在VC++中做控件与数据表字段绑定

最新推荐文章于 2021-01-28 05:39:09 发布

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最新推荐文章于 2021-01-28 05:39:09 发布

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分类专栏： VC++(MFC)学习笔记文章标签： vc++ exchange reference object mfc 数据库

本文链接：https://blog.youkuaiyun.com/markinstephen/article/details/3062656

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做管理系统难免与数据库打交道……我们都要将控件与数据表中的字读绑定……在VC++ 6.0中，提供了MFC ClassWizard，这很方便的就能实现这一功能……但是在VC++ 2008中，却去掉了ClassWizard这个功能……所以，这里就不那么方便了……

然而了解原理的都知道，这不过就是添加几个代码就搞定了事……

DDX_FieldText函数就是解决之道……

void AFXAPI DDX_FieldText(CDataExchange* pDX, int nIDC, COleCurrency& value, CDaoRecordset* pRecordset);

pDX

A pointer to a CDataExchange object. The framework supplies this object to establish the context of the data exchange, including its direction.

nIDC

The ID of a control in the CRecordView or CDaoRecordView object.

value

A reference to a field data member in the associated CRecordset or CDaoRecordset object. The data type of value depends on which of the overloaded versions of DDX_FieldText you use.

pRecordset

A pointer to the CRecordset or CDaoRecordset object with which data is exchanged. This pointer enables DDX_FieldText to detect and set Null values.

例：

void CMyDaoRecordView::DoDataExchange(CDataExchange* pDX)
{
   CDaoRecordView::DoDataExchange(pDX);
   DDX_FieldCBString(pDX, IDC_LASTNAME, m_pSet->m_LastName, m_pSet);
   DDX_FieldText(pDX, IDC_ID, m_pSet->m_EmployeeID, m_pSet);
   DDX_FieldText(pDX, IDC_AGE, m_pSet->m_Age, m_pSet);
}