implemented sqlite fetch

backends/sqlite/include/sqlite_connection.hpp

@@ -31,6 +31,8 @@ public:
 
   size_t execute(const std::string &stmt) override;
 
+  sql::record describe(const std::string& table) override;
+
 private:
   static int parse_result(void* param, int column_count, char** values, char** columns);
 

backends/sqlite/include/sqlite_query_result.hpp

@@ -9,6 +9,8 @@ namespace matador::backends::sqlite {
 
 class sqlite_query_result : public sql::query_result_impl {
 public:
+  ~sqlite_query_result() override;
+
   void read_value(const char *id, size_t index, char &value) override;
   void read_value(const char *id, size_t index, short &value) override;
   void read_value(const char *id, size_t index, int &value) override;
@@ -25,9 +27,10 @@ public:
   void read_value(const char *id, size_t index, char *value, size_t size) override;
   void read_value(const char *id, size_t index, std::string &value) override;
   void read_value(const char *id, size_t index, std::string &value, size_t s) override;
+  void read_value(const char *id, size_t index, sql::any_type &value, sql::data_type_t type, size_t size) override;
 
-protected:
-  [[nodiscard]] bool next_row() override;
+  [[nodiscard]] const char* column(size_t index) const override;
+  [[nodiscard]] bool fetch() override;
 
 private:
   friend class sqlite_connection;
@@ -40,8 +43,7 @@ private:
   using rows = std::vector<columns>;
 
   rows result_;
-  size_t row_index_ = 0;
-
+  long long row_index_ = -1;
 };
 
 }