ex651_odbc.cpp

otl编程的举例

#include <iostream>
using namespace std;
#include <stdio.h>

// Compile OTL 4.0/ODBC in Windows. Informix CLI uses the  
// regular ODBC header files in Windows
#define OTL_ODBC 

// Uncomment the #defines below in Linux / Unix
//#define OTL_ODBC_UNIX