C++ 连接Oracle

欢迎技术交流。 QQ：138986722

刚刚学习了C++、感觉学东西还是动手比较学得快一点！

下面是一个ADO方式连接Oracle的小程序部分代码......

首先是Oracle的配置、在Oracle的安装路径下找到：Oracle\network\ADMIN\tnsnames.ora文件、配置一下连接配置

BOSS =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = xx.xx.xx.xx)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = boss)
)
)

新建一个头文件、名为CDBOperation.h：

#pragma once
#import "c:\program files\common files\system\ado\msado15.dll" no_namespace rename("EOF", "adoEOF")
class CDBOperation
{
public:
//初始化数据库操作需要的对象
CDBOperation(void);
~CDBOperation(void);

//连接至数据库
bool ConnToDB(char *ConnectionString, char *UserID, char *Password);

//数据库操作函数
//查询操作 删除以及添加
_RecordsetPtr ExecuteWithResSQL(const char *);

private:
void PrintErrorInfo(_com_error &);

private:
//初始化数据库连接、命令、记录集
_ConnectionPtr CreateConnPtr();
_CommandPtr CreateCommPtr();
_RecordsetPtr CreateRecsetPtr();

private:
//数据库连接需要的连接、命令操作对象
_ConnectionPtr m_pConnection;
_CommandPtr m_pCommand;
};

新建一个c++源文件、名为CDBOperation.cpp：

#include "stdafx.h"
#include "DBOperation.h"
CDBOperation::CDBOperation(void)
{
CoInitialize(NULL);
m_pConnection = CreateConnPtr();
m_pCommand = CreateCommPtr();
}
CDBOperation::~CDBOperation(void)
{
m_pConnection->Close();
}
bool CDBOperation::ConnToDB(char *ConnectionString, char *UserID, char *Password)
{
if (NULL == m_pConnection)
{
printf("Failed to create connection\n");
return false;
}
try
{
HRESULT hr = m_pConnection->Open(ConnectionString, UserID, Password, NULL);
if (TRUE == FAILED(hr))
{
return false;
}
m_pCommand->ActiveConnection = m_pConnection;
return true;
}
catch(_com_error &e)
{
PrintErrorInfo(e);
return false;
}
}
_RecordsetPtr CDBOperation::ExecuteWithResSQL(const char *sql)
{
try
{
m_pCommand->CommandText = _bstr_t(sql);
_RecordsetPtr pRst = m_pCommand->Execute(NULL, NULL, adCmdText);
return pRst;
}
catch(_com_error &e)
{
PrintErrorInfo(e);
return NULL;
}
}
void CDBOperation::PrintErrorInfo(_com_error &e)
{
printf("Error infomation are as follows\n");
printf("ErrorNo: %d\nError Message:%s\nError Source:%s\nError Description:%s\n", e.Error(), e.ErrorMessage(), (LPCTSTR)e.Source(), (LPCTSTR)e.Description());
}

_ConnectionPtr CDBOperation::CreateConnPtr()
{
HRESULT hr;
_ConnectionPtr connPtr;
hr = connPtr.CreateInstance(__uuidof(Connection));
if (FAILED(hr) == TRUE)
{
return NULL;
}
return connPtr;
}

_CommandPtr CDBOperation::CreateCommPtr()
{
HRESULT hr;
_CommandPtr commPtr;
hr = commPtr.CreateInstance(__uuidof(Command));
if (FAILED(hr) == TRUE)
{
return NULL;
}
return commPtr;
}

_RecordsetPtr CDBOperation::CreateRecsetPtr()
{
HRESULT hr;
_RecordsetPtr recsetPtr;
hr = recsetPtr.CreateInstance(__uuidof(Command));
if (FAILED(hr) ==TRUE)
{
return NULL;
}
return recsetPtr;
}

我的代码是放在MFC一个按钮Click事件里面的：

记住在处理事件的cpp文件中导入头文件：#include "DBOperation.h"

CDBOperation dbOper;
bool bConn = dbOper.ConnToDB("Provider=OraOLEDB.Oracle.1;Persist Security Info=True;Data Source=boss", "用户名", "密码");
if (false == bConn)
{
MessageBox((LPCTSTR)"连接数据库出现错误\0",0,0);
return;
}

//查询
_RecordsetPtr pRst;
char sql[255] = {0};
strcpy(sql, " select * from boss_test_table2 where rownum = 1 ");
pRst = dbOper.ExecuteWithResSQL(sql);
if (NULL == pRst)
{
MessageBox(_T("查询数据出现错误！\0"),0,0);
return;
}
if (pRst->adoEOF)
{
pRst->Close();
MessageBox((LPCTSTR)"There is no records in this table\0",0,0);
return;
}
_variant_t vSno, vName;
while (!pRst->adoEOF)
{
//pRst->MoveFirst(); //记录集指针移动到查询结果集的前面
vSno = pRst->GetCollect(_variant_t("U_NUMBER"));
vName = pRst->GetCollect(_variant_t("USERS_NAME"));
MessageBox((LPCTSTR)(_bstr_t)vSno,0,0);
pRst->MoveNext();
}

strcpy(sql, "insert into boss_test_table2 (u_number, users_name, users_phone, status, customno_id) values ('0001', 'C+TTT+', '13999000000', 2, 'BPPPPPPPPPP')");
pRst = dbOper.ExecuteWithResSQL(sql);
if (NULL != pRst)
{
AfxMessageBox(_T("插入数据成功\n"));
}
//执行删除语句
sprintf(sql, "delete boss_test_table2 where u_number = '%s'", "009");
pRst = dbOper.ExecuteWithResSQL(sql);
if (NULL != pRst)
{
MessageBox(_T("删除数据成功\0"),0,0);
}
//执行更新语句
sprintf(sql, "update boss_test_table2 set users_name = '%s' ", "C++反人类、MFC反社会");
pRst = dbOper.ExecuteWithResSQL(sql);
if (NULL != pRst)
{
MessageBox(_T("更新数据成功\0"),0,0);
}

哎呀、又有工单了.......一个JS浏览器的兼容问题、有得搞了......o(︶︿︶)o 唉！！！