OTL 4.0, Example 202 (otl_datetime container with TIMESTAMP values down to microseconds in DB2)

Example 202 (otl_datetime container with TIMESTAMP values down to microseconds in DB2)

This example demonstrates simple INSERT/SELECT with DB2's TIMESTAMPs and otl_datetime.

Source Code

#include <iostream>
using namespace std;

#include <stdio.h>
#define OTL_DB2_CLI // Compile OTL 4.0/DB2-CLI
#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(3, // stream buffer size in logical rows.
              "insert into test_tab "
              "values(:f1<int>,:f2<timestamp>)", 
                 // INSERT statement
              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;
  o<<i<<tm;
 }
}

void select(void)

 otl_stream i(5, // stream buffer size in logical rows
              "select * from test_tab",
                 // SELECT statement
              db // connect object
             ); 
 
 int f1;
 otl_datetime f2;

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

 while(!i.eof()){ // while not end-of-data
  i>>f1>>f2;
  cout<<"f1="<<f1;
  cout<<", f2="<<f2.month<<"/"<<f2.day<<"/"
      <<f2.year<<" "<<f2.hour<<":"<<f2.minute<<":"
      <<f2.second<<"."
      <<f2.fraction;
  cout<<endl;
 }
 
}
int main()
{
 otl_connect::otl_initialize(); // initialize DB2-CLI environment
 try{

  db.rlogon("scott/tiger@db2sql"); // connect to DB2

  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 timestamp)"
    );  // create table

  insert(); // insert records into table
  select(); // select records from table

 db.logoff(); // disconnect from DB2

 }

 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
 }

 return 0;

}

Output

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

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Copyright © 1996-2017, Sergei Kuchin, email: skuchin@gmail.com, skuchin@gmail.com .

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