【发布时间】：2023-03-20 21:32:01
【问题描述】：
我正在尝试将名为 transmission_result 的 PostgreSQL 自定义类型映射到 Hibernate/JPA POJO。 PostgreSQL 自定义类型或多或少是enum 类型的字符串值。
我创建了一个名为 PGEnumUserType 的自定义 EnumUserType 以及一个代表 PostgreSQL 枚举值的 enum 类。当我在真实数据库上运行它时，我收到以下错误：
'ERROR: column "status" is of type transmission_result but expression is of type
character varying
Hint: You will need to rewrite or cast the expression.
Position: 135 '
看到这个，我想我需要将我的SqlTypes 更改为Types.OTHER。但是这样做会破坏我的集成测试（在内存数据库中使用 HyperSQL）并显示以下消息：
'Caused by: java.sql.SQLException: Table not found in statement
[select enrollment0_."id" as id1_47_0_,
enrollment0_."tpa_approval_id" as tpa2_47_0_,
enrollment0_."tpa_status_code" as tpa3_47_0_,
enrollment0_."status_message" as status4_47_0_,
enrollment0_."approval_id" as approval5_47_0_,
enrollment0_."transmission_date" as transmis6_47_0_,
enrollment0_."status" as status7_47_0_,
enrollment0_."transmitter" as transmit8_47_0_
from "transmissions" enrollment0_ where enrollment0_."id"=?]'
我不确定为什么更改 sqlType 会导致此错误。任何帮助表示赞赏。
JPA/休眠实体：
@Entity
@Access(javax.persistence.AccessType.PROPERTY)
@Table(name="transmissions")
public class EnrollmentCycleTransmission {
// elements of enum status column
private static final String ACCEPTED_TRANSMISSION = "accepted";
private static final String REJECTED_TRANSMISSION = "rejected";
private static final String DUPLICATE_TRANSMISSION = "duplicate";
private static final String EXCEPTION_TRANSMISSION = "exception";
private static final String RETRY_TRANSMISSION = "retry";
private Long transmissionID;
private Long approvalID;
private Long transmitterID;
private TransmissionStatusType transmissionStatus;
private Date transmissionDate;
private String TPAApprovalID;
private String TPAStatusCode;
private String TPAStatusMessage;
@Column(name = "id")
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
public Long getTransmissionID() {
return transmissionID;
}
public void setTransmissionID(Long transmissionID) {
this.transmissionID = transmissionID;
}
@Column(name = "approval_id")
public Long getApprovalID() {
return approvalID;
}
public void setApprovalID(Long approvalID) {
this.approvalID = approvalID;
}
@Column(name = "transmitter")
public Long getTransmitterID() {
return transmitterID;
}
public void setTransmitterID(Long transmitterID) {
this.transmitterID = transmitterID;
}
@Column(name = "status")
@Type(type = "org.fuwt.model.PGEnumUserType" , parameters ={@org.hibernate.annotations.Parameter(name = "enumClassName",value = "org.fuwt.model.enrollment.TransmissionStatusType")} )
public TransmissionStatusType getTransmissionStatus() {
return this.transmissionStatus ;
}
public void setTransmissionStatus(TransmissionStatusType transmissionStatus) {
this.transmissionStatus = transmissionStatus;
}
@Column(name = "transmission_date")
public Date getTransmissionDate() {
return transmissionDate;
}
public void setTransmissionDate(Date transmissionDate) {
this.transmissionDate = transmissionDate;
}
@Column(name = "tpa_approval_id")
public String getTPAApprovalID() {
return TPAApprovalID;
}
public void setTPAApprovalID(String TPAApprovalID) {
this.TPAApprovalID = TPAApprovalID;
}
@Column(name = "tpa_status_code")
public String getTPAStatusCode() {
return TPAStatusCode;
}
public void setTPAStatusCode(String TPAStatusCode) {
this.TPAStatusCode = TPAStatusCode;
}
@Column(name = "status_message")
public String getTPAStatusMessage() {
return TPAStatusMessage;
}
public void setTPAStatusMessage(String TPAStatusMessage) {
this.TPAStatusMessage = TPAStatusMessage;
}
}
自定义枚举用户类型：
public class PGEnumUserType implements UserType, ParameterizedType {
private Class<Enum> enumClass;
public PGEnumUserType(){
super();
}
public void setParameterValues(Properties parameters) {
String enumClassName = parameters.getProperty("enumClassName");
try {
enumClass = (Class<Enum>) Class.forName(enumClassName);
} catch (ClassNotFoundException e) {
throw new HibernateException("Enum class not found ", e);
}
}
public int[] sqlTypes() {
return new int[] {Types.VARCHAR};
}
public Class returnedClass() {
return enumClass;
}
public boolean equals(Object x, Object y) throws HibernateException {
return x==y;
}
public int hashCode(Object x) throws HibernateException {
return x.hashCode();
}
public Object nullSafeGet(ResultSet rs, String[] names, Object owner) throws HibernateException, SQLException {
String name = rs.getString(names[0]);
return rs.wasNull() ? null: Enum.valueOf(enumClass,name);
}
public void nullSafeSet(PreparedStatement st, Object value, int index) throws HibernateException, SQLException {
if (value == null) {
st.setNull(index, Types.VARCHAR);
}
else {
st.setString(index,((Enum) value).name());
}
}
public Object deepCopy(Object value) throws HibernateException {
return value;
}
public boolean isMutable() {
return false; //To change body of implemented methods use File | Settings | File Templates.
}
public Serializable disassemble(Object value) throws HibernateException {
return (Enum) value;
}
public Object assemble(Serializable cached, Object owner) throws HibernateException {
return cached;
}
public Object replace(Object original, Object target, Object owner) throws HibernateException {
return original;
}
public Object fromXMLString(String xmlValue) {
return Enum.valueOf(enumClass, xmlValue);
}
public String objectToSQLString(Object value) {
return '\'' + ( (Enum) value ).name() + '\'';
}
public String toXMLString(Object value) {
return ( (Enum) value ).name();
}
}
枚举类：
public enum TransmissionStatusType {
accepted,
rejected,
duplicate,
exception,
retry}
【问题讨论】：
-
也可能是由于没有从枚举转换为 varchar！
标签： java postgresql hibernate jpa enums