParameters parameters) {
OperationRegEntity oper = new OperationRegEntity();
oper.setApplicationName(parameters.getApplication());
oper.setExecutionUser(parameters.getApplicationUser());
oper.setOperationName(parameters.getSIASOperationName());
oper.setExecutionDate(new Timestamp(Calendar.getInstance().getTime().getTime()));
oper.setResult("INITIATED");
operationregservice.persist(oper);
return oper;
}
当我分析 oper.getID（）的信息时，该值与数据库中创建的实际值不同，特别是总是低于1点。例如，java实体的ID值为 34 ，表行实体的ID值为 35 ，就像序列被调用两次一样。有什么想法吗？
答案 0 :(得分：2)
你不应该使用@SequenceGenerator，因为当你希望Hibernate在持久化实体时调用序列时会使用它。
在您的用例中，数据库会进行调用，因此您需要使用select identifier generator strategy：
@Id
@GeneratedValue(generator="select-generator")
@GenericGenerator(name="select-generator",
strategy="select",
parameters = @org.hibernate.annotations.Parameter(name="key", value="ID")
)
@Column(name = "ID")
public int getId() {
return id;
}
答案 1 :(得分：0)
好的，我找出了问题所在，这就是触发器生成序列的方式。关键是生成序列如果没有设置ID值。这样，Hibernate将调用序列，设置ID值，触发器将检查值是否已设置，如果是，则不会调用序列。如果未设置任何值，则触发器调用序列并设置值
这是有效的触发器
create or replace
TRIGGER BI_OPERATION_REG BEFORE INSERT
ON OPERATION_REG
REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW
BEGIN
IF :NEW.ID IS NULL THEN SELECT SEQ_OPERATION_REG.NEXTVAL INTO :NEW.ID FROM dual; END IF;
EXCEPTION
WHEN OTHERS
THEN
RAISE_APPLICATION_ERROR (-20255, 'ERROR EN TRIGGER BI_OPERATION_REG');
END;