Add structs and corresponding API routes

struct/tag.go

@@ -0,0 +1,75 @@
+package ckh
+
+import ()
+
+type Tag struct {
+	Id    int64  `json:"id"`
+	Label string `json:"label"`
+}
+
+func GetTags() (tags []Tag, err error) {
+	if rows, errr := DBQuery("SELECT id_tag, label FROM tags"); errr != nil {
+		return nil, errr
+	} else {
+		defer rows.Close()
+
+		tags = make([]Tag, 0)
+		for rows.Next() {
+			var t Tag
+			if err = rows.Scan(&t.Id, &t.Label); err != nil {
+				return
+			}
+			tags = append(tags, t)
+		}
+		if err = rows.Err(); err != nil {
+			return
+		}
+
+		return
+	}
+}
+
+func GetTag(id int64) (t Tag, err error) {
+	err = DBQueryRow("SELECT id_tag, label FROM tags WHERE id_tag = ?", id).Scan(&t.Id, &t.Label)
+	return
+}
+
+func NewTag(label string) (Tag, error) {
+	if res, err := DBExec("INSERT INTO tags (label) VALUES (?)", label); err != nil {
+		return Tag{}, err
+	} else if tid, err := res.LastInsertId(); err != nil {
+		return Tag{}, err
+	} else {
+		return Tag{tid, label}, nil
+	}
+}
+
+func (t Tag) Update() (int64, error) {
+	if res, err := DBExec("UPDATE tags SET label = ? WHERE id_tag = ?", t.Label, t.Id); err != nil {
+		return 0, err
+	} else if nb, err := res.RowsAffected(); err != nil {
+		return 0, err
+	} else {
+		return nb, err
+	}
+}
+
+func (t Tag) Delete() (int64, error) {
+	if res, err := DBExec("DELETE FROM tags WHERE id_tag = ?", t.Id); err != nil {
+		return 0, err
+	} else if nb, err := res.RowsAffected(); err != nil {
+		return 0, err
+	} else {
+		return nb, err
+	}
+}
+
+func ClearTags() (int64, error) {
+	if res, err := DBExec("DELETE FROM tags"); err != nil {
+		return 0, err
+	} else if nb, err := res.RowsAffected(); err != nil {
+		return 0, err
+	} else {
+		return nb, err
+	}
+}