DB.GetLastID() funktioniert wieder und DB.GetInstructors() erstellt für Darstellung in Drop-Down-Menü

packages/data/db.go

@@ -283,15 +283,40 @@ func (db *DB) GetOverviewTableDataByName(n string) (*[]*types.OverviewTableData,
 	return &data, nil
 }
 
-// TODO: So nicht mehr nützlich, zeitnah streichen
-func (db *DB) GetLastID(i *int64) error {
-	row := db.QueryRow("SELECT id" +
-		" FROM " + db.Name +
-		" ORDER BY id DESC LIMIT 0, 1")
+func (db *DB) GetLastID(table string) (int, error) {
+	var id int
 
-	if err := row.Scan(i); err != nil {
-		return fmt.Errorf("*DB.GetLastID: row.Scan(&i): %v\n", err)
+	row := db.QueryRow(`
+  SELECT id
+  FROM ?
+  ORDER BY id DESC
+    LIMIT 0, 1
+  `, table)
+
+	if err := row.Scan(&id); err != nil {
+		return -1, fmt.Errorf("*DB.GetLastID: row.Scan(): %v\n", err)
 	}
 
-	return nil
+	return id, nil
+}
+
+func (db *DB) GetInstructors() (*[]*types.Instructor, error) {
+	rows, err := db.Query(`
+  SELECT *
+  FROM instructors
+  `)
+	if err != nil {
+		return nil, fmt.Errorf("*DB.GetInstructors: db.Query(): %v\n", err)
+	}
+
+	instructors := make([]*types.Instructor, 0)
+	for rows.Next() {
+		instructor := new(types.Instructor)
+		if err = rows.Scan(instructor); err != nil {
+			return nil, fmt.Errorf("*DB.GetInstructors: rows.Scan(): %v\n", err)
+		}
+		instructors = append(instructors, instructor)
+	}
+
+	return &instructors, nil
 }