oracle过程中如何让调用动态带参过程

[saxsss]

SQL> var c varchar2(2000);
SQL> exec testdemo('{"aab078":"330301","aac001":"","aac002":"1","aac003":"q","aac004":"1","aac005":"01","aac006":"2017-07-18","aga001":"0002","bdc002":"","bsc412":"2"}',:c);

PL/SQL procedure successfully completed
c
---------
{
"aab078" : "330301"
,
"aac001" : ""
,
"aac002" : "1"
,
"aac003" : "q"
,
"aac004" : "1"
,
"aac005" : "01"
,
"aac006" : "2017-07-18"
,
"aga001" : "0002"
,
"bdc002" : ""
,
"bsc412" : "2"
,
"pro_code" : "0"
,
"pro_success" : false,
"pro_msg" : "msg:\u4E0D\u80FD\u91CD\u590D\u4FDD\u5B58\u540C\u4E00\u4EBA\uFF01"

}，我在命令行中可以执行，有返回结果C，放在过程里怎么写，应该怎么执行，testdemo中1个传入string ，一个传出string，一共2个参数，求大婶解答下，蟹蟹！

[sxq129601]

exec testdemo 你这个就是过程里执行了啊。等价于 declare c varchar2(2000):='dsdsad'; begin testdemo(c); end;