SQL Next not advancing cursor - sql

Question

I have a function that I used to iterate over a result set from a query:
func readRows(rows *sql.Rows, translator func(*sql.Rows) error) error {
defer rows.Close()
// Iterate over each row in the rows and scan each; if an error occurs then return
for shouldScan := rows.Next(); shouldScan; {
if err := translator(rows); err != nil {
return err
}
}
// Check if the rows had an error; if they did then return them. Otherwise,
// close the rows and return an error if the close function fails
if err := rows.Err(); err != nil {
return err
}
return nil
}
The translator function is primarily responsible for calling Scan on the *sql.Rows object. An example of this is:
readRows(rows, func(scanner *sql.Rows) error {
var entry gopb.TestObject
// Embed the variables into a list that we can use to pull information out of the rows
scanned := []interface{}{...}
if err := scanner.Scan(scanned...); err != nil {
return err
}
entries = append(entries, &entry)
return nil
})
I wrote a unit test for this code:
// Create the SQL mock and the RDS reqeuster
db, mock, _ := sqlmock.New()
requester := Requester{conn: db}
defer db.Close()
// Create the rows we'll use for testing the query
rows := sqlmock.NewRows([]string{"id", "data"}).
AddRow(0, "data")
// Verify the command order for the transaction
mock.ExpectBegin()
mock.ExpectQuery(regexp.QuoteMeta("SELECT `id`, `data`, FROM `data`")).WillReturnRows(rows)
mock.ExpectRollback()
// Attempt to get the data
data, err := requester.GetData(context.TODO())
However, it appears that Next is being called infinitely. I'm not sure if this is an sqlmock issue or an issue with my code. Any help would be appreciated.