MFC+ADO+ACCESS創(chuàng)建數(shù)據(jù)庫

行走在理想邊緣 2019-01-22

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發(fā)布日期：3/16/2007 2:31:19 PM BENKONG

最近偶然要做一個小型的數(shù)據(jù)庫管理系統(tǒng)，為了方便用戶無需自己用access創(chuàng)建數(shù)據(jù)庫，所以，我必須設法讓程序能夠創(chuàng)建數(shù)據(jù)庫，數(shù)據(jù)庫表以及判斷數(shù)據(jù)庫表的存在。下面的程序代碼希望能夠為遇到這方面困難的朋友提供幫助：(2008/11/5重新編輯)

//1.引入ado庫
#import "c:/Program Files/Common Files/System/ADO/Msadox.dll" rename_namespace("ADOCG") rename("EOF", "adoXEOF") rename("DataTypeEnum","adoXDataTypeEnum")
#import "C:/Program Files/Common Files/System/ADO/msado15.dll" named_guids rename("EOF","adoEOF"), rename("BOF","adoBOF")
using namespace ADODB;
using namespace ADOCG;
#define TESTHR(x) if FAILED(x) _com_issue_error(x);
//2.創(chuàng)建ACCESS數(shù)據(jù)庫
BOOL CDeRenDlg::CreateMdb(CString strDBName)
{
CString strMdbConn = "Provider='Microsoft.JET.OLEDB.4.0';Data source = " + strDBName;
try
{
HRESULT hr = S_OK;
_CatalogPtr pCatalog = NULL;
_bstr_t cnnstring(strMdbConn);
TESTHR(hr = pCatalog.CreateInstance(__uuidof (Catalog)));
pCatalog->Create(cnnstring);
}
catch(_com_error e)
{
_bstr_t bstrDescription(e.Description());
CString strErro=CString(_T("創(chuàng)建ACCEESS數(shù)據(jù)庫出錯: "))
+ (LPCSTR)e.Description()
+ CString(_T("Create ACCESS DB error: "))
+ (LPCSTR)e.Description();
AfxMessageBox(strErro);
return FALSE;
}
return TRUE;
}
//3.創(chuàng)建數(shù)據(jù)庫表-材料表
BOOL CDeRenDlg::CreateTable( CString strTabName)
{
HRESULT hr = S_OK;
_CatalogPtr pCatalog = NULL;
_TablePtr pTableNew = NULL;
_IndexPtr pIndexNew = NULL;
_IndexPtr pIndex = NULL;
_ColumnPtr pColumn = NULL;
CString strConn,strDBName;
strDBName=this->GetDBName(m_nDBYear);
CFileFind ff;
if(!ff.FindFile(strDBName))
{
AfxMessageBox("數(shù)據(jù)庫不存在，請先在高級設置對話框中創(chuàng)建數(shù)據(jù)庫！");
return FALSE;
}
strConn="Provider='Microsoft.JET.OLEDB.4.0';Data source = " + strDBName;
_bstr_t strcnn(strConn);
try
{
TESTHR(hr = pCatalog.CreateInstance (__uuidof(Catalog)));
TESTHR(hr = pTableNew.CreateInstance(__uuidof(Table)));
TESTHR(hr = pIndexNew.CreateInstance(__uuidof(Index)));
TESTHR(hr = pIndex.CreateInstance (__uuidof(Index)));
TESTHR(hr = pColumn.CreateInstance (__uuidof(Column)));
// 連接
pCatalog->PutActiveConnection(strcnn);
// 表名
pTableNew->Name = _bstr_t(strTabName);
pTableNew->ParentCatalog = pCatalog;
//
//m_pTableNew->Columns->Append("ContactId", ::adInteger,0);
//m_pTableNew->Columns->GetItem("ContactId")->Properties->GetItem("AutoIncrement")->Value = true;
// 加入字段
CString str;
str = _T("公司名稱");//"公司名稱";
pTableNew->Columns->Append(_variant_t(str), ADOCG::adVarWChar, 50);
pTableNew->Columns->GetItem(_variant_t(str))->Properties->GetItem("Jet OLEDB:Allow Zero Length")->Value =false; //將必填字段設置為否
str = _T("產(chǎn)品名稱");//"產(chǎn)品名稱";
pTableNew->Columns->Append(_variant_t(str), ADOCG::adVarWChar, 50);
pTableNew->Columns->GetItem(_variant_t(str))->Properties->GetItem("Jet OLEDB:Allow Zero Length")->Value =false;
str = _T("產(chǎn)品規(guī)格");//"產(chǎn)品名稱";
pTableNew->Columns->Append(_variant_t(str), ADOCG::adVarWChar, 50);
pTableNew->Columns->GetItem(_variant_t(str))->Properties->GetItem("Jet OLEDB:Allow Zero Length")->Value =false;
//*
// 加入主鍵
pIndexNew->Name = "pryIndex";//"日期";
pIndexNew->Columns->Append(_variant_t(str), ADOCG::adVarWChar, 50);
pIndexNew->PutPrimaryKey(-1);
pIndexNew->PutUnique(-1);
pTableNew->Indexes->Append(_variant_t ((IDispatch*)pIndexNew));
//*/
// 加入表中
pCatalog->Tables->Append(_variant_t ((IDispatch*)pTableNew));
pCatalog->Tables->Refresh();
}
catch(_com_error &e)
{
_bstr_t bstrSource(e.Source());
_bstr_t bstrDescription(e.Description());
AfxMessageBox(e.Description());
return FALSE;
}
return TRUE;
}
//4.判斷一個表在數(shù)據(jù)庫中是否存在
BOOL CDeRenDlg::IsTalbeExit(CString strTable)
{
try
{
if(!m_adoConnection.IsOpen()) return FALSE;
_RecordsetPtr pRstSchema = NULL;
pRstSchema=m_adoConnection.OpenSchema(adSchemaTables);
while(!pRstSchema->adoEOF)
{
_bstr_t table_name = pRstSchema->Fields->GetItem("TABLE_NAME")->Value;
_bstr_t table_type = pRstSchema->Fields->GetItem("TABLE_TYPE")->Value;
if ( strcmp(((LPCSTR)table_type),"TABLE")==0)
{
if(strTable.Compare((LPCSTR)table_name)==0)return true;
}
pRstSchema->MoveNext();
}
if(pRstSchema) pRstSchema->Close(); /*&&(pRstSchema->State==ADODB::adStateOpen)*/
}
catch(_com_error e)//
{
::MessageBox(NULL,e.Description(),"Error",MB_OK);
return FALSE;
}
return false;
}