Topic: 问一个关于ResultSet的问题 |
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1.问一个关于ResultSet的问题 | Copy to clipboard |
Posted by: dwju Posted on: 2003-08-07 09:49 为什么数据库中没有记录的时候,使用ResultSet对象的isAfterLast()方法得出的结构却是FALSE,如果这样,我想判断一个ResultSet是否到最后应该怎么判断呢?郁闷!!! |
2.Re:问一个关于ResuleSet的问题 [Re: dwju] | Copy to clipboard |
Posted by: dwju Posted on: 2003-08-07 16:13 各位老大,有没有人会啊!!! |
3.Re:问一个关于ResuleSet的问题 [Re: dwju] | Copy to clipboard |
Posted by: dwju Posted on: 2003-08-07 16:34 人气好象不是太好啊! 晕~! 俺已经解决了! |
4.Re:问一个关于ResuleSet的问题 [Re: dwju] | Copy to clipboard |
Posted by: ditty Posted on: 2003-08-07 16:40 用next()方法就行了呀?何必? |
5.Re:问一个关于ResuleSet的问题 [Re: dwju] | Copy to clipboard |
Posted by: dwju Posted on: 2003-08-07 16:44 俺需要判断啊,不是做记录循环的……:( |
6.Re:问一个关于ResuleSet的问题 [Re: dwju] | Copy to clipboard |
Posted by: why Posted on: 2003-08-08 11:35 dwju wrote: ditty is right, next() is good enough for 判断... unless you meant something else. by the way, how do you 解决. please share your experience with everybody. |
7.Re:问一个关于ResultSet的问题 [Re: dwju] | Copy to clipboard |
Posted by: dwju Posted on: 2003-08-09 16:06 OK!星期一我贴上我的解决方法 |
8.Re:问一个关于ResultSet的问题 [Re: dwju] | Copy to clipboard |
Posted by: dwju Posted on: 2003-08-12 16:28 <%@ page contentType="text/html; charset=GBK" import="java.sql.*" %> <% String theType = request.getParameter("setType"); String theStr = "产品展示"; if(theType.equals("zzcp")) theStr="最新产品"; if(theType.equals("cxcp")) theStr="促销产品"; if(theType.equals("rxcp")) theStr="热销产品"; %> <jsp:useBean id="bean" scope="page" class="gcwd.DBConnection"/> <jsp:useBean id="strBean" scope="page" class="gcwd.StringBean"/> <% int rowCount=0; int intPage = 1; int pageCount =1; int pageSize =0; int j =1; String query=""; if(bean.dbConnection()) { /******************************************************** *这里根据前面传来不同的值,来判断SQL语句 *然后再执行查询,计算总行数和总的页数 ********************************************************/ if(theType.equals("zzcp")) query = "select top 100 spbm,spmc,spxh,jjsx,sbmc,jhdj,lsdj from kc_spzl order by czrq"; if(theType.equals("cxcp")) query = "select spbm,spmc,spxh,jjsx,sbmc,jhdj,lsdj from kc_spzl"; if(theType.equals("rxcp")) query = "select top 100 spbm,spmc,spxh,jjsx,sbmc,jhdj,lsdj from kc_spzl order by xxsl"; ResultSet resultset = bean.executeQuery(query); //out.println(query); if(!resultset.isAfterLast()) { resultset.last(); rowCount = resultset.getRow(); intPage = 1; //转化接收到的页面信息 String strPage = request.getParameter("page"); if(strPage==null) { intPage=1; } else { intPage = java.lang.Integer.parseInt(strPage); if(intPage<1) intPage=1; } pageSize = 13; pageCount = 0; //判断总页数,如果整除,则为整除结果,否则,就加一 if(rowCount / pageSize==0) pageCount = rowCount / pageSize; else pageCount = rowCount / pageSize + 1; //如果显示结果不够一页,则在将每页显示记录数设置为总记录数 if(rowCount < pageSize) pageSize = rowCount+1; if(intPage>pageCount) intPage=pageCount; j=(intPage-1)*pageSize+1; } %> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <link rel="stylesheet" href="css\css.css" type="text/css"> </head> <body bgcolor="#FFFFFF" text="#000000" scroll=no> <table width=620 border="0" cellspacing="0" cellpadding="0" bgcolor="#E1E1E1" class="frmBox" align="center"> <tr> <td