OTL 4.0, Example 214 (OTL_ADD_NULL_TERMINATOR_TO_STRING_SIZE,

PostgreSQL)

Example 214 (OTL_ADD_NULL_TERMINATOR_TO_STRING_SIZE,

PostgreSQL)

This example demonstrates a simple INSERT, SELECT, constant SQL statements, and #define
OTL_ADD_NULL_TERMINATOR_TO_STRING_SIZE..

Source Code

#include <iostream>
using namespace std;

#include <stdio.h>

// #define OTL_ODBC_UNIX // uncomment this line if UnixODBC is used
#define OTL_ODBC_ALTERNATE_RPC
#if !defined(_WIN32) && !defined(_WIN64)
#define OTL_ODBC
#else 
#define OTL_ODBC_POSTGRESQL // required with PG ODBC on Windows
#endif

#define OTL_ADD_NULL_TERMINATOR_TO_STRING_SIZE
#include <otlv4.h> // include the OTL 4.0 header file

otl_connect db; // connect object

void insert()
// insert rows into table
{ 
 otl_stream o(1, // PostgreSQL 8.1 and higher, the buffer can be > 1
              "insert into test_tab values(:f1<int>,:f2<char[2]>)", 
                 // SQL statement
              db // connect object
             );

 for(int i=1;i<=100;++i){
  o<<i<<"AB";
 }
}

void select()
{ 
 otl_stream i(50, // buffer size
              "select * from test_tab where f1>=:f<int> and f1<=:ff<int>*2",
                 // SELECT statement
              db // connect object
             ); 
   // create select stream
 
 float f1;
 char f2[31];

 i<<8<<8; // assigning :f = 8; :ff = 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<<4; // assigning :f = 4, :ff = 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 ODBC environment
 try{

  db.rlogon("scott/tiger@postgresql"); // connect to ODBC

  otl_cursor::direct_exec
   (
    db,
    "drop table test_tab",
    otl_exception::disabled // disable OTL exceptions
   ); // drop table
   db.commit();
  otl_cursor::direct_exec
   (
    db,
    "create table test_tab(f1 int, f2 varchar(2))"
    );  // create table
   db.commit();
  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.sqlstate<<endl; // print out SQLSTATE message
  cerr<<p.var_info<<endl; // print out the variable that caused the error
 }

 db.logoff(); // disconnect from Oracle

 return 0;

}

Output

f1=8, f2=AB
f1=9, f2=AB
f1=10, f2=AB
f1=11, f2=AB
f1=12, f2=AB
f1=13, f2=AB
f1=14, f2=AB
f1=15, f2=AB
f1=16, f2=AB
f1=4, f2=AB
f1=5, f2=AB
f1=6, f2=AB
f1=7, f2=AB
f1=8, f2=AB

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