?? editbookaction.java
字號:
package bookstore;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;
import org.hibernate.Query;
import org.hibernate.Session;
import bookstore.database.Bookinfo;
import bookstore.database.HibernateUtil;
public class EditBookAction extends Action {
public ActionForward execute(ActionMapping mapping, ActionForm srcForm,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
ActionMessages errors = new ActionMessages();
Session dbSession = HibernateUtil.currentSession();
// 查詢傳入的圖書id,如果id在數據庫中不存在則認為用戶是在添加新數據
Bookinfo book;
try {
int bookid = Integer.parseInt(request.getParameter("bookid"));
HibernateUtil.beginTransaction();
Query query = dbSession
.createQuery(" from Bookinfo as b where b.id=:id");
query.setInteger("id", bookid);
List result = query.list();
HibernateUtil.commitTransaction();
if (result.size() != 0) {
book = (Bookinfo) result.get(0);
} else {
book = new Bookinfo();
book.setId(new Integer(0));
}
} catch (Exception e) {
errors.add("wrongid", new ActionMessage("editbook.wrongid"));
this.saveErrors(request, errors);
return mapping.findForward("errorPage");
}
request.setAttribute("book", book);
return mapping.findForward("editBook");
}
}
?? 快捷鍵說明
復制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -