在代码中更新数据
<%@ page language="java" contentType="text/html; charset=UTF-8" import="java.sql.*"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>修改记录页面</title>
</head>
<body>
<% String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
//加载JDBC驱动
String dbURL = "jdbc:sqlserver://localhost:1433; DatabaseName=zero";
//连接服务器和数据库
String userName = "sa"; // 默认用户名
String userPwd = "123456"; // 密码
Connection dbConn = null;
try {
Class.forName(driverName);
dbConn = DriverManager.getConnection(dbURL, userName, userPwd);
} catch (Exception e) {
e.printStackTrace();
}
request.setCharacterEncoding("UTF-8");//设置字符编码，避免出现乱码
String sql="update stu_info set weight=? where name=?";//sql语句
PreparedStatement pstmt=dbConn.prepareStatement(sql);//创建接口对象
pstmt.setFloat(1, 60);
pstmt.setString(2, "嘻嘻");
int n=pstmt.executeUpdate();//这里面不需要参数
if(n==1){%> 数据修改成功！<br> <%}
else{%> 数据修改失败！<br> <%}
if(pstmt!=null) {pstmt.close();}
if(dbConn!=null) {dbConn.close();}
%>
</body>
</html>在网页中，根据自己提交的条件更新数据
提交代码
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>修改记录的条件提交页面</title>
</head>
<body>
请选择修改记录所满足的条件<hr width="100%" size="3"><!-- width设置线的长度 -->
<form action="update_stu_2_edit.jsp" method="post"><br><!-- 必需的 action 属性规定当提交表单时，向何处发送表单数据。 -->
姓名：<input type="text" name="name"><br><br>
性别：男<input type="radio" value="男" name="sex">
女<input type="radio" value="女" name="sex"><br><br>
<input type="submit" value="提交">
<input type="reset" value="取消">
</form>
</body>
</html>编辑代码
<%@ page language="java" contentType="text/html; charset=UTF-8" import="java.sql.*"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>修改编辑页面</title>
</head>
<body>
<% String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
//加载JDBC驱动
String dbURL = "jdbc:sqlserver://localhost:1433; DatabaseName=zero";
//连接服务器和数据库
String userName = "sa"; // 默认用户名
String userPwd = "123456"; // 密码
Connection dbConn = null;
try {
Class.forName(driverName);
dbConn = DriverManager.getConnection(dbURL, userName, userPwd);
} catch (Exception e) {
e.printStackTrace();
}
request.setCharacterEncoding("UTF-8");//设置字符编码，避免出现乱码
String sex=request.getParameter("sex");
String name=request.getParameter("name");
session.setAttribute("sex",sex);
session.setAttribute("name",name);
String sql="select * from stu_info where sex=? and name=?";//sql语句
PreparedStatement pstmt=dbConn.prepareStatement(sql);//创建接口对象
pstmt.setString(1,sex);
pstmt.setString(2,name);
ResultSet rs=pstmt.executeQuery();//这里面不需要参数
if(rs.next()){
int id=rs.getInt("id");
String name2=rs.getString("name");
String sex2=rs.getString("sex");
int age=rs.getInt("age");
float weight=rs.getFloat("weight");
float hight=rs.getFloat("hight");
if(rs!=null){rs.close();}
if(pstmt!=null) {pstmt.close();}
if(dbConn!=null) {dbConn.close();}
%>
<form action="update_stu_2.jsp" method="post">
<!-- method 属性规定如何发送表单数据（表单数据发送到 action 属性所规定的页面）。
表单数据可以作为 URL 变量（method="get"）或者 HTTP post （method="post"）的方式来发送。 -->
<table border="0" width="238" height="252">
<tr><td>学号</td><td><input name="id" value=<%=id%>></td></tr>
<tr><td>姓名</td><td><input name="name2" value=<%=name2%>></td></tr>
<tr><td>性别</td><td><input name="sex2" value=<%=sex2%>></td></tr>
<tr><td>年龄</td><td><input name="age" value=<%=age%>></td></tr>
<tr><td>体重</td><td><input name="weight" value=<%=weight%>></td></tr>
<tr><td>身高</td><td><input name="hight" value=<%=hight%>></td></tr>
<tr align="center">
<td colspan="2">
<input type="submit" value="提交">
<input type="reset" value="取消">
</td>
</tr>
</table>
</form>
<%}
else{%>
没有找到合适条件的记录！！<%
if(rs!=null){rs.close();}
if(pstmt!=null) {pstmt.close();}
if(dbConn!=null) {dbConn.close();}
}%>
</body>
接收代码
<%@ page language="java" contentType="text/html; charset=UTF-8" import="java.sql.*"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>修改后重写记录页面</title>
</head>
<body>
<% String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
//加载JDBC驱动
String dbURL = "jdbc:sqlserver://localhost:1433; DatabaseName=zero";
//连接服务器和数据库
String userName = "sa"; // 默认用户名
String userPwd = "123456"; // 密码
Connection dbConn = null;
try {
Class.forName(driverName);
dbConn = DriverManager.getConnection(dbURL, userName, userPwd);
} catch (Exception e) {
e.printStackTrace();
}
request.setCharacterEncoding("UTF-8");//设置字符编码，避免出现乱码
String sql="update stu_info set id=?,name=?,sex=?,age=?,weight=?,hight=? where name=? and sex=?";//sql语句
PreparedStatement pstmt=dbConn.prepareStatement(sql);//创建接口对象
int id=Integer.parseInt(request.getParameter("id"));
String name2=request.getParameter("name");
String sex2=request.getParameter("sex2");
int age=Integer.parseInt(request.getParameter("age"));
float weight=Float.parseFloat(request.getParameter("weight"));
float hight=Float.parseFloat(request.getParameter("hight"));
String name=(String)session.getAttribute("name");
String sex=(String)session.getAttribute("sex");
pstmt.setInt(1,id); //传递参数
pstmt.setString(2,name2);
pstmt.setString(3,sex2);
pstmt.setInt(4,age);
pstmt.setFloat(5,weight);
pstmt.setFloat(6,hight);
pstmt.setString(7,name);
pstmt.setString(8,sex);
int n=pstmt.executeUpdate();//这里面不需要参数
if(n>=1){%> 重写数据成功！<br> <%}
else{%> 重写数据失败！<%=n %><br> <%}
if(pstmt!=null) {pstmt.close();}
if(dbConn!=null) {dbConn.close();}
%>
</body>
</html>