MySQL查询问题与Flex, php

我试图通过MySQL查询变量从flex到MySQL使用php。

这是Flex中的查询。

mysqlQuery("INSERT INTO poc_note_test (first_name,last_name) VALUES ("+firstName+"," +lastName+")");

当查询通过http传递给我的服务器由PHP处理时，它返回以下错误

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'Test_Value )' at line 1

从我可以看到，它试图包括最后的")"作为值的一部分。我无论如何也不知道怎样才能阻止这件事的发生。

这里是用来处理错误的查询的php。

$sql = $_REQUEST['sql'];
$result = mysql_query($sql);
$err = mysql_error();
$cols_count = mysql_num_fields($result) or error_log('Invalid query: ' .mysql_error());

任何帮助都将不胜感激

传递查询的函数。也许问题就在这里?

public function mysqlQuery(sql:String,fid:String):void {
var http:HTTPService = new HTTPService;
var parm:Object = new Object;
parm.sql = sql;
parm.private_key = private_key;
parm.fas_db = mysql_db; 
http.url = mysql_url+"?irand="+Math.random();
http.showBusyCursor = true;
http.request = sql;
http.addEventListener(ResultEvent.RESULT, mysqlResult);
http.addEventListener(FaultEvent.FAULT, mysqlFault);
http.method = "POST";
sqlToken = http.send(parm);
sqlToken.param = fid;

}