sql_query.go

sql := "SELECT * FROM foo WHERE foo.name = $1"
args = append(args, "fred")

someArg := r.URL.Query().Get("some_arg")
someArg2 := r.URL.Query().Get("some_arg_2")

if someArg != "" {
	args = append(args, someArg)
	sql += " AND foo.some_arg = $" + strconv.Itoa(len(args))
}

if someArg2 != "" {
	args = append(args, someArg2)
	sql += " AND foo.some_arg_2 = $" + strconv.Itoa(len(args))
}

rows, qerr := db.Query(sql, args...)