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Summary of Examples of Common Methods of jsp+mysql Database Operation

  • 2021-07-18 08:46:08
  • OfStack

This paper describes the common methods of jsp+mysql database operation with examples. Share it for your reference. The details are as follows:

1. View: 


<%@ page contentType="text/html;charset=GB2312" %> 
<%@ page import="java.sql.*" %> 
<HTML><style type="text/css">
<!--
body {
  background-color: #99CCFF;
}
-->
</style> 
<BODY>
<font color="#FFFFFF"> 
<center>
<% Connection con; 
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student","root","123456");
Statement sql; 
ResultSet rs; 
try
{ 
sql=con.createStatement(); 
rs=sql.executeQuery("SELECT * FROM student");
out.print("<Table Border style='font-size: 10pt'>"); 
out.print("<TR><td colspan=5 align=center> Candidate data </td></tr>"); 
out.print("<TR><td colspan=5 align=center><a href='add.jsp' target='_self'> Add candidate information </a></td></tr>"); 
out.print("<TR>"); 
out.print("<Td width=50 >"+" Name "); 
out.print("<Td width=100 >"+" Age "); 
out.print("<Td width=100>"+" Date of Birth "); 
out.print("<Td width=100 colspan=2>"+" Operation "); 
out.print("</TR>"); 
while(rs.next()) 
{ out.print("<TR>"); 
out.print("<TD >"+rs.getString(2)+"</TD>"); 
out.print("<TD >"+rs.getString(3)+"</TD>"); 
out.print("<TD >"+rs.getString(4)+"</TD>"); 
String idstr=rs.getString(1);
out.print("<TD><a href='delete.jsp?id="+idstr+"'> Delete </a></TD>"); 
out.print("<TD><a href='update.jsp?id="+idstr+"'> Modify </a></TD>"); 
out.print("</TR>") ; 
}
out.print("</Table>"); 
con.close(); 
} 
catch(SQLException e1) 
{ 
out.print("SQL Abnormal! ! ! ! "); 
} 
%> 
</center>
</BODY> 
</HTML>

2. add Add: 


<%@ page contentType="text/html;charset=gb2312" %>
<HTML><HEAD>
<style type="text/css">
<!--
body {
  background-image: url();
  background-color: #CCCCFF;
}
.STYLE5 {font-family: "Courier New", Courier, monospace; font-size: 14px; }
.STYLE6 {
  font-family: "Courier New", Courier, monospace;
  font-size: 24px;
}
-->
</style>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"></HEAD>
<BODY>
<Font size=2>
<p align="center" class="STYLE6"> Add candidate information </p>
<CENTER>
<FORM action="insert.jsp" name=form>
<table>
  <tr><td height="36"><span class="STYLE5"> Name :</span></td>
  <td><Input name="name" type=text size="15" ></td></tr>
  <tr>
   <td height="36"><span class="STYLE5"> Age :</span></td>
  <td><Input name="age" type=text size="15"></td></tr>
  <tr>
   <td height="36"><span class="STYLE5"> Date of birth :</span></td>
  <td><Input name="birth" type=text size="15"></td></tr>
 </table>
 <table width="165">
  <tr><td width="42" wnameth="42"><Input type=submit name="g" value=" Add "></td>
   <td width="28" wnameth="50">&nbsp;</td>
   <td width="42" wnameth="50"><Input type="reset" name="h" value=" Reset "></td>
   <td width="33" wnameth="42">&nbsp;</td>
  </tr>
</table>
</Form></CENTER>
</Body></HTML>

3. delete delete: 


