怎么用vc调用SQL Server写的存储过程啊! 谁有关于用vc调用SQL Server写的存储过程的详细质料以及用vc通过ado操作SQL Server的详细质料,给我一份吧,万分感激!!! 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 HRESULT hr; ///设定一个句柄 _ConnectionPtr pConnection; ///一个连接指针 CString strSQLConnect = ((CManagerSys1App*)AfxGetApp())->m_strConnectMaster; try { hr = pConnection.CreateInstance("ADODB.Connection");///创建Connection对象 if(SUCCEEDED(hr)) { hr = pConnection->Open((_bstr_t)strSQLConnect,"","",adModeUnknown); ///连接数据 _variant_t RecordsAffected; CString strDBName = ((CManagerSys1App*)AfxGetApp())->m_strDBName; CString strKill; strKill.Format("exec p_killspid '%s'",strDBName); //kill all connected link pConnection->Execute((_bstr_t)strKill,&RecordsAffected,adCmdText); CString strBackup; strBackup.Format("restore database %s from disk='",strDBName); //restore strBackup += "C:\\temp.bak"; strBackup += "' with replace"; pConnection->Execute((_bstr_t)strBackup,&RecordsAffected,adCmdText); } } catch(_com_error e)///捕捉异常 { CString errormessage; errormessage.Format("全系统数据恢复失败!\r\n错误信息:%s",e.ErrorMessage()); AfxMessageBox(errormessage);///显示错误信息 ///关闭数据库连接 if((pConnection != NULL)) { if(pConnection->State) pConnection->Close(); pConnection = NULL; } return; } 这是一段恢复数据库的代码。p_killspid是断开所有连接到要恢复的数据的连接的存储过程。ADO的详细使用自己找吧。注意:发布的时候,要包含微软的MDAC SQL Server, stored procedure , Command , Recordset, input parameter, output parameter, returned recordset from stored procedure//execute stored procedure , get returned value, output value, and returned recordset.#include "stdafx.h"#import "C:\PROGRA~1\COMMON~1\System\ado\msado15.dll" rename( "EOF", "adoEOF" ) struct InitOle { InitOle() { ::CoInitialize(NULL); } ~InitOle() { ::CoUninitialize(); } } _init_InitOle_;void PrintProviderError(ADODB::_ConnectionPtr pConnection);int main(int argc, char* argv[]){ printf("Create a adParamReturnValue for Command object to get return value of stored procedure\n"); printf("Reference :MSDN---Append and CreateParameter Methods Example (VC++)\n"); ADODB::_ConnectionPtr Conn1; ADODB::_CommandPtr Cmd1; ADODB::_RecordsetPtr Rs1; ADODB::_ParameterPtr retParam= NULL; ADODB::_ParameterPtr inParam=NULL; ADODB::_ParameterPtr outParam=NULL; _variant_t vtEmpty (DISP_E_PARAMNOTFOUND, VT_ERROR); _variant_t vtEmpty2 (DISP_E_PARAMNOTFOUND, VT_ERROR); _bstr_t bstrConnect( L"driver={sql server};server=Cell;Database=zhg;UID=sa;PWD=;" ); // the following stored procedure return 12345 int value _bstr_t bstrCreate ( L"create proc sp_AdoTest( @OutParam int OUTPUT,@InParam int ) " L"as " L"select @OutParam = @InParam + 10 " L"select * from Table1" L"return 12345" ); _bstr_t bstrSP(L"sp_Adotest" ); try { _bstr_t bstrEmpty; Conn1.CreateInstance( __uuidof( ADODB::Connection ) ); Cmd1.CreateInstance( __uuidof( ADODB::Command ) ); Rs1.CreateInstance(__uuidof(ADODB::Recordset)); // Establish connection. Conn1->ConnectionString = bstrConnect; Conn1->Open( bstrConnect, bstrEmpty, bstrEmpty, -1 ); // Open recordset. Cmd1->ActiveConnection = Conn1; Cmd1->CommandText = bstrSP; Cmd1->CommandType = ADODB::adCmdStoredProc; retParam=Cmd1->CreateParameter(_bstr_t("Return"),ADODB::adInteger,ADODB::adParamReturnValue,sizeof(int)); Cmd1->Parameters->Append(retParam); outParam = Cmd1->CreateParameter(_bstr_t("OutParam"),ADODB::adInteger,ADODB::adParamOutput,sizeof(int)); Cmd1->Parameters->Append(outParam); inParam = Cmd1->CreateParameter(_bstr_t("InParam"),ADODB::adInteger,ADODB::adParamInput,sizeof(int),_variant_t( (long) 10 )); inParam->Value=_variant_t( (long) 10 ); Cmd1->Parameters->Append(inParam); Cmd1->Parameters->Refresh(); Cmd1->Parameters->Item[ _variant_t( _bstr_t("@InParam") ) ]->Value =_variant_t( (long) 11 ); Rs1->put_CursorLocation(ADODB::adUseClient); Rs1->Open((_variant_t((IDispatch *) Cmd1)),vtEmpty,ADODB::adOpenStatic, ADODB::adLockReadOnly, -1); // Get return value of the stored procedure.adCmdUnknown TCHAR tcbuf[1024]; long retvalue=Cmd1->Parameters->Item[(short)0]->Value; long p2=Cmd1->Parameters->Item[(short)1]->Value; long p3=Cmd1->Parameters->Item[(short)2]->Value; int recordcount=0; if(Rs1->State==ADODB::adStateClosed) MessageBox(NULL,"no recordset is returned from the stored procedure","Information",MB_OK); else recordcount = Rs1->GetRecordCount(); wsprintf(tcbuf,"retvalue of the stored procedure:%d,input value:%d,output value:%d,record count :%d",retvalue,p2,p3,recordcount); MessageBox(NULL,tcbuf,"Output",MB_OK); } catch(_com_error &e) { _bstr_t bstrSource(e.Source()); _bstr_t bstrDescription(e.Description()); printf("\nCOM error occurred, Source : %s \n Description : %s \n",(LPCSTR)bstrSource,(LPCSTR)bstrDescription); PrintProviderError(Conn1); } return 0;}VOID PrintProviderError(ADODB::_ConnectionPtr pConnection){ // Print Provider Errors from Connection object. // pErr is a record object in the Connection's Error collection. ADODB::ErrorPtr pErr = NULL; long nCount = 0; long i = 0; if( (pConnection->Errors->Count) > 0) { nCount = pConnection->Errors->Count; // Collection ranges from 0 to nCount -1. for(i = 0; i < nCount; i++) { pErr = pConnection->Errors->GetItem(i); printf("\n\t Error number: %x\t%s", pErr->Number, (LPCSTR)pErr->Description); } }} 使用ADO调用存储过程 在ADO中调用存储过程一直是一个困扰大家的问题。其实,关于ADO调用存储过程的方法在很多书中都有讲到,标准的做法无非是按照以下步骤进行: 1、生成并初始化一个_CommandPtr对象; 2、生成调用存储过程需要的参数,这些参数都是_ParameterPtr对象; 3、按照顺序将使用_CommandPtr的Append方法为存储过程提供参数(包括输入参数和输出参数); 4、为_CommandPtr对象指定需要使用的ADO连接; 5、使用_CommandPtr的Execute方法调用存储过程; 6、从结果中获取返回参数的值(如果有的话)。 具体的过程在此我不详细描述,我想看看本文附带的代码就应该很明白了。 在这里我想就我使用ADO调用存储过程时的一些体会说明一下。 1、关于CreateParameter函数 该函数的原型为:CreateParameter (Name, Type, Direction, Size, Value) 其中Name是参数的名称,可以指定也可以不指定; Type是一个DataTypeEnum值,指定参数的类别,取值有adInteger(整型)、adChar(字符/字符串型)等; Direction是一个ParameterDirectionEnum值,其取值为adParamInput、adParamInputOutput、 adParamOutput、adParamReturnValue、adParamUnknown; Size是一个Long类型的值,指示该参数值以字节计算的最大长度,例如对int型,该值可以取为sizeof(int), 对Long型,该值可以取为sizeof(long),对字符串型,可以使用该字符串的长度; Value是一个variant类型的值,是该参数的取值。 在这里需要注意的是,Type参数、Direction参数以及Size参数一定要和存储过程定义时的参数相吻合, 例如,如果有下面一个存储过程 CREATE PROCEDURE SMS_Proc_Handle_All (@UserID Integer, @SourAddr Varchar(15), @DestAddr varchar(5000), @AvValue Single output, @ReturnInfo varchar(100) output ) 则Type参数的取值依次为adInteger、adChar、adChar、adSingle,adChar; Direction参数的取值依次为adParameterIn、adParameterIn、adParameterIn、adParameterOut、adParameterOut; 对于输入参数,Size的值可以根据实际数值来定,对于输出参数,最好是根据定义确定(上例中ReturnInfo参数的 Size值可以取为100)。 2,关于获取Output的参数 获取ourput参数是大家最关注的问题,同时也是最“难”的问题,因为按照书本上的写法,经常获得不了 Output参数,其实这个问题很容易解决:在调用_CommandPtr的Execute方法时,写成 cmmd->Execute(NULL, NULL, adCmdStoredProc); 而不要写成 RecordsetPtr rec = cmmd->Execute(NULL, NULL, adCmdStoredProc); 也就是说,不取返回值(我不知道这是为什么,但是相信我,事情就是这样)。 这句执行完后,使用 cmmd->Parameters->GetItem("XXXXXX")->GetValue(); ^^^^^^^ 输出参数的名称 就可以获得输出参数的值了。 以下是一个通过ADO调用存储过程的部分代码: _CommandPtr cmmd; HRESULT hr = cmmd.CreateInstance(__uuidof(Command)); if(FAILED(hr)) { AfxMessageBox("NewNetDatabase()中创建_CommandPtr对象失败"); return 0; } _ParameterPtr param; param = cmmd->CreateParameter(""/*NetType*/,adTinyInt, adParamInput,sizeof(BYTE),(BYTE)(m_nNetType+1)); cmmd->Parameters->Append(param); param = cmmd->CreateParameter(""/*Name*/,adVarChar, adParamInput,m_strName.GetLength()+1, _variant_t(m_strName)); cmmd->Parameters->Append(param); param = cmmd->CreateParameter(""/*Desp*/,adVarChar, adParamInput,m_strDesp.GetLength()+1, _variant_t(m_strDesp)); cmmd->Parameters->Append(param); param = cmmd->CreateParameter("NewNetID"/*NetID*/,adInteger, adParamOutput,sizeof(long), (long)m_nNewNetID);//返回参数,返回新建的网络的ID cmmd->Parameters->Append(param); cmmd->CommandText=_bstr_t("GSDT_NewNet");//存储过程的名称 cmmd->ActiveConnection = m_pConPtr;//需要使用的ADO连接 cmmd->CommandType=adCmdStoredProc; //注意下面的一行代码,如果你写成这样,就获得不了返回参数的值 //_RecordsetPtr rec = cmmd->Execute(NULL, NULL, adCmdStoredProc); //我不知道这是为什么,但事实就是这样:) cmmd->Execute(NULL, NULL, adCmdStoredProc); m_nNewNetID=(long)cmmd->Parameters->GetItem("NewNetID")->GetValue();//通过参数返回值 cmmd.Detach(); / SQL Server, stored procedure , Command , Recordset, input parameter, output parameter, returned recordset from stored procedure//execute stored procedure , get returned value, output value, and returned recordset.#include "stdafx.h"#import "C:\PROGRA~1\COMMON~1\System\ado\msado15.dll" rename( "EOF", "adoEOF" ) struct InitOle { InitOle() { ::CoInitialize(NULL); } ~InitOle() { ::CoUninitialize(); } } _init_InitOle_;void PrintProviderError(ADODB::_ConnectionPtr pConnection);int main(int argc, char* argv[]){ printf("Create a adParamReturnValue for Command object to get return value of stored procedure\n"); printf("Reference :MSDN---Append and CreateParameter Methods Example (VC++)\n"); ADODB::_ConnectionPtr Conn1; ADODB::_CommandPtr Cmd1; ADODB::_RecordsetPtr Rs1; ADODB::_ParameterPtr retParam= NULL; ADODB::_ParameterPtr inParam=NULL; ADODB::_ParameterPtr outParam=NULL; _variant_t vtEmpty (DISP_E_PARAMNOTFOUND, VT_ERROR); _variant_t vtEmpty2 (DISP_E_PARAMNOTFOUND, VT_ERROR); _bstr_t bstrConnect( L"driver={sql server};server=Cell;Database=zhg;UID=sa;PWD=;" ); // the following stored procedure return 12345 int value _bstr_t bstrCreate ( L"create proc sp_AdoTest( @OutParam int OUTPUT,@InParam