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<title>OTL 4.0, Example 254 (Explicit bind variables in SELECT
statement column definitions, Oracle 8/8i/9i)</title>
<meta content="Sergei Kuchin" name="Author">
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<h1 align="center">OTL 4.0, Example 254 (Explicit bind variables in
SELECT statement column definitions, Oracle 8/8i/9i)</h1>
<p>This example demonstrates how to use <a
href="otl3_bind_variables.htm#SELECT_OVERRIDE">explicit bind variables</a>
in SELECT statement column definitions.<br>
</p>
<h2>Source Code</h2>
<pre>#include <iostream><br>using namespace std;<br>#include <stdio.h></pre>
<pre>//#define OTL_ORA8 // Compile OTL 4.0/OCI8<br>//#define OTL_ORA8I // Compile OTL 4.0/OCI8i<br>#define OTL_ORA9I // Compile OTL 4.0/OCI9i<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]>,:f3<int>)", <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<<i;<br> }<br>}<br><br>void select()<br>{ <br> <a
href="otl3_stream_class.htm">otl_stream</a> i(50, // buffer size<br> "select f1 :#1<char[20]>, f2, f3 :#3<short> "<br> "from test_tab "<br> "where f1>=:f11<int> "<br> " and f1<=:f12<int>*2",<br> // SELECT statement<br> db // connect object<br> ); <br> // create select stream<br> <br> char f1[20];<br> char f2[31];<br> short int f3;<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>>f3;<br> cout<<"f1='"<<f1<<"', f2="<<f2<<", f3="<<f3<<endl;<br> }<br><br>}<br><br>int main()<br>{<br> <a
href="otl3_connect_class.htm">otl_connect::otl_initialize</a>(); // initialize the databse API environment<br> try{<br><br> db.rlogon("scott/tiger"); // 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), f3 int)"<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>f1='4', f2=Name4, f3=4<br>f1='5', f2=Name5, f3=5<br>f1='6', f2=Name6, f3=6<br>f1='7', f2=Name7, f3=7<br>f1='8', f2=Name8, f3=8<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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