<%@ page contentType="text/html;charset=gb2312" %> 
<%@ page import="java.sql.*" %> 
<html> 
<head> 
<title> Delete operation </title> 
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"><style type="text/css">
<!--
body {
  background-color: #FFCCFF;
}
-->
</style></head> 
<body> 
<center>
<% Connection con; 
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student","root","123456");
Statement stmt; 
Statement s; 
ResultSet rs; 
String id=request.getParameter("id");
try
{ 
stmt=con.createStatement();
String sql="delete from student where id="+id; 
stmt.executeUpdate(sql); 
s=con.createStatement(); 
rs=s.executeQuery("SELECT * FROM student"); 
out.print("<Table Border style='font-size: 10pt'>"); 
out.print("<TR><td colspan=5 align=center> Candidate data </td></tr>");
out.print("<TR><td colspan=5 align=center><a href='add.jsp' target='_self'> Add candidate information </a></td></tr>"); 
out.print("<TR>"); 
out.print("<Td width=50 >"+" Name "); 
out.print("<Td width=100 >"+" Age "); 
out.print("<Td width=100>"+" Date of Birth "); 
out.print("<Td width=100 colspan=2>"+" Operation "); 
out.print("</TR>"); 
while(rs.next()) 
{ out.print("<TR>"); 
out.print("<TD >"+rs.getString(2)+"</TD>"); 
out.print("<TD >"+rs.getString(3)+"</TD>"); 
out.print("<TD >"+rs.getString(4)+"</TD>"); 
String idstr=rs.getString(1);
out.print("<TD >"+idstr+"</TD>"); 
out.print("<TD><a href='delete.jsp?id="+idstr+"'> Delete </a></TD>"); 
out.print("<TD><a href='update.jsp?id="+idstr+"'> Modify </a></TD>"); 
out.print("</TR>") ; 
} 
out.print("</Table>"); 
con.close(); 
} 
catch(SQLException e1) 
{ 
out.print("SQL Abnormal! ! ! ! "); 
} 
%>
</center>
</body> 
</html>

4. update Example 1: 


<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title> Untitled document </title>
<style type="text/css">
<!--
body {
  background-color: #FFCCFF;
}
-->
</style></head>
<body>
<%String id=request.getParameter("id");
 Connection con; 
 String name=null;
 String age=null;
 String birth=null;
 String id1=null;
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student","root","123456");
Statement sql; 
ResultSet rs; 
try
{ 
sql=con.createStatement(); 
rs=sql.executeQuery("SELECT * FROM student");
while(rs.next()) 
{ 
 name=rs.getString(2);
 age=rs.getString(3);
 birth=rs.getString(4);
 id1=rs.getString(1);
}
con.close(); 
} 
catch(SQLException e1) 
{ 
out.print("SQL Abnormal! ! ! ! "); 
} 
%>
<center>
<form action="update2.jsp">
<center>
 <p>&nbsp; </p>
 <p> Name: 
  <input name="name" type="text" size="15" value="<%=name%>">
 </p>
 <p>
  Age: 
  <input name="age" type="text" size="15" value="<%=age%>">
 </p>
 <p> Date of Birth: 
  <input name="birth" type="text" size="15" value="<%=birth%>">
  <input name="id1" type="hidden" value="<%=id1%>" />
</p>
 <p><input name="g" type="submit" value=" Modify ">&nbsp; &nbsp; &nbsp;<input name="h" type="reset" value=" Reset "></p>
</form>
</center>
</body>
</html>

5. update Example 2: 


<%@ page contentType="text/html;charset=gb2312" %>
<%@ page import="java.sql.*" %> 
<%
String name=request.getParameter("name");
String age=request.getParameter("age");
String birth=request.getParameter("birth");
String id1=request.getParameter("id1");
System.out.println(id1);
Connection con=null;
try
{ 
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student","root","123456");
Statement sql; 
sql=con.createStatement(); 
String sql2="update student set name='"+name+"',age='"+age+"',birth='"+birth+"' where id="+id1;
System.out.print(sql2);
int s=sql.executeUpdate(sql2);
}
catch(Exception e){
System.out.println(e);
}
%>
 Congratulations, the revision is successful! <br />
<a href="chakan.jsp"> View </a>

6. insert insertion 


<%@ page contentType="text/html;charset=gb2312" %>
<%@ page import="java.sql.*" %> 
<%
String name=request.getParameter("name");
String age=request.getParameter("age");
String birth=request.getParameter("birth");
Connection con=null;
try
{ 
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/student","root","123456");
Statement sql; 
sql=con.createStatement(); 
String sql2="insert into student(name,age,birth) values('"+name+"','"+age+"','"+birth+"')";
System.out.print(sql2);
int s=sql.executeUpdate(sql2);
}
catch(Exception e){
System.out.println(e);
}
%>
 Congratulations, add success! <br />
<a href="chakan.jsp"> View </a>

7. Create a database 


/*
MySQL Data Transfer
Source Host: localhost
Source Database: student
Target Host: localhost
Target Database: student
Date: 2009-3-27 13:24:01
*/
SET FOREIGN_KEY_CHECKS=0;
create database student;
use student;
-- ----------------------------
-- Table structure for student
-- ----------------------------
CREATE TABLE `student` (
 `id` int(11) NOT NULL auto_increment,
 `name` varchar(255) default NULL,
 `age` varchar(255) default NULL,
 `birth` varchar(255) default NULL,
 PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=gbk;

I hope this article is helpful to everyone's JSP programming.

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