sql_buffer.h

#ifndef _SQL_BUFFER_H
#define _SQL_BUFFER_H
/*
 * Fledge storage service.
 *
 * Copyright (c) 2017 OSisoft, LLC
 *
 * Released under the Apache 2.0 Licence
 *
 * Author: Mark Riddoch
 */

#include <string>
#include <list>

#define BUFFER_CHUNK    1024

class SQLBuffer {
    class Buffer {
        public:
            Buffer();
            Buffer(unsigned int);
            ~Buffer();
            char        *detach();
            char        *data;
            unsigned int    offset;
            unsigned int    length;
            bool        attached;
    };

        public:
                SQLBuffer();
                ~SQLBuffer();

        bool            isEmpty() { return buffers.empty() || (buffers.size() == 1 && buffers.front()->offset == 0); }
        void            append(const char);
        void            append(const char *);
        void            append(const int);
        void            append(const unsigned int);
        void            append(const long);
        void            append(const unsigned long);
        void            append(const double);
        void            append(const std::string&);
        void            quote(const std::string&);
        const char      *coalesce();
        void            clear();

    private:
        std::list<Buffer *> buffers;
};

#endif