# OTL 4.0, Example 255 (Explicit bind variables in SELECT statement column definitions, ODBC, MS SQL Server)

This example demonstrates how to use explicit bind variables in SELECT statement column definitions.

## Source Code

    #include <iostream>
    using namespace std;
    #include <stdio.h>

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

    otl_connect db; // connect object

    void insert()
    // insert rows into table
    {
     otl_stream o(50, // buffer size
                  "insert into test_tab values(:f1<int>,:f2<char[31]>,:f3<int>)",
                     // SQL statement
                  db // connect object
                 );
     char tmp[32];

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

    void select()
    {
     otl_stream i(50, // buffer size
                  "select f1 :#1<char[20]>, f2, f3 :#3<short> "
      	      "from test_tab "
      	      "where f1>=:f11<int> "
        	      "  and f1<=:f12<int>*2",
                     // SELECT statement
                  db // connect object
                 );
       // create select stream

     char f1[20];
     char f2[31];
     short int f3;

     i<<4<<4; // assigning :f11 = 8, :f12 = 8
       // SELECT automatically executes when all input variables are
       // assigned. First portion of output rows is fetched to the buffer

     while(!i.eof()){ // while not end-of-data
      i>>f1>>f2>>f3;
      cout<<"f1='"<<f1<<"', f2="<<f2<<", f3="<<f3<<endl;
     }

    }

    int main()
    {
     otl_connect::otl_initialize(); // initialize the databse API environment
     try{

      db.rlogon("scott/tiger@mssql"); // connect to the database

      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), f3 int)"
        );  // create table

      insert(); // insert records into table
      select(); // select records from 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.var_info<<endl; // print out the variable that caused the error
     }

     db.logoff(); // disconnect from the database

     return 0;

    }

## Output

    f1='4', f2=Name4, f3=4
    f1='5', f2=Name5, f3=5
    f1='6', f2=Name6, f3=6
    f1='7', f2=Name7, f3=7
    f1='8', f2=Name8, f3=8

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

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.