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<TITLE>OTL 4.0, Example 17 (otl_stream::describe_select() with a referenved cursor)</TITLE>
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<H1 ALIGN=CENTER>OTL 4.0, Example 17<BR>
(otl_stream::describe_select() with a referenced cursor)</H1>
<H1><A NAME="example1"></A>Example 17(otl_stream::describe_select() with
a referenced cursor)</H1>
<P>This example demonstrates the <A HREF="otl3_stream_class.htm#describe_select">otl_stream::describe_select</A>()
with a referenced cursor.</P>
<H2>Source Code</H2>
<PRE>#include <iostream>
using namespace std;
#include <stdio.h></PRE>
<PRE>#define OTL_ORA8 // Compile OTL 4.0/OCI8
#include <otlv4.h> // include the OTL 4.0 header file
<A HREF="otl3_connect_class.htm">otl_connect</A> db; // connect object</PRE>
<PRE>void insert()
// insert rows into table
{
<A HREF="otl3_stream_class.htm">otl_stream</A> o(50, // buffer size
"insert into test_tab values(:f1<float>,:f2<char[31]>)",
// SQL statement
db // connect object
);
char tmp[32];
for(int i=1;i<=100;++i){
sprintf(tmp,"Name%d",i);
o<<(float)i<<tmp;
}
}
void select()
{
<A HREF="otl3_stream_class.htm">otl_stream</A> i(50, // buffer size
"begin "
" open <B>:cur1</B> for "
" select * from test_tab "
" where f1>=:f<int> and f1<=:f*2; "
"end;", // SELECT statement via referenced cursor
db, // connect object
":cur1" // referenced cursor placeholder name
);
// create select stream
<A HREF="otl3_stream_class.htm#otl_column_desc">otl_column_desc</A>* desc;
int desc_len;
i<<4; // Before the child SELECT statement can be described,
// the PL/SQL master block needs to be executed.
// Forcing the execution of the blcok by entering its input
// patameter.
desc=i.<A HREF="otl3_stream_class.htm#describe_select">describe_select</A>(desc_len);
for(int n=0;n<desc_len;++n){
cout<<"========== COLUMN #"<<n+1<<" ==========="<<endl;
cout<<"name="<<desc[n].name<<endl;
cout<<"dbtype="<<desc[n].dbtype<<endl;
cout<<"<A HREF="otl3_stream_class.htm#otl_var_dbtype">otl_var_dbtype</A>="<<desc[n].otl_var_dbtype<<endl;
cout<<"dbsize="<<desc[n].dbsize<<endl;
cout<<"scale="<<desc[n].scale<<endl;
cout<<"prec="<<desc[n].prec<<endl;
cout<<"nullok="<<desc[n].nullok<<endl;
}
}
int main()
{
<A HREF="otl3_connect_class.htm">otl_connect::otl_initialize</A>(); // initialize OCI environment
try{
db.rlogon("scott/tiger"); // connect to Oracle
<A HREF="otl3_const_sql.htm">otl_cursor::direct_exec
</A> (
db,
"drop table test_tab",
otl_exception::disabled // disable OTL exceptions
); // drop table
<A HREF="otl3_const_sql.htm">otl_cursor::direct_exec
</A> (
db,
"create table test_tab(f1 number, f2 varchar2(30))"
); // create table
insert(); // insert record into table
select(); // select records from table
}
catch(<A HREF="otl3_exception_class.htm">otl_exception</A>& p){ // intercept OTL exceptions
cerr<<p.msg<<endl; // print out error message
cerr<<p.stm_text<<endl; // print out SQL that caused the error
cerr<<p.var_info<<endl; // print out the variable that caused the error
}
db.logoff(); // disconnect from Oracle
return 0;
}
</PRE>
<H2>Output</H2>
<PRE>========== COLUMN #1 ===========
name=F1
dbtype=2
otl_var_dbtype=2
dbsize=22
scale=0
prec=0
nullok=1
========== COLUMN #2 ===========
name=F2
dbtype=1
otl_var_dbtype=1
dbsize=30
scale=0
prec=0
nullok=1
<HR WIDTH="100%"></PRE>
<CENTER><P><A HREF="otl3_examples.htm">Examples</A> <A HREF="otl3.htm">Contents</A>
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<P>Copyright © 1996, 2008, Sergei Kuchin, email: <A HREF="mailto:skuchin@aceweb.com">skuchin@aceweb.com</A>,
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