原创 SQL2000中ADO属性在VC的实际应用问题

_ConnectionPtr链接集链接即打开数据库

m_SqlConnection.CreateInstance("ADODB.Connection");
// strWay="driver={SQL Server};Server=" + sqlname + ";DATABASE=MyDataBase;UID=" + sqluser + ";PWD=" + sqlpass;
strWay="driver={SQL Server};Server=" + sqlname + ";DATABASE=调度信息库";
m_SqlConnection->ConnectionTimeout = 10;//设置超时时间为10秒
m_SqlConnection->CursorLocation = adUseClient;
m_SqlConnection->Open((_bstr_t)strWay,(_bstr_t)sqluser,(_bstr_t)sqlpass,adModeUnknown);

_RecordsetPtr 记录集打开数据表(中的记录)

m_SqlRecordset.CreateInstance("ADODB.Recordset");
m_SqlRecordset->Open((_variant_t)("SELECT * FROM 城市表 WHERE 省份='"+str+"' AND 城市 IS NOT NULL"),
(IDispatch*)m_SqlConnection,
adOpenStatic,
adLockOptimistic,
adCmdText);


_CommandPtr 命令集打开数据表即执行命令
m_pCommand.CreateInstance("ADODB.Command");
m_pCommand->ActiveConnection = m_SqlConnection;
m_pCommand->CommandType=adCmdText; 

vNULL.vt = VT_ERROR;
vNULL.scode = DISP_E_PARAMNOTFOUND;


sprintf(buf,"DELETE FROM 接收短信 WHERE ID=%d",index);
m_pCommand->CommandText=buf; //命令字串。
m_pCommand->Execute(&vNULL,&vNULL,adCmdText);///执行命令。



_ParameterPtr 参数集主要用于存储过程

_ParameterPtr param;
param=m_pCommand->CreateParameter(_bstr_t("@user"),adVarChar,adParamInput,20);
param->Value=_variant_t(logname);.
m_pCommand->Parameters->Append(param);

_variant_t vNULL;
vNULL.vt = VT_ERROR;
vNULL.scode = DISP_E_PARAMNOTFOUND;
m_pCommand->Execute(&vNULL,&vNULL,adCmdStoredProc);


建议用属性更简单
m_pCommand->Parameters->Refresh();  
m_pCommand->Parameters->Item["@user"]->Value=_variant_t(logname);  
m_pCommand->Parameters->Item["@operation"]->Value=_variant_t(operation);  
m_pCommand->Parameters->Item["@oper_type"]->Value=_variant_t(oper_type);  

再如：

//四种操作字段的写入方法
m_pRecordset->Collect["名称"] = _variant_t(m_strName);
// m_pRecordset->Fields->Item["名称"]->Value = _variant_t(m_strName);
// m_pRecordset->PutCollect("名称", _variant_t(m_strName));
// m_pRecordset->GetFields()->GetItem("名称")->PutValue(_variant_t(m_strName));

//四种操作字段的读取方法
m_cmbCity.AddString((_bstr_t)m_SqlRecordset->Collect["城市"]);
// m_cmbCity.AddString((_bstr_t)m_SqlRecordset->Fields->Item["城市"]->Value);
// m_cmbCity.AddString((_bstr_t)m_SqlRecordset->GetCollect("城市"));
// m_cmbCity.AddString((_bstr_t)m_SqlRecordset->GetFields()->GetItem("城市")->GetValue());

m_SqlRecordset.CreateInstance("ADODB.Recordset");
m_SqlRecordset->CursorLocation = adUseClient;
  m_SqlRecordset->Open(_variant_t(str),
_variant_t((IDispatch*)m_SqlConnection),
adOpenStatic,
adLockOptimistic,
adCmdText);
CString strFind;
strFind.Format("主叫号码 = %s", m_strCheck);
strFind.Format("主叫号码 LIKE \'%%%s%%\'", m_strCheck);
  m_SqlRecordset->Fields->Item["主