OTL 4.0, Example 156 (OTL/OCI8/9, otl_connect::cancel())

Example 156 (OTL/OCI8/9, otl_connect::cancel())

This example demonstrates how to use otl_connect::cancel() in OTL/OCI8, OTL/OCI9. The example works in Windows, VC++, only. With small modifications, the example can be ported to Unix, pthreads.

Source Code

#include <iostream>
using namespace std;

#include <stdio.h>
#include <windows.h>
#include <process.h>

#define OTL_ORA8 // Compile OTL 4.0/OCI8
//#define OTL_ORA8I // Compile OTL 4.0/OCI8(i)
// #define OTL_ORA9I // Compile OTL 4.0/OCI9(i)
#include <otlv4.h> // include the OTL 4.0 header file

otl_connect db; // connect object

void insert()
// insert rows into table
{ 
 otl_stream 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(void* dummy_par)
{ 
 try{
  otl_stream i;

  i.open(50, // buffer size
         "select count(*) "
         "from test_tab a1, test_tab a2, test_tab a3, "
         "     test_tab a4, test_tab a5",
           // SELECT statement
         db // connect object
        ); 
   // create select stream
 
  int count;

  while(!i.eof()){ // while not end-of-data
   i>>count;
   cout<<"count="<<count<<endl;
  }
 }catch(otl_exception& p){
  cerr<<"Select() ===> "<<p.msg<<endl; // print out error message
  cerr<<"Select() ===> "<<p.stm_text<<endl; // print out SQL that caused the error
  cerr<<"Select() ===> "<<p.var_info<<endl; // print out the vari }
 }
 _endthread();
}

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

  insert(); // insert records into table
  _beginthread(select,0,NULL);
  Sleep(1000);
  cout<<"Cancel the SQL"<<endl;
  db.cancel();
  cout<<"Done"<<endl;
  Sleep(1000);
 }

 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

Cancel the SQL
Done
Select() ===> ORA-01013: user requested cancel of current operation

Select() ===> select count(*) from test_tab a1, test_tab a2, test_tab a3,      test_tab a4, test_tab a5
Select() ===>

Examples Contents Go Home

Permission to use, copy, modify and redistribute this document for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies.