Go language Query column referencing not working - sql

Question

I have a query in GO that returns a different response from mysql.
here is the query:
SELECT DISTINCT
questions.id as question_id,
questions.question,
questions.priority,
questions.type
FROM questions
LEFT JOIN profile ON profile.user_id = ?
LEFT JOIN group ON group.user_id = profile.user_id
WHERE questions.status = 1
AND group.status = 1
AND questions.id NOT IN (SELECT DISTINCT question_id FROM answers WHERE user_id = profiles.user_id)
When I run this on mysql terminal it returns nothing as expected. But when I try to run this on GO lang it has a return which is not supposed to be returned since it has already been filtered in the NOT IN clause which are all the answered questions. When I tried to change the profiles.user_id to a specific value it returns the expected output.
I think the use of column parameters in not working in GO. It will be a quick fix if I change the users.profile to a specific variable but there are other queries that needs to use that feature in order to achieve my expected output.
I tried using stmt.Prepared statement and the db.Query() with same results
Go code:
query := " SELECT DISTINCT " +
" questions.id as question_id, " +
" questions.question, " +
" questions.priority, " +
" questions.type " +
" FROM questions " +
" LEFT JOIN profile ON profile.user_id = 1627 " +
" LEFT JOIN group ON group.user_id = profile.user_id " +
" WHERE questions.status = 1 " +
" AND group.status = 1 " +
" AND questions.id NOT IN (SELECT DISTINCT question_id FROM answers WHERE user_id = profiles.user_id); "
stmt, err := db.Prepare(query)
if err != nil {
checkErr(err) // proper error handling instead of panic in your app
}
defer stmt.Close() // Close the statement when we leave main() / the program terminates
userId := json.userId
args := []interface{}{}
args = append(args, userId)
start := time.Now()
rows, err := stmt.Query(args...)
elapsed := time.Since(start)
if err != nil {
checkErr(err) // proper error handling instead of panic in your app
}
// Fetch rows
for rows.Next() {
// get RawBytes from data
err = rows.Scan(&question.QuestionId, &question.Question, &question.Priority, &question.Type)
questions = append(questions, question)
if err != nil {
checkErr(err) // proper error handling instead of panic in your app
}
}
defer rows.Close()
defer db.Close()
Is there any workaround for it to work ?
Thanks for your response

Answer 1

You can use question mark '?' in the query in places where you expect a parameter:
age := 27
rows, err := db.Query("SELECT name FROM users WHERE age=?", age)
if err != nil {
log.Fatal(err)
}
defer rows.Close()
for rows.Next() {
var name string
if err := rows.Scan(&name); err != nil {
log.Fatal(err)
}
fmt.Printf("%s is %d\n", name, age)
}
if err := rows.Err(); err != nil {
log.Fatal(err)
}
Also, you can use back tick ` for a multi-line string in your code (rather than concatenation with +). It would make your code easier to read.
query := `SELECT DISTINCT
questions.id as question_id,
questions.question,
questions.priority,
questions.type
FROM questions
LEFT JOIN profile ON profile.user_id = 1627
LEFT JOIN group ON group.user_id = profile.user_id
WHERE questions.status = 1
AND group.status = 1
AND questions.id NOT IN (SELECT DISTINCT question_id FROM answers WHERE user_id = profiles.user_id); `