?? 第5章（1）.txt
字號:
if(englishmin==null)
{englishmin="0";
}
String mathmax=request.getParameter("mathmax");
if(mathmax==null)
{mathmax="100";
}
String mathmin=request.getParameter("mathmin");
if(mathmin==null)
{mathmin="0";
}
Connection con=null;
Statement sql=null;
ResultSet rs=null;
try{Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}
catch(ClassNotFoundException e){}
try
{ con=DriverManager.getConnection("jdbc:odbc:sun","sa","");
sql=con.createStatement();
String eCondition="英語成績 <= "+englishmax+" AND "+"英語成績 >= "+englishmin;
String mCondition="數學成績 <= "+mathmax+" AND "+"數學成績 >= "+mathmin;
String condition="SELECT * FROM students WHERE "+mCondition+" and "+eCondition;
rs=sql.executeQuery(condition);
out.print("<Table Border>");
out.print("<TR>");
out.print("<TH width=100>"+"學號");
out.print("<TH width=100>"+"姓名");
out.print("<TH width=50>"+"數學成績");
out.print("<TH width=50>"+"英語成績");
out.print("<TH width=50>"+"物理成績");
out.print("</TR>");
while(rs.next())
{ out.print("<TR>");
out.print("<TD >"+rs.getString(1)+"</TD>");
out.print("<TD >"+rs.getString(2)+"</TD>");
out.print("<TD >"+rs.getInt("數學成績")+"</TD>");
out.print("<TD >"+rs.getInt("英語成績")+"</TD>");
out.print("<TD >"+rs.getInt("物理成績")+"</TD>");
out.print("</TR>") ;
}
out.print("</Table>");
con.close();
}
catch(SQLException e)
{}
%>
</BODY>
</HTML>
例子6（效果如圖5.19、5.20所示）
Example5_6:
<%@ page contentType="text/html;charset=GB2312" %>
<HTML>
<BODY>
<P>查詢成績：
<Font size=1>
<FORM action="byname1.jsp" method=post name=form>
<INPUT type="radio" name="R" value="姓名">按姓氏排序
<INPUT type="radio" name="R" value="數學成績+英語成績+物理成績">按總分排序
<INPUT type="radio" name="R" value="英語成績">按英語排序
<BR> <Input type=submit name="g" value="提交">
</Form>
</BODY>
</HTML>
byname1.jsp：
<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import="java.sql.*" %>
<HTML>
<BODY>
<% //獲取提交的排序方式：
String name=request.getParameter("R");
if(name==null)
{name="";}
byte b[]=name.getBytes("ISO-8859-1");
name=new String(b);
String number,xingming;
Connection con=null;
Statement sql=null;
ResultSet rs=null;
int math,english,physics;
try{Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}
catch(ClassNotFoundException e){}
try { con=DriverManager.getConnection("jdbc:odbc:sun","sa","");
sql=con.createStatement();
String condition="SELECT * FROM students ORDER BY "+name;
rs=sql.executeQuery(condition);
out.print("<Table Border>");
out.print("<TR>");
out.print("<TH width=100>"+"學號");
out.print("<TH width=100>"+"姓名");
out.print("<TH width=50>"+"數學成績");
out.print("<TH width=50>"+"英語成績");
out.print("<TH width=50>"+"物理成績");
out.print("<TH width=50>"+"總成績");
out.print("</TR>");
while(rs.next())
{ out.print("<TR>");
number=rs.getString(1);
out.print("<TD >"+number+"</TD>");
xingming=rs.getString(2);
out.print("<TD >"+xingming+"</TD>");
math=rs.getInt("數學成績");
out.print("<TD >"+math+"</TD>");
english=rs.getInt("英語成績");
out.print("<TD >"+english+"</TD>");
physics=rs.getInt("物理成績");
out.print("<TD >"+physics+"</TD>");
int total=math+english+physics;
out.print("<TH >"+total+"</TH>");
out.print("</TR>") ;
}
out.print("</Table>");
con.close();
}
catch(SQLException e)
{ }
%>
</BODY>
</HTML>
例子7（效果如圖5.21所示）
Example5_7.jsp：
<%@ page contentType="text/html;charset=GB2312" %>
<HTML>
<BODY>
<P>查詢成績：
<Font size=1>
<P>輸入學生的姓氏:
<BR> <FORM action="byname2.jsp" method=post name=form>
<INPUT type="text" name="name" value="王">
<BR> <Input type=submit name="g" value="提交">
</Form>
</BODY>
</HTML>
byname2.jsp：
<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import="java.sql.*" %>
<HTML>
<BODY>
<% //獲取提交的姓氏：
String name=request.getParameter("name");
if(name==null)
{name="";
}
byte b[]=name.getBytes("ISO-8859-1");
name=new String(b);
String number,xingming;
Connection con=null;
