# 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

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Copyright © 1996, 2007, Sergei Kuchin, email: skuchin@ispwest.com, skuchin@gmail.com
.

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