Accessing SQL Server from C++

Accessing SQL Server from C++

#define DBNTWIN32
#include
#include
#include
#include

// Forward declarations of the error handler and message handler.

int err_handler(PDBPROCESS, INT, INT, INT, LPCSTR, LPCSTR);
int msg_handler(PDBPROCESS, DBINT, INT, INT, LPCSTR, LPCSTR,
LPCSTR, DBUSMALLINT);
main(){
PDBPROCESS dbproc; // The connection with SQL Server.
PLOGINREC login; // The login information.
DBCHAR name[100];
DBCHAR city[100];

//Install user-supplied error- and message-handling functions.

dberrhandle (err_handler);
dbmsghandle (msg_handler);

//Initialize DB-Library.

dbinit ();

//Get a LOGINREC.

login = dblogin ();
DBSETLUSER (login, "my_login");
DBSETLPWD (login, "my_password");
DBSETLAPP (login, "example");

// Get a DBPROCESS structure for communication with SQL Server.

dbproc = dbopen (login, "my_server");

// Retrieve some columns from the authors table in the
// pubs database.
// First, put the command into the command buffer.

dbcmd (dbproc, "SELECT au_lname, city FROM pubs..authors");
dbcmd (dbproc, " WHERE state = 'CA' ");

// Send the command to SQL Server and start execution.

dbsqlexec (dbproc);

// Process the results.

if (dbresults (dbproc) == SUCCEED){

// Bind column to program variables.

dbbind (dbproc, 1, NTBSTRINGBIND, 0, name);
dbbind (dbproc, 2, NTBSTRINGBIND, 0, city);

// Retrieve and print the result rows.

while (dbnextrow (dbproc) != NO_MORE_ROWS){
printf ("%s from %s\n", name, city);
}
}

// Close the connection to SQL Server.

dbexit ();
return (0);
}

int err_handler (PDBPROCESS dbproc, INT severity,
INT dberr, INT oserr, LPCSTR dberrstr, LPCSTR oserrstr){
printf ("DB-Library Error %i: %s\n", dberr, dberrstr);
if (oserr != DBNOERR){
printf ("Operating System Error %i: %s\n", oserr, oserrstr);
}
return (INT_CANCEL);
}

int msg_handler (PDBPROCESS dbproc, DBINT msgno, INT msgstate,
INT severity, LPCSTR msgtext, LPCSTR server,
LPCSTR procedure, DBUSMALLINT line){
printf ("SQL Server Message %ld: %s\n", msgno, msgtext);
return (0);
}