Thank you, of course I searched in the WWW
( With google, which also finds this pages )
But the tip for looking in the of manual-pages at
was usefull.
I had to do some changes, but now it works.
Maybe I would help some others trying the same.
( I used unixODBC-devel-2.2.2-73 , included in SuSE 8.1 )
in the odbc.c changed the includes:
from
#include
#include
#include
to
#include
#include
#include
and the connect:
V_OD_erg = SQLConnect(V_OD_hdbc, (SQLCHAR*) "SAPDB_INTERNAL", SQL_NTS,
(SQLCHAR*) "MYUSER", SQL_NTS,
(SQLCHAR*) "MYPWD", SQL_NTS);
Comiling and linking:
gcc odbc.c -o odbc.o -lodbc
ld -o odbc odbc.o -L/usr/lib
in /etc/unixODBC.ini I have
[SAPDB_INTERNAL]
Description = SapDB Internal-Mode
Driver = /opt/sapdb/interfaces/odbc/lib/libsqlod.so
ServerType = odbc
ServerNode = myServer
ServerDB = MYSAPDB
SQLMode = INTERNAL
IsolationLevel = Committed
TraceFileName = /var/log/sapdb/ODBCmySAPdbInternal.log
-------- Original-Nachricht --------
Betreff: Re: Example for C using ODBC for Linux ?
Datum: Tue, 22 Jul 2003 13:53:32 -0500
Von: Derek Colley
An: linux.general at listserv.sap.com Referenzen: <3F1D267C.8000200 at webde-ag.de>
Have you tried searching for resources on Yahoo? brings up a
list of
related sites.
Most relevant is the http:// website. Check the Manuals
section
for a programmer's guide.
--
Derek
Quoting mkl at webde-ag.de:
> I`m searching for an C / C++ source > to connect to sapdb via ODBC > on Linux. > > _______________________________________________ > linux.general mailing list > linux.general at listserv.sap.com > > ------------------------------------------------------------
webMail supplied & supported by _______________________________________________
linux.general mailing list linux.general at listserv.sap.com
...
SQLHSTMT hstmt=SQL_NULL_HSTMT; //定义语句句柄 SQLHSTMT(sql handle statement) SQLHENV henv; //定义环境句柄 SQLHENV(sql handle environment) SQLHDBC hdbc;//定义连接句柄 SQLHDBC(sql handle database Connection) SQLRETURN retcode;
SQLSMALLINT ConnStrOutLen;
SQLAllocHandle(SQL_HANDLE_ENV,SQL_NULL_HANDLE,&henv); //分配odbc环境句柄 ...
在vc++ 6.0里，用c++通过ODBC
API,使用函数SQLConnect连接数据库。
#include
#include
#include "sqlext.h"
using namespace std;
/*用ODBC API访问数据库:连接数据库*/
int main(){
SQLHENV henv; //环境句柄
SQLHDBC hdbc;
//连接句柄
SQLHSTMT hstmt; //语句句柄
SQLRETURN retcode; //返回值
/*分配环境句柄*/
retcode =
SQLAllocHandle(SQL_HANDLE_ENV,SQL_NULL_HANDLE,&henv);
if(retcode
== SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO){
/*设置ODBC环境属性*/
retcode =
SQLSetEnvAttr(henv,SQL_ATTR_ODBC_VERSION,(void*)SQL_OV_ODBC3,0);
if(retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO){
/*分配连接句柄*/
retcode =
SQLAllocHandle(SQL_HANDLE_DBC,henv,&hdbc);
if(retcode ==
SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO){
/*连接到数据源*/
retcode = SQLConnect (hdbc,
(SQLCHAR*)"Sales",SQL_NTS,(SQLCHAR*)"",SQL_NTS, (SQLCHAR*)"",SQL_NTS);
if(retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO){
/*分配语句句柄*/
retcode =
SQLAllocHandle(SQL_HANDLE_STMT,hdbc,&hstmt);
if(retcode
== SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO){
/*处理数据*/
cout << "ok" << endl;
SQLFreeHandle(SQL_HANDLE_STMT,hstmt);
}
SQLDisconnect(hdbc);
}
SQLFreeHandle(SQL_HANDLE_DBC,hdbc);
}
}
}
return 0;
}
其中，Sales为数据源，因为数据源没有用户名和密码，所以，紧接着两个参数都为“”。
