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  <title>OTL 4.0, Example 287 (otl_stream::describe_select() with
extended otl_column_desc fields)</title>
  <meta name="Author" content="Sergei Kuchin">
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<h1 align="center">OTL 4.0, Example 287<br>
(otl_stream::describe_select() with extended otl_column_desc fields)</h1>
<h1>Example 287 (otl_stream::describe_select() with
extended otl_column_desc fields)</h1>
<p>This example demonstrates the <a
 href="otl3_stream_class.htm#describe_select">otl_stream::describe_select</a>()
with extended fields in otl_column_desc.<br>
</p>
<h2>Source Code</h2>
<pre>#include &lt;iostream&gt;<br>using namespace std;<br><br>#include &lt;stdio.h&gt;</pre>
<pre>#define OTL_ORA9I // Compile OTL 4.0/OCI9i<br>//#define OTL_ORA10G // Compile OTL 4.0/OCI10g<br>#define OTL_UNICODE // Enable Unicode support<br>#include &lt;otlv4.h&gt; // include the OTL 4.0 header file<br><br><a
 href="otl3_connect_class.htm">otl_connect</a> db; // connect object<br><br>void select()<br>{ <br> <a
 href="otl3_stream_class.htm">otl_stream</a> i(1, // buffer size<br>              "select * from test_tab",<br>                 // SELECT statement<br>              db // connect object<br>             ); <br>   // create select stream<br> <br> <a
 href="otl3_stream_class.htm#otl_column_desc">otl_column_desc</a>* desc;<br> int desc_len;<br><br> desc=i.<a
 href="otl3_stream_class.htm#describe_select">describe_select</a>(desc_len);<br><br> for(int n=0;n&lt;desc_len;++n){<br>  cout&lt;&lt;"========== COLUMN #"&lt;&lt;n+1&lt;&lt;" ==========="&lt;&lt;endl;<br>  cout&lt;&lt;"name="&lt;&lt;desc[n].name&lt;&lt;endl;<br>  cout&lt;&lt;"dbtype="&lt;&lt;desc[n].dbtype&lt;&lt;endl;<br>  cout&lt;&lt;"<a
 href="otl3_stream_class.htm#otl_var_dbtype">otl_var_dbtype</a>="&lt;&lt;desc[n].otl_var_dbtype&lt;&lt;endl;<br>  cout&lt;&lt;"dbsize="&lt;&lt;desc[n].dbsize&lt;&lt;endl;<br>  cout&lt;&lt;"scale="&lt;&lt;desc[n].scale&lt;&lt;endl;<br>  cout&lt;&lt;"prec="&lt;&lt;desc[n].prec&lt;&lt;endl;<br>  cout&lt;&lt;"nullok="&lt;&lt;desc[n].nullok&lt;&lt;endl;<br>  cout&lt;&lt;"charset_form="&lt;&lt;desc[n].charset_form&lt;&lt;endl;<br>  cout&lt;&lt;"char_size="&lt;&lt;desc[n].char_size&lt;&lt;endl;<br> }<br> <br>}<br><br>int main()<br>{<br> <a
 href="otl3_connect_class.htm">otl_connect::otl_initialize</a>(); // initialize OCI environment<br> try{<br><br>  db.rlogon("scott/tiger"); // connect to Oracle<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 "<br>    "(f1 number, f2 varchar2(100), f3 nvarchar2(100), "<br>    "f4 char(100), f5 nchar(100), "<br>    "f6 clob, f7 nclob)"<br>    );  // create table<br><br>  select(); // select records from table<br><br> }<br><br> catch(<a
 href="otl3_exception_class.htm">otl_exception</a>&amp; p){ // intercept OTL exceptions<br>  cerr&lt;&lt;p.msg&lt;&lt;endl; // print out error message<br>  cerr&lt;&lt;p.stm_text&lt;&lt;endl; // print out SQL that caused the error<br>  cerr&lt;&lt;p.var_info&lt;&lt;endl; // print out the variable that caused the error<br> }<br><br> db.logoff(); // disconnect from Oracle<br><br> return 0;<br><br>}<br></pre>
<h2>Output<br>
</h2>
<pre>========== COLUMN #1 ===========<br>name=F1<br>dbtype=2<br>otl_var_dbtype=2<br>dbsize=22<br>scale=129<br>prec=0<br>nullok=1<br>charset_form=0<br>char_size=0<br>========== COLUMN #2 ===========<br>name=F2<br>dbtype=1<br>otl_var_dbtype=1<br>dbsize=100<br>scale=0<br>prec=0<br>nullok=1<br>charset_form=1<br>char_size=100<br>========== COLUMN #3 ===========<br>name=F3<br>dbtype=1<br>otl_var_dbtype=1<br>dbsize=200<br>scale=0<br>prec=0<br>nullok=1<br>charset_form=2<br>char_size=100<br>========== COLUMN #4 ===========<br>name=F4<br>dbtype=96<br>otl_var_dbtype=1<br>dbsize=100<br>scale=0<br>prec=0<br>nullok=1<br>charset_form=1<br>char_size=100<br>========== COLUMN #5 ===========<br>name=F5<br>dbtype=96<br>otl_var_dbtype=1<br>dbsize=200<br>scale=0<br>prec=0<br>nullok=1<br>charset_form=2<br>char_size=100<br>========== COLUMN #6 ===========<br>name=F6<br>dbtype=112<br>otl_var_dbtype=11<br>dbsize=4000<br>scale=0<br>prec=0<br>nullok=1<br>charset_form=1<br>char_size=0<br>========== COLUMN #7 ===========<br>name=F7<br>dbtype=112<br>otl_var_dbtype=11<br>dbsize=4000<br>scale=0<br>prec=0<br>nullok=1<br>charset_form=2<br>char_size=0<br><br><hr
 width="100%"></pre>
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<p>Copyright &copy; 1996, 2008, Sergei Kuchin, email: <a
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<a href="mailto:skuchin@gmail.com">skuchin@yahogmail</a>
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