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📄 第5章（1）.txt

📁 《JSP 实用教程》源代码,内含各章实例代码
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123 
       sql.executeUpdate(condition1);
       sql.executeUpdate(condition2);
       sql.executeUpdate(condition3);
       //显示更新后的表中的记录：
     %>
     <P>更新后的表的记录：
     <%
       rs=sql.executeQuery("SELECT * FROM students");
       out.print("<Table Border>");
            out.print("<TR>");
            out.print("<TH width=100>"+"学号");
            out.print("<TH width=100>"+"姓名");
            out.print("<TH width=50>"+"数学成绩");
            out.print("<TH width=50>"+"英语成绩");
            out.print("<TH width=50>"+"物理成绩");
            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("数学成绩"); 
                 out.print("<TD >"+math+"</TD>"); 
                 english=rs.getInt("英语成绩"); 
                 out.print("<TD >"+english+"</TD>");
                 physics=rs.getInt("物理成绩"); 
                 out.print("<TD >"+physics+"</TD>"); 
            out.print("</TR>") ;  
          }
       out.print("</Table>");
      con.close();
     }
    catch(SQLException e)
     { }
 %>
</FONT>
</BODY>
</HTML>

例子9（效果如图5.24、5.25所示）
Example5_9.jsp:
<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import="java.sql.*" %>
<HTML>
<BODY bgcolor=pink >
<Font size=1>
<P>添加新的记录到数据库：
<FORM action="newDatabase.jsp" method=post>
同学学号：
<Input type="text" name="number">
<BR>同学姓名：
<Input type="text" name="name">
<BR>数学成绩：
<Input type="text" name="math">
<BR>英语成绩：
<Input type="text" name="english">
<BR>物理成绩：
<Input type="text" name="physics">
<BR><Input type="submit" name="b" value="提交添加">
<P>数据库添加记录前的数据记录是：
 <% 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:moon","sa","");
         sql=con.createStatement();
         rs=sql.executeQuery("SELECT * FROM students");
         out.print("<Table Border>");
         out.print("<TR>");
            out.print("<TH width=100>"+"学号");
            out.print("<TH width=100>"+"姓名");
            out.print("<TH width=50>"+"数学成绩");
            out.print("<TH width=50>"+"英语成绩");
            out.print("<TH width=50>"+"物理成绩");
         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("数学成绩"); 
             out.print("<TD >"+math+"</TD>"); 
             english=rs.getInt("英语成绩"); 
             out.print("<TD >"+english+"</TD>");
             physics=rs.getInt("物理成绩"); 
             out.print("<TD >"+physics+"</TD>");   
        out.print("</TR>") ; 
        }
        out.print("</Table>");
        con.close();
     }
   catch(SQLException e1) {}
 %>
</Font>
</BODY>
</HTML>

newDatabase.jsp：
<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import="java.sql.*" %>
<HTML>
<BODY bgcolor=pink ><Font size=1>
  <% //获取提交的学号：
    String number=request.getParameter("number");
          if(number==null)
            {number="";
            }
     byte b[]=number.getBytes("ISO-8859-1");
     number=new String(b);
    //获取提交的姓名：
    String name=request.getParameter("name");
          if(name==null)
            {name="";
            }
     byte c[]=name.getBytes("ISO-8859-1");
     name=new String(c);
     //获取提交的新的数学成绩：
    String m=request.getParameter("math");
          if(m==null)
            {m="-100"; }
    //获取提交的新的英语成绩：
    String e=request.getParameter("english");
          if(e==null)
            {e="-100"; }
     //获取提交的新的物理成绩：
     String p=request.getParameter("physics");
          if(p==null)
            {p="-100"; } 
    Connection con=null;
    Statement sql=null;
    ResultSet rs=null;
       try{Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); }
       catch(ClassNotFoundException event){}
   try {con=DriverManager.getConnection("jdbc:odbc:moon","sa","");
       sql=con.createStatement();
       String condition=
       "INSERT INTO students VALUES"+"("+"'"+number+"','"+name+"',"+m+","+e+","+p+")";
       sql.executeUpdate(condition); //执行添加操作：
       //显示添加新记录后表中的记录：
     %>
     <P>添加新记录后的表：
     <%
       rs=sql.executeQuery("SELECT * FROM students ORDER BY 学号 ");
       out.print("<Table Border>");
            out.print("<TR>");
            out.print("<TH width=100>"+"学号");
            out.print("<TH width=100>"+"姓名");
            out.print("<TH width=50>"+"数学成绩");
            out.print("<TH width=50>"+"英语成绩");
            out.print("<TH width=50>"+"物理成绩");
            out.print("</TR>");
       while(rs.next())
           {    out.print("<TR>");
                String n=rs.getString(1);
                 out.print("<TD >"+n+"</TD>"); 
                String xingming=rs.getString(2);
                 out.print("<TD >"+xingming+"</TD>");
                int  math=rs.getInt("数学成绩"); 
                 out.print("<TD >"+math+"</TD>"); 
                int english=rs.getInt("英语成绩"); 
                 out.print("<TD >"+english+"</TD>");
                int physics=rs.getInt("物理成绩"); 
                 out.print("<TD >"+physics+"</TD>"); 
            out.print("</TR>") ;  
         }
       out.print("</Table>");
      con.close();
     }
    catch(SQLException event)
     { }
 %>
</FONT>
</BODY>
</HTML>

