请教一个在无限级分类树中的HQL语句

我的问题存在一个无级分类树中，因为对HQL语句不熟悉，所以想请

实际的sql语句如下：

select * from DictionaryLib where fk_dictionary_lib_parent_id is null and fk_dictionary_id=1

我尝试在createsqlquery中写如下代码，但是出错

java 代码

String sql="select {d.*} from DictionaryLib d where {d.fk_dictionary_lib_parent_id} is null and {d.fk_dictionary_id}="+String.valueOf(dictionaryId);

肯请指点

下面我解释一下我的表结构，相关的有两张，

一张是DictionaryLib（即字典库表），该表构成一棵无级分类的树

pk_dictionary_lib_id是主键

fk_dictionary_lib_parent_id是该类的父类的id,若为顶类则为null

fk_dictionary_id是表dictionary字典表的外键，通过这个外键可以知道，每个类属于哪个字典

java 代码

package com.lexus.bean;

import java.util.Date;
import java.util.HashSet;
import java.util.Set;


/**
 * AbstractDictionaryLib generated by MyEclipse - Hibernate Tools
 */

public abstract class AbstractDictionaryLib  implements java.io.Serializable {


    // Fields

     private Integer pkDictionaryLibId;
//该类的父结点对象
     private DictionaryLib dictionaryLib;
//该类关联的字典对象
     private Dictionary dictionary;
     private String name;
     private String description;
     private Integer sequence;
     private Short depth;
     private Date checkinTime;
     private Date updateTime;
     private Short version;
     private String status;
     private Set attachmentsForExtendName = new HashSet(0);
     private Set attachmentsForAttachmentType = new HashSet(0);
//该类子结点集
     private Set dictionaryLibs = new HashSet(0);


    // Constructors

    /** default constructor */
    public AbstractDictionaryLib() {
    }

    /** minimal constructor */
    public AbstractDictionaryLib(Dictionary dictionary, String name) {
        this.dictionary = dictionary;
        this.name = name;
    }

    /** full constructor */
    public AbstractDictionaryLib(DictionaryLib dictionaryLib, Dictionary dictionary, String name, String description, Integer sequence, Short depth, Date checkinTime, Date updateTime, Short version, String status, Set attachmentsForExtendName, Set attachmentsForAttachmentType, Set dictionaryLibs) {
        this.dictionaryLib = dictionaryLib;
        this.dictionary = dictionary;
        this.name = name;
        this.description = description;
        this.sequence = sequence;
        this.depth = depth;
        this.checkinTime = checkinTime;
        this.updateTime = updateTime;
        this.version = version;
        this.status = status;
        this.attachmentsForExtendName = attachmentsForExtendName;
        this.attachmentsForAttachmentType = attachmentsForAttachmentType;
        this.dictionaryLibs = dictionaryLibs;
    }


    // Property accessors

    public Integer getPkDictionaryLibId() {
        return this.pkDictionaryLibId;
    }

    public void setPkDictionaryLibId(Integer pkDictionaryLibId) {
        this.pkDictionaryLibId = pkDictionaryLibId;
    }

    public DictionaryLib getDictionaryLib() {
        return this.dictionaryLib;
    }

    public void setDictionaryLib(DictionaryLib dictionaryLib) {
        this.dictionaryLib = dictionaryLib;
    }

    public Dictionary getDictionary() {
        return this.dictionary;
    }

    public void setDictionary(Dictionary dictionary) {
        this.dictionary = dictionary;
    }

    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getDescription() {
        return this.description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public Integer getSequence() {
        return this.sequence;
    }

    public void setSequence(Integer sequence) {
        this.sequence = sequence;
    }

    public Short getDepth() {
        return this.depth;
    }

    public void setDepth(Short depth) {
        this.depth = depth;
    }

    public Date getCheckinTime() {
        return this.checkinTime;
    }

    public void setCheckinTime(Date checkinTime) {
        this.checkinTime = checkinTime;
    }

    public Date getUpdateTime() {
        return this.updateTime;
    }

    public void setUpdateTime(Date updateTime) {
        this.updateTime = updateTime;
    }

    public Short getVersion() {
        return this.version;
    }

    public void setVersion(Short version) {
        this.version = version;
    }

    public String getStatus() {
        return this.status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public Set getAttachmentsForExtendName() {
        return this.attachmentsForExtendName;
    }

    public void setAttachmentsForExtendName(Set attachmentsForExtendName) {
        this.attachmentsForExtendName = attachmentsForExtendName;
    }

    public Set getAttachmentsForAttachmentType() {
        return this.attachmentsForAttachmentType;
    }

    public void setAttachmentsForAttachmentType(Set attachmentsForAttachmentType) {
        this.attachmentsForAttachmentType = attachmentsForAttachmentType;
    }

    public Set getDictionaryLibs() {
        return this.dictionaryLibs;
    }

    public void setDictionaryLibs(Set dictionaryLibs) {
        this.dictionaryLibs = dictionaryLibs;
    }


}