<%@page import="com.sun.corba.se.spi.orbutil.fsm.Guard.Result"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" %>
<%@ page import= "edu.jmi.db.*" %>
<%@ page import= "edu.jmi.dao.*" %>
<%@ page import= "edu.jmi.model.*" %>
<%@ page import= "java.sql.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
Insert title here
<%
String str =null;
//1设置解码
request.setCharacterEncoding("utf-8");
//2获取参数
str=request.getParameter("name");
String str1=request.getParameter("password");
String str2=request.getParameter("password2");
String str3=request.getParameter("mail");
System.out.println(str+str1+str2+str3);
if(str==null){//如果初次加载页面,直接返回,不会执行下面存取数据库的代码
//return;
}else{
//3存取数据库
//3.1获取数据库链接
Connection conn=DB.getConnection();
//3.2准备插入sql语句
String sql2="select count(*) from table where column='name'";
PreparedStatement pst2=conn.prepareStatement(sql2);
if(count!=0){
session.setAttribute("errmsg2", "用户名已存在,请重新输入");
}else{
String sql="insert into user(name,password,email) values(?,?,?)";
PreparedStatement pst=conn.prepareStatement(sql);//执行sql语句
// pst.setInt(1,1); //id
pst.setString(1,str);//name
pst.setString(2,str1);//pass
pst.setString(3,str3);//email
if(str1.equals(str2)){
//3.3执行插入
int res=pst.executeUpdate();
System.out.println("插入结果是:"+res);
pst.close();
conn.close();
session.setAttribute("usr", str);
response.sendRedirect("regok.jsp");
}else{
session.setAttribute("errmsg", "密码和确认密码不一致");
}
String err = (String)session.getAttribute("errmsg");
if(err==null){
err="";
}
String err2 = (String)session.getAttribute("errmsg2");
if(err2==null){
err2="";
}
}
}
%>
<%=session.getAttribute("errmsg") %>
<%=session.getAttribute("errmsg2") %>
用户名:
密码:
确认密码:
邮箱:
我想在执行注册前先查询数据表里用户名出现的次数,如果次数不为0则给提示,不执行之后的操作,但是查询次数的语句好像出错了,求大神
String sql2="select count(*) from table where column='name'";
PreparedStatement pst2=conn.prepareStatement(sql2);
if(count!=0){
session.setAttribute("errmsg2", "用户名已存在,请重新输入");
}else{
}