OTL 4.0, Example 65 (Simple Insert/Select and otl_stream::clean() function for Oracle 7)

Example 65 (Simple Insert/Select and otl_stream::clean() function for Oracle 7)

This example demonstrates simple INSERT, SELECT and the use of the otl_stream::clean() function for Oracle 7.

Source Code

#include <iostream>
using namespace std;

#include <stdio.h>
#define OTL_ORA7 // Compile OTL 4.0/OCI7
#include <otlv4.h> // include the OTL 4.0 header file

otl_connect db; // connect object

void insert()
// insert rows into table
{ 
 otl_stream o(10, // buffer size
              "insert into test_tab values(:f1<int>,:f2<char[31]>)", 
                 // SQL statement
              db // connect object
             );

 o.set_commit(0); // set stream's auto-commit to OFF.

 try{
  o<<1<<"Line1"; // Enter one row into the stream
  o.flush(); // 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.flush();
 }catch(otl_exception& p){
  if(p.code==1){
   // ORA-0001: ... duplicate key ...
cout<<"STREAM ERROR STATE="<<o.get_error_state()<<endl; o.clean(1); // clean up the stream's buffer // and clean up the stream'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 recovery 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.commit(); // commit transaction } void select() { otl_stream 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() { otl_connect::otl_initialize(); // initialize OCI environment try{ db.rlogon("scott/tiger"); // connect to Oracle otl_cursor::direct_exec ( db, "drop table test_tab", otl_exception::disabled // disable OTL exceptions ); // drop table otl_cursor::direct_exec ( db, "create table test_tab(f1 number, f2 varchar2(30))" ); // create table otl_cursor::direct_exec ( db, "create unique index ind001 on test_tab(f1)" ); // create unique index insert(); // insert records into table select(); // select records from table } catch(otl_exception& 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; }

Output

STREAM ERROR STATE=1
f1=1, f2=Line1 f1=2, f2=Line2

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Copyright © 1996-2017, Sergei Kuchin, email: skuchin@gmail.com, skuchin@gmail.com.

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