Initial commit

c++/Others/Accessing SQL Server from C++.cpp

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+Accessing SQL Server from C++
+
+#define DBNTWIN32
+#include <stdio.h>
+#include <windows.h>
+#include <sqlfront.h>
+#include <sqldb.h>
+
+// 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);
+}