allow to set a custom name for the auto generated rows counter column

src/dbexpression.cpp

@@ -5,7 +5,7 @@
  */
 
 /*
- * Copyright (c) 2018-2022, Tomasz Sowa
+ * Copyright (c) 2018-2023, Tomasz Sowa
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -350,19 +350,29 @@ void DbExpression::add_rows_counter_column(Model & model)
 	{
 		field_before();
 		(*out_stream) << "COUNT(*) OVER() AS ";
+		before_field_name();
 
-		pt::TextStream str;
+		if( model.model_env->rows_counter_column_name.empty() )
-		generate_rows_counter_column_name(*model.model_env, str);
-
-		if( !model.model_env->has_autogenerated_select )
 		{
-			str.to_str(model.model_env->rows_counter_column_name);
+			pt::TextStream str;
+			generate_rows_counter_column_name(*model.model_env, str);
+			esc(str, *out_stream);
+
+			/*
+			 * for autogenerated selects we don't have to copy the rows_counter_column_name
+			 * because a field() method will use an index instead of this name
+			 */
+			if( !model.model_env->has_autogenerated_select )
+			{
+				str.to_str(model.model_env->rows_counter_column_name);
+			}
+		}
+		else
+		{
+			esc(model.model_env->rows_counter_column_name, *out_stream);
 		}
 
-		before_field_name();
-		esc(str, *out_stream);
 		after_field_name();
-
 		field_after();
 	}
 }

src/finder.h

@@ -63,6 +63,7 @@ public:
 		db_expression = nullptr;
 		was_query_error = false;
 		model_data = nullptr;
+		rows_counter_name = nullptr;
 	}
 
 
@@ -73,6 +74,7 @@ public:
 		db_expression = nullptr;
 		was_query_error = false;
 		model_data = nullptr;
+		rows_counter_name = nullptr;
 	}
 
 	Finder(ModelConnector & model_connector)
@@ -82,6 +84,7 @@ public:
 		db_expression = nullptr;
 		was_query_error = false;
 		model_data = nullptr;
+		rows_counter_name = nullptr;
 		set_out_stream();
 	}
 
@@ -92,6 +95,7 @@ public:
 		db_expression = nullptr;
 		was_query_error = false;
 		model_data = nullptr;
+		rows_counter_name = nullptr;
 		set_out_stream();
 	}
 
@@ -102,6 +106,7 @@ public:
 		db_expression = nullptr;
 		was_query_error = false;
 		model_data = nullptr;
+		rows_counter_name = nullptr;
 	}
 
 	Finder(pt::TextStream & out_stream, ModelConnector * model_connector)
@@ -111,6 +116,7 @@ public:
 		db_expression = nullptr;
 		was_query_error = false;
 		model_data = nullptr;
+		rows_counter_name = nullptr;
 	}
 
 	Finder<ModelClass> & set_connector(ModelConnector * model_connector)
@@ -151,6 +157,17 @@ public:
 		return *this;
 	}
 
+	Finder<ModelClass> & set_rows_counter_name(const wchar_t * rows_counter_name)
+	{
+		this->rows_counter_name = rows_counter_name;
+		return *this;
+	}
+
+	Finder<ModelClass> & set_rows_counter_name(const std::wstring & rows_counter_name)
+	{
+		this->rows_counter_name = &rows_counter_name;
+		return *this;
+	}
 
 	bool was_error()
 	{
@@ -1228,6 +1245,9 @@ protected:
 		model_env.finder_helper = &finder_helper;
 		model_env.model = &model;
 
+		if( rows_counter_name )
+			model_env.rows_counter_column_name = rows_counter_name;
+
 		model.model_env = &model_env;
 		model.table();
 		model.model_env->add_table_name_to_finder_helper();
@@ -1340,7 +1360,7 @@ private:
 	FinderHelper finder_helper;
 	ModelData * model_data;
 	bool use_table_prefix_for_fetching;
-
+	const wchar_t * rows_counter_name;
 
 
 	void set_db_expression()