int ) " L"as " L"select @OutParam = @InParam + 10 " L"select * from Table1" L"return 12345" ); _bstr_t bstrSP(L"sp_Adotest" ); try { _bstr_t bstrEmpty; Conn1.CreateInstance( __uuidof( ADODB::Connection ) ); Cmd1.CreateInstance( __uuidof( ADODB::Command ) ); Rs1.CreateInstance(__uuidof(ADODB::Recordset)); // Establish connection. Conn1->ConnectionString = bstrConnect; Conn1->Open( bstrConnect, bstrEmpty, bstrEmpty, -1 ); // Open recordset. Cmd1->ActiveConnection = Conn1; Cmd1->CommandText = bstrSP; Cmd1->CommandType = ADODB::adCmdStoredProc; retParam=Cmd1->CreateParameter(_bstr_t("Return"),ADODB::adInteger,ADODB::adParamReturnValue,sizeof(int)); Cmd1->Parameters->Append(retParam); outParam = Cmd1->CreateParameter(_bstr_t("OutParam"),ADODB::adInteger,ADODB::adParamOutput,sizeof(int)); Cmd1->Parameters->Append(outParam); inParam = Cmd1->CreateParameter(_bstr_t("InParam"),ADODB::adInteger,ADODB::adParamInput,sizeof(int),_variant_t( (long) 10 )); inParam->Value=_variant_t( (long) 10 ); Cmd1->Parameters->Append(inParam); Cmd1->Parameters->Refresh(); Cmd1->Parameters->Item[ _variant_t( _bstr_t("@InParam") ) ]->Value =_variant_t( (long) 11 ); Rs1->put_CursorLocation(ADODB::adUseClient); Rs1->Open((_variant_t((IDispatch *) Cmd1)),vtEmpty,ADODB::adOpenStatic, ADODB::adLockReadOnly, -1); // Get return value of the stored procedure.adCmdUnknown TCHAR tcbuf[1024]; long retvalue=Cmd1->Parameters->Item[(short)0]->Value; long p2=Cmd1->Parameters->Item[(short)1]->Value; long p3=Cmd1->Parameters->Item[(short)2]->Value; int recordcount=0; if(Rs1->State==ADODB::adStateClosed) MessageBox(NULL,"no recordset is returned from the stored procedure","Information",MB_OK); else recordcount = Rs1->GetRecordCount(); wsprintf(tcbuf,"retvalue of the stored procedure:%d,input value:%d,output value:%d,record count :%d",retvalue,p2,p3,recordcount); MessageBox(NULL,tcbuf,"Output",MB_OK); } catch(_com_error &e) { _bstr_t bstrSource(e.Source()); _bstr_t bstrDescription(e.Description()); printf("\nCOM error occurred, Source : %s \n Description : %s \n",(LPCSTR)bstrSource,(LPCSTR)bstrDescription); PrintProviderError(Conn1); } return 0;}VOID PrintProviderError(ADODB::_ConnectionPtr pConnection){ // Print Provider Errors from Connection object. // pErr is a record object in the Connection's Error collection. ADODB::ErrorPtr pErr = NULL; long nCount = 0; long i = 0; if( (pConnection->Errors->Count) > 0) { nCount = pConnection->Errors->Count; // Collection ranges from 0 to nCount -1. for(i = 0; i < nCount; i++) { pErr = pConnection->Errors->GetItem(i); printf("\n\t Error number: %x\t%s", pErr->Number, (LPCSTR)pErr->Description); } }} SQL Server安装盘附带的代码有例子,自己找找看 www.fruitfruit.com/vc/atl/ado.cppwww.fruitfruit.com/vc/database/oracle.cpp 有关CRecordSet的问题 常量定义求解 求助:如何在cmainform中获得ctreeview的窗口指针 感觉被欺骗了感情,辞职了,离开所谓的国内最大的软件防火墙开发部。 更改MFC图标的颜色问题,大于256色时颜色失真 奇怪的问题,API函数居然说我没申明 请问和时间相关的类除了CTime 外,还有什么类呢? create ListCtrl-head 添加新表头后无法显示 谁知道PDF文件格式的详细解释 每次用sscanf_s都有不同的问题,心态有点崩 在VC中如何实现'挂起'功能?类似C中的getch()函数. [请问]如何根据图片来自定义窗口形状?
