Example 54 (Datatype override in SELECT, Oracle 8)

Source Code

#include <iostream>
using namespace std;

#include <stdio.h>

#define OTL_ORA8 // Compile OTL 4.0/OCI8
#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(12345678900000000+:f1<int>,:f2<char[31]>)", 
                 // SQL statement
              db // connect object
             );
 char tmp[32];

 for(int i=1;i<=100;++i){
  sprintf(tmp,"Name%d",i);
  o<<i<<tmp;
 }
}

void select()
{ 
 otl_stream i;

 i.set_column_type(1,otl_var_char,40); // use a string(40) instead of default double
 i.open(50, // buffer size
        "select * from test_tab "
        "where f1>=12345678900000000+:f<int> "
        "  and f1<=12345678900000000+:f*2",
           // SELECT statement
        db // connect object
       ); 
   // create select stream
 
 char f1[40];
 char f2[31];

 i<<8; // assigning :f = 8
   // SELECT automatically executes when all input variables are
   // assigned. First portion of output rows is fetched to the buffer

 while(!i.eof()){ // while not end-of-data
  i>>f1>>f2;
  cout<<"f1="<<f1<<", f2="<<f2<<endl;
 }

 i<<4; // assigning :f = 4
   // SELECT automatically executes when all input variables are
   // assigned. First portion of output rows is fetched to the buffer

 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

  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

f1=12345678900000008, f2=Name8
f1=12345678900000009, f2=Name9
f1=12345678900000010, f2=Name10
f1=12345678900000011, f2=Name11
f1=12345678900000012, f2=Name12
f1=12345678900000013, f2=Name13
f1=12345678900000014, f2=Name14
f1=12345678900000015, f2=Name15
f1=12345678900000016, f2=Name16
f1=12345678900000004, f2=Name4
f1=12345678900000005, f2=Name5
f1=12345678900000006, f2=Name6
f1=12345678900000007, f2=Name7
f1=12345678900000008, f2=Name8

Copyright © 1996, 2007, Sergei Kuchin, email: skuchin@ispwest.com, skuchin@gmail.com/a>.