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<title>OTL 4.0, Example 25 (Implicit Select/Result Set returned by a
stored procedure)</title>
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<h1 align="center">OTL 4.0, Example 25 (<b>Implicit Select/Result Set
returned
by a stored procedure</b>)</h1>
<h1><a name="example1"></a>Example 25 (<b>Implicit Select/Result Set
returned
by a stored procedure</b>)</h1>
<p>This example demonstrates a stored procedure call.</p>
<h2>Source Code</h2>
<pre>#include <iostream><br>using namespace std;<br><br>#include <stdio.h><br>#define OTL_ODBC // Compile OTL 4.0/ODBC<br>#include <otlv4.h><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<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> }<br>}<br><br>void select(void)<br>// fetching result set returned by a stored procedure<br>{ <br> <a
href="otl3_stream_class.htm">otl_stream</a> i(50, // buffer size<br> "{call my_proc(:f1<int,in>)}",<br> // implicit SELECT statement<br> db, // connect object<br> <a
href="otl3_stream_class.htm#implicit_select">otl_implicit_select</a> // implicit SELECT statement<br> ); <br> // create select stream<br> <br> int f1;<br> char f2[31];<br><br> i<<8; // assigning :f1 = 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 :f1 = 4<br> // SELECT automatically re-executes when all input variables are<br> // assigned. First portion of out 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> otl_connect::otl_initialize(); // initialize ODBC environment<br> try{<br> db.rlogon("uid=scott;pwd=tiger;dsn=mssql"); // connect to ODBC<br> otl_cursor::direct_exec<br> (<br> db,<br> "drop table test_tab",<br> otl_exception::disabled // disable OTL exceptions<br> ); // drop table<br><br> otl_cursor::direct_exec<br> (<br> db,<br> "create table test_tab(f1 int, f2 varchar(30))"<br> ); // create table<br><br> otl_cursor::direct_exec<br> (<br> db,<br> "DROP PROCEDURE my_proc",<br> 0 // ignore any errors<br> ); // drop stored procedure<br><br> otl_cursor::direct_exec<br> (<br> db,<br> "CREATE PROCEDURE my_proc "<br> " @F1 int "<br> "AS "<br> "SELECT * FROM test_tab "<br> "WHERE f1>=@F1 AND f1<=@F1*2 "<br> ); // create stored procedure<br><br><br> insert(); // insert records into table<br> select(); // select records from table<br><br><br> }<br> catch(otl_exception& p){ // intercept OTL exceptions<br> cerr<<p.msg<<endl; // print out error message<br> cerr<<p.code<<endl; // print out error code<br> cerr<<p.var_info<<endl; // print out the variable that caused the error<br> cerr<<p.sqlstate<<endl; // print out SQLSTATE message<br> cerr<<p.stm_text<<endl; // print out SQL that caused the error<br> }<br> db.logoff(); // disconnect from the data source<br> return 0;<br>} <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><br><hr
width="100%"></pre>
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<p>Copyright © 1996, 2008, Sergei Kuchin, email: <a
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