attribute.cpp

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// Attribute.cpp: implementation of the CAttribute class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "Database.h"
#include "Attribute.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CAttribute::CAttribute()
{
    tree=NULL;	
}


CAttribute::CAttribute(CString s,CString t,UINT le,bool unique
					   ,bool pk,bool nll,UINT rr,WORD ra)
{
	idx=0;
	unq=unique;
    ispk=BYTE(pk);///////////////////////////////////////9.16
	can_null=BYTE(nll);///////////////////////////////////9.16

	tree=NULL;
    IndexMainFile=0;
	offset=0;
	if(s.GetLength()>10)
	{
	    name=s.Left(10);
		name_length=(10+1);
	}
	else
	{
		name=s;
		name_length=(s.GetLength()+1);
	}

	
	rf_relationship=rr;
	rf_Attribute=ra;
	if(!t.CompareNoCase("int"))
	{
		type=INT_TYPE;
	    length=4;
	}
	else if(!t.CompareNoCase("float"))
	{
		type=FLOAT_TYPE;
        length=4;
	}
	else if(!t.CompareNoCase("char"))
	{
		type=CHAR_TYPE;
        length=le;
	}
	else if(!t.CompareNoCase("varchar"))
	{
		type=VARCHAR_TYPE;
		length=le;
	}
	else if(!t.CompareNoCase("date"))
	{
		type=DATE_TYPE;
	    length=11;
	}
	else if(!t.CompareNoCase("time"))
	{
		type=TIME_TYPE;
        length=9;
	}
    //else 出错
}
/*CAttribute::CAttribute(BYTE nl,CString s,BYTE t,UINT le,UINT rr,UINT ra)
{
	tree=NULL;
	if(nl<=10)
	{
		name=s;
		name_length=nl;
	}
	else
	{
		name=s.Left(10);
		name_length=(10+1);
	}

	rf_relationship=rr;
	rf_Attribute=ra;
	
	type=t;
	length=le;
}*/
CAttribute::~CAttribute()
{
    if(tree)
	{
		ASSERT(idx==1);
		delete tree;
	}
}
void CAttribute::SetIndex(UINT IdxFlNo)
{
	this->IndexMainFile=IdxFlNo;
}
WORD CAttribute::GetLength()//得到字段信息的长度
{
	return (6*sizeof(BYTE)+2*sizeof(WORD)+3*sizeof(UINT)+name_length);
}

CAttribute & CAttribute::operator =(const CAttribute &A)
{
    idx=A.idx;
	IndexMainFile=A.IndexMainFile;
	length=A.length;
	name=A.name;
	name_length=A.name_length;
	offset=A.offset;
	rf_Attribute=A.rf_Attribute;
	rf_relationship=A.rf_relationship;
	type=A.type;
	unq=A.unq;
	ispk=A.ispk;
	can_null=A.can_null;
	
	if(A.tree)
	{
		delete(tree);
		tree=new CBplusTree;
	    *tree=*(A.tree);
	}
	else
		tree=NULL;
	return *this;
}