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<title>OTL 4.0, Example 264 (OTL stream read iterator, simple SELECT,
DB2 CLI)</title>
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<h1 align="center">OTL 4.0, Example 264 (OTL stream read iterator,
simple SELECT, DB2 CLI)</h1>
<h1>Example 264 (OTL stream read iterator, simple SELECT, DB2 CLI)</h1>
<p>This example demonstrates otl_stream_read_iterator for DB2 CLI.<br>
</p>
<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>#define <a
href="otl3_compile.htm#OTL_STREAM_READ_ITERATOR_ON">OTL_STREAM_READ_ITERATOR_ON</a><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()<br>// insert rows into table<br>{ <br> <a
href="otl3_stream_class.htm">otl_stream</a> o(50, // buffer size<br> "insert into test_tab values(:f1<int>,:f2<char[31]>)", <br> // SQL statement<br> db // connect object<br> );<br> char tmp[32];<br><br> for(int i=1;i<=100;++i){<br> sprintf(tmp,"Name%d",i);<br> o<<i<<tmp;<br> }<br>}<br><br>void select()<br>{ <br> <a
href="otl3_stream_class.htm">otl_stream</a> i(50, // buffer size<br> "select * from test_tab "<br> "where f1>=:f11<int> and f1<=:f12<int>*2",<br> // SELECT statement<br> db // connect object<br> ); <br> // create select stream<br> <br> int f1;<br> char f2[31];<br> <a
href="otl4_stream_read_iterator.htm">otl_stream_read_iterator</a><<a
href="otl3_stream_class.htm">otl_stream</a>,<a
href="otl3_exception_class.htm">otl_exception</a>,<a
href="otl3_lob_stream.htm">otl_lob_stream</a>> rs;<br><br> rs.<a
href="otl4_stream_read_iterator.htm#attach">attach</a>(i); // attach the iterator "rs" to the stream "i".<br> i<<8<<8; // assigning :f11 = 8, :f12 = 8<br> // SELECT automatically executes when all input variables are<br> // assigned. First portion of output rows is fetched to the buffer<br><br> while(rs.<a
href="otl4_stream_read_iterator.htm#next_row">next_row</a>()){ // while not end-of-data<br> rs.<a
href="otl4_stream_read_iterator.htm#get_functions">get</a>(1,f1);<br> rs.<a
href="otl4_stream_read_iterator.htm#get_functions">get</a>(2,f2);<br> cout<<"f1="<<f1<<", f2="<<f2<<endl;<br> }<br><br> rs.<a
href="otl4_stream_read_iterator.htm#detach">detach</a>(); // detach the itertor from the stream<br><br> i<<4<<4; // assigning :f11 = 4, :f12 = 4<br> // SELECT automatically executes when all input variables are<br> // assigned. First portion of output rows is fetched to the buffer<br><br> while(!i.eof()){ // while not end-of-data<br> i>>f1>>f2;<br> cout<<"f1="<<f1<<", f2="<<f2<<endl;<br> }<br><br>}<br><br>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 CLI<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 varchar(30))"<br> ); // create table<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.var_info<<endl; // print out the variable that caused the error<br> }<br><br> db.logoff(); // disconnect from DB2 CLI<br><br> return 0;<br><br>}<br></pre>
<h2>Output</h2>
<pre>f1=8, f2=Name8<br>f1=9, f2=Name9<br>f1=10, f2=Name10<br>f1=11, f2=Name11<br>f1=12, f2=Name12<br>f1=13, f2=Name13<br>f1=14, f2=Name14<br>f1=15, f2=Name15<br>f1=16, f2=Name16<br>f1=4, f2=Name4<br>f1=5, f2=Name5<br>f1=6, f2=Name6<br>f1=7, f2=Name7<br>f1=8, f2=Name8<br><br><br><br><hr
width="100%"></pre>
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<p>Copyright © 1996, 2008, Sergei Kuchin, email: <a
href="mailto:skuchin@aceweb.com">skuchin@aceweb.com</a>,
<a href="mailto:skuchin@gmail.com">skuchin@gmail.com/a>.
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