bgcolor="#003399" height="20"></td> </tr> <tr> <td bgcolor="#999999" align=center> <table width="100%" border="0" cellspacing="0" cellpadding="1"> <tr> <td rowspan="2" align="center" width="16%"><img src="img/001.gif" width="32" height="32"></td> <td width="84%"><font color="#FFFFFF" size="+1"><b>产品展示</b></font></td> </tr> <tr> <td width="84%"><font color="#FFFFFF">-------<%out.println(theStr);%> </font></td> </tr> </table> </td> </tr> <tr bgcolor="#E1E1E1" height=20><td></td></tr> <tr><td align="center"> <table width=615> <tr> <td align="left"> </td> </tr> </table> <table width=615 border="0" cellspacing="1" cellpadding="0" style="border:2 inset;line-height:3.0" bgcolor="#CCCCCC" > <tr bgcolor="#E1E1E1"> <td width=10% class="ed_btnStyle"><Strong>编号</strong></td> <td width=25% class="ed_btnStyle"><Strong>名称</strong></td> <td width=10% class="ed_btnStyle"><Strong>型号</strong></td> <td width=10% class="ed_btnStyle"><Strong>商品规格</strong></td> <td width=15% class="ed_btnStyle"><Strong>生产厂家</strong></td> <td width=10% class="ed_btnStyle"><Strong>配送价</strong></td> <td width=10% class="ed_btnStyle"><Strong>零售价</strong></td> <td width=10% class="ed_btnStyle"><Strong>详细信息</strong></td> </tr> <% /*********************************************************** *利用前面求出的pageCount来为查询叶面分页 * 注意,后面翻页的时候,注意传递不同的查询类型值 ***********************************************************/ int i=0; resultset.absolute(j); while(i < pageSize && !resultset.isAfterLast()) { String changeSpbm=resultset.getString("spbm"); %> <tr bgcolor="#FFFFFF"> <td width=10% class="ed_btnStyle"><%=resultset.getString("spbm")%></td> <td width=25% class="ed_btnStyle"><%=strBean.changeString(resultset.getString("spmc"),0,11)%></td> <td width=10% class="ed_btnStyle"><%=resultset.getString("spxh")%></td> <td width=10% class="ed_btnStyle"><%=strBean.changeString(resultset.getString("jjsx"),0,6)%></td> <td width=15% class="ed_btnStyle"><%=strBean.changeString(resultset.getString("sbmc"),0,6)%></td> <td width=10% class="ed_btnStyle"><%=resultset.getString("jhdj")%></td> <td width=10% class="ed_btnStyle"><%=resultset.getString("lsdj")%></td> <td width=10% class="ed_btnStyle"><a href="list.jsp?changeValue=<%=changeSpbm%>">详细信息</a></td> </tr> <% i = i + 1; resultset.next(); } //while结束 } %> </table> <table width=100%> <tr> <td width="30%"> 第<%=intPage%>页/共<%=pageCount%>页 </td> <td width="70%" align="right"> <%if(intPage!=1){%> <a href="cpzs.jsp?page=1&setType=<%=theType%>">首页</a> <% } else { out.print("首页"); }%> <%if(intPage>1){%> <a href="cpzs.jsp?page=<%=intPage-1%>&setType=<%=theType%>">上一页</a> <% } else { out.print("上一页"); }%> <%if(intPage < pageCount){%> <a href="cpzs.jsp?page=<%=intPage+1%>&setType=<%=theType%>">下一页</a> <% } else { out.print("下一页"); }%> <%if(intPage!=pageCount){%> <a href="cpzs.jsp?page=<%=pageCount%>&setType=<%=theType%>">尾页</a> <% } else { out.print("尾页"); }%> </td> </tr> </table> </td> </tr> </table> </body> </html> |
9.Re:问一个关于ResultSet的问题 [Re: dwju] | Copy to clipboard |
Posted by: redmiddle Posted on: 2003-08-13 11:42 没有任何记录.又怎么可能有afterLast()了.你是resultSet的概念错误啦. 其实判断有没有到最后可以用isLast()就好了. |
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