_ConnectionPtr pConnection; ///一个连接指针
CString strSQLConnect = ((CManagerSys1App*)AfxGetApp())->m_strConnectMaster;
try
{
hr = pConnection.CreateInstance("ADODB.Connection");///创建Connection对象
if(SUCCEEDED(hr))
{
hr = pConnection->Open((_bstr_t)strSQLConnect,"","",adModeUnknown); ///连接数据
_variant_t RecordsAffected;
CString strDBName = ((CManagerSys1App*)AfxGetApp())->m_strDBName;
CString strKill;
strKill.Format("exec p_killspid '%s'",strDBName); //kill all connected link
pConnection->Execute((_bstr_t)strKill,&RecordsAffected,adCmdText);
CString strBackup;
strBackup.Format("restore database %s from disk='",strDBName); //restore
strBackup += "C:\\temp.bak";
strBackup += "' with replace";
pConnection->Execute((_bstr_t)strBackup,&RecordsAffected,adCmdText); }
}
catch(_com_error e)///捕捉异常
{
CString errormessage;
errormessage.Format("全系统数据恢复失败!\r\n错误信息:%s",e.ErrorMessage());
AfxMessageBox(errormessage);///显示错误信息
///关闭数据库连接
if((pConnection != NULL))
{
if(pConnection->State)
pConnection->Close();
pConnection = NULL;
} return;
}
p_killspid是断开所有连接到要恢复的数据的连接的存储过程。ADO的详细使用自己找吧。注意:发布的时候,要包含微软的MDAC
//execute stored procedure , get returned value, output value, and returned recordset.
#include "stdafx.h"
#import "C:\PROGRA~1\COMMON~1\System\ado\msado15.dll" rename( "EOF", "adoEOF" )
struct InitOle
{
InitOle() { ::CoInitialize(NULL); }
~InitOle() { ::CoUninitialize(); }
} _init_InitOle_;
void PrintProviderError(ADODB::_ConnectionPtr pConnection);int main(int argc, char* argv[])
{
printf("Create a adParamReturnValue for Command object to get return value of stored procedure\n");
printf("Reference :MSDN---Append and CreateParameter Methods Example (VC++)\n");
ADODB::_ConnectionPtr Conn1;
ADODB::_CommandPtr Cmd1;
ADODB::_RecordsetPtr Rs1;
ADODB::_ParameterPtr retParam= NULL;
ADODB::_ParameterPtr inParam=NULL;
ADODB::_ParameterPtr outParam=NULL;
_variant_t vtEmpty (DISP_E_PARAMNOTFOUND, VT_ERROR);
_variant_t vtEmpty2 (DISP_E_PARAMNOTFOUND, VT_ERROR);
_bstr_t bstrConnect( L"driver={sql server};server=Cell;Database=zhg;UID=sa;PWD=;" );
// the following stored procedure return 12345 int value
_bstr_t bstrCreate ( L"create proc sp_AdoTest( @OutParam int OUTPUT,@InParam int ) "
L"as "
L"select @OutParam = @InParam + 10 "
L"select * from Table1"
L"return 12345" );
_bstr_t bstrSP(L"sp_Adotest" );
try
{
_bstr_t bstrEmpty;
Conn1.CreateInstance( __uuidof( ADODB::Connection ) );
Cmd1.CreateInstance( __uuidof( ADODB::Command ) );
Rs1.CreateInstance(__uuidof(ADODB::Recordset));
// Establish connection.
Conn1->ConnectionString = bstrConnect;
Conn1->Open( bstrConnect, bstrEmpty, bstrEmpty, -1 );
// Open recordset.