例子10（效果如图5.26、5.27所示）
Example5_10.jsp：
<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import="java.sql.*" %>
<HTML>
<BODY bgcolor=pink >
<Font size=1>
<P>删除记录：
<FORM action="delete.jsp" method=post>
输入被删除记录的学号：
<Input type="text" name="number">
<BR>
<BR><Input type="submit" name="b" value="提交删除">
</FORM>
<P>数据库删除前的数据记录是：
 <% 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>"+"学号");
            out.print("<TH width=100>"+"姓名");
            out.print("<TH width=50>"+"数学成绩");
            out.print("<TH width=50>"+"英语成绩");
            out.print("<TH width=50>"+"物理成绩");
         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("数学成绩"); 
             out.print("<TD >"+math+"</TD>"); 
             english=rs.getInt("英语成绩"); 
             out.print("<TD >"+english+"</TD>");
             physics=rs.getInt("物理成绩"); 
             out.print("<TD >"+physics+"</TD>");   
        out.print("</TR>") ; 
        }
        out.print("</Table>");
        con.close();
     }
   catch(SQLException e1) {}
 %>
</Font>
</BODY>
</HTML>

delete.jsp：
<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import="java.sql.*" %>
<HTML>
<BODY bgcolor=pink ><Font size=1>
  <% //获取提交的学号：
    String number=request.getParameter("number");
          if(number==null)
            {number="";
            }
     byte b[]=number.getBytes("ISO-8859-1");
     number=new String(b);
    Connection con=null;
    Statement sql=null;
    ResultSet rs=null;
       try{Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
          }
       catch(ClassNotFoundException event){}
       try {con=DriverManager.getConnection("jdbc:odbc:sun","sa","");
       sql=con.createStatement();
       //删除操作：
       String deleteAll="DELETE  FROM students WHERE 学号"+" = "+"'"+number+"'";
       sql.executeUpdate(deleteAll);
      %>
     <P>删除记录后的表：
     <%
       rs=sql.executeQuery("SELECT * FROM students ORDER BY 学号 ");
       out.print("<Table Border>");
            out.print("<TR>");
            out.print("<TH width=100>"+"学号");
            out.print("<TH width=100>"+"姓名");
            out.print("<TH width=50>"+"数学成绩");
            out.print("<TH width=50>"+"英语成绩");
            out.print("<TH width=50>"+"物理成绩");
            out.print("</TR>");
       while(rs.next())
           {    out.print("<TR>");
                String n=rs.getString(1);
                 out.print("<TD >"+n+"</TD>"); 
                String xingming=rs.getString(2);
                 out.print("<TD >"+xingming+"</TD>");
                int  math=rs.getInt("数学成绩"); 
                 out.print("<TD >"+math+"</TD>"); 
                int english=rs.getInt("英语成绩"); 
                 out.print("<TD >"+english+"</TD>");
                int physics=rs.getInt("物理成绩"); 
                 out.print("<TD >"+physics+"</TD>"); 
            out.print("</TR>") ;  
         }
       out.print("</Table>");
      con.close();
     }
    catch(SQLException event)
          {out.print(""+event);
          }
 %>
</FONT>
</BODY>
</HTML>
123

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