哥哥教教我
import java.io.*;
import java.net.*;
import shuj.*;
import java.sql.*;
import javax.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class passwd_xg extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType( "text/html;charset=UTF-8 ");
PrintWriter out = response.getWriter();
try{
String password = request.getParameter( "textfield ");
String username = request.getParameter( "textfield2 ");
String name = request.getParameter( "name8 ");
DBConnection dbc = new DBConnection();
String sqlpw = "update adminzw set 密码= ' "+username+ " ' where 密码 = ' "+password + " ' ";
dbc.executeQuery(sqlpw);
String sql = "selest * from adminzw 账号= ' "+name+ " ' ";
out.println( " <h2> 恭喜你资料修改成功!! </h2> <br> ");
/* ResultSet rs = dbc.executeQuery(sql);
if(rs.next()){
response.sendRedirect( "admin_index.jsp ");
}*/
}
catch(Exception e)
{
out.println( " <h2> 捕获到异常!! </h2> <br> ");
out.print( " <html> ") ;
out.println( " <body bgcolor= #CC66FF> ");
out.println( " </body> ");
out.print( " </html> ") ;
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
}
这段代码出什么问题了呢？
用户的密码修改不了
[解决办法]
dbc.executeQuery(sqlpw);应该是dbc.executeUpdate(sqlpw);
[解决办法]
抛出异常错错!
[解决办法]
dbc.executeUpdate(sqlpw)
[解决办法]
楼上的对,你修改的UPDATE错误了
[解决办法]
String sqlpw = "update adminzw set 密码= ' "+username+ " ' where 密码 = ' "+password + " ' ";
这里的错误吧
[解决办法]
update adminzw set 密码= ' " + newpassword + " ' where 帐号= ' " + username + " ' and 密码= ' " + password + " '
[解决办法]
String sqlpw = "update adminzw set 密码= ' "+username+ " ' where 密码 = ' "+password + " ' ";
dbc.executeQuery(sqlpw);
1) 改密码要有2个条件 不能是把所有密码为8888的都改了 需要看帐号
2）执行update语句用 executeUpdate
[解决办法]
首先你写的sql语句就有逻辑上的错误,改成
update adminzw set 密码= ' " + newpassword + " ' where 帐号= ' " + username + " ' "
其次用
dbc.executeUpdate来执行sql语句，你用的是查询功能，是要返回记录集的。
[解决办法]
String sqlpw = "update adminzw set 密码= ' "+username+ " ' where 密码 = ' "+password + " ' "; 更新的where条件不能和set中的字段相同，这个是数据库更新原理。
dbc.executeQuery(sqlpw); 这里不能使用executeQuery,这个是做检索时用的返回的是result，应该使用execteupdate，他返回的是一个整形数，根据这个数可以判断是否操作成功
[解决办法]
String sqlpw = "update adminzw set 密码= ' "+username+ " ' where 密码 = ' "+password + " ' ";
dbc.executeQuery(sqlpw);
1) 改密码要有2个条件 不能是把所有密码为8888的都改了 需要看帐号
2）执行update语句用 executeUpdate
