如何在jsp中使用javascript在警报消息中显示SQL的结果？

Question

下面是jsp中的COUNT个SQL语句。正如您所看到的，我的学生级别下拉列表将显示每个级别的计数。如果用户点击其中一个下拉列表，那么如果学生级别达到最多5个人，系统将生成警报消息，但我没有这样做。我认为我的方法是错误的。请帮助我实现它。

  <%

try{

        Connection conn = connectionManager.getConnection();

        String searchQuery = "Select count(studentlevel) AS COUNTER1 FROM student WHERE studentlevel = '1'";
        OraclePreparedStatement pst = (OraclePreparedStatement) conn.prepareStatement(searchQuery);
        OracleResultSet rs = (OracleResultSet) pst.executeQuery();

        String searchQuery2 = "Select count(studentlevel) AS COUNTER2 FROM student WHERE studentlevel = '2'";
        OraclePreparedStatement pst2 = (OraclePreparedStatement) conn.prepareStatement(searchQuery2);
        OracleResultSet rs2 = (OracleResultSet) pst2.executeQuery();

        String searchQuery3 = "Select count(studentlevel) AS COUNTER3 FROM student WHERE studentlevel = '3'";
        OraclePreparedStatement pst3 = (OraclePreparedStatement) conn.prepareStatement(searchQuery3);
        OracleResultSet rs3 = (OracleResultSet) pst3.executeQuery();
%>

<div class="select-wrapper">Student Level:
                                    <select name="studentlevel" id="studentlevel" required>
                                            <option value="">- Student Level -</option>
<%  

                                                while(rs3.next()){

                                                    System.out.println("The sql : "+searchQuery3);                      
                                                    count3 = rs3.getString(1);

                                            %>
                                            <option value="3">3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[<%= count3 %>/5]</option>
                                            <p id="message5"></p>
                                            <%} %>
                                            <%  

                                                while(rs2.next()){

                                                    System.out.println("The sql : "+searchQuery2);                      
                                                    count2 = rs2.getString(1);

                                            %>
                                            <option value="2">2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[<%= count2 %>/5]</option>
<p id="message6"></p>                                               
<%} %>
                                            <%  

                                                while(rs.next()){

                                                    System.out.println("The sql : "+searchQuery);                       
                                                    count1 = rs.getString(1);

                                            %>
                                            <option value="1">1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[<%= count1 %>/5]</option>
<p id="message7"></p>                                               
<%} %>
                                        </select>
                                    </div>

JAVASCRIPT

<script>
var c, d, e, text5, text 6, text7;
c = document.getElementById("count3").value;
d = document.getElementById("count2").value;
e = document.getElementById("count1").value;
if(c>0 || c<=5)
{
text5 = "The Class is Already Full, Please Contact the Clerk for Futher Information.";
}
else
    {text5= "";
    }

if(d>0 || d<=5)
{
text6 = "The Class is Already Full, Please Contact the Clerk for Futher Information.";
}
else
    {text6= "";
    }

if(e>0 || e<=5)
{
text7 = "The Class is Already Full, Please Contact the Clerk for Futher Information.";
}
else
    {text7= "";
    }
document.getElementById("message5").innerHTML = text5;
document.getElementById("message6").innerHTML = text6;
document.getElementById("message7").innerHTML = text7;
</script>