let Finder::page() takes a page number and not an offset

src/dbexpression.cpp

@@ -296,7 +296,7 @@ DbExpression & DbExpression::group_end(pt::TextStream & stream)
 
 DbExpression & DbExpression::page(pt::TextStream & stream, size_t page_number, size_t page_size)
 {
-	stream << " LIMIT " << page_number << "," << page_size << " ";
+	stream << " LIMIT " << (page_number*page_size) << "," << page_size << " ";
 	return *this;
 }
 

src/dbexpression.h

@@ -64,6 +64,9 @@ public:
 	virtual DbExpression & group_and(pt::TextStream & stream);
 	virtual DbExpression & group_end(pt::TextStream & stream);
 
+	/*
+	 * page_number starts from zero (it's a number of a page, not an offset)
+	 */
 	virtual DbExpression & page(pt::TextStream & stream, size_t page_number, size_t page_size);
 
 	template<typename FieldValue>

src/finder.h

@@ -589,7 +589,9 @@ public:
 
 
 
-
+	/*
+	 * page_number start from zero (it's a number of a page, not an offset)
+	 */
 	Finder<ModelClass> & page(size_t page_number, size_t page_size)
 	{
 		if( out_stream && db_expression )

src/postgresqlexpression.cpp

@@ -100,7 +100,7 @@ void PostgreSQLExpression::esc(const pt::Date & date, pt::TextStream & stream, c
 
 DbExpression & PostgreSQLExpression::page(pt::TextStream & stream, size_t page_number, size_t page_size)
 {
-	stream << " OFFSET " << page_number << " LIMIT " << page_size << " ";
+	stream << " OFFSET " << (page_number*page_size) << " LIMIT " << page_size << " ";
 	return *this;
 }