OTL 4.0, Example 502 (MS SQL Server stored procedure call)

This example demonstrates a stored procedure call.

Source Code

#include <iostream>
using namespace std;

#include <stdio.h>
#define OTL_ODBC_MSSQL_2005 // Compile OTL 4/ODBC, MS SQL 2005
#define OTL_FREETDS_ODBC_WORKAROUNDS // Enable the FreeTDS / ODBC workarounds for MS SQL
//#define OTL_ODBC // Compile OTL 4/ODBC. Uncomment this when used with MS SQL 7.0/ 2000
//#define OTL_ODBC_UNIX // Compile OTL 4 / ODBC. Uncomment this when used in Linux / Unix
#include <otlv4.h>

otl_connect db; // connect object

void stored_proc(void)
// invoking stored procedure
{ 
 otl_stream o(1, // buffer size should be equal to 1 in case of stored procedure call
              "{call my_proc("
              " :A<int,inout>, "
              " :B<char[31],out>, "
              " :C<char[31],in> "
              ")}",
                 // stored procedure call
              db // connect object
             );

 o.set_commit(0); // set stream auto-commit off since
                  // the stream does not generate transaction

 o<<1<<"Test String1"; // assigning :1 = 1, :3 = "Test String1"

 int a;
 char b[31];

 o>>a>>b;
 cout<<"A="<<a<<", B="<<b<<endl;

}

int main()
{
 otl_connect::otl_initialize(); // initialize ODBC environment
 try{
  db.rlogon("uid=scott;pwd=tiger;dsn=freetds_mssql"); // connect to ODBC
  db.direct_exec("drop procedure my_proc",0); // drop the procedure if it exists.
  db.direct_exec
   (
    "CREATE PROCEDURE my_proc "
    "  @A int out, "
    "  @B varchar(60) out, "
    "  @C varchar(60) "
    "AS "
    "BEGIN "
    "  SELECT @A=@A+1"
    "  SELECT @B=@C "
    "END"
   );  // create stored procedure

  stored_proc(); // invoking stored procedure
 }
 catch(otl_exception& p){ // intercept OTL exceptions
  cerr<<p.msg<<endl; // print out error message
  cerr<<p.code<<endl; // print out error code
  cerr<<p.var_info<<endl; // print out the variable that caused the error
  cerr<<p.sqlstate<<endl; // print out SQLSTATE message
  cerr<<p.stm_text<<endl; // print out SQL that caused the error
 }
 db.logoff(); // disconnect from the data source
 return 0;
}

Output

 A=2, B=Test String1

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