Hibernate enum_implements usertype, parameterizedtype-优快云博客

本文链接：https://blog.youkuaiyun.com/monkeyking1987/article/details/6674265

本文介绍了一种在Hibernate中自定义枚举类型的映射方式，通过实现UserType接口并结合hbm.xml配置文件，实现了枚举类型的持久化。这种方式能够有效解决不同数据库间枚举类型映射的问题。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

codes:

public class EnumUserType implements UserType, ParameterizedType {

    private static Logger log = Logger.getLogger(EnumUserType.class);

    private String enumClass;
    private Class clazz;

    /**
     * Init enum class
     *
     * @return Whether or not init success
     */
    private boolean initClass() {
        if (clazz == null) {
            try {
                clazz = Class.forName(enumClass);
                return true;
            } catch (ClassNotFoundException e) {
                if (log.isDebugEnabled()) {
                    log.debug("Can not found class: " + enumClass, e);
                }
                return false;
            }
        }
        return true;
    }

    public int[] sqlTypes() {
        return new int[]{Types.INTEGER};
    }

    public Class returnedClass() {
        if (initClass()) {
            return clazz;
        }
        return null;
    }

    public boolean equals(Object o, Object o1) throws HibernateException {
        return o == o1 || !(o == null || o1 == null) && o.equals(o1);
    }

    public int hashCode(Object o) throws HibernateException {
        return o.hashCode();
    }

    public Object nullSafeGet(ResultSet resultSet, String[] strings, Object o) throws HibernateException, SQLException {
        final int val = resultSet.getInt(strings[0]);
        Object obj = null;
        if (!resultSet.wasNull() && initClass()) {
            @SuppressWarnings("unchecked")
            EnumSet enumSet = EnumSet.allOf(clazz);
            for (Object object : enumSet) {
                if (object instanceof Enum) {
                    Enum e = (Enum) object;
                    if (e.ordinal() == val) {
                        obj = e;
                    }
                }
            }
        }
        return obj;
    }

    public void nullSafeSet(PreparedStatement preparedStatement, Object value, int index) throws HibernateException, SQLException {
        if (null == value) {
            preparedStatement.setNull(index, Types.INTEGER);
        } else {
            preparedStatement.setInt(index, ((Enum) value).ordinal());
        }
    }

    public Object deepCopy(Object o) throws HibernateException {
        return o;
    }

    public boolean isMutable() {
        return false;
    }

    public Serializable disassemble(Object o) throws HibernateException {
        return (Serializable) o;
    }

    public Object assemble(Serializable serializable, Object o) throws HibernateException {
        return serializable;
    }

    public Object replace(Object o, Object o1, Object o2) throws HibernateException {
        return o;
    }

    public String getEnumClass() {
        return enumClass;
    }

    public void setEnumClass(String enumClass) {
        this.enumClass = enumClass;
    }

    public void setParameterValues(Properties properties) {
        enumClass = properties.getProperty("enumClass");
    }
}

hbm.xml configure:

<property name="status" column="status">
            <type name="com.mkk.domain.usertype.EnumUserType">
                <param name="enumClass">
                    com.mkk.domain.PlanStatus
                </param>
            </type>
        </property>

可以直接复制下来使用, 映射的数据库类型为INT