OTL 4.0, Example 473 (OCI7, otl_datetime and Oracle 9i TIMESTAMP type)

This example demonstrates an INSERT and SELECT with Oracle9i TIMESTAMPs and otl_datetime.

Source Code

#include <iostream>
using namespace std;

#include <stdio.h>

#define OTL_ORA7 // Compile OTL 4.0/OCI7
#define OTL_ORA7_TIMESTAMP_TO_STRING(tm,s)      \
{                                               \
  sprintf(s,                                    \
          "%02d/%02d/%04d %02d:%02d:%02d.%06ld",\
          tm.month,                             \
          tm.day,                               \
          tm.year,                              \
          tm.hour,                              \
          tm.minute,                            \
          tm.second,                            \
          tm.fraction                           \
         );                                     \
}

#define OTL_ORA7_STRING_TO_TIMESTAMP(s,tm)       \
{                                                \
  sscanf(s,                                      \
          "%02d/%02d/%04d %02d:%02d:%02d.%06ld", \
          &tm.month,                             \
          &tm.day,                               \
          &tm.year,                              \
          &tm.hour,                              \
          &tm.minute,                            \
          &tm.second,                            \
          &tm.fraction                           \
         );                                      \
}

#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(50, // buffer size
              "insert into test_tab2 "
              "values(:f1<int>, "
               "      to_timestamp(:f2<char[28]>,'MM/DD/YYYY HH24:MI:SS.FF'))", 
                 // SQL statement
              db // connect object
             );

 otl_datetime tm;

 for(int i=1;i<=10;++i){
  tm.year=2007;
  tm.month=1;
  tm.day=19;
  tm.hour=23;
  tm.minute=12;
  tm.second=12;
 // 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 parts.
  tm.frac_precision=6;
  tm.fraction=123456;
  o<<i;
  o<<tm; // otl_datetime can be written into a 
         // char[XXX] variable when appropriate 
         // conversion is #defined
 }
}

void select(void)
{ 
 otl_stream i(50, // buffer size
              "select "
              "  f1, "
              "  to_char(f2,'MM/DD/YYYY HH24:MI:SS.FF') f2 "
               "from test_tab2 where f1 between :f1<int> and :f1*2",
                 // SELECT statement
              db // connect object
             ); 
   // create select stream
 
 int f1;
 otl_datetime f2;

 i<<4; // assigning :f1 = 4
   // SELECT automatically executes when all input variables are
   // assigned. First portion of out rows is fetched to the buffer

 // 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 parts.
 f2.frac_precision=6; // microseconds

 while(!i.eof()){ // while not end-of-data
  i>>f1;
  i>>f2; // otl_datetime can be read from a 
         // char[XXX] variable when appropriate 
         // conversion is #defined
  cout<<"f1="<<f1<<", f2="<<f2.month<<"/"<<f2.day<<"/"
      <<f2.year<<" "<<f2.hour<<":"<<f2.minute<<":"
      <<f2.second<<"."
      <<f2.fraction
      <<endl;
 }
 
}

int main()
{
 otl_connect::otl_initialize(); // initialize OCI environment
 try{

  db.rlogon("scott/tiger"); // connect to Oracle

  otl_cursor::direct_exec
   (
    db,
    "drop table test_tab2",
    otl_exception::disabled // disable OTL exceptions
   ); // drop table

  otl_cursor::direct_exec
   (
    db,
    "create table test_tab2(f1 int, f2 timestamp)"
    );  // 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 Oracle

 return 0;

}

Output

f1=4, f2=1/19/2007 23:12:12.123456
f1=5, f2=1/19/2007 23:12:12.123456
f1=6, f2=1/19/2007 23:12:12.123456
f1=7, f2=1/19/2007 23:12:12.123456
f1=8, f2=1/19/2007 23:12:12.123456

Examples Contents Go Home

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.