Cmd1->ActiveConnection = Conn1;
Cmd1->CommandText = bstrSP;
Cmd1->CommandType = ADODB::adCmdStoredProc;
retParam=Cmd1->CreateParameter(_bstr_t("Return"),ADODB::adInteger,ADODB::adParamReturnValue,sizeof(int));
Cmd1->Parameters->Append(retParam);
outParam = Cmd1->CreateParameter(_bstr_t("OutParam"),ADODB::adInteger,ADODB::adParamOutput,sizeof(int));
Cmd1->Parameters->Append(outParam);
inParam = Cmd1->CreateParameter(_bstr_t("InParam"),ADODB::adInteger,ADODB::adParamInput,sizeof(int),_variant_t( (long) 10 ));
inParam->Value=_variant_t( (long) 10 );
Cmd1->Parameters->Append(inParam);
Cmd1->Parameters->Refresh();
Cmd1->Parameters->Item[ _variant_t( _bstr_t("@InParam") ) ]->Value =_variant_t( (long) 11 );
Rs1->put_CursorLocation(ADODB::adUseClient);
Rs1->Open((_variant_t((IDispatch *) Cmd1)),vtEmpty,ADODB::adOpenStatic,
ADODB::adLockReadOnly, -1);
// Get return value of the stored procedure.adCmdUnknown
TCHAR tcbuf[1024];
long retvalue=Cmd1->Parameters->Item[(short)0]->Value;
long p2=Cmd1->Parameters->Item[(short)1]->Value;
long p3=Cmd1->Parameters->Item[(short)2]->Value;
int recordcount=0;
if(Rs1->State==ADODB::adStateClosed)
MessageBox(NULL,"no recordset is returned from the stored procedure","Information",MB_OK);
else
recordcount = Rs1->GetRecordCount();
wsprintf(tcbuf,"retvalue of the stored procedure:%d,input value:%d,output value:%d,record count :%d",retvalue,p2,p3,recordcount);
MessageBox(NULL,tcbuf,"Output",MB_OK);
}
catch(_com_error &e)
{
_bstr_t bstrSource(e.Source());
_bstr_t bstrDescription(e.Description());
printf("\nCOM error occurred, Source : %s \n Description : %s \n",(LPCSTR)bstrSource,(LPCSTR)bstrDescription);
PrintProviderError(Conn1);
}
return 0;
}
VOID PrintProviderError(ADODB::_ConnectionPtr pConnection)
{
// Print Provider Errors from Connection object.
// pErr is a record object in the Connection's Error collection.
ADODB::ErrorPtr pErr = NULL;
long nCount = 0;
long i = 0; if( (pConnection->Errors->Count) > 0)
{
nCount = pConnection->Errors->Count;
// Collection ranges from 0 to nCount -1.
for(i = 0; i < nCount; i++)
{
pErr = pConnection->Errors->GetItem(i);
printf("\n\t Error number: %x\t%s", pErr->Number, (LPCSTR)pErr->Description);
}
}
}
在ADO中调用存储过程一直是一个困扰大家的问题。其实,关于ADO调用存储过程的方法在很多书中都有讲到,标准的做法无非是按照以下步骤进行:
1、生成并初始化一个_CommandPtr对象;
2、生成调用存储过程需要的参数,这些参数都是_ParameterPtr对象;
3、按照顺序将使用_CommandPtr的Append方法为存储过程提供参数(包括输入参数和输出参数);
4、为_CommandPtr对象指定需要使用的ADO连接;
5、使用_CommandPtr的Execute方法调用存储过程;
6、从结果中获取返回参数的值(如果有的话)。
具体的过程在此我不详细描述,我想看看本文附带的代码就应该很明白了。
在这里我想就我使用ADO调用存储过程时的一些体会说明一下。
