Hibernate字段查询问题小记

我有一个实体类，包含了BLOB字段和集合属性字段，有时候查询希望排除BLOB字段和集合属性字段，有时候又希望只排除其中一个，这时问题就来了。
本来BLOB字段也可以设为lazy为true的，但是要做什么字节码强化，我想走走其他路子。
EntityBean

public class FormInfo {
	@Id
	@GeneratedValue(strategy=GenerationType.AUTO)
	//主键
	private long id;
	@Column(name="owner_id")
	//所有者主键
	private long ownerId;
	@Column(name="title_text",nullable=false)
	//标题
	private String titleText;
	@OneToMany(cascade={CascadeType.ALL}, fetch=FetchType.LAZY)
	@org.hibernate.annotations.Cascade(org.hibernate.annotations.CascadeType.DELETE_ORPHAN)
	@JoinColumn(name="forminfo_id")
	//字段
	private Set<FieldInfo> fields;
	@Basic(fetch=FetchType.LAZY)
	@Lob
	@Column(name="source_code",columnDefinition="CLOB")
	//表单源码
	private String sourceCode;
	@Column(name="table_name",unique=true,nullable=false)
	//数据表名
	private String tableName;
	@Column(name="create_time")
	//创建时间
	private Timestamp createTime;
	@Column(name="update_time")
	//修改时间
	private Timestamp updateTime;
	//描述
	private String description;
	//删除标记
	private boolean deleted;
	//锁定标记
	private boolean locked; 
	//完成标记
	private boolean completed;
	@Column(name="module_id")
	//模块主键
	private long moduleId;

	public FormInfo(){
		
	}
	//为HQL准备 日期类型改为java.util.Date类型，不然会报找不到构造方法异常
	public FormInfo(long id, long ownerId, String titleText,
			Set<FieldInfo> fields, String tableName, java.util.Date createTime,
			java.util.Date updateTime, String description, boolean deleted,
			boolean locked, boolean completed, long moduleId) {
		super();
		this.id = id;
		this.ownerId = ownerId;
		this.titleText = titleText;
		this.fields = fields;
		this.tableName = tableName;
		this.createTime = new java.sql.Timestamp(createTime.getTime());
		this.updateTime = new java.sql.Timestamp(updateTime.getTime());
		this.description = description;
		this.deleted = deleted;
		this.locked = locked;
		this.completed = completed;
		this.moduleId = moduleId;
	}

	public FormInfo(long id, long ownerId, String titleText, String tableName,
			java.util.Date createTime, java.util.Date updateTime, String description,
			boolean deleted, boolean locked, boolean completed, long moduleId) {
		super();
		this.id = id;
		this.ownerId = ownerId;
		this.titleText = titleText;
		this.tableName = tableName;
		this.createTime = new java.sql.Timestamp(createTime.getTime());
		this.updateTime = new java.sql.Timestamp(updateTime.getTime());
		this.description = description;
		this.deleted = deleted;
		this.locked = locked;
		this.completed = completed;
		this.moduleId = moduleId;
	}
//...省略getter、setter
}

BeanUtils

public class BeanUtils {
	
	private static Log logger = LogFactory.getLog(BeanUtils.class);
	
	/**
	 * @param entityClass 实体类
	 * @param prefix 前缀
	 * @param fields 要过滤的字段列表
	 * @return 返回逗号分隔的entityClass的所有声明字段，排除filters指定的字段
	 */
	public static String getFieldNames(Class entityClass, String prefix, String... filters){
		Field[] fs = entityClass.getDeclaredFields();
		StringBuilder sb = new StringBuilder();
		String p = prefix != null ? prefix : "";
		for(int i=0;i<fs.length;i++){
			Field f = fs[i];
			if(contains(f.getName(), filters)){
				continue;
			}
			if(i>0)sb.append(",");
			sb.append(p + f.getName());
		}
		return sb.toString();
	}
	
	private static boolean contains( String f, String... fs){
		if(fs == null)return false;
		boolean result = false;
		for(int i=0; i<fs.length; i++){
			if(fs[i].indexOf(",") != -1){
				return contains(f, fs[i].split(","));
			}else{
				if(f.equals(fs[i])){
					result = true;
					break;
				}
			}
		}
		return result;
	}
}

尝试一：HQL
super.find("select new FormInfo(" + BeanUtils.getFieldNames(FormInfo.class, "f.", "sourceCode") + ") from FormInfo f where f.completed = true");
生成SQL如下：
select
        forminfo0_.id as col_0_0_,
        forminfo0_.owner_id as col_1_0_,
        forminfo0_.title_text as col_2_0_,
        . as col_3_0_,
        forminfo0_.table_name as col_4_0_,
        forminfo0_.create_time as col_5_0_,
        forminfo0_.update_time as col_6_0_,
        forminfo0_.description as col_7_0_,
        forminfo0_.deleted as col_8_0_,
        forminfo0_.locked as col_9_0_,
        forminfo0_.completed as col_10_0_,
        forminfo0_.module_id as col_11_0_
    from
        t_bddz_forminfo forminfo0_
    inner join
        t_bddz_fieldinfo fields1_
            on forminfo0_.id=fields1_.forminfo_id
    where
        forminfo0_.completed=1
异常：org.hibernate.util.JDBCExceptionReporter,101 - ORA-00936: 缺失表达式
super.find("select new FormInfo(" + BeanUtils.getFieldNames(FormInfo.class, "f.", "sourceCode,fields") + ") from FormInfo f where f.completed = true");
生成SQL:
select
        forminfo0_.id as col_0_0_,
        forminfo0_.owner_id as col_1_0_,
        forminfo0_.title_text as col_2_0_,
        forminfo0_.table_name as col_3_0_,
        forminfo0_.create_time as col_4_0_,
        forminfo0_.update_time as col_5_0_,
        forminfo0_.description as col_6_0_,
        forminfo0_.deleted as col_7_0_,
        forminfo0_.locked as col_8_0_,
        forminfo0_.completed as col_9_0_,
        forminfo0_.module_id as col_10_0_
    from
        t_bddz_forminfo forminfo0_
    where
        forminfo0_.completed=1
异常：org.hibernate.QueryException: could not instantiate class [org.bsth.bddz.bean.FormInfo] from tuple
测试结果：失败，看来行不通了。


尝试二：用投影
public List<FormInfo> list(){
return super.findFieldsOfBean(BeanUtils.
getFieldNames(FormInfo.class, "", "sourceCode,fields").split(",")
, "completed", new Object[]{true});
}
一切正常
生成SQL：
select
        this_.id as y0_,
        this_.owner_id as y1_,
        this_.title_text as y2_,
        this_.table_name as y3_,
        this_.create_time as y4_,
        this_.update_time as y5_,
        this_.description as y6_,
        this_.deleted as y7_,
        this_.locked as y8_,
        this_.completed as y9_,
        this_.module_id as y10_
    from
        t_bddz_forminfo this_
    where
        this_.completed=?
如果改为:
public List<FormInfo> list(){
return super.findFieldsOfBean(BeanUtils.getFieldNames(FormInfo.class, "", "sourceCode").split(",")
, "completed", new Object[]{true});
}
并在findFieldsOfBean(...)方法中添加criteria.setFetchMode("fields", FetchMode.JOIN);
执行结果和SQL都同上一个一样，并没有把fields关联查询出来
看来在Hibernate中如果用了投影查询，FetchMode.JOIN就不起作用了

总结：目前还没解决即要排除BLOB字段又要关联集合属性字段的查询。