在vc++ 6.0里，用c++通过ODBC API,使用函数SQLConnect连接数据库。
#include
#include
#include "sqlext.h"
using namespace std;
/*用ODBC API访问数据库:连接数据库*/
int main(){
SQLHENV henv; //环境句柄
SQLHDBC hdbc; //连接句柄
SQLHSTMT hstmt; //语句句柄
SQLRETURN retcode; //返回值
/*分配环境句柄*/
retcode = SQLAllocHandle(SQL_HANDLE_ENV,SQL_NULL_HANDLE,&henv);
if(retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO){
/*设置ODBC环境属性*/
retcode = SQLSetEnvAttr(henv,SQL_ATTR_ODBC_VERSION,(void*)SQL_OV_ODBC3,0);
if(retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO){
/*分配连接句柄*/
retcode = SQLAllocHandle(SQL_HANDLE_DBC,henv,&hdbc);
if(retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO){
/*连接到数据源*/
retcode = SQLConnect (hdbc, (SQLCHAR*)"Sales",SQL_NTS,(SQLCHAR*)"",SQL_NTS, (SQLCHAR*)"",SQL_NTS);
if(retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO)
{
/*分配语句句柄*/
retcode = SQLAllocHandle(SQL_HANDLE_STMT,hdbc,&hstmt);
if(retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO)
{
/*处理数据*/
cout << "ok" << endl;
SQLFreeHandle(SQL_HANDLE_STMT,hstmt);
}
SQLDisconnect(hdbc);
}
SQLFreeHandle(SQL_HANDLE_DBC,hdbc);
}
}
}
return 0;
}
其中，Sales为数据源，因为数据源没有用户名和密码，所以，紧接着两个参数都为“”。
为了完成这学期的数据库课程设计。于是先做了一下使用odbc连接mysql数据库的实验，代码如下：
//我连接的是用户dsn，数据源的名字是market
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
using namespace std;
class SqlSearch
{
public:
void SetDatabase(WCHAR* const name)
{lstrcpy(database,name);}
void SetUser( WCHAR* const tmpu,WCHAR* const tmpp)
{lstrcpy(user,tmpu);lstrcpy(psw,tmpp);}
void DisConnect()
{SQLFreeHandle(SQL_HANDLE_DBC,hconn);}
bool Connect()
{
short tmp;
tmp=SQLAllocHandle(SQL_HANDLE_ENV,SQL_NULL_HANDLE,&henv);
if(tmp!=SQL_SUCCESS&&tmp!=SQL_SUCCESS_WITH_INFO)
return false;
tmp=SQLSetEnvAttr(henv,SQL_ATTR_ODBC_VERSION,(void*)SQL_OV_ODBC3,0);
if(tmp!=SQL_SUCCESS&&tmp!=SQL_SUCCESS_WITH_INFO)
return false;
tmp=SQLAllocHandle(SQL_HANDLE_DBC,henv,&hconn);
if(tmp!=SQL_SUCCESS&&tmp!=SQL_SUCCESS_WITH_INFO)
return false;
tmp=SQLConnect(hconn,database,lstrlen(database),user,lstrlen(user),psw,lstrlen(psw));
if(tmp!=SQL_SUCCESS&&tmp!=SQL_SUCCESS_WITH_INFO)
return false;
return true;
}
bool ExcuteSqldml(WCHAR* sql,HANDLE& hstmt)
{
bool flag=true;
short tmp;
do{
tmp=SQLAllocHandle(SQL_HANDLE_STMT,hconn,&hstmt);
if(tmp!=SQL_SUCCESS&&tmp!=SQL_SUCCESS_WITH_INFO)
{return false;}
tmp=SQLSetStmtAttr(hstmt,SQL_ATTR_CURSOR_TYPE,(void*)SQL_CURSOR_STATIC,0);
if(tmp!=SQL_SUCCESS&&tmp!=SQL_SUCCESS_WITH_INFO)
{flag=false;break;}
int len=lstrlen(sql);
tmp=SQLExecDirect(hstmt,sql,len);
if(tmp!=SQL_SUCCESS&&tmp!=SQL_SUCCESS_WITH_INFO)
{flag=false;break;}
}while(0);
return flag;
}
protected:
HANDLE henv;
HANDLE hconn;
WCHAR database[100];//数据库名
WCHAR user[100];//用户名
WCHAR psw[100];//密码
};
WCHAR * sql=L"select * from goods";
struct Result
{
char id[10];
char name[10];
char price[10];
};
int main()
{
SqlSearch wss;
wss.SetDatabase(L"market");
wss.SetUser(L"root",L"jy03192178");
if(!wss.Connect())
return 0;
HANDLE hstmt;
wss.ExcuteSqldml(sql,hstmt);
Result result;
SQLBindCol(hstmt,1,SQL_C_CHAR,&result.id[0],sizeof(result.id),NULL);
SQLBindCol(hstmt,2,SQL_C_CHAR,&result.name[0],sizeof(result.id),NULL);
SQLBindCol(hstmt,3,SQL_C_CHAR,&result.price[0],sizeof(result.id),NULL);
while(SQLFetch(hstmt)!=SQL_NO_DATA)
cout<
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