1、关于CreateParameter函数
该函数的原型为:CreateParameter (Name, Type, Direction, Size, Value)
其中Name是参数的名称,可以指定也可以不指定; Type是一个DataTypeEnum值,指定参数的类别,取值有adInteger(整型)、adChar(字符/字符
串型)等; Direction是一个ParameterDirectionEnum值,其取值为adParamInput、adParamInputOutput、 adParamOutput、adParamReturnValue、
adParamUnknown; Size是一个Long类型的值,指示该参数值以字节计算的最大长度,例如对int型,该值可以取为sizeof(int), 对Long型,该值可
以取为sizeof(long),对字符串型,可以使用该字符串的长度; Value是一个variant类型的值,是该参数的取值。
在这里需要注意的是,Type参数、Direction参数以及Size参数一定要和存储过程定义时的参数相吻合,
例如,如果有下面一个存储过程 CREATE PROCEDURE SMS_Proc_Handle_All (@UserID Integer, @SourAddr Varchar(15), @DestAddr
varchar(5000), @AvValue Single output, @ReturnInfo varchar(100) output ) 则Type参数的取值依次为adInteger、adChar、adChar、
adSingle,adChar; Direction参数的取值依次为adParameterIn、adParameterIn、adParameterIn、adParameterOut、adParameterOut; 对于输入
参数,Size的值可以根据实际数值来定,对于输出参数,最好是根据定义确定(上例中ReturnInfo参数的 Size值可以取为100)。
2,关于获取Output的参数
获取ourput参数是大家最关注的问题,同时也是最“难”的问题,因为按照书本上的写法,经常获得不了 Output参数,其实这个问题很容易解决
:在调用_CommandPtr的Execute方法时,写成 cmmd->Execute(NULL, NULL, adCmdStoredProc); 而不要写成 RecordsetPtr rec = cmmd->Execute
(NULL, NULL, adCmdStoredProc); 也就是说,不取返回值(我不知道这是为什么,但是相信我,事情就是这样)。 这句执行完后,使用 cmmd-
>Parameters->GetItem("XXXXXX")->GetValue(); ^^^^^^^ 输出参数的名称 就可以获得输出参数
的值了。
以下是一个通过ADO调用存储过程的部分代码:
_CommandPtr cmmd;
HRESULT hr = cmmd.CreateInstance(__uuidof(Command));
if(FAILED(hr))
{
AfxMessageBox("NewNetDatabase()中创建_CommandPtr对象失败");
return 0;
}
_ParameterPtr param;
param = cmmd->CreateParameter(""/*NetType*/,adTinyInt, adParamInput,sizeof(BYTE),(BYTE)(m_nNetType+1));
cmmd->Parameters->Append(param);
param = cmmd->CreateParameter(""/*Name*/,adVarChar, adParamInput,m_strName.GetLength()+1, _variant_t(m_strName));
cmmd->Parameters->Append(param);
param = cmmd->CreateParameter(""/*Desp*/,adVarChar, adParamInput,m_strDesp.GetLength()+1, _variant_t(m_strDesp));
cmmd->Parameters->Append(param);
param = cmmd->CreateParameter("NewNetID"/*NetID*/,adInteger, adParamOutput,sizeof(long), (long)m_nNewNetID);//返回参数,返回新建的网
络的ID cmmd->Parameters->Append(param);
cmmd->CommandText=_bstr_t("GSDT_NewNet");//存储过程的名称
cmmd->ActiveConnection = m_pConPtr;//需要使用的ADO连接
cmmd->CommandType=adCmdStoredProc; //注意下面的一行代码,如果你写成这样,就获得不了返回参数的值 //_RecordsetPtr rec = cmmd-
>Execute(NULL, NULL, adCmdStoredProc); //我不知道这是为什么,但事实就是这样:)
cmmd->Execute(NULL, NULL, adCmdStoredProc); m_nNewNetID=(long)cmmd->Parameters->GetItem("NewNetID")->GetValue();//通过参数返回值
cmmd.Detach();
//execute stored procedure , get returned value, output value, and returned recordset.
