usernamedao.java

网上购物源代码

/**
 * 
 */
package com.chinaaccpDao;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;

/**
 * @author Administrator
 *
 */
public class UserNameDao {

	public String GetCheckInfo(String username)
	{
		Connection con =null;
		String info = null;
		try {
			con = ConnectionLee.GetCon();
			Statement st = con.createStatement();
			String sql = "select logname from userinfo where logname='"+username+"'";
			ResultSet rs = st.executeQuery(sql);
			
			if(rs.next())
			{
				info = "已存在此用户";
				
				return info;
			}
			else
			{
				info = "此用户名可用";
				return info;
			}
		} catch (Exception e) {
			info = e.getMessage();
		}
		return info;
		
	}
}