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pgsql/Pgsql_Result.h

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+#ifndef PGSQL_RESULT_H
+#define PGSQL_RESULT_H
+
+#include "Pgsql_Row.h"
+
+namespace Pgsql {
+
+	class ErrorDetails {
+	public:
+		static ErrorDetails createErrorDetailsFromPGresult(const PGresult *res);
+
+		std::string errorMessage;
+		std::string state; ///< PG_DIAG_SQLSTATE Error code as listed in	https://www.postgresql.org/docs/9.5/static/errcodes-appendix.html
+		std::string severity;
+		std::string messagePrimary;
+		std::string messageDetail;
+		std::string messageHint;
+		int statementPosition; ///< First character is one, measured in characters not bytes!
+		int internalPosition;
+		std::string internalQuery;
+		std::string context;
+		std::string schemaName;
+		std::string tableName;
+		std::string columnName;
+		std::string datatypeName;
+		std::string constraintName;
+		std::string sourceFile;
+		std::string sourceLine;
+		std::string sourceFunction;
+	};
+
+	/** \brief Non-copyable but movable wrapper for a postgresql result.
+	 *
+	 * This class makes sure the result is removed from memory. It also supplies an iterator for the
+	 * rows from the result facilitating also the use of the cpp for each.
+	 */
+	class Result {
+	public:
+		class const_iterator {
+		public:
+			const_iterator(const Result &r, int rw)
+				: m_row(r, rw)
+			{}
+
+			const_iterator operator++()
+			{
+				const_iterator t(*this);
+				m_row.next();
+				return t;
+			}
+
+			const_iterator& operator++(int)
+			{
+				m_row.next();
+				return *this;
+			}
+
+			bool operator==(const const_iterator &rhs)
+			{
+				return m_row == rhs.m_row;
+			}
+
+			bool operator!=(const const_iterator &rhs)
+			{
+				return !operator==(rhs);
+			}
+
+			const Row& operator*()
+			{
+				return m_row;
+			}
+			const Row& operator->()
+			{
+				return m_row;
+			}
+
+		private:
+			Row m_row;
+		};
+
+		Result() = default;
+		Result(PGresult *result);
+		~Result();
+
+		Result(const Result &rhs) = delete;
+		Result& operator=(const Result &rhs) = delete;
+
+		Result(Result &&rhs);
+		Result& operator=(Result &&rhs);
+
+		operator bool() const;
+
+		ExecStatusType resultStatus();
+
+		std::string getResStatus();
+
+		/** Use this to retrieve an error code when this is an error result
+		 *
+		 * The possible code are listed in https://www.postgresql.org/docs/9.5/static/errcodes-appendix.html
+		 */
+		std::string diagSqlState();
+		/** Retrieves all the error fields. */
+		ErrorDetails diagDetails();
+
+		const_iterator begin() const
+		{
+			return const_iterator(*this, 0);
+		}
+
+		const_iterator end() const
+		{
+			return const_iterator(*this, rows());
+		}
+
+		int tuplesAffected() const;
+		int rows() const;
+		int cols() const;
+
+		const char* getColName(int idx) const;
+
+		const char* val(int col, int row) const;
+		Value get(int col, int row) const;
+		Oid type(int col) const;
+		bool null(int col, int row) const;
+
+
+	//		iterator begin();
+	private:
+		PGresult *result = nullptr;
+	};
+
+
+} // end namespace Pgsql
+
+
+#endif // PGSQL_RESULT_H