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<title>OTL 4.0, Example 202 (otl_datetime container with TIMESTAMP
values down to microseconds in DB2))</title>
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<h1>OTL 4.0, Example 202 (otl_datetime container with TIMESTAMP values
down
to microseconds in DB2)</h1>
</center>
<h1>
Example 202 (otl_datetime container with TIMESTAMP values down to
microseconds
in DB2)</h1>
This example demonstrates simple INSERT/SELECT with DB2's TIMESTAMPs
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_DB2_CLI // Compile OTL 4.0/DB2-CLI<br>#include <otlv4.h> // include the OTL 4.0 header file<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(3, // stream buffer size in logical rows.<br> "insert into test_tab "<br> "values(:f1<int>,:f2<<a
href="otl3_bind_variables.htm#timestamp">timestamp</a>>)", <br> // INSERT statement<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> o<<i<<tm;<br> }<br>}<br><br>void select(void)<br>{ <br> otl_stream i(5, // stream buffer size in logical rows<br> "select * from test_tab",<br> // SELECT statement<br> db // connect object<br> ); <br> <br> int f1;<br> otl_datetime f2;<br><br> // Second's precision needs to be specified BEFORE the stucture can be<br> // used either for writnig or reading timestamp values, which have second's <br> // fractional part.<br> f2.frac_precision=6; // microseconds<br><br> while(!i.eof()){ // while not end-of-data<br> i>>f1>>f2;<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> cout<<endl;<br> }<br> <br>}</pre>
<pre>int main()<br>{<br> <a href="otl3_connect_class.htm">otl_connect::otl_initialize</a>(); // initialize DB2-CLI environment<br> try{<br><br> db.rlogon("scott/tiger@db2sql"); // connect to DB2<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> <a
href="otl3_const_sql.htm">otl_cursor::direct_exec<br></a> (<br> db,<br> "create table test_tab(f1 int, f2 timestamp)"<br> ); // create table<br><br> insert(); // insert records into table<br> select(); // select records from table<br><br> db.logoff(); // disconnect from DB2<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> return 0;<br><br>}</pre>
<h2>
Output</h2>
<pre>f1=1, f2=10/19/1998 23:12:12.123456<br>f1=2, f2=10/19/1998 23:12:12.123456<br>f1=3, f2=10/19/1998 23:12:12.123456<br>f1=4, f2=10/19/1998 23:12:12.123456<br>f1=5, f2=10/19/1998 23:12:12.123456<br>f1=6, f2=10/19/1998 23:12:12.123456<br>f1=7, f2=10/19/1998 23:12:12.123456<br>f1=8, f2=10/19/1998 23:12:12.123456<br>f1=9, f2=10/19/1998 23:12:12.123456<br>f1=10, f2=10/19/1998 23:12:12.123456<br><hr
width="100%"></pre>
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