# OTL 4.0, Example 216 (OTL_ADD_NULL_TERMINATOR_TO_STRING_SIZE,
FireBird Database)

# Example 216 (OTL_ADD_NULL_TERMINATOR_TO_STRING_SIZE, FireBird Database)

This example demonstrates simple INSERT, SELECT, UPDATE, constant SQL statements, and #define
OTL_ADD_NULL_TERMINATOR_TO_STRING_SIZE.

## Source Code

    #include <iostream>
    using namespace std;

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

    #define OTL_ODBC // Compile OTL 4.0/ FireBird Database ODBC
    // #define OTL_ODBC_UNIX // uncomment this line if UnixODBC is used
    #define OTL_ADD_NULL_TERMINATOR_TO_STRING_SIZE
    #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[2]>)",
                     // SQL statement
                  db // connect object
                 );

     for(int i=1;i<=100;++i){
      o<<i<<"AB";
     }
    }

    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<<"CD"<<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("scott/tiger@ib6sql"); // 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 varchar(2))"
        );  // create table

      db.commit(); // committing the create table statement to to the database

      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=AB
    f1=9, f2=AB
    f1=10, f2=CD
    f1=11, f2=NULL
    f1=12, f2=AB
    f1=13, f2=AB
    f1=14, f2=AB
    f1=15, f2=AB
    f1=16, f2=AB

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

Permission to use, copy, modify and redistribute this document for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies.