databaseview.cpp

1.通过鼠标拖拽和弹出对话框完成实体、属性、联系的绘制以及各参数设定 2.对绘制的实体、属性、联系提供合法性检查 3.对绘制的图形进行拖动、重设大小、删除 4.通过属性对话框对实体、属性、联系的

		}
		this->Invalidate(true);	
	}
	if(flag==5)
	{
		CString s1;
		CString s2;
		CString s3;
		CDialog3 a=new CDialog3();
		a.father=pDoc->diagram->firstElement;
		a.DoModal();
		s3=a.m_relationname;
		s1=a.m_entity1name;
		s2=a.m_entity2name;
		if(
			s1==""||s2==""||s3==""||
			(s3.GetAt(0)>='1'&&
		    s3.GetAt(0)<='9')||
		    s3.Find(" ")>=1||
			pDoc->diagram->have(s3)==1||
			pDoc->diagram->father(s1,2)==NULL||
			pDoc->diagram->father(s2,2)==NULL||
			a.m_relationtype==0||s2==s3)
		{
            MessageBox(s1+s2+"error input in the formal dialog",NULL,MB_ICONSTOP);
		}
		else
		{
			Element* e1=pDoc->diagram->father(s1,2);
			MyEntity* m1=(MyEntity*)e1;
			Element* e2=pDoc->diagram->father(s2,2);
			MyEntity* m2=(MyEntity*)e2;
			if(m1->flag==2||m2->flag==2)
			{
                MessageBox(s1+s2+"error input in the formal dialog",NULL,MB_ICONSTOP);
			}
			else
			{
			    Relation* r=new Relation(s3,a.m_relationtype,m1,m2,p1->x,p1->y,p2->x,p2->y);
				if(m1==m2)
				{
					CDialog5 b=new CDialog5();
					b.DoModal();
					r->role1=b.m_role1;
					r->role2=b.m_role2;
				}
		    	pDoc->diagram->addElement(r);
				if(m1!=m2)
				{
		        	m1->addRelation(r);
				}
		    	m2->addRelation(r);
			}

		}
		this->Invalidate(true);	
	}
	if(flag==6)
	{
		CString s1;
		CString s2;
		CString s3;
		CDialog3 a=new CDialog3();
		a.father=pDoc->diagram->firstElement;
		a.DoModal();
		s3=a.m_relationname;
		s1=a.m_entity1name;
		s2=a.m_entity2name;
		if( s1==""||s2==""||s3==""||
			(s3.GetAt(0)>='1'&&
		    s3.GetAt(0)<='9')||
		    s3.Find(" ")>=1||
			pDoc->diagram->have(s3)==1||
			pDoc->diagram->father(s1,2)==NULL||
			pDoc->diagram->father(s2,2)==NULL||
			s2==s1)
		{
            MessageBox("aa error input in the formal dialog",NULL,MB_ICONSTOP);
		}
		else
		{
			Element* e1=pDoc->diagram->father(s1,2);
			MyEntity* m1=(MyEntity*)e1;
			Element* e2=pDoc->diagram->father(s2,2);
			MyEntity* m2=(MyEntity*)e2;
			if(m2->flag==1||m2->firstRelation->data!=NULL)
			{
                MessageBox(s1+s2+"error input in the formal dialog",NULL,MB_ICONSTOP);
			}
			else
			{
			    Relation* r=new Relation(s3,5,m1,m2,p1->x,p1->y,p2->x,p2->y);
		    	pDoc->diagram->addElement(r);
		    	m1->addRelation(r);
		    	m2->addRelation(r);
			}
			
