qry_dat.h

/*
 *  Copyright (C) 2004, Leo Seib, Hannover
 *
 *  Project:Dataset C++ Dynamic Library
 *  Module: FieldValue class and result sets classes header file
 *  Author: Leo Seib      E-Mail: leoseib@web.de
 *  Begin: 5/04/2002
 *
 *  SPDX-License-Identifier: MIT
 *  See LICENSES/README.md for more information.
 */

#pragma once

#include <iostream>
#include <stdint.h>
#include <string>
#include <vector>

namespace dbiplus
{

enum fType
{
  ft_String,
  ft_Boolean,
  ft_Char,
  ft_WChar,
  ft_WideString,
  ft_Short,
  ft_UShort,
  ft_Int,
  ft_UInt,
  ft_Float,
  ft_Double,
  ft_LongDouble,
  ft_Int64,
  ft_Object
};

#ifdef TARGET_WINDOWS_STORE
#pragma pack(push)
#pragma pack(8)
#endif

class field_value
{
private:
  fType field_type;
  std::string str_value;
  union
  {
    bool bool_value;
    char char_value;
    short short_value;
    unsigned short ushort_value;
    int int_value;
    unsigned int uint_value;
    float float_value;
    double double_value;
    int64_t int64_value;
    void* object_value;
  };

  bool is_null;

public:
  field_value();
  explicit field_value(const char* s);
  explicit field_value(const bool b);
  explicit field_value(const char c);
  explicit field_value(const short s);
  explicit field_value(const unsigned short us);
  explicit field_value(const int l);
  explicit field_value(const unsigned int ul);
  explicit field_value(const float f);
  explicit field_value(const double d);
  explicit field_value(const int64_t i);
  field_value(const char* s, std::size_t len);
  field_value(const field_value& fv);
  field_value(field_value&& fv) noexcept;
  ~field_value();

  fType get_fType() const { return field_type; }
  bool get_isNull() const { return is_null; }
  std::string get_asString() const&;
  std::string get_asString() &&;
  bool get_asBool() const;
  char get_asChar() const;
  short get_asShort() const;
  unsigned short get_asUShort() const;
  int get_asInt() const;
  unsigned int get_asUInt() const;
  float get_asFloat() const;
  double get_asDouble() const;
  int64_t get_asInt64() const;

  field_value& operator=(const char* s)
  {
    set_asString(s);
    return *this;
  }
  field_value& operator=(const std::string& s)
  {
    set_asString(s);
    return *this;
  }
  field_value& operator=(std::string&& s)
  {
    set_asString(std::move(s));
    return *this;
  }
  field_value& operator=(const bool b)
  {
    set_asBool(b);
    return *this;
  }
  field_value& operator=(const short s)
  {
    set_asShort(s);
    return *this;
  }
  field_value& operator=(const unsigned short us)
  {
    set_asUShort(us);
    return *this;
  }
  field_value& operator=(const int l)
  {
    set_asInt(l);
    return *this;
  }
  field_value& operator=(const unsigned int l)
  {
    set_asUInt(l);
    return *this;
  }
  field_value& operator=(const float f)
  {
    set_asFloat(f);
    return *this;
  }
  field_value& operator=(const double d)
  {
    set_asDouble(d);
    return *this;
  }
  field_value& operator=(const int64_t i)
  {
    set_asInt64(i);
    return *this;
  }
  field_value& operator=(const field_value& fv);
  field_value& operator=(field_value&& fv) noexcept;

  //class ostream;
  friend std::ostream& operator<<(std::ostream& os, const field_value& fv)
  {
    switch (fv.get_fType())
    {
      case ft_String:
      {
        return os << fv.get_asString();
        break;
      }
      case ft_Boolean:
      {
        return os << fv.get_asBool();
        break;
      }
      case ft_Char:
      {
        return os << fv.get_asChar();
        break;
      }
      case ft_Short:
      {
        return os << fv.get_asShort();
        break;
      }
      case ft_UShort:
      {
        return os << fv.get_asUShort();
        break;
      }
      case ft_Int:
      {
        return os << fv.get_asInt();
        break;
      }
      case ft_UInt:
      {
        return os << fv.get_asUInt();
        break;
      }
      case ft_Float:
      {
        return os << fv.get_asFloat();
        break;
      }
      case ft_Double:
      {
        return os << fv.get_asDouble();
        break;
      }
      case ft_Int64:
      {
        return os << fv.get_asInt64();
        break;
      }
      default:
      {
        return os;
        break;
      }
    }
  }

  void set_isNull() { is_null = true; }
  void set_asString(const char* s);
  void set_asString(const char* s, std::size_t len);
  void set_asString(const std::string& s);
  void set_asString(std::string&& s);
  void set_asBool(const bool b);
  void set_asChar(const char c);
  void set_asShort(const short s);
  void set_asUShort(const unsigned short us);
  void set_asInt(const int l);
  void set_asUInt(const unsigned int l);
  void set_asFloat(const float f);
  void set_asDouble(const double d);
  void set_asInt64(const int64_t i);

  fType get_field_type();
  std::string gft();
};

struct field_prop
{
  std::string name;
};

struct field
{
  field_prop props;
  field_value val;
};

typedef std::vector<field> Fields;
typedef std::vector<field_value> sql_record;
typedef std::vector<field_prop> record_prop;
typedef std::vector<sql_record*> query_data;
typedef field_value variant;

class result_set
{
public:
  result_set() = default;
  ~result_set() { clear(); };
  void clear()
  {
    for (unsigned int i = 0; i < records.size(); i++)
      if (records[i])
        delete records[i];
    records.clear();
    record_header.clear();
  };

  record_prop record_header;
  query_data records;
};

#ifdef TARGET_WINDOWS_STORE
#pragma pack(pop)
#endif
} // namespace dbiplus