#include "stdafx.h"
#import "C:\PROGRA~1\COMMON~1\System\ado\msado15.dll" rename( "EOF", "adoEOF" )
struct InitOle
{
InitOle() { ::CoInitialize(NULL); }
~InitOle() { ::CoUninitialize(); }
} _init_InitOle_;
void PrintProviderError(ADODB::_ConnectionPtr pConnection);int main(int argc, char* argv[])
{
printf("Create a adParamReturnValue for Command object to get return value of stored procedure\n");
printf("Reference :MSDN---Append and CreateParameter Methods Example (VC++)\n");
ADODB::_ConnectionPtr Conn1;
ADODB::_CommandPtr Cmd1;
ADODB::_RecordsetPtr Rs1;
ADODB::_ParameterPtr retParam= NULL;
ADODB::_ParameterPtr inParam=NULL;
ADODB::_ParameterPtr outParam=NULL;
_variant_t vtEmpty (DISP_E_PARAMNOTFOUND, VT_ERROR);
_variant_t vtEmpty2 (DISP_E_PARAMNOTFOUND, VT_ERROR);
_bstr_t bstrConnect( L"driver={sql server};server=Cell;Database=zhg;UID=sa;PWD=;" );
// the following stored procedure return 12345 int value
_bstr_t bstrCreate ( L"create proc sp_AdoTest( @OutParam int OUTPUT,@InParam int ) "
L"as "
L"select @OutParam = @InParam + 10 "
L"select * from Table1"
L"return 12345" );
_bstr_t bstrSP(L"sp_Adotest" );
try
{
_bstr_t bstrEmpty;
Conn1.CreateInstance( __uuidof( ADODB::Connection ) );
Cmd1.CreateInstance( __uuidof( ADODB::Command ) );
Rs1.CreateInstance(__uuidof(ADODB::Recordset));
// Establish connection.
Conn1->ConnectionString = bstrConnect;
Conn1->Open( bstrConnect, bstrEmpty, bstrEmpty, -1 );
// Open recordset.
Cmd1->ActiveConnection = Conn1;
Cmd1->CommandText = bstrSP;
Cmd1->CommandType = ADODB::adCmdStoredProc;
retParam=Cmd1->CreateParameter(_bstr_t("Return"),ADODB::adInteger,ADODB::adParamReturnValue,sizeof(int));
Cmd1->Parameters->Append(retParam);
outParam = Cmd1->CreateParameter(_bstr_t("OutParam"),ADODB::adInteger,ADODB::adParamOutput,sizeof(int));
Cmd1->Parameters->Append(outParam);
inParam = Cmd1->CreateParameter(_bstr_t("InParam"),ADODB::adInteger,ADODB::adParamInput,sizeof(int),_variant_t( (long) 10 ));
inParam->Value=_variant_t( (long) 10 );
Cmd1->Parameters->Append(inParam);
Cmd1->Parameters->Refresh();
Cmd1->Parameters->Item[ _variant_t( _bstr_t("@InParam") ) ]->Value =_variant_t( (long) 11 );
Rs1->put_CursorLocation(ADODB::adUseClient);
Rs1->Open((_variant_t((IDispatch *) Cmd1)),vtEmpty,ADODB::adOpenStatic,
ADODB::adLockReadOnly, -1);
// Get return value of the stored procedure.adCmdUnknown
TCHAR tcbuf[1024];
long retvalue=Cmd1->Parameters->Item[(short)0]->Value;
long p2=Cmd1->Parameters->Item[(short)1]->Value;
long p3=Cmd1->Parameters->Item[(short)2]->Value;
int recordcount=0;
if(Rs1->State==ADODB::adStateClosed)
MessageBox(NULL,"no recordset is returned from the stored procedure","Information",MB_OK);
else
recordcount = Rs1->GetRecordCount();
wsprintf(tcbuf,"retvalue of the stored procedure:%d,input value:%d,output value:%d,record count :%d",retvalue,p2,p3,recordcount);
MessageBox(NULL,tcbuf,"Output",MB_OK);
}
catch(_com_error &e)
{
_bstr_t bstrSource(e.Source());
_bstr_t bstrDescription(e.Description());
printf("\nCOM error occurred, Source : %s \n Description : %s \n",(LPCSTR)bstrSource,(LPCSTR)bstrDescription);
PrintProviderError(Conn1);
}
return 0;
}
VOID PrintProviderError(ADODB::_ConnectionPtr pConnection)
{
// Print Provider Errors from Connection object.
// pErr is a record object in the Connection's Error collection.
ADODB::ErrorPtr pErr = NULL;
long nCount = 0;
long i = 0; if( (pConnection->Errors->Count) > 0)
{
nCount = pConnection->Errors->Count;
// Collection ranges from 0 to nCount -1.
for(i = 0; i < nCount; i++)
{
pErr = pConnection->Errors->GetItem(i);
printf("\n\t Error number: %x\t%s", pErr->Number, (LPCSTR)pErr->Description);
}
}
}
www.fruitfruit.com/vc/database/oracle.cpp