ex285_oci8.cpp

there are OTL exampless,it s a good examples

#include <iostream>
using namespace std;

#include <stdio.h>

#define OTL_ORA8I // Compile OTL 4.0/OCI8i
//#define OTL_ORA9I // Compile OTL 4.0/OCI9i
//#define OTL_ORA10G // Compile OTL 4.0/OCI10g
#define OTL_UNICODE // Enable Unicode OTL for OCI8i
#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<int>,:f2<char[31]>,:f3<nchar[31]>)", 
                 // SQL statement
              db // connect object
             );
 char tmp[32];
 unsigned short tmp2[31]; // Null terminated Unicode character array.

 for(int i=1;i<=100;++i){
#if defined(_MSC_VER)
#if (_MSC_VER >= 1400) // VC++ 8.0 or higher
  sprintf_s(tmp,sizeof(tmp),"Name%d",i);
#else
  sprintf(tmp,"Name%d",i);
#endif
#else
  sprintf(tmp,"Name%d",i);
#endif
  unsigned short* c2=tmp2;
  char* c1=tmp;
// Unicode's first 128 characters are ASCII (0..127), so
// all is needed for converting ASCII into Unicode is as follows:
  while(*c1){
    *c2=OTL_SCAST(unsigned char,*c1);
   ++c1; ++c2;   
  }  
  *c2=0; // target Unicode string is null terminated,
         // only the null terminator is a two-byte character, 
         // not one-byte
  o<<i;
  o<<reinterpret_cast<unsigned char*>(tmp2); 
   // overloaded operator<<(const unsigned char*) in the case of Unicode
   // OTL accepts a pointer to a Unicode character array.
   // operator<<(const unsigned short*) wasn't overloaded
   // in order to avoid ambiguity in C++ type casting.
  o<<reinterpret_cast<unsigned char*>(tmp2); 
 }

}

void select()
{ 
 otl_stream i(50, // buffer size
              "select "
               "  f1, f2, "
               "  f3 :#3<nchar[31]> " 
                 // override the default mapping of f3 (from char[]) 
                 // to nchar[]
              "from test_tab "
              "where f1>=:f<int> "
              "  and f1<=:f*2",
                 // SELECT statement
              db // connect object
             ); 
   // create select stream
 
 int f1;
 unsigned short f2[31];
 unsigned short f3[31];

 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;
  i>>reinterpret_cast<unsigned char*>(f2);
    // overloaded operator>>(unsigned char*) in the case of Unicode
    // OTL accepts a pointer to a Unicode chracter array.
    // operator>>(unsigned short*) wasn't overloaded 
    // in order to avoid ambiguity in C++ type casting.
  i>>reinterpret_cast<unsigned char*>(f3);
  cout<<"f1="<<f1<<", f2=";
// Unicode's first 128 characters are ASCII, so in order
// to convert Unicode back to ASCII all is needed is
// as follows:
   for(int j=0;f2[j]!=0;++j){
     cout<<static_cast<char>(f2[j]);
   }
   cout<<", f3=";
   for(int j2=0;f3[j2]!=0;++j2){
     cout<<static_cast<char>(f2[j2]);
   }
   cout<<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(60), f3 nvarchar2(60))"
    );  // 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;

}