added where condition

include/matador/sql/dialect.hpp

@@ -6,10 +6,11 @@
 #include <cstdint>
 #include <string>
 #include <unordered_map>
+#include <vector>
 
 namespace matador::sql {
 
-class dialect
+class [[nodiscard]] dialect
 {
 public:
   enum class token_t : uint8_t
@@ -52,6 +53,14 @@ public:
     NONE
   };
 
+  /**
+   * @brief Enum representing the compile type
+   */
+  enum class compile_type_t : uint8_t {
+    PREPARED, /**< Compile type for prepared statements */
+    DIRECT    /**< Compile type for direct execute statements */
+  };
+
   /**
    * Holding enums concerning escaping identifiers
    */
@@ -110,9 +119,28 @@ public:
    */
   virtual escape_identifier_t identifier_escape_type() const;
 
+  /**
+   * Generates a next placeholder string. default is
+   * question mark '?'
+   *
+   * @return Placeholder string
+   */
+  virtual std::string next_placeholder() const;
+
+  compile_type_t compile_type() const;
+  void add_host_var(const std::string &host_var);
+  void add_column(const std::string &column);
+
+  const std::vector<std::string>& host_vars() const;
+  const std::vector<std::string>& columns() const;
+
 private:
   using token_to_string_map = std::unordered_map<token_t, std::string>;
 
+  compile_type_t compile_type_ = compile_type_t::DIRECT;
+  std::vector<std::string> host_vars_;
+  std::vector<std::string> columns_;
+
   token_to_string_map tokens_ {
     {token_t::CREATE, "CREATE"},
     {token_t::DROP, "DROP"},