一个简单的EJB实例.用DB2连接.JSP页面.很好用.供大家学习

				package salesdb;
				/**
				 * Key class for Entity Bean: Item
				 */
				public class ItemKey implements java.io.Serializable {
					static final long serialVersionUID = 3206093459760846163L;
					/**
					 * Implementation field for persistent attribute: itemid
					 */
					public java.lang.Long itemid;
					/**
					 * Creates an empty key for Entity Bean: Item
					 */
					public ItemKey() {
					}
					/**
					 * Creates a key for Entity Bean: Item
					 */
					public ItemKey(java.lang.Long itemid) {
						this.itemid = itemid;
					}
					/**
					 * Returns true if both keys are equal.
					 */
					public boolean equals(java.lang.Object otherKey) {
						if (otherKey instanceof salesdb.ItemKey) {
							salesdb.ItemKey o = (salesdb.ItemKey) otherKey;
							return ((this.itemid.equals(o.itemid)));
						}
						return false;
					}
					/**
					 * Returns the hash code for the key.
					 */
					public int hashCode() {
						return (itemid.hashCode());
					}
					/**
					* Get accessor for persistent attribute: itemid
					*/
					public java.lang.Long getItemid() {
						return itemid;
					}
					/**
					* Set accessor for persistent attribute: itemid
					*/
					public void setItemid(java.lang.Long newItemid) {
						itemid = newItemid;
					}
				}