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<title>OTL 4.0, Example 676 (otl_datetime container and a
TIME/TIMESTAMP WITH TIME ZONE table column)</title>
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<h1>OTL 4.0, Example 676 (otl_datetime container and a TIMESTAMP WITH
TIME ZONE table
column)</h1>
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This example demonstrates simple INSERT/SELECT with TIMESTAMPs
WITH TIME ZONE for PostgreSQL and <a
href="otl3_stream_class.htm#otl_datetime">otl_datetime</a>.
<h2>Source Code</h2>
<pre>#include <iostream><br>using namespace std;<br><br>#include <stdio.h></pre>
<pre>// #define OTL_ODBC_UNIX // uncomment this line if UnixODBC is used<br>#if !defined(_WINDOWS_) && !defined(_WIN64)<br>#define <a
href="otl3_compile.htm#OTL_ODBC">OTL_ODBC</a><br>#else <br>#define <a
href="otl3_compile.htm#OTL_ODBC_POSTGRESQL">OTL_ODBC_POSTGRESQL</a> // required with PG ODBC on Windows<br>#endif<br>#define <a
href="otl3_compile.htm#OTL_ODBC_TIME_ZONE">OTL_ODBC_TIME_ZONE</a><br>#define <a
href="otl3_compile.htm#OTL_ODBC_STRING_TO_TIMESTAMP">OTL_ODBC_STRING_TO_TIMESTAMP</a>(str,tm) \<br>{ \<br> sscanf(str, \<br> "%04d-%02d-%02d %02d:%02d:%02d.%06ld%hd", \<br> &tm.year, \<br> &tm.month, \<br> &tm.day, \<br> &tm.hour, \<br> &tm.minute, \<br> &tm.second, \<br> &tm.fraction, \<br> &tm.tz_hour); \<br>}<br><br>#define <a
href="otl3_compile.htm#OTL_ODBC_TIMESTAMP_TO_STRING">OTL_ODBC_TIMESTAMP_TO_STRING</a>(tm,str) \<br>{ \<br> sprintf(str, \<br> "%04d-%02d-%02d %02d:%02d:%02d.%06ld %+hd", \<br> tm.year, \<br> tm.month, \<br> tm.day, \<br> tm.hour, \<br> tm.minute, \<br> tm.second, \<br> tm.fraction, \<br> tm.tz_hour); \<br>}<br><br>#include <otlv4.h> // include the OTL 4.0 header file<br><br><br><a
href="otl3_connect_class.htm">otl_connect</a> db; // connect object<br><br>void insert(void)<br>// insert rows into table<br>{ <br> <a
href="otl3_stream_class.htm">otl_stream</a> o(1, // PostgreSQL 8.1 and higher, the buffer can be > 1<br> "insert into test_tab values(:f1<int>,:f2<char[60]>, :f3<char[60]>)", <br> // INSERT statement, :f2, and :f3 need to be declared as char[XX]<br> // in order for otl_datetime-to-string conversion to work.<br> db // connect object<br> );<br><br> <a
href="otl3_stream_class.htm#otl_datetime">otl_datetime</a> tm;<br><br> for(int i=1;i<=10;++i){<br> tm.year=1998;<br> tm.month=10;<br> tm.day=19;<br> tm.hour=23;<br> tm.minute=12;<br> tm.second=12;<br> tm.frac_precision=6; // microseconds<br> tm.fraction=123456;<br> tm.tz_hour=-5; // time zone offset in hours<br> tm.tz_minute=0;<br> o<<i<<tm<<tm;<br> }<br>}<br><br>void select(void)<br>{ <br> otl_stream i(5, // stream buffer size can be > great 1 on SELECT.<br> "select f1, f2\\:\\:varchar, f3\\:\\:varchar from test_tab",<br> // f2, f3 need to be converted into varchar/string, <br> // for example: f2::varchar<br> // SELECT statement<br> db // connect object<br> ); <br><br> int f1;<br> otl_datetime f2, f3;<br><br> // Second's precision needs to be specified BEFORE the stucture can be<br> // used either for writing or reading timestamp values, which have second's <br> // fractional part.<br> f2.frac_precision=6; // milliseconds<br><br> while(!i.eof()){ // while not end-of-data<br> i>>f1>>f2>>f3;<br> cout<<"f1="<<f1;<br> cout<<", f2="<<f2.month<<"/"<<f2.day<<"/"<br> <<f2.year<<" "<<f2.hour<<":"<<f2.minute<<":"<br> <<f2.second<<"."<br> <<f2.fraction;<br> if(f2.tz_hour>=0)<br> cout<<" +"<<f2.tz_hour;<br> else<br> cout<<" "<<f2.tz_hour;<br> cout<<", f3="<<f3.month<<"/"<<f3.day<<"/"<br> <<f3.year<<" "<<f3.hour<<":"<<f3.minute<<":"<br> <<f3.second<<"."<br> <<f3.fraction;<br> cout<<endl;<br> }<br> <br>}</pre>
<pre>int main()<br>{<br> <a href="otl3_connect_class.htm">otl_connect::otl_initialize</a>(); // initialize ODBC environment<br> try{<br><br> db.rlogon("scott/tiger@postgresql"); // connect to PostgreSQL<br><br> <a
href="otl3_const_sql.htm">otl_cursor::direct_exec<br></a> (<br> db,<br> "drop table test_tab",<br> otl_exception::disabled // disable OTL exceptions<br> ); // drop table<br><br> db.commit();<br> <a
href="otl3_const_sql.htm">otl_cursor::direct_exec<br></a> (<br> db,<br> "create table test_tab(f1 int, f2 timestamp(6) with time zone, f3 timestamp(6))"<br> ); // create table<br><br> db.commit(); // commit DDL statements <br><br> insert(); // insert records into table<br> select(); // select records from table<br><br> }<br><br> catch(<a
href="otl3_exception_class.htm">otl_exception</a>& p){ // intercept OTL exceptions<br> cerr<<p.msg<<endl; // print out error message<br> cerr<<p.stm_text<<endl; // print out SQL that caused the error<br> cerr<<p.sqlstate<<endl; // print out SQLSTATE message<br> cerr<<p.var_info<<endl; // print out the variable that caused the error<br> }<br><br> db.logoff(); // disconnect from ODBC<br><br> return 0;<br><br>}</pre>
<h2>
Output</h2>
<pre>f1=1, f2=10/19/1998 23:12:12.123456 -5, f3=10/19/1998 23:12:12.123456<br>f1=2, f2=10/19/1998 23:12:12.123456 -5, f3=10/19/1998 23:12:12.123456<br>f1=3, f2=10/19/1998 23:12:12.123456 -5, f3=10/19/1998 23:12:12.123456<br>f1=4, f2=10/19/1998 23:12:12.123456 -5, f3=10/19/1998 23:12:12.123456<br>f1=5, f2=10/19/1998 23:12:12.123456 -5, f3=10/19/1998 23:12:12.123456<br>f1=6, f2=10/19/1998 23:12:12.123456 -5, f3=10/19/1998 23:12:12.123456<br>f1=7, f2=10/19/1998 23:12:12.123456 -5, f3=10/19/1998 23:12:12.123456<br>f1=8, f2=10/19/1998 23:12:12.123456 -5, f3=10/19/1998 23:12:12.123456<br>f1=9, f2=10/19/1998 23:12:12.123456 -5, f3=10/19/1998 23:12:12.123456<br>f1=10, f2=10/19/1998 23:12:12.123456 -5, f3=10/19/1998 23:12:12.123456<br><hr
width="100%"></pre>
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