今天编码日志小结

1、把POJO里的 注册时间  属性写成registerTime的时候
结果发现当数据库里面这一个字段非空的时候,查询的时候总是会有异常..
搞了很久才知道,下次有用这一个字段作属性的话,也留意一些..
应该是hibernate保留的字段,不过我忘记了,不知道在第几页了,明天查一下

2、不要轻易地升级开源的lib包
今天试着把commons-validator要升级到1.3版本的,结果出现了一些错误，搞了一番，才知道为什么，后来用回旧版本的1.1.3版本的

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2 楼 一衣带水 2007-05-12  

一个hibernate的POJO文件:
BaseKind文件

import java.lang.Comparable;
import java.io.Serializable;
import java.util.HashSet;


/**
 * This is an object that contains data related to the kind table.
 * Do not modify this class because it will be overwritten if the configuration file
 * related to this class is modified.
 *
 * @hibernate.class
 *  table="kind"
 */

public abstract class BaseKind  implements Comparable, Serializable {

	public static String REF = "Kind";
	public static String PROP_KIND_DESC = "KindDesc";
	public static String PROP_KIND_NAME = "KindName";
	public static String PROP_ID = "Id";


	// constructors
	public BaseKind () {
		initialize();
	}

	/**
	 * Constructor for primary key
	 */
	public BaseKind (java.lang.Integer id) {
		this.setId(id);
		initialize();
	}

	/**
	 * Constructor for required fields
	 */
	public BaseKind (
		java.lang.Integer id,
		java.lang.String kindName,
		java.lang.String kindDesc) {

		this.setId(id);
		this.setKindName(kindName);
		this.setKindDesc(kindDesc);
		initialize();
	}

	protected void initialize () {}



	private int hashCode = Integer.MIN_VALUE;

	// primary key
	private java.lang.Integer id;

	// fields
	private java.lang.String kindName;
	private java.lang.String kindDesc;

	// collections
	private java.util.Set items = new HashSet();



	/**
	 * Return the unique identifier of this class
     * @hibernate.id
     *  generator-class="increment"
     *  column="kind_id"
     */
	public java.lang.Integer getId () {
		return id;
	}

	/**
	 * Set the unique identifier of this class
	 * @param id the new ID
	 */
	public void setId (java.lang.Integer id) {
		this.id = id;
		this.hashCode = Integer.MIN_VALUE;
	}




	/**
	 * Return the value associated with the column: kind_name
	 */
	public java.lang.String getKindName () {
		return kindName;
	}

	/**
	 * Set the value related to the column: kind_name
	 * @param kindName the kind_name value
	 */
	public void setKindName (java.lang.String kindName) {
		this.kindName = kindName;
	}



	/**
	 * Return the value associated with the column: kind_desc
	 */
	public java.lang.String getKindDesc () {
		return kindDesc;
	}

	/**
	 * Set the value related to the column: kind_desc
	 * @param kindDesc the kind_desc value
	 */
	public void setKindDesc (java.lang.String kindDesc) {
		this.kindDesc = kindDesc;
	}



	/**
	 * Return the value associated with the column: Items
	 */
	public java.util.Set getItems () {
		return items;
	}

	/**
	 * Set the value related to the column: Items
	 * @param items the Items value
	 */
	public void setItems (java.util.Set items) {
		this.items = items;
	}


	public boolean equals (Object obj) {
		if (null == obj) return false;
		if (!(obj instanceof org.yeeku.model.Kind)) return false;
		else {
			org.yeeku.model.Kind kind = (org.yeeku.model.Kind) obj;
			if (null == this.getId() || null == kind.getId()) return false;
			else return (this.getId().equals(kind.getId()));
		}
	}

	public int hashCode () {
		if (Integer.MIN_VALUE == this.hashCode) {
			if (null == this.getId()) return super.hashCode();
			else {
				String hashStr = this.getClass().getName() + ":" + this.getId().hashCode();
				this.hashCode = hashStr.hashCode();
			}
		}
		return this.hashCode;
	}

	public int compareTo (Object obj) {
		if (obj.hashCode() > hashCode()) return 1;
		else if (obj.hashCode() < hashCode()) return -1;
		else return 0;
	}

	public String toString () {
		return super.toString();
	}


}

Kind文件

import org.yeeku.model.base.BaseKind;

public class Kind extends BaseKind {
	private static final long serialVersionUID = 1L;

/*[CONSTRUCTOR MARKER BEGIN]*/
	public Kind () {
		super();
	}

	/**
	 * Constructor for primary key
	 */
	public Kind (java.lang.Integer id) {
		super(id);
	}

	/**
	 * Constructor for required fields
	 */
	public Kind (
		java.lang.Integer id,
		java.lang.String kindName,
		java.lang.String kindDesc) {

		super (
			id,
			kindName,
			kindDesc);
	}

/*[CONSTRUCTOR MARKER END]*/

	public void addItem (org.yeeku.model.Item item) {
		item.setKind(this);
	}
}

1 楼 mathsfan 2007-01-19  

顶一下，第二点说的很对哈，上次我就升级了一个tomcat的什么东西就出现错误了```