错误Unknown column 'root' in 'where clause'

try{

   InitialContext ctx=new InitialContext();

   ds=(DataSource)ctx.lookup("java:comp/env/jdbc/xyrcw");

   Connection conn = ds.getConnection();

   Statement stmt = conn.createStatement();

   
   
    String query = "select * from administrator where admin_name="+name;
    ResultSet rs = stmt.executeQuery(query);
    if(rs ==null)
    {
        out.print("<script>msg2();</script>");
    }
   
     while(rs.next()){
     String str=rs.getString("admin_password");
     if (!pwd.equals(str))
    {
        out.print("<script>msg2();</script>");
    }
    }
   
    int id=rs.getInt("admin_id");   
    session.setAttribute("adminId",id);
    session.setAttribute("adminName",name);
    session.setAttribute("adminPwd",pwd);
   
    query = "select * from admin_login_statistics order by admin_login_statistics_id desc;";
     rs = stmt.executeQuery(query);
    int num_results = rs.getRow();
    for ( int i=0 ; i<num_results;i++)
    {
        while(rs.next()){
        if(i>100)
        {
         query = "delete from admin_login_statistics where admin_login_statistics_id="+rs.getInt("admin_login_statistics_id");
         stmt.executeUpdate(query);
        }
        }
    }
   
   
    HttpServletRequest req=null;
    String ip=req.getRemoteAddr();
    String date=new java.sql.Date(new java.util.Date().getTime()).toString();
    query = "insert into admin_login_statistics (admin_name,admin_login_date,admin_login_ip,admin_logout_date)values('"+name+"','"+date+"','"+ip+"','"+date+"')";
   
     stmt.executeUpdate(query);

   
    response.sendRedirect("index.jsp");
}

   catch(Exception ex){

       out.print("<script>msg1();</script>");

    ex.printStackTrace();

   }
输入账号root和密码时出现错误Unknown column 'root' in 'where clause'，请问怎么回事？
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