		}
		this->Invalidate(true);	
	}
	if(flag==7||flag==8||flag==9)
	{
		CDialog2 a=new CDialog2();
		a.father=pDoc->diagram->firstElement;
		a.DoModal();
		CString s1=a.m_attributename;
		CString s2=a.m_attributefather;
		CString s3=a.m_datalength;
	    CString s4=a.m_nametype;
		int i1=a.mainkey;
		int i2=a.canempty;
		if(
			s1==""||s2==""||s4==""||
			(s1.GetAt(0)>1&&s1.GetAt(0)<9)||
			pDoc->diagram->have(s1)==1||
			s1.Find(" ")>=1||
            pDoc->diagram->father(s2,1)==NULL||
			s4==""||
			s3.Find(" ")>=1||((i1==0||i2==0)&&(flag==7||flag==8))
		  )
		{
			MessageBox(s1+s2+"error input in the formal dialog",NULL,MB_ICONSTOP);
		}
		else
		{
			if((s4=="char"||s4=="varchar")&&s3=="")
			{
                   MessageBox("error input in the formal dialog",NULL,MB_ICONSTOP);
                   start=0;
	               flag=0;
				   this->Invalidate(true);	
				   return;
			}
			for(int i=0;i<s3.GetLength();i++)
			{
				if(s3.GetAt(i)<'0'||s3.GetAt(i)>'9')
				{
                   MessageBox(s1+s2+"error input in the formal dialog",NULL,MB_ICONSTOP);
                   start=0;
	               flag=0;
				   this->Invalidate(true);	
				   return;
				}
			}
			if(flag==7)
			{
				Attribute* attr=new Attribute(s1,s4,pDoc->diagram->father(s2,1),
					                1,i1,p1->x,p1->y,p2->x,p2->y,i2,atoi(s3));
				pDoc->diagram->addElement(attr);
                pDoc->diagram->father(s2,1)->addAttribute(attr);
			}
			if(flag==8)
			{
				Attribute* attr=new Attribute(s1,s4,pDoc->diagram->father(s2,1),
					                2,i1,p1->x,p1->y,p2->x,p2->y,i2,atoi(s3));
				pDoc->diagram->addElement(attr);
                pDoc->diagram->father(s2,1)->addAttribute(attr);
			}
			if(flag==9)
			{
               	Attribute* attr=new Attribute(s1,s4,pDoc->diagram->father(s2,1),
			    3,i1,p1->x,p1->y,p2->x,p2->y,i2,atoi(s3));
				pDoc->diagram->addElement(attr);
                pDoc->diagram->father(s2,1)->addAttribute(attr);
			}
		}
		this->Invalidate(true);	
	}
	start=0;
	flag=0;
	pDoc->DeleteContents();
}

void CDatabaseView::OnResize() 
{
	// TODO: Add your command handler code here
	flag=2;
}

void CDatabaseView::OnRelation2() 
{
	// TODO: Add your command handler code here
	flag=6;
}

void CDatabaseView::OnRelation1() 
{
	// TODO: Add your command handler code here
	flag=5;
	
}

void CDatabaseView::OnEntity2() 
{
	// TODO: Add your command handler code here
	flag=4;
}

void CDatabaseView::OnEntity1() 
{
	// TODO: Add your command handler code here
	flag=3;	
}

void CDatabaseView::OnDelete() 
{
	// TODO: Add your command handler code here
	CDC *g1=this->GetDC();
	CDatabaseDoc* pDoc = GetDocument();
	if(pDoc->diagram->selected==NULL)
	{
		MessageBox("select an element first",NULL,MB_ICONSTOP);
		return;
	}
	else if(pDoc->diagram->selected->isDeleted()==0)
	{
		MessageBox("delete attribute first",NULL,MB_ICONSTOP);
		return;
	}
	else if(pDoc->diagram->selected->isDeleted()==2)
	{
		MessageBox("delete relation first",NULL,MB_ICONSTOP);
		return;
	}
	else
	{
	    pDoc->diagram->removeElement(pDoc->diagram->selected);
		pDoc->diagram->selected->Delete();
		delete(pDoc->diagram->selected);
		this->Invalidate(true);	
		pDoc->diagram->selected=NULL;
	}
}
void CDatabaseView::OnAttribute1() 
{
	// TODO: Add your command handler code here
	flag=7;
}

void CDatabaseView::OnAttribute2() 
{
	// TODO: Add your command handler code here
	flag=8;
}

void CDatabaseView::OnAttribute3() 
{
	// TODO: Add your command handler code here
	flag=9;
}

void CDatabaseView::OnChange() 
{
	// TODO: Add your command handler code here
	CDatabaseDoc* pDoc = GetDocument();
	Change *a=new Change(pDoc->diagram);
	CDialog4 b=new CDialog4();
	b.m_contains=a->change();
	b.DoModal();	
}

