cfargument is not passing in cfoutput with cfquery - coldfusion

Question

I could not use student_id in cfoutput with query. My argument didn't pass in getStudentAnswers function. How can I do this?
I want to create JSON and need to add question and questions' answers near exam like this:
[
{
"id": "7",
"type": "2",
"question_id": "20",
"question": "Write a summary by answering the questions below: * What is convergence? * What will be the implications of convergence on classical media? on users? * Which devices/media forms do you think will converge nowadays/in the future? * What will be the opportunities and threats emerged by the convergence?",
"question_type": "0",
"answer": "",
"name": "Assignment3ver2",
"deadline_date": "2014-11-22 00:00:00.0"
}
Functions:
<cffunction name="getQuestion" >
<cfargument name="exam_id" type="string" required="true" >
<cfargument name="student_id" type="string" required="true" >
<cfset mert="#student_id#" >
<cfquery dataSource="mobileCourse" name="questselect">
SELECT id,question,question_type FROM dbo.Questions WHERE exam_id=#exam_id#
</cfquery>
<cfoutput query="questselect">
"question_id": "#id#",
"question": "#question#",
"question_type": "#question_type#",
#getStudentAnswers(mert, id, question)#
</cfoutput>
<cfreturn />
<cffunction name="getStudentAnswers" >
<cfargument name="student_id" type="string" required="true" >
<cfargument name="question_id" type="string" required="true" >
<cfargument name="question" type="string" required="true" >
<cfquery dataSource="mobileCourse" name="questselecta">
SELECT * FROM dbo.ANSWERS WHERE question_id=#question_id# AND student_id=#student_id#
</cfquery>
<cfif #questselecta.recordcount# gte 1>
<cfoutput query="questselecta">
"answer": "#answer#",
</cfoutput>
<cfelse>
"answer": "",
</cfif>
<cfreturn />

Answer 1

This is not a direct answer to your question. However, even ignoring the errors mentioned in the comments, the code above is not an efficient way to get the job done. It is not necessary to run a separate query for each question in the exam. Just run a single query using a JOIN instead. Since you appear to want all questions, even ones without an answer, make it an OUTER JOIN.
Note: Never use raw parameters in a cfquery because it puts your database at risk for sql injection. Instead use cfqueryparam with whichever cfsqltype matches actual data types of your columns (see documentation matrix).
<!--- adjust cfsqltypes as needed --->
<cfquery name="yourQueryName" ....>
SELECT q.id, q.question, q.question_type, a.answer, ... other columns
FROM Questions q LEFT JOIN Answers a
ON a.question_id = q.question_id
AND a.student_id = <cfqueryparam value="#ARGUMENTS.student_id#"
cfsqltype="cf_sql_integer">
WHERE q.exam_id = <cfqueryparam value="#ARGUMENTS.exam_id#"
cfsqltype="cf_sql_integer">
</cfquery>
Once you have the query results, use it to build your result object. The exact structure depends on your application, but assuming there can be multiple questions - an array of structures would be a good example.
Be sure to properly scope all variables. All function local variables should be var/local scoped to prevent potential threading issues: that includes query names.
<!--- localize all variables --->
<cfset var yourQueryName = "">
<cfset var resultArray = "" >
<cfset var data = "" >
.... run query ....
<!--- first initialize the array --->
<cfset resultArray = []>
<!--- loop through your query and build an array of structures --->
<cfloop query="yourQueryName">
<!--- create new structure to store current question --->
<cfset data = {}>
<cfset data["question_id"] = yourQueryName.question_id>
<cfset data["question"] = yourQueryName.question>
<cfset data["answer"] = yourQueryName.answer>
... other keys ....
<!--- append the question to your array --->
<cfset arrayAppend(resultArray, data)>
</cfloop>
Finally, use serializeJSON to return the array of structures in JSON format:
<cfreturn serializeJSON(resultArray)>