# OTL 4.0, Example 105 (OTL/ODBC and MS SQL Server's GUIDs)

# Example 105 (OTL/ODBC and MS SQL Server's GUIDs)

This example demonstrates how OTL/ODBC works with MS SQL Server's GUIDs. Briefly, GUIDs get mapped to C++ null terminated strings on both input and output. GUIDs are supported only by MS SQL Server 7.x and MS SQL Server 2000.

## Source Code

    #include <iostream>
    using namespace std;

    #include <stdio.h>

    #define OTL_ODBC // Compile OTL 4.0/ODBC
    #define OTL_MAP_SQL_GUID_TO_CHAR
    #include <otlv4.h> // include the OTL 4.0 header file

    otl_connect db; // connect object

    void insert()
    // insert rows into table
    {
     otl_stream o(5, // buffer size
                  "insert into test_tab values(:f1<int>,newid())",
                     // SQL statement
                  db // connect object
                 );

     for(int i=1;i<=13;++i)
      o<<i;
    }

    void select()
    {
     otl_stream i(5, // buffer size
                  "select * from test_tab",
                     // SELECT statement
                  db // connect object
                 );
       // create select stream

     otl_stream o(7, // buffer size
                  "insert into test_tab2 values(:f1<int>,:f2<char[37]>)",
                     // INSERT statement
                  db // connect object
                 );
       // create insert stream
     o.set_commit(0); // turnin off the otl_stream's autocommit flag

     int f1;
     char f2[37];

     while(!i.eof()){ // while not end-of-data
      i>>f1>>f2;
      cout<<"f1="<<f1<<", f2="<<f2<<endl;
      o<<f1<<f2;
     }

     o.flush(); // flushing the otl_stream's buffer
     db.commit(); // committing transaction

    }

    int main()
    {
     otl_connect::otl_initialize(); // initialize ODBC environment
     try{

      db.rlogon("UID=scott;PWD=tiger;DSN=mssql"); // connect to ODBC

      otl_cursor::direct_exec
       (
        db,
        "drop table test_tab",
        otl_exception::disabled // disable OTL exceptions
       ); // drop table

      otl_cursor::direct_exec
       (
        db,
        "create table test_tab(f1 int, f2 uniqueidentifier)"
        );  // create table

      otl_cursor::direct_exec
       (
        db,
        "drop table test_tab2",
        otl_exception::disabled // disable OTL exceptions
       ); // drop table

      otl_cursor::direct_exec
       (
        db,
        "create table test_tab2(f1 int, f2 uniqueidentifier)"
        );  // create table

      insert(); // insert records into table
      select(); // select records from test_tab and insert them into test_tab2

     }

     catch(otl_exception& p){ // intercept OTL exceptions
      cerr<<p.msg<<endl; // print out error message
      cerr<<p.stm_text<<endl; // print out SQL that caused the error
      cerr<<p.sqlstate<<endl; // print out SQLSTATE message
      cerr<<p.var_info<<endl; // print out the variable that caused the error
     }

     db.logoff(); // disconnect from ODBC

     return 0;

    }

## Output

    The actual GUID values will be different on each run of this example.

    f1=1, f2=15B6CB56-F9CD-11D4-A633-86FF6E6A224E
    f1=2, f2=15B6CB57-F9CD-11D4-A633-86FF6E6A224E
    f1=3, f2=15B6CB58-F9CD-11D4-A633-86FF6E6A224E
    f1=4, f2=15B6CB59-F9CD-11D4-A633-86FF6E6A224E
    f1=5, f2=15B6CB5A-F9CD-11D4-A633-86FF6E6A224E
    f1=6, f2=15B6CB5B-F9CD-11D4-A633-86FF6E6A224E
    f1=7, f2=15B6CB5C-F9CD-11D4-A633-86FF6E6A224E
    f1=8, f2=15B6CB5D-F9CD-11D4-A633-86FF6E6A224E
    f1=9, f2=15B6CB5E-F9CD-11D4-A633-86FF6E6A224E
    f1=10, f2=15B6CB5F-F9CD-11D4-A633-86FF6E6A224E
    f1=11, f2=15B6CB60-F9CD-11D4-A633-86FF6E6A224E
    f1=12, f2=15B6CB61-F9CD-11D4-A633-86FF6E6A224E
    f1=13, f2=15B6CB62-F9CD-11D4-A633-86FF6E6A224E

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Copyright © 1996, 2007, Sergei Kuchin, email: skuchin@ispwest.com, skuchin@gmail.com
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