📄 example5_11.jsp

📁 可以让初学者有一个感性的认识

💻 JSP

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<HTML>
<%@page contentType="text/html;charset=GB2312"%>
<%@page import="java.sql.*" %>

<BODY bgcolor=cyan><Font size=3>

<%!	Connection con=null;
%>

<%		
	Statement sql=null;
	ResultSet rs=null;
	if(con==null)
	{
		try
		{
			Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
		}catch(ClassNotFoundException e){out.print(e);}
		try
		{
			con=DriverManager.getConnection("jdbc:odbc:sun","sa","");
			sql=con.createStatement();
			rs=sql.executeQuery("SELECT * FROM students");
			out.print("I am the first.");
		} catch(SQLException e1){ out.print(e1);}
	}
	else
	{
		synchronized(con)
		{
			try
			{
				sql=con.createStatement();
				rs=sql.executeQuery("SELECT * FROM students");
				out.print("I am not the first.");
			} catch(SQLException e1){ out.print(e1);}
		}
	}
	try
	{
		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>");
				out.print("<TD>"+rs.getString(1)+"</TD>");
				out.print("<TD>"+rs.getString(2)+"</TD>");
				out.print("<TD>"+rs.getInt("数学成绩")+"</TD>");
				out.print("<TD>"+rs.getInt("英语成绩")+"</TD>");
				out.print("<TD>"+rs.getInt("物理成绩")+"</TD>");
			out.print("</TR>");
		}
		out.print("</Table>");
	}catch(SQLException e1){}
%>

</FONT>
</BODY>
</HTML>

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