added noop_connection for testing

include/matador/sql/backend_provider.hpp

@@ -6,6 +6,7 @@
 #include <memory>
 #include <string>
 #include <unordered_map>
+#include <unordered_set>
 
 namespace matador::sql {
 
@@ -26,28 +27,50 @@ public:
   const dialect& connection_dialect(const std::string &connection_type);
 
 private:
-  struct backend_context {
-    backend_context(const std::string &connection_type,
-                    const std::string &backends_path);
+  struct basic_backend_context {
+    virtual ~basic_backend_context() = default;
+    [[nodiscard]] virtual connection_impl* create(const connection_info&) = 0;
+    virtual void destroy(connection_impl*) = 0;
+    [[nodiscard]] virtual const sql::dialect* dialect() const = 0;
+  };
+
+  class backend_context final : public basic_backend_context {
+  public:
+    explicit backend_context(const std::string &connection_type);
     backend_context(const backend_context&) = delete;
     backend_context& operator=(const backend_context&) = delete;
     backend_context(backend_context&&) noexcept = default;
     backend_context& operator=(backend_context&&) noexcept = default;
-    ~backend_context();
+    ~backend_context() override;
 
+    [[nodiscard]] connection_impl* create(const connection_info&) override;
+    void destroy(connection_impl *conn) override;
+    [[nodiscard]] const class dialect* dialect() const override;
+
+  private:
     typedef connection_impl*(*create_func)(const connection_info&);
     typedef void (*destroy_func)(connection_impl*);
-    typedef const dialect*(*dialect_func)();
+    typedef const class dialect*(*dialect_func)();
 
     create_func create_connection{};
     destroy_func destroy_connection{};
     dialect_func get_dialect{};
     utils::library lib;
   };
+
+  class noop_backend_context final : public basic_backend_context {
+  public:
+    connection_impl *create(const connection_info &info) override;
+    void destroy(connection_impl *impl) override;
+    [[nodiscard]] const sql::dialect *dialect() const override;
+
+  private:
+    std::unordered_set<std::unique_ptr<connection_impl>> noop_connections_;
+  };
+
 private:
-  using backends_t = std::unordered_map<std::string, std::unique_ptr<backend_context>>;
+  using backends_t = std::unordered_map<std::string, std::unique_ptr<basic_backend_context>>;
   backends_t backends_;
-  std::string backends_path_;
 };
 }
 #endif //QUERY_BACKEND_PROVIDER_HPP

include/matador/sql/noop_connection.hpp

@@ -0,0 +1,26 @@
+#ifndef QUERY_NOOP_CONNECTION_HPP
+#define QUERY_NOOP_CONNECTION_HPP
+
+#include "matador/sql/connection_impl.hpp"
+
+namespace matador::sql {
+
+class noop_connection final : public connection_impl
+{
+public:
+  explicit noop_connection(const connection_info &info);
+
+  void open() override;
+  void close() override;
+  bool is_open() override;
+  size_t execute(const std::string &stmt) override;
+  std::unique_ptr<query_result_impl> fetch(const std::string &stmt) override;
+  std::unique_ptr<statement_impl> prepare(query_context context) override;
+  record describe(const std::string &table) override;
+  bool exists(const std::string &schema_name, const std::string &table_name) override;
+
+private:
+  bool is_open_{false};
+};
+}
+#endif //QUERY_NOOP_CONNECTION_HPP

include/matador/sql/query_data.hpp

@@ -9,14 +9,13 @@
 
 namespace matador::sql {
 
+class query_part;
+
 struct query_data
 {
 //  SqlCommands command;
   std::vector<std::unique_ptr<query_part>> parts;
   std::vector<column_definition> columns;
-  std::unordered_map<std::type_index, table> table_map_by_index;
-  using table_ref = std::reference_wrapper<table>;
-  std::unordered_map<std::string, table_ref> table_map_by_name;
 };
 
 }

include/matador/sql/query_intermediates.hpp

@@ -240,8 +240,7 @@ public:
     if (!schema_->exists<Type>()) {
       schema_->attach<Type>(table.name);
     }
-    data_.parts.push_back(std::make_unique<query_create_table_part>(table, column_generator::generate<Type>(*schema_)));
-    return {connection_, schema_, data_};
+    return this->table(table, column_generator::generate<Type>(*schema_));
   }
 };
 
@@ -261,7 +260,7 @@ public:
   query_into_intermediate into(const sql::table &table, std::initializer_list<column> column_names);
   template<class Type>
   query_into_intermediate into(const sql::table &table)
-  {;
+  {
     data_.parts.push_back(std::make_unique<query_into_part>(table, column_name_generator::generate<Type>(*schema_)));
     return {connection_, schema_, data_};
   }