📄 delete.jsp
字号:
<%@ page contentType="text/html; charset=GB2312" %>
<%@ page import="java.sql.*" %>
<%@ page language="java" %>
<%@ include file="Conn.jsp" %>
<HTML>
<HEAD>
<TITLE>删除数据</TITLE>
</HEAD>
<BODY>
<CENTER>
<FONT SIZE = 5 COLOR = blue>删除数据</FONT>
</CENTER>
<BR>
<HR>
<BR>
<%
String BID = request.getParameter("tmpBookID"); //取得tmpBookID栏位传出的数据
if(BID == null) //判断是否可取得表单中指令按钮的传出值
{
rs = stmt.executeQuery("SELECT * FROM Book"); //开启ResultSet变量
%>
<CENTER>
<TABLE bgcolor=DodgerBlue>
<TR bgcolor=DeepSkyBlue>
<TD><B>书籍编号</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>
</TR>
<%
}
%>
</TABLE>
</CENTER>
<BR>
<CENTER>
<P><FONT SIZE = 4 COLOR = red>请输入欲进行数据删除的书号
</FONT></P>
<FORM action="Delete.jsp" method=POST name=form2>
<INPUT type="text" name=tmpBookID>
<INPUT type="submit" value="删除" name=submit1>
</FORM>
</CENTER>
<%
}
else
{
//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变量
if(!rs.next())
{
%>
<CENTER>
<P>找不到书号为
<FONT SIZE = 4 COLOR = red>
<%= BID %>
</FONT>的书籍, 无法进行数据的删除<P>
<%
}
else
{
//删除数据的SQL语句
String strDel = "DELETE * FROM Book WHERE " +
"BookID = '" + BID + "'";
stmt.executeUpdate(strDel); //执行删除动作
rs = stmt.executeQuery("SELECT * FROM Book"); //重新开启记录集变量取得Book数据表中的数据
%>
<CENTER>
<TABLE bgcolor=DodgerBlue>
<TR bgcolor=SkyBlue>
<TD><B>书籍编号</B></TD><TD><B>书 名</B></TD>
<TD><B>作 者</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.getString("Author") %></B></TD>
</TR>
<%
}
%>
</TABLE>
</CENTER>
<%
}
%>
<P><A HREF = Delete.jsp>还要删除</A></P></CENTER>
<%
}
%>
</BODY>
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