OTL 4.0, Example 227 (otl_datetime container and datetime/date table columns, MyODBC 3.50)

Example 227 (otl_datetime container and datetime/date table columns, MyODBC 3.50)

This example demonstrates simple INSERT/SELECT with MySQL's DATETIMEs/DATEs and otl_datetime.

Source Code

#include <iostream>
using namespace std;

#include <stdio.h>

#define OTL_ODBC // Compile OTL 4.0/ODBC
// The following #define is required with MyODBC 3.51.11 and higher
#define OTL_ODBC_SELECT_STM_EXECUTE_BEFORE_DESCRIBE
// #define OTL_ODBC_UNIX // uncomment this line if UnixODBC is used
#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, // buffer size should be == 1 on INSERT
              "insert into test_tab2 "
              "values(:f1<int>,:f2<timestamp>,:f3<timestamp>)", 
                 // INSERT statement
              db // connect object
             );
 o.set_commit(0); // turn off the stream's "auto-commit", because MySQL
                  // does not have any transaction support [yet].
 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;
  o<<i<<tm<<tm;
 }
}

void select(void)
{ 
 otl_stream i(50, // buffer size may be > 1
              "select * from test_tab2",
                 // SELECT statement
              db // connect object
             ); 
   // create select stream
 
 int f1;
 otl_datetime f2,f3;

 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;
  cout<<", f3="<<f3.month<<"/"<<f3.day<<"/"
      <<f3.year<<" "<<f3.hour<<":"<<f3.minute<<":"
      <<f3.second;
  cout<<endl;
 }
 
}

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

  db.rlogon("scott/tiger@mysql35"); // connect to ODBC

  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 datetime, f3 date)"
    );  // 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.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, f3=10/19/1998 0:0:0 
f1=2, f2=10/19/1998 23:12:12, f3=10/19/1998 0:0:0
f1=3, f2=10/19/1998 23:12:12, f3=10/19/1998 0:0:0
f1=4, f2=10/19/1998 23:12:12, f3=10/19/1998 0:0:0
f1=5, f2=10/19/1998 23:12:12, f3=10/19/1998 0:0:0
f1=6, f2=10/19/1998 23:12:12, f3=10/19/1998 0:0:0
f1=7, f2=10/19/1998 23:12:12, f3=10/19/1998 0:0:0
f1=8, f2=10/19/1998 23:12:12, f3=10/19/1998 0:0:0
f1=9, f2=10/19/1998 23:12:12, f3=10/19/1998 0:0:0
f1=10, f2=10/19/1998 23:12:12, f3=10/19/1998 0:0:0

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.