hibernate配置enum枚举属性

LimitBy.java

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package com.ndkey.am.access.policy;

/**
 *
 * @author zxf
 */
public enum LimitBy {
    BY_USER,
    BY_TERMINAL
}

public class AccessDurationPolicy extends Policy {
    public static final int UNLIMITED_DURATION = 0;
    
    private int durationInMinutes;
    private LimitBy limitBy;

    public int getDurationInMinutes() {
        return durationInMinutes;
    }

    public void setDurationInMinutes(int durationInMinutes) {
        if (durationInMinutes < 0) {
            throw new IllegalArgumentException("时长不能小于0.");
        }
        this.durationInMinutes = durationInMinutes;
    }

    public LimitBy getLimitBy() {
        return limitBy;
    }

    public void setLimitBy(LimitBy limitBy) {
        this.limitBy = limitBy;
    }

<property column="limit_by" name="limitBy">
        <type name="org.hibernate.type.EnumType">
          <param name="enumClass">com.ndkey.am.access.policy.LimitBy</param>
          <param name="useNamed">true</param>
        </type>
      </property>