# OTL 4.0, Example 377 (Simple Insert/Select, otl_connect::operator<<, <<=, >>)s

This example demonstrates a simple INSERT, SELECT, constant SQL statements, and otl_connect::operator<<, <<=, >>().

## 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;
     o.setBufSize(50);

    // Send a message (SQL statement) to the otl_connect object.
     db<<="insert into test_tab values(:f1<int>,:f2<char[31]>)";

    // Send a message (SQL statement) from the connect object
    // to the otl_stream object.

     db>>o;

    // By and large, this is all syntactical sugar, but "some like it hot".

     char tmp[32];

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

    void select()
    {
     otl_stream i;

     i.setBufSize(50);

    // Send a message (SQL statement) to the otl_connect object.
     db<<="select * from test_tab where f1>=:f11<int> and f1<=:f12<int>*2";

    // Send a message (SQL statement) from the connect object
    // to the otl_stream object.

     db>>i;

    // By and large, this is all syntactical sugar, but "some like it hot".

     int f1;
     char f2[31];

     i<<8<<8; // 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;
      cout<<"f1="<<f1<<", f2="<<f2<<endl;
     }

     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;
      cout<<"f1="<<f1<<", f2="<<f2<<endl;
     }

    }

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

      db<<"scott/tiger@sapdbsql"; // connect to the database

      // Send SQL statements to the connect obejct for immediate execution.
      // Ignore any exception for the first statement.
      try{ db<<"drop table test_tab"; } catch(otl_exception&){}
      db<<"create table test_tab(f1 int, f2 varchar(30))";

      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=8, f2=Name8
    f1=9, f2=Name9
    f1=10, f2=Name10
    f1=11, f2=Name11
    f1=12, f2=Name12
    f1=13, f2=Name13
    f1=14, f2=Name14
    f1=15, f2=Name15
    f1=16, f2=Name16
    f1=4, f2=Name4
    f1=5, f2=Name5
    f1=6, f2=Name6
    f1=7, f2=Name7
    f1=8, f2=Name8

Examples Contents Go Home

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.