# OTL 4.0, Example 147 (backward compatibility with ODBC 2.5)

# Example 147 (backward compatibility with ODBC 2.5)

This example demonstrates OTL's backward compatibility with ODBC 2.5. In this example, Miscrosoft's old ODBC driver for Oracle is used, because it's compatible with the ODBC 2.5 specification.

## Source Code

    #include <iostream>
    using namespace std;

    #include <stdio.h>
    #include <string.h>
    #include <stdlib.h>

    #define OTL_ODBC // Compile OTL 4.0/ODBC
    #define ODBCVER 0x0250 // forcing the ODBC SDK to behave as ODBC 2.5
    #include <otlv4.h> // include the OTL 4.0 header file

    otl_connect db; // connect object

    void insert()
    // insert rows into table
    {
     otl_stream o(1, // buffer size should be == 1 always on INSERT
                  "insert into test_tab values(:f1<int>,:f2<char[31]>)",
                     // SQL statement
                  db // connect object
                 );
     char tmp[32];

     for(int i=1;i<=100;++i){
      sprintf(tmp,"Name%d",i);
      o<<i<<tmp;
     }
    }

    void update(const int af1)
    // insert rows into table
    {
     otl_stream o(1, // buffer size should be == 1 always on UPDATE
                  "UPDATE test_tab "
                  "   SET f2=:f2<char[31]> "
                  " WHERE f1=:f1<int>",
                     // UPDATE statement
                  db // connect object
                 );

     o<<"Name changed"<<af1;
     o<<otl_null()<<af1+1; // set f2 to NULL

    }

    void select(const int af1)
    {
     otl_stream i(50, // buffer size may be > 1
                  "select * from test_tab where f1>=:f11<int> and f1<=:f12<int>*2",
                     // SELECT statement
                  db // connect object
                 );
       // create select stream

     int f1;
     char f2[31];

     i<<af1<<af1; // Writing input values into the stream
     while(!i.eof()){ // while not end-of-data
      i>>f1;
      cout<<"f1="<<f1<<", f2=";
      i>>f2;
      if(i.is_null())
       cout<<"NULL";
      else
       cout<<f2;
      cout<<endl;
     }

    }

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

      db.rlogon("UID=scott;PWD=tiger;DSN=msora7"); // connect to ODBC
    //  db.rlogon("scott/tiger@msora7"); // connect to ODBC, alternative format
                                         // of connect string

      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 varchar(30))"
        );  // create table

      insert(); // insert records into the table
      update(10); // update records in the table
      select(8); // select records from the table

     }

     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

    f1=8, f2=Name8
    f1=9, f2=Name9
    f1=10, f2=Name changed
    f1=11, f2=NULL
    f1=12, f2=Name12
    f1=13, f2=Name13
    f1=14, f2=Name14
    f1=15, f2=Name15
    f1=16, f2=Name16

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