Misc minor changes.

pgsql/Pgsql_PgException.h

@@ -1,23 +1,52 @@
-#ifndef PGEXCEPTION_H
+#ifndef PGEXCEPTION_H
 #define PGEXCEPTION_H
 
+#include <cassert>
 #include <stdexcept>
 #include <utility>
 
 namespace Pgsql {
 
-    class PgException {
+	class ResultCode {
+	public:
+		explicit ResultCode(std::string result_code)
+			: m_resultCode(std::move(result_code))
+		{
+			assert(m_resultCode.length() == 5);
+		}
+
+		std::string getClass() const
+		{
+			return m_resultCode.substr(1,2);
+		}
+
+		/** Helper to easily check the class of the error
+		 *
+		 */
+		bool isClass(const std::string_view cls)
+		{
+			return m_resultCode.compare(1, 2, cls);
+		}
+
+		const std::string& getSpecific() const
+		{
+			return m_resultCode;
+		}
+	private:
+		std::string m_resultCode;
+	};
+
+	class PgException: public std::runtime_error {
     public:
         PgException(const char *msg)
-            : message(msg)
+			: std::runtime_error(msg)
         {}
         PgException(std::string msg)
-             : message(std::move(msg))
-        {}
+			: std::runtime_error(msg)
+		{}
        
         
     private:
-        std::string message;
         
     };
     
@@ -25,14 +54,21 @@ namespace Pgsql {
     public:
         PgResultError(std::string msg, std::string result_code)
             : PgException(std::move(msg))
+			, m_resultCode(result_code)
         {}
+
+		ResultCode getResultCode() const { return m_resultCode; }
+	private:
+		ResultCode m_resultCode;
     };
     
-    class PgConnectionError: public PgResultError, std::runtime_error {
+	class PgConnectionError: public PgResultError {
+	public:
         PgConnectionError(const std::string &msg, std::string result_code)
             : PgResultError(msg, std::move(result_code))
-            , std::runtime_error(msg)
         {}
+
+	private:
         
     };