OTL 4.0, Example 350 (Simple Insert/Select/Update wiht a BOOL column)

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

Source Code

#include <iostream>
using namespace std;

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

// #define OTL_ODBC_UNIX // uncomment this line if UnixODBC is used
#if !defined(_WINDOWS_) && !defined(_WIN64)
#define OTL_ODBC
#else 
#define OTL_ODBC_POSTGRESQL // required with PG ODBC on Windows
#endif
#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, // PostgreSQL 8.1 and higher, the buffer can be > 1
              "insert into test_tab values(:f1<int>,:f2<char[3]>)", 
                 // SQL statement
              db // connect object
             );

 for(int i=1;i<=100;++i){
  o<<i;
  o<<"1"; // "1"/"T" can be used to set the column value to true.
 }
}

void update(const int af1)
// insert rows into table
{ 
 otl_stream o(1, // PostgreSQL 8.1 and higher, the buffer can be > 1
              "UPDATE test_tab "
              "   SET f2=:f2<char[3]> "
              " WHERE f1=:f1<int>", 
                 // UPDATE statement
              db // connect object
             );

 o<<"0"<<af1; // set f2 to false, "0" / "F" can be used to do that.
 o<<otl_null()<<af1+1; // set f2 to NULL

}

void select(const int af1)
{ 
 otl_stream i(50,
              "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[3];

 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@postgresql");

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

   db.commit();

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

  db.commit();

  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=1
f1=9, f2=1
f1=12, f2=1
f1=13, f2=1
f1=14, f2=1
f1=15, f2=1
f1=16, f2=1
f1=10, f2=0
f1=11, f2=NULL

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