func readFromDb(queries string) webData {
//Reading from database
log.Println("Refreshing database read")
tempData := newWebData()
var (
url string
title string
id int
state string
body string
creation_date int64
last_edit_time sql.NullInt64
owner sql.NullInt64
name sql.NullString
pic sql.NullString
link sql.NullString
)
//Select all questions in the database and read into a new data object
query := "SELECT * FROM questions LEFT JOIN user ON questions.user=user.id"
if queries != "" {
query = query + " WHERE state='unanswered' OR " + queries
}
rows, err := db.Query(query)
if err != nil {
log.Fatal("query failed:\t", err)
}
defer rows.Close()
//Iterate through each row and add to the correct cache
for rows.Next() {
err := rows.Scan(&id, &title, &url, &state, &owner, &body, &creation_date, &last_edit_time, &owner, &name, &pic, &link)
currentQ := stackongo.Question{
Question_id: id,
Title: title,
Link: url,
Body: body,
Creation_date: creation_date,
}
if last_edit_time.Valid {
currentQ.Last_edit_date = last_edit_time.Int64
}
if err != nil {
log.Fatal("query failed:\t", err)
}
var tagToAdd string
//Get tags for that question, based on the ID
tagRows, err := db.Query("SELECT tag from question_tag where question_id = ?", currentQ.Question_id)
if err != nil {
log.Fatal("Tag retrieval failed!\t", err)
}
defer tagRows.Close()
for tagRows.Next() {
err := tagRows.Scan(&tagToAdd)
if err != nil {
log.Fatal("Could not scan for tag!\t", err)
}
currentQ.Tags = append(currentQ.Tags, tagToAdd)
}
//Switch on the state as read from the database to ensure question is added to correct cace
tempData.Caches[state] = append(tempData.Caches[state], currentQ)
if owner.Valid {
user := stackongo.User{
User_id: int(owner.Int64),
Display_name: name.String,
Profile_image: pic.String,
}
tempData.Qns[id] = user
if _, ok := tempData.Users[user.User_id]; !ok {
tempData.Users[user.User_id] = newUser(user, "")
}
tempData.Users[user.User_id].Caches[state] = append(tempData.Users[user.User_id].Caches[state], currentQ)
}
}
for cacheType, _ := range tempData.Caches {
sort.Sort(byCreationDate(tempData.Caches[cacheType]))
}
mostRecentUpdate = time.Now().Unix()
return tempData
}
// Returns questions and user data from the db filtered by parameters
func readFromDb(ctx context.Context, params string) (webData, int64, error) {
log.Infof(ctx, "Refreshing database read")
tempData := newWebData()
var (
url string
title string
id int
state string
body string
creation_date int64
last_edit_time sql.NullInt64
owner sql.NullInt64
name sql.NullString
pic sql.NullString
link sql.NullString
)
//Select all questions in the database and read into a new data object
query := "SELECT * FROM questions LEFT JOIN user ON questions.user=user.id"
if params != "" {
query += " WHERE " + params
}
log.Infof(ctx, "query: %v", query)
rows, err := db.Query(query)
if err != nil {
return tempData, 0, fmt.Errorf("query failed: %v", err.Error())
}
defer rows.Close()
//Iterate through each row and add to the correct cache
for rows.Next() {
err := rows.Scan(&id, &title, &url, &state, &owner, &body, &creation_date, &last_edit_time, &owner, &name, &pic, &link)
if err != nil {
log.Errorf(ctx, "query failed: %v", err)
continue
}
currentQ := stackongo.Question{
Question_id: id,
Title: title,
Link: url,
Body: body,
Creation_date: creation_date,
}
if last_edit_time.Valid {
currentQ.Last_edit_date = last_edit_time.Int64
}
var tagToAdd string
//Get tags for that question, based on the ID
tagRows, err := db.Query("SELECT tag FROM question_tag WHERE question_id = ?", currentQ.Question_id)
if err != nil {
log.Errorf(ctx, "Tag retrieval failed: %v", err.Error())
continue
}
defer tagRows.Close()
for tagRows.Next() {
err := tagRows.Scan(&tagToAdd)
if err != nil {
log.Errorf(ctx, "Could not scan for tag: %v", err.Error())
continue
}
currentQ.Tags = append(currentQ.Tags, tagToAdd)
}
//Switch on the state as read from the database to ensure question is added to correct cace
tempData.Caches[state] = append(tempData.Caches[state], currentQ)
if owner.Valid {
user := stackongo.User{
User_id: int(owner.Int64),
Display_name: name.String,
Profile_image: pic.String,
}
tempData.Qns[id] = user
if _, ok := tempData.Users[user.User_id]; !ok {
tempData.Users[user.User_id] = newUser(user)
}
tempData.Users[user.User_id].Caches[state] = append(tempData.Users[user.User_id].Caches[state], currentQ)
}
}
for cacheType, _ := range tempData.Caches {
sort.Sort(byCreationDate(tempData.Caches[cacheType]))
}
return tempData, time.Now().Unix(), nil
}