如何使用JPA和Hibernate映射PostgreSQL枚举

我正在尝试将名为transmission_result的postgres自定义类型映射到Hibernate / JPA POJO. postgres自定义类型或多或少是枚举类型的字符串值.

我创建了一个名为PGEnumUserType的自定义EnumUserType以及一个表示postgres枚举值的枚举类.当我针对真实数据库运行此操作时,收到以下错误：
‘ERROR：column“status”的类型为transmission_result,但表达式的类型为字符变化
  提示：您需要重写或转换表达式.
  位置：135′

看到这个,我想我需要将我的sqlTypes更改为Types.OTHER.但这样做会破坏我的集成测试(在内存数据库中使用Hypersql)：
‘引起：java.sql.sqlException：在语句中找不到表[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 _.“transmit”as transmit8_47_0_ from“transmitting”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 / Hibernate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EnumUserType：

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}

解决方法:

我想到了.我需要在nullSafeset函数中使用setobject而不是setString,并将Types.OTHER作为java.sql.type传入,让jdbc知道它是postgres类型.

public void nullSafeSet(PreparedStatement st, Object value, int index) throws HibernateException, sqlException {
    if (value == null) {
        st.setNull(index, Types.VARCHAR);
    }
    else {
//            prevIoUsly used setString, but this causes postgresql to bark about incompatible types.
//           Now using setobject passing in the java type for the postgres enum object
//            st.setString(index,((Enum) value).name());
        st.setobject(index,((Enum) value), Types.OTHER);
    }
}