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<title>OTL 4.0, Example 373 (Simple Insert/Select,
otl_connect::operator<<, <<=, >> )</title>
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<h1 align="center">OTL 4.0, Example 377 (Simple Insert/Select,
otl_connect::operator<<, <<=, >>)s<br>
</h1>
<p>This example demonstrates a simple INSERT, SELECT, constant SQL
statements, and otl_connect::operator<a
href="otl3_connect_class.htm#operator_ll"><<</a>, <a
href="otl3_connect_class.htm#operator_lle"><<=</a>, <a
href="otl3_connect_class.htm#operator_gg">>></a>().<br>
</p>
<h2>Source Code</h2>
<pre>#include <iostream><br>using namespace std;<br><br>#include <stdio.h></pre>
<pre>#define OTL_ODBC // Compile OTL 4.0/ODBC<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;<br> o.<a
href="otl3_stream_class.htm#setBufSize">setBufSize</a>(50);<br><br>// Send a message (SQL statement) to the otl_connect object.<br> db<a
href="otl3_connect_class.htm#operator_lle"><<=</a>"insert into test_tab values(:f1<int>,:f2<char[31]>)";<br><br>// Send a message (SQL statement) from the connect object <br>// to the otl_stream object. <br><br> db<a
href="otl3_connect_class.htm#operator_gg">>></a>o;<br><br>// By and large, this is all syntactical sugar, but "some like it hot".<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;<br><br> i.<a
href="otl3_stream_class.htm#setBufSize">setBufSize</a>(50);<br><br>// Send a message (SQL statement) to the otl_connect object.<br> db<a
href="otl3_connect_class.htm#operator_lle"><<=</a>"select * from test_tab where f1>=:f11<int> and f1<=:f12<int>*2";<br><br>// Send a message (SQL statement) from the connect object <br>// to the otl_stream object. <br><br> db<a
href="otl3_connect_class.htm#operator_gg">>></a>i;<br><br>// By and large, this is all syntactical sugar, but "some like it hot".<br> <br> int f1;<br> char f2[31];<br><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(!i.eof()){ // while not end-of-data<br> i>>f1>>f2;<br> cout<<"f1="<<f1<<", f2="<<f2<<endl;<br> }<br><br> i<<4<<4; // 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(!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 the database API environment<br> try{<br><br> db<a
href="otl3_connect_class.htm#operator_ll"><<</a>"scott/tiger@sapdbsql"; // connect to the database<br><br> // Send SQL statements to the connect obejct for immediate execution. <br> // Ignore any exception for the first statement.<br> try{ db<a
href="otl3_connect_class.htm#operator_ll"><<</a>"drop table test_tab"; } catch(<a
href="otl3_exception_class.htm">otl_exception</a>&){}<br> db<a
href="otl3_connect_class.htm#operator_ll"><<</a>"create table test_tab(f1 int, f2 varchar(30))";<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 the database<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><hr
width="100%"></pre>
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<p>Copyright © 1996, 2008, Sergei Kuchin, email: <a
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<a href="mailto:skuchin@gmail.com">skuchin@gmail.com/A>.
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