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<TITLE>OTL 4.0, Example 66 (Simple Insert/Select and otl_stream::clean() function for Oracle 8/8i)</TITLE>
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<H1 ALIGN=CENTER>OTL 4.0, Example 66 (Simple Insert/Select and otl_stream::clean()
function for Oracle 8/8i)</H1>
<H1>Example 66 (Simple Insert/Select and otl_stream::clean() function for
Oracle 8/8i)</H1>
<P>This example demonstrates simple INSERT, SELECT and the use of the <A HREF="otl3_stream_class.htm#clean">otl_stream::clean</A>()
function for Oracle 8/8i.</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
void insert()
// insert rows into table
{
<A HREF="otl3_stream_class.htm">otl_stream</A> o(10, // buffer size
"insert into test_tab values(:f1<int>,:f2<char[31]>)",
// SQL statement
db // connect object
);
o.<A HREF="otl3_stream_class.htm#set_commit">set_commit</A>(0); // set stream's auto-commit to OFF.
try{
o<<1<<"Line1"; // Enter one row into the stream
o.<A HREF="otl3_stream_class.htm#flush">flush</A>(); // flush the strem buffer, i.e. force
// the stream to execute
o<<1<<"Line1"; // Enter the same data into the stream
// and cause a "duplicate key" error.
o.<A HREF="otl3_stream_class.htm#flush">flush</A>();
}catch(<A HREF="otl3_exception_class.htm">otl_exception</A>& p){
if(p.code==1){
// ORA-0001: ... duplicate key ...
o.<A HREF="otl3_stream_class.htm#clean">clean</A>(1); // clean up the stream's buffer
// and clean up thestream's internal
// error flag as well. By doing this,
// it's possible to recover from
// a database error without closing
// the stream. Remember, the number of
// situtation when it's possible is
// limited and the recover procedure should
// be carefully designed.
}else
throw; // re-throw the exception to the outer catch block.
}
o<<2<<"Line2"; // Enter one more row of data after
// recovering from the "duplicate key"
// error
o.flush();
db.<A HREF="otl3_connect_class.htm#commit">commit</A>(); // commit transaction
}
void select()
{
<A HREF="otl3_stream_class.htm">otl_stream</A> i(10, // buffer size
"select * from test_tab",
// SELECT statement
db // connect object
);
// create select stream
int f1;
char f2[31];
while(!i.eof()){ // while not end-of-data
i>>f1>>f2;
cout<<"f1="<<f1<<", f2="<<f2<<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
<A HREF="otl3_const_sql.htm">otl_cursor::direct_exec
</A> (
db,
"create unique index ind001 on test_tab(f1)"
); // create unique index
insert(); // insert records 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>f1=1, f2=Line1
f1=2, f2=Line2
<HR WIDTH="100%"></PRE>
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