added better database get api

src/database/database.hpp

@@ -21,14 +21,27 @@ public:
     bool exec(const char* sqlQuery);
     bool exec(const std::string& sqlQuery);
 
-    /// returns true if the sql statment returns at least one row 
-    std::optional<int64_t> getInt(const char* sql);
-
     std::optional<int64_t> insert(const char* sql);
 
     std::set<std::string> getStrSet(const std::string& sql);
 
-    std::string getStr(const std::string sql, const QueryData& data);
+    template <typename T>
+    std::optional<T> get(const std::string sql, const QueryData& data){
+        sqlite3_stmt* stmt = bind(sql, data);
+        T ret;
+        if ((stmt == nullptr) || (sqlite3_step(stmt) != SQLITE_ROW))
+            return {}; 
+
+        if constexpr (std::is_same_v<T, int>) {
+            ret = sqlite3_column_int64(stmt, 0); 
+        }
+        else if constexpr (std::is_same_v<T, std::string>){
+            ret = reinterpret_cast<const char*>(sqlite3_column_text(stmt, 0));
+        }
+        
+        sqlite3_finalize(stmt);
+        return ret;
+    }
 
     sqlite3_stmt* bind(const std::string sql, const QueryData& data);