void CDatabaseView::OnRename() 
{
	// TODO: Add your command handler code here
    CDatabaseDoc* pDoc = GetDocument();
	if(pDoc->diagram->selected==NULL)
	{
       	MessageBox("select element first",NULL,MB_ICONSTOP);
		return;
	}
	CDialog1 a=new CDialog1();
	a.DoModal();
	CString s=a.m_entityname1;
	if(s==""||(s.GetAt(0)>='1'&&s.GetAt(0)<='9')||
	s.Find(" ")>=1||pDoc->diagram->have(s)==1)
	{
			MessageBox("error input in the formal dialog",NULL,MB_ICONSTOP);
			return;
	}
	pDoc->diagram->selected->name=s;
	this->Invalidate(true);		
}
void CDatabaseView::OnPop() 
{
	// TODO: Add your command handler code here
	CDatabaseDoc* pDoc = GetDocument();
	if(pDoc->diagram->selected->type==1)
	{
       CDialog1 a=new CDialog1();
	   a.m_entityname1=pDoc->diagram->selected->name;
	   a.DoModal();
	   CString s=a.m_entityname1;
	   if(s==""||
		(s.GetAt(0)>='1'&&
		 s.GetAt(0)<='9')||
		 s.Find(" ")>=1||
		 (pDoc->diagram->have(s)==1&&s!=pDoc->diagram->selected->name))
	   {
             MessageBox("error input in the formal dialog",NULL,MB_ICONSTOP);
			 return;
	   }
	   pDoc->diagram->selected->name=s;
	   this->Invalidate();
	}
	else if(pDoc->diagram->selected->type==2)
	{
        CString s11;
		CString s21;
		CString s31;
		MyEntity* e1;
		MyEntity* e2;
		int flag;
        Relation *r=(Relation*)pDoc->diagram->selected;
		CDialog3 a=new CDialog3();
		a.father=pDoc->diagram->firstElement;
		a.m_relationname=r->name;
		a.m_entity1name=r->entity1->name;
		a.m_entity2name=r->entity2->name;
        a.m_relationtype=r->flag;
		if(r->flag==5)
		{
			a.m_relationtype=2;
		}
		a.DoModal();
		s31=a.m_relationname;
		s11=a.m_entity1name;
		s21=a.m_entity2name;
		flag=a.m_relationtype;
		if(pDoc->diagram->father(s11,2)!=NULL&&pDoc->diagram->father(s21,2)!=NULL)
		{
           	e1=(MyEntity*)pDoc->diagram->father(s11,2);
			e2=(MyEntity*)pDoc->diagram->father(s21,2);
		}
		if(
			s11==""||s21==""||s31==""||
			(s31.GetAt(0)>='1'&&
		    s31.GetAt(0)<='9')||
		    s31.Find(" ")>=1||
			(pDoc->diagram->have(s31)==1&&s31!=pDoc->diagram->selected->name)||
			pDoc->diagram->father(s11,2)==NULL||
			pDoc->diagram->father(s21,2)==NULL||
			a.m_relationtype==0||
			(r->flag<=4&&e2->flag==2)||
			(r->flag==5&&e2->flag==1)
		  )
		{
           MessageBox(s11+s21+"error input in the formal dialog",NULL,MB_ICONSTOP);
		}
		else
		{
			r->name=s31;
			r->entity1=e1;
			r->entity2=e2;
			if(r->flag<=4)
			{
				r->flag=a.m_relationtype;
			}
	       this->Invalidate();
		}
	}
	else if(pDoc->diagram->selected->type==3)
	{
		Attribute* att=(Attribute*)pDoc->diagram->selected;
		CDialog2 a=new CDialog2();
		a.m_attributename=att->name;
		a.m_attributefather=att->father->name;
		a.m_nametype=att->nametype;
		a.canempty=att->canempty;
		a.mainkey=att->mainkey;
		if(a.m_nametype.GetAt(0)=='c')
		{
			a.m_nametype="char";
			a.m_datalength.Format("%d",att->datelength);
		}
		else if(a.m_nametype.GetAt(0)=='v')
		{
            a.m_nametype="varchar";
			a.m_datalength.Format("%d",att->datelength);
		}
        else a.m_datalength="4";
		a.father=pDoc->diagram->firstElement;
		a.DoModal();
		CString s1=a.m_attributename;
		CString s2=a.m_attributefather;
		CString s3=a.m_datalength;
	    CString s4=a.m_nametype;
		int i1=a.mainkey;
		int i2=a.canempty;
		if(
			s1==""||s2==""||s4==""||
			(s1.GetAt(0)>1&&s1.GetAt(0)<9)||
			(pDoc->diagram->have(s1)==1&&s1!=att->name)||
			s1.Find(" ")>=1||
            pDoc->diagram->father(s2,1)==NULL||
			s4==""||
			s3.Find(" ")>=1||((i1==0||i2==0))
		  )
		{
            MessageBox("error input in the formal dialog",NULL,MB_ICONSTOP);
		}
		else
		{
			if((s4=="char"||s4=="varchar")&&s3=="")
			{
                   MessageBox("error input in the formal dialog",NULL,MB_ICONSTOP);
                   start=0;
	               flag=0;
				   this->Invalidate(true);	
				   return;
			}
			att->name=s1;
			att->nametype=s4;
			att->father=pDoc->diagram->father(s2,1);
			att->datelength=atoi(s3);
			att->canempty=i2;
			att->mainkey=i1;
		}
		this->Invalidate();
	}
}