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.websphere_deploy.DB2UDBNT_V8_1;								/**				 * PurchaseBeanExtractor_e813240d				 */				public class PurchaseBeanExtractor_e813240d extends com.ibm.ws.ejbpersistence.dataaccess.AbstractEJBExtractor {					/**					 * PurchaseBeanExtractor_e813240d					 */					public PurchaseBeanExtractor_e813240d() {						int[] pkCols={1};						setPrimaryKeyColumns(pkCols);										int[] dataCols={1,2,3,4};						setDataColumns(dataCols);					}					/**					 * extractData					 */					public com.ibm.ws.ejbpersistence.cache.DataCacheEntry extractData(com.ibm.ws.ejbpersistence.dataaccess.RawBeanData dataRow) throws com.ibm.ws.ejbpersistence.utilpm.ErrorProcessingResultCollectionRow, com.ibm.ws.ejbpersistence.utilpm.PersistenceManagerInternalError {						int[] dataColumns = getDataColumns();										salesdb.websphere_deploy.DB2UDBNT_V8_1.PurchaseBeanCacheEntryImpl_e813240d entry=							new salesdb.websphere_deploy.DB2UDBNT_V8_1.PurchaseBeanCacheEntryImpl_e813240d();										entry.setDataForPURCHASEID(dataRow.getLong(dataColumns[0]), dataRow.wasNull());						entry.setDataForTIMESTMP(dataRow.getString(dataColumns[1]));						entry.setDataForITEMID(dataRow.getLong(dataColumns[2]), dataRow.wasNull());						entry.setDataForLOCATIONID(dataRow.getString(dataColumns[3]));										return entry;					}					/**					 * extractPrimaryKey					 */					public Object extractPrimaryKey(com.ibm.ws.ejbpersistence.dataaccess.RawBeanData dataRow) throws com.ibm.ws.ejbpersistence.utilpm.ErrorProcessingResultCollectionRow, com.ibm.ws.ejbpersistence.utilpm.PersistenceManagerInternalError {						int[] primaryKeyColumns = getPrimaryKeyColumns();										salesdb.PurchaseKey key=							new salesdb.PurchaseKey();										key.purchaseid=new Long(dataRow.getLong(primaryKeyColumns[0]));										return key;					}					/**					 * getHomeName					 */					public String getHomeName() {						return "Purchase";					}					/**					 * getChunkLength					 */					public int getChunkLength() {						return 4;					}				}