Hi,
I wants to connect to sql server from visual studio 2008 and fetch data from any table. I need to do it using c++. How i can achieve this? I cna't use any Managed code.
This what i am trying now: I got it from another reference.
In this code, from connection (SQLDriverConnect(), function) onwards its shows errors.
#include "stdafx.h"
#include <windows.h>
#include <sql.h>
#include <sqlext.h>
#include <sqltypes.h>
#include <sqlncli.h>
#include <cstdio>
#include <string>
const int MAX_CHAR = 1024;
bool test_retcode( RETCODE my_code, const char* my_message )
{
bool success = ( my_code == SQL_SUCCESS_WITH_INFO || my_code == SQL_SUCCESS );
if ( ! success )
{
printf( "%s", my_message );
}
return success;
}
int main ( )
{
unsigned char connStrOut[256];
SQLSMALLINT bufsize=0;
SQLHENV EnvironmentHandle;
RETCODE retcode = SQLAllocHandle( SQL_HANDLE_ENV, SQL_NULL_HANDLE, &EnvironmentHandle );
test_retcode( retcode, "SQLAllocHandle(Env) failed!" );
retcode = SQLSetEnvAttr( EnvironmentHandle, SQL_ATTR_ODBC_VERSION, (SQLPOINTER) SQL_OV_ODBC3, SQL_IS_INTEGER );
test_retcode( retcode, "SQLSetEnvAttr(ODBC version) Failed" );
SQLHDBC ConnHandle;
retcode = SQLAllocHandle( SQL_HANDLE_DBC_INFO_TOKEN, EnvironmentHandle, &ConnHandle );
test_retcode( retcode, "Could not allocate MS SQL 2000 connection handle." );
SQLSMALLINT driver_out_length;
retcode = SQLDriverConnect( ConnHandle, NULL,(SQLWCHAR*) "DRIVER={SQL Server};SERVER=(local);UID=labops;PWD=99w1ldf1re;Database=labops;", SQL_NTS, (SQLWCHAR*)connStrOut, 256, &driver_out_length, SQL_DRIVER_NOPROMPT );
test_retcode( retcode, "SQLConnect() Failed" );
SQLHSTMT StatementHandle;
retcode = SQLAllocHandle(SQL_HANDLE_STMT, ConnHandle, &StatementHandle);
test_retcode( retcode, "Failed to allocate SQL Statement handle." );
char* buffer = new char[ MAX_CHAR ];
SQLINTEGER length = MAX_CHAR - 1;
retcode = SQLBindCol( StatementHandle, 1, SQL_C_CHAR,(SQLPOINTER) NULL,(SQLINTEGER) SQL_DATA_AT_EXEC,&length );
test_retcode( retcode, "Failed to bind column." );
retcode = SQLExecDirect( StatementHandle, (SQLWCHAR*) "SELECT * FROM LabopsStatus", SQL_NTS );
test_retcode( retcode, "SQLExecDirect failed." );
getchar();
retcode = SQLFetch( StatementHandle );
if ( retcode != SQL_SUCCESS && retcode != SQL_SUCCESS_WITH_INFO && retcode != SQL_NO_DATA )
{
printf( "Problem fetching row.\n" );
return 9;
}
printf( "Fetched data. length: %d\n", length );
bool sql_success;
std::string data;
RETCODE r2;
do
{
r2 = SQLGetData( StatementHandle, 1, SQL_C_CHAR, buffer, MAX_CHAR, &length );
if ( sql_success = test_retcode( r2, "SQLGetData failed." ) )
{
data.append( buffer );
}
else
{
char* err_msg = new char[ MAX_CHAR ];
SQLSMALLINT req = 1;
SQLCHAR state[6];
SQLINTEGER error;
SQLINTEGER output_length;
int sql_state = SQLGetDiagRec( SQL_HANDLE_STMT, StatementHandle, req, (SQLWCHAR*)state, &error, (SQLWCHAR*) err_msg, (SQLINTEGER) MAX_CHAR, (SQLSMALLINT*) &output_length );
printf( "%s\n", err_msg );
delete err_msg;
return 9;
}
}
while ( sql_success && r2 != SQL_SUCCESS );
printf( "Done.\n" );
getchar();
return 0;
}