OTL 4.0, Example 686 (otl_datetime container and a TIMESTAMP WITH TIME ZONE table column under #define OTL_UNICODE)

This example demonstrates simple INSERT/SELECT with  TIMESTAMPs WITH TIME ZONE for PostgreSQL and otl_datetime.

Source Code

#include <iostream>
using namespace std;

#include <stdio.h>

#define OTL_UNICODE // enable Unicode (UTF-16)

// Uncomment the line below if you use #define OTL_UNICODE_CHAR_TYPE
//#define OTL_UNICODE_CHAR_TYPE wchar_t

// #define OTL_ODBC_UNIX // uncomment this line if UnixODBC is used
#define OTL_ODBC_ALTERNATE_RPC
#if !defined(_WIN32) && !defined(_WIN64)
#define OTL_ODBC
#else
#define OTL_ODBC_POSTGRESQL // required with PG ODBC on Windows
#endif
#define OTL_ODBC_TIME_ZONE
#define OTL_ODBC_STRING_TO_TIMESTAMP(str,tm) \
{ \
swscanf(str, \
L"%04d-%02d-%02d %02d:%02d:%02d.%06ld%hd", \
&tm.year, \
&tm.month, \
&tm.day, \
&tm.hour, \
&tm.minute, \
&tm.second, \
&tm.fraction, \
&tm.tz_hour); \
}

#define OTL_ODBC_TIMESTAMP_TO_STRING(tm,str) \
{ \
swprintf(str, \
L"%04d-%02d-%02d %02d:%02d:%02d.%06ld %+hd", \
tm.year, \
tm.month, \
tm.day, \
tm.hour, \
tm.minute, \
tm.second, \
tm.fraction, \
tm.tz_hour); \
}

#include <otlv4.h> // include the OTL 4.0 header file


otl_connect db; // connect object

void insert(void)
// 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[60]>, :f3<char[60]>)", 
                   // INSERT statement, :f2, and :f3 need to be declared as char[XX]
// in order for otl_datetime-to-string conversion to work.
              db // connect object
             );

 otl_datetime tm;

 for(int i=1;i<=10;++i){
  tm.year=1998;
  tm.month=10;
  tm.day=19;
  tm.hour=23;
  tm.minute=12;
  tm.second=12;
tm.frac_precision=6; // microseconds
tm.fraction=123456;
tm.tz_hour=-5; // time zone offset in hours
tm.tz_minute=0;
  o<<i<<tm<<tm;
 }
}

void select(void)

 otl_stream i(5, // stream buffer size can be > great 1 on SELECT.
              "select f1, f2\\:\\:varchar, f3\\:\\:varchar from test_tab",
// f2, f3 need to be converted into varchar/string,
// for example: f2::varchar
               // SELECT statement
              db // connect object
             ); 

int f1;
otl_datetime f2, f3;

// Second's precision needs to be specified BEFORE the stucture can be
// used either for writing or reading timestamp values, which have second's
// fractional part.
f2.frac_precision=6; // milliseconds

while(!i.eof()){ // while not end-of-data
i>>f1>>f2>>f3;
cout<<"f1="<<f1;
cout<<", f2="<<f2.month<<"/"<<f2.day<<"/"
<<f2.year<<" "<<f2.hour<<":"<<f2.minute<<":"
<<f2.second<<"."
<<f2.fraction;
if(f2.tz_hour>=0)
cout<<" +"<<f2.tz_hour;
else
cout<<" "<<f2.tz_hour;
cout<<", f3="<<f3.month<<"/"<<f3.day<<"/"
<<f3.year<<" "<<f3.hour<<":"<<f3.minute<<":"
<<f3.second<<"."
<<f3.fraction;
cout<<endl;
}
 
}
int main()
{
 otl_connect::otl_initialize(); // initialize ODBC environment
 try{

  db.rlogon("scott/tiger@postgresql"); // connect to 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 timestamp(6) with time zone, f3 timestamp(6))"
    );  // create table

db.commit(); // commit DDL statements

  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.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=1, f2=10/19/1998 23:12:12.123456 -5, f3=10/19/1998 23:12:12.123456
f1=2, f2=10/19/1998 23:12:12.123456 -5, f3=10/19/1998 23:12:12.123456
f1=3, f2=10/19/1998 23:12:12.123456 -5, f3=10/19/1998 23:12:12.123456
f1=4, f2=10/19/1998 23:12:12.123456 -5, f3=10/19/1998 23:12:12.123456
f1=5, f2=10/19/1998 23:12:12.123456 -5, f3=10/19/1998 23:12:12.123456
f1=6, f2=10/19/1998 23:12:12.123456 -5, f3=10/19/1998 23:12:12.123456
f1=7, f2=10/19/1998 23:12:12.123456 -5, f3=10/19/1998 23:12:12.123456
f1=8, f2=10/19/1998 23:12:12.123456 -5, f3=10/19/1998 23:12:12.123456
f1=9, f2=10/19/1998 23:12:12.123456 -5, f3=10/19/1998 23:12:12.123456
f1=10, f2=10/19/1998 23:12:12.123456 -5, f3=10/19/1998 23:12:12.123456

Examples ContentsGo Home

Copyright © 1996-2017, Sergei Kuchin, email: skuchin@gmail.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. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.