📄 upddata.jsp
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<%@ page contentType="text/html; charset=GB2312" %>
<%@ page import="java.sql.*" %>
<%@ page language="java" %>
<%@ include file="Conn.jsp" %>
<HTML>
<HEAD>
<TITLE>修改数据</TITLE>
</HEAD>
<BODY>
<CENTER>
<FONT SIZE = 5 COLOR = blue>修改数据</FONT>
</CENTER>
<BR>
<HR>
<BR>
<%
String Submit = request.getParameter("submit1"); //取得指令按钮传出的数据
//判断是否可取得表单中指令按钮的传出值
if(Submit == null)
{
rs = stmt.executeQuery("SELECT * FROM Book"); //开启ResultSet变量
%>
<CENTER>
<TABLE bgcolor=DodgerBlue>
<TR bgcolor=SkyBlue>
<TD><B>书籍编号</B></TD><TD><B>书 名</B></TD>
<TD><B>书 名</B></TD></TR>
<%
//利用while循环配合next方法将数据表中的记录列出
while(rs.next())
{
%>
<TR>
<TD bgcolor = LightGoldenrodYellow><B>
<%= rs.getString("BookID") %></B></TD>
<TD bgcolor = LightGoldenrodYellow><B>
<%= rs.getString("Title") %></B></TD>
<TD bgcolor = LightGoldenrodYellow><B>
<%= rs.getInt("Price") %></B></TD>
</TR>
<%
}
%>
</TABLE>
</CENTER>
<BR>
<P><FONT SIZE = 4 COLOR = red>请输入欲修改售价的书号与新价格
</FONT></P>
<FORM action="UpdData.jsp" method=POST id=form2 name=form2>
书号:<INPUT type="text" name=tmpBookID><BR>
价格:<INPUT type="text" name=tmpNewPrice>
<INPUT type="submit" value="修改" name=submit1>
</FORM>
<%
}
else
{
String BID = request.getParameter("tmpBookID");
String Price = request.getParameter("tmpNewPrice");
//建立查询书籍数据的SQL字串
String strSQL = "SELECT * FROM Book WHERE " +
"BookID = '" + BID + "'";
rs = stmt.executeQuery(strSQL); //建立ResultSet对象
if(!rs.next())
{
%>
<CENTER>
<P>找不到书号为
<FONT SIZE = 4 COLOR = red>
<%= BID %>
</FONT>的书籍<P>
<%
}
else
{
String strUpd = "UPDATE Book SET PRICE = " +
Price + " WHERE BookID = '" +
BID + "'";
stmt.executeUpdate(strUpd); //执行数据更新语句
rs = stmt.executeQuery(strSQL); //执行SQL语句取得修改后的书籍数据
rs.next(); //移至第一笔记录
%>
<CENTER>
<H3><P><FONT SIZE = 5 COLOR = red>
<%= BID %>
</FONT>
修改后的详细数据如下:</P></H3>
<TABLE bgcolor=DodgerBlue>
<TR bgcolor=SkyBlue><TD><B>书籍编号</B></TD>
<TD bgcolor=LightGoldenrodYellow><B>
<%= rs.getString("BookID") %></B></TD></TR>
<TR bgcolor=SkyBlue><TD><B>书籍名称</B></TD>
<TD bgcolor=LightGoldenrodYellow><B>
<%= rs.getString("Title") %></B></TD></TR>
<TR bgcolor=SkyBlue><TD><B>出版日期</B></TD>
<TD bgcolor=LightGoldenrodYellow><B>
<%= rs.getString("PDate") %></B></TD></TR>
<TR bgcolor=SkyBlue><TD><B>作 者</B></TD>
<TD bgcolor=LightGoldenrodYellow><B>
<%= rs.getString("Author") %></B></TD></TR>
<TR bgcolor=SkyBlue><TD><B>价 格</B></TD>
<TD bgcolor = pink><B><FONT SIZE = 4 COLOR = red><B>
<%= rs.getInt("Price") %>
</B></FONT></TD></TR>
<TR bgcolor=SkyBlue><TD><B>总页数</B></TD>
<TD bgcolor=LightGoldenrodYellow><B>
<%= rs.getInt("Pages") %></B></TD></TR>
<TR bgcolor=SkyBlue><TD><B>备 注</B></TD>
<TD COLSPAN = 2 bgcolor=LightGoldenrodYellow><B>
<%= rs.getString("BookMemo")%></B>
</TD></TR></TABLE>
<%
}
%>
<P><A HREF = UpdData.jsp>还要进行修改</A></P></CENTER>
<%
}
%>
</BODY>
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