📄 otl4_ex251.htm
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<title>OTL 4.0, Example 251 (OTL tracing, ODBC, MS SQL Server)</title>
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<h1 align="center">OTL 4.0, Example 251 (OTL tracing, ODBC, MS SQL
Server)</h1>
<h1>Example 251 (OTL tracing, ODBC, MS SQL Server)</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</span><br>// 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>#define OTL_ODBC_MSSQL_2005 // Compile OTL 4/ODBC, MS SQL 2005<br>//#define OTL_ODBC // Compile OTL 4/ODBC. Uncomment this when used with MS SQL 7.0/ 2000<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 ODBC environment<br> try{<br><br> db.rlogon("scott/tiger@mssql"); // 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>
<pre>MY OTL TRACE ==> otl_connect(this=0042FB1C)::rlogon(connect_str="scott/*****@mssql", auto_commit=0); <br>MY OTL TRACE ==> otl_cursor::direct_exec(connect=0042FB14,sqlstm="drop table test_tab",exception_enabled=0);<br>MY OTL TRACE ==> otl_cursor::direct_exec(connect=0042FB14,sqlstm="create table test_tab(f1 int, f2 varchar(30))",exception_enabled=1);<br>MY OTL TRACE ==> otl_stream(this=0012FF00)::open(buffer_size=10, sqlstm=insert into test_tab values(:f1<int>,:f2<char[31]>), connect=0042FB14, implicit_select=0); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:f1, value=1); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(char*: ftype=1, placeholder=:f2, value="Name1"); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:f1, value=2); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(char*: ftype=1, placeholder=:f2, value="Name2"); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:f1, value=3); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(char*: ftype=1, placeholder=:f2, value="Name3"); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:f1, value=4); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(char*: ftype=1, placeholder=:f2, value="Name4"); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:f1, value=5); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(char*: ftype=1, placeholder=:f2, value="Name5"); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:f1, value=6); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(char*: ftype=1, placeholder=:f2, value="Name6"); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:f1, value=7); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(char*: ftype=1, placeholder=:f2, value="Name7"); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:f1, value=8); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(char*: ftype=1, placeholder=:f2, value="Name8"); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:f1, value=9); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(char*: ftype=1, placeholder=:f2, value="Name9"); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:f1, value=10); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(char*: ftype=1, placeholder=:f2, value="Name10"); <br>MY OTL TRACE ==> otl_stream, executing SQL Stm=insert into test_tab values(? ,? ), current batch size=10, row offset=0<br>MY OTL TRACE ==> otl_connect(this=0042FB14)::commit(); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:f1, value=11); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(char*: ftype=1, placeholder=:f2, value="Name11"); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:f1, value=12); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(char*: ftype=1, placeholder=:f2, value="Name12"); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:f1, value=13); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(char*: ftype=1, placeholder=:f2, value="Name13"); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:f1, value=14); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(char*: ftype=1, placeholder=:f2, value="Name14"); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:f1, value=15); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(char*: ftype=1, placeholder=:f2, value="Name15"); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:f1, value=16); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(char*: ftype=1, placeholder=:f2, value="Name16"); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:f1, value=17); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(char*: ftype=1, placeholder=:f2, value="Name17"); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:f1, value=18); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(char*: ftype=1, placeholder=:f2, value="Name18"); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:f1, value=19); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(char*: ftype=1, placeholder=:f2, value="Name19"); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:f1, value=20); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(char*: ftype=1, placeholder=:f2, value="Name20"); <br>MY OTL TRACE ==> otl_stream, executing SQL Stm=insert into test_tab values(? ,? ), current batch size=10, row offset=0<br>MY OTL TRACE ==> otl_connect(this=0042FB14)::commit(); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:f1, value=21); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(char*: ftype=1, placeholder=:f2, value="Name21"); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:f1, value=22); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(char*: ftype=1, placeholder=:f2, value="Name22"); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:f1, value=23); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(char*: ftype=1, placeholder=:f2, value="Name23"); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::close(); <br>MY OTL TRACE ==> otl_stream, executing SQL Stm=insert into test_tab values(? ,? ), current batch size=3, row offset=0<br>MY OTL TRACE ==> otl_connect(this=0042FB14)::commit(); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::open(buffer_size=5, sqlstm=select * from test_tab where f1>=:f<int> and f1<=:ff<int>*2, connect=0042FB14, implicit_select=0); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:f, value=8); <br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator <<(int: ftype=4, placeholder=:ff, value=8); <br>MY OTL TRACE ==> otl_stream, executing SQL Stm=select * from test_tab where f1>=? and f1<=? *2, buffer size=5<br>MY OTL TRACE ==> otl_stream, fetched the first batch of rows, SQL Stm=select * from test_tab where f1>=? and f1<=? *2, RPC=5<br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator >>(float& : ftype=4, placeholder=, value=8);<br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator >>(char* : ftype=1, placeholder=, value=Name8);<br>f1=8, f2=Name8<br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator >>(float& : ftype=4, placeholder=, value=9);<br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator >>(char* : ftype=1, placeholder=, value=Name9);<br>f1=9, f2=Name9<br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator >>(float& : ftype=4, placeholder=, value=10);<br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator >>(char* : ftype=1, placeholder=, value=Name10);<br>f1=10, f2=Name10<br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator >>(float& : ftype=4, placeholder=, value=11);<br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator >>(char* : ftype=1, placeholder=, value=Name11);<br>f1=11, f2=Name11<br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator >>(float& : ftype=4, placeholder=, value=12);<br>MY OTL TRACE ==> otl_stream, fetched the next batch of rows, SQL Stm=select * from test_tab where f1>=? and f1<=? *2, RPC=9<br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator >>(char* : ftype=1, placeholder=, value=Name12);<br>f1=12, f2=Name12<br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator >>(float& : ftype=4, placeholder=, value=13);<br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator >>(char* : ftype=1, placeholder=, value=Name13);<br>f1=13, f2=Name13<br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator >>(float& : ftype=4, placeholder=, value=14);<br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator >>(char* : ftype=1, placeholder=, value=Name14);<br>f1=14, f2=Name14<br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator >>(float& : ftype=4, placeholder=, value=15);<br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator >>(char* : ftype=1, placeholder=, value=Name15);<br>f1=15, f2=Name15<br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator >>(float& : ftype=4, placeholder=, value=16);<br>MY OTL TRACE ==> otl_stream(this=0012FF00)::operator >>(char* : ftype=1, placeholder=, value=Name16);<br>f1=16, f2=Name16<br>MY OTL TRACE ==> otl_stream(this=0012FF00)::close(); <br>MY OTL TRACE ==> otl_connect(this=0042FB14)::logoff(); <br><br><br><hr
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<p>Copyright © 1996, 2008, Sergei Kuchin, email: <a
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