Statement sql=null;
ResultSet rs=null;
int math,english,physics;
try{Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}
catch(ClassNotFoundException e){}
try{ con=DriverManager.getConnection("jdbc:odbc:sun","sa","");
sql=con.createStatement();
String condition="SELECT * FROM students" ;
rs=sql.executeQuery(condition);
out.print("<Table Border>");
out.print("<TR>");
out.print("<TH width=100>"+"學號");
out.print("<TH width=100>"+"姓名");
out.print("<TH width=50>"+"數學成績");
out.print("<TH width=50>"+"英語成績");
out.print("<TH width=50>"+"物理成績");
out.print("</TR>");
while(rs.next())
{ number=rs.getString(1);
xingming=rs.getString(2);
if(xingming.startsWith("王"))
{ out.print("<TR>");
out.print("<TD >"+number+"</TD>");
out.print("<TD >"+xingming+"</TD>");
math=rs.getInt("數學成績");
out.print("<TD >"+math+"</TD>");
english=rs.getInt("英語成績");
out.print("<TD >"+english+"</TD>");
physics=rs.getInt("物理成績");
out.print("<TD >"+physics+"</TD>");
out.print("</TR>") ;
}
}
out.print("</Table>");
con.close();
}
catch(SQLException e)
{ }
%>
</BODY>
</HTML>
例子8（效果如圖5.22、5.23所示）
Example5_8.jsp：
<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import="java.sql.*" %>
<HTML>
<BODY bgcolor=pink >
<Font size=1>
<FORM action="newResult.jsp" method=post>
輸入要修改成績的同學的姓名：<BR>
<Input type="text" name="name">
<BR>輸入新的數學成績：
<Input type="text" name="math">
<BR>輸入新的英語成績：
<Input type="text" name="english">
<BR>輸入新的物理成績：
<Input type="text" name="physics">
<BR><Input type="submit" name="b" value="提交更新">
<P>數據庫更新前的數據記錄是：
<% String name,number;
int math,physics,english;
Connection con;
Statement sql;
ResultSet rs;
try{Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}
catch(ClassNotFoundException e){}
try{ con=DriverManager.getConnection("jdbc:odbc:sun","sa","");
sql=con.createStatement();
rs=sql.executeQuery("SELECT * FROM students");
out.print("<Table Border>");
out.print("<TR>");
out.print("<TH width=100>"+"學號");
out.print("<TH width=100>"+"姓名");
out.print("<TH width=50>"+"數學成績");
out.print("<TH width=50>"+"英語成績");
out.print("<TH width=50>"+"物理成績");
out.print("</TR>");
while(rs.next())
{ out.print("<TR>");
number=rs.getString(1);
out.print("<TD >"+number+"</TD>");
name=rs.getString(2);
out.print("<TD >"+name+"</TD>");
math=rs.getInt("數學成績");
out.print("<TD >"+math+"</TD>");
english=rs.getInt("英語成績");
out.print("<TD >"+english+"</TD>");
physics=rs.getInt("物理成績");
out.print("<TD >"+physics+"</TD>");
out.print("</TR>") ;
}
out.print("</Table>");
con.close();
}
catch(SQLException e1) {}
%>
</Font>
</BODY>
</HTML>
newResult.jsp：
<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import="java.sql.*" %>
<HTML>
<BODY bgcolor=pink ><Font size=1>
<% //獲取提交的姓名：
String name=request.getParameter("name");
if(name==null)
{name="";
}
byte b[]=name.getBytes("ISO-8859-1");
name=new String(b);
//獲取提交的新的數學成績：
String newMath=request.getParameter("math");
if(newMath==null)
{newMath="-100";
}
//獲取提交的新的英語成績：
String newEnglish=request.getParameter("english");
if(newEnglish==null)
{newEnglish="-100";
}
//獲取提交的新的物理成績：
String newPhysics=request.getParameter("physics");
if(newPhysics==null)
{newPhysics="-100";
}
Connection con=null;
Statement sql=null;
ResultSet rs=null;
String number,xingming;
int math,english,physics;
try{Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
}
catch(ClassNotFoundException e){}
try {con=DriverManager.getConnection("jdbc:odbc:sun","sa","");
sql=con.createStatement();
String condition1=
"UPDATE students SET 數學成績 = "+newMath+" WHERE 姓名="+"'"+name+"'" ,
condition2=
"UPDATE students SET 英語成績 = "+newEnglish+" WHERE 姓名="+"'"+name+"'" ,
condition3=
"UPDATE students SET 物理成績 = "+newPhysics+" WHERE 姓名="+"'"+name+"'" ;
//執行更新操作：
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