field.h

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/* Copyright(C) 1999, 2000 by JiangSu Bell Software CO.,LTD. */
/*
  Name: field.h                          Version: 1.0.0
  Created by HanBing                     Date: 2000-08-08
  Comment:
  Modified:
1)  2000-08-08	HanBing	-	Create;
*/

#ifndef __FIELD__
#define __FIELD__   

/* Define Data types for Field */
typedef enum DataBaseTypes
{
  VoidT,
  IntT,
  FloatT,
  CharT
} DataType;

/*
  Class: CField                        Version: 1.0
  Created by HanBing                   Date: 2000-08-08
  Implementation File: field.cpp
  Comment:
  Modified
1)  2000-08-08	HanBing	-	Create;
*/
class CField
{
  public:
    CField( const char *pcName=NULL, DataType type=VoidT, unsigned short len=255, unsigned short key=0 );
    ~CField();
/* oprators for copy */
    CField& operator = ( CField& Field );

/* oprators for set value */
    long   operator = ( long Value );
    inline int operator = ( int Value )
    {
      return (long)operator = ( long(Value) );
    }

    double operator = ( double Value );
    inline float operator = ( float Value )
    {
      return (float)operator = ( double(Value) );
    }

    char*  operator = ( const char* Value );

/* functions for get value */
    long&   Int();
    double& Float();
    char*  Char();

    /*
      Name: Buff()
      Create by HanBing					           Date: 2000-08-08
      Define in Class: CField	             File: field.h
      Comment:      Get the Field's buffer pointer;
      Parameters:
      Return Value: the Field' buffer pointer
      Modified:
    1) 2000-08-08	HanBing	-	Create;
    */
    inline unsigned char* Buff()
    {
      return (unsigned char*)FieldValue;
    }

    /* Set the Field's name */
    void SetName( const char *pcName );
    /* Set the Field's type and length */
    void SetType( DataType type, unsigned short len );
    /* Set the Field's key */
    void SetKey( unsigned short order );
    void Set( const char *pcName=NULL, DataType type=VoidT, unsigned short len=255, unsigned short key=0 )
    {
      SetName( pcName );
      if ( type != FieldType || len!= FieldLen )
        SetType( type, len );
      SetKey( key );
    }
    /*
      Name: Name()
      Create by HanBing					           Date: 2000-08-08
      Define in Class: CField	             File: field.h
      Comment:      Get the Field's name;
      Parameters:
      Return Value: the Field's name;
      Modified:
    1) 2000-08-08	HanBing	-	Create;
    */
    inline const char* Name()
    {
	    return FieldName;
    }

    /*
      Name: Type()
      Create by HanBing					           Date: 2000-08-08
      Define in Class: CField	             File: field.h
      Comment:      Get the Field's type;
      Parameters:
      Return Value: the Field's type;
      Modified:
    1) 2000-08-08	HanBing	-	Create;
    */
    inline DataType Type()
    {
	    return FieldType;
    }

    /*
      Name: Len()
      Create by HanBing					           Date: 2000-08-08
      Define in Class: CField	             File: field.h
      Comment:      Get the Field's Length;
      Parameters:
      Return Value: the Field's Length;
      Modified:
    1) 2000-08-08	HanBing	-	Create;
    */
    inline unsigned short Len()
    {
      return FieldLen;
    }

    /*
      Name: Key()
      Create by HanBing					           Date: 2000-08-08
      Define in Class: CField	             File: field.h
      Comment:      Get the Field's Key order;
      Parameters:
      Return Value: if the Field is not a key, return 0
                    else return the key's order
      Modified:
    1) 2000-08-08	HanBing	-	Create;
    */
    inline unsigned short Key()
    {
      return KeyOrder;
    }

    /*
      Name: IsNull()
      Create by HanBing					           Date: 2000-08-08
      Define in Class: CField	             File: field.h
      Comment:      Get whether the Field's value is NULL;
      Parameters:
      Return Value: if the Field's value is NULL, return true
                    else return false
      Modified:
    1) 2000-08-08	HanBing	-	Create;
    */
    inline bool IsNull()
    {
      return ( Null ? true : false );
    }

    inline void SetNull()
    {
      Null = -1;
    }

    inline short& State()
    {
      return Null;
    }

    void Print();

  private:
    char *FieldName;
    void *FieldValue;
    DataType FieldType;
    unsigned short FieldLen;
    unsigned short KeyOrder;
    short Null;
};

#endif __FIELD__