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<title>OTL 4.0, Example 116 (otl_stream::set_flush(), Oracle 8/8i)</title>
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<h1 align="center">OTL 4.0, Example 116 (otl_stream::set_flush(),
Oracle
8/8i)</h1>
<h1>Example 116 (otl_stream::set_flush(), Oracle 8/8i)</h1>
<p>This example demonstrates the otl_stream::<a
href="otl3_stream_class.htm#set_flush">set_flush</a>()
function.</p>
<h2>Source Code</h2>
<pre>#include <iostream><br>#include <stdio.h><br><br>// Uncomment the line below when OCI7 is used with OTL<br>// #define OTL_ORA7 // Compile OTL 4.0/OCI7 <br>
using namespace std;
<pre>#define OTL_ORA8 // Compile OTL 4.0/OCI8<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 insert1()<br>// insert rows into table<br>{ <br> <a
href="otl3_stream_class.htm">otl_stream</a> o; // define an otl_stream variable<br><br> o.<a
href="otl3_stream_class.htm#set_flush">set_flush</a>(false); // set the auto-flush flag to OFF.<br><br>o.open(200, // buffer size<br> "insert into test_tab values(:f1<float>,: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<<(float)i<<tmp;<br> if(i%55==0)<br> throw "Throwing an exception";<br> }<br> o.<a
href="otl3_stream_class.htm#flush">flush</a>(); // when the auto-flush flag is OFF, an explicit flush<br> // of the stream buffer is required in case of successful<br> // completion of execution of the INSERT statement.<br>// In case of a raised exception, the stream buffer would not be flushed. <br>}<br><br>void insert2()<br>// insert rows into table<br>{ <br> <a
href="otl3_stream_class.htm">otl_stream</a> o; // define an otl_stream variable<br><br> o.<a
href="otl3_stream_class.htm#set_flush">set_flush</a>(false); // set the auto-flush flag to OFF.<br><br>o.open(200, // buffer size<br> "insert into test_tab values(:f1<float>,: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<<(float)i<<tmp;<br>// if(i%55==0)<br>// throw "Throwing an exception";<br> }<br> o.<a
href="otl3_stream_class.htm#flush">flush</a>(); // when the auto-flush flag is OFF, an explicit flush<br> // of the stream buffer is required in case of successful<br> // completion of execution of the INSERT statement.<br>// In case of a raised exception, the stream buffer would not be flushed. <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 where f1>=:f<int> and f1<=:f*2",<br> // SELECT statement<br> db // connect object<br> ); <br> // create select stream<br> <br> float f1;<br> char f2[31];<br><br> i<<8; // assigning :f = 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; // assigning :f = 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 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(f1 number, f2 varchar2(30))"<br> ); // create table<br><br> try{<br> insert1(); // insert records into table<br> }catch(const char* p){<br> cout<<p<<endl;<br> }<br> cout<<"Selecting the first time around:"<<endl;<br> select(); // select records from table<br> <br> insert2();<br> cout<<"Selecting the second time around:"<<endl;<br> select();<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 Oracle<br><br> return 0;<br><br>}<br></pre>
<h2>Output</h2>
<pre>Throwing an exception<br>Selecting the first time around:<br>Selecting the second time around:<br>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
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href="mailto:skuchin@gmail.com">skuchin@yahogmail</a>
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