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<title>OTL 4.0, Example 652 (OTL tracing)</title>
<meta content="Sergei Kuchin" name="Author">
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<h1 align="center">OTL 4.0, Example 652 (OTL tracing)</h1>
<p>This example demonstrates how to use OTL tracing to trace OTL
function calls.</p>
<h2>Source Code</h2>
<pre>#include <iostream><br>using namespace std;<br>#include <stdio.h></pre>
<pre>unsigned int my_trace_level=<br><span style="color: rgb(0, 0, 0);"> 0x1 | // 1st level of tracing</span><br
style="color: rgb(0, 0, 0);"><span style="color: rgb(0, 0, 0);"> 0x2 | // 2nd level of tracing</span><br
style="color: rgb(0, 0, 0);"><span style="color: rgb(0, 0, 0);"> 0x4 | // 3rd level of tracing</span><br
style="color: rgb(0, 0, 0);"><span style="color: rgb(0, 0, 0);"> 0x8 | // 4th level of tracing<br> 0x10; // 5th level of tracing<br></span>// each level of tracing is represented by its own bit, <br>// so levels of tracing can be combined in an arbitrary order.<br><br>#define <a
href="otl3_compile.htm#OTL_TRACE">OTL_TRACE_LEVEL</a> my_trace_level <br> // enables OTL tracing, and uses my_trace_level as a trace control variable.<br><br>#define OTL_TRACE_STREAM cerr <br> // directs all OTL tracing to cerr<br><br>#define OTL_TRACE_LINE_PREFIX "MY OTL TRACE ==> " <br> // redefines the default OTL trace line prefix. This #define is optional<br><br>// Compile OTL 4.0/ODBC in Windows. Informix CLI uses the <br>// regular ODBC header files in Windows<br>#define <a
href="otl3_compile.htm#OTL_ODBC">OTL_ODBC</a> <br><br>// Uncomment the #defines below in Linux / Unix<br>//#define <a
href="otl3_compile.htm#OTL_ODBC_UNIX">OTL_ODBC_UNIX</a><br>//#define <a
href="otl3_compile.htm#OTL_INFORMIX_CLI">OTL_INFORMIX_CLI</a><br>//#define OTL_ODBC_UNIX<br><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(10, // 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<=23;++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(5, // buffer size<br> "select * from test_tab where f1>=:f<int> and f1<=:ff<int>*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<<8; // assigning :f = 8; :ff = 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 Informix environment<br> try{<br><br> db.rlogon("informix/tigger@informixsql"); // connect to the database<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 the database<br><br> return 0;<br><br>}<br></pre>
<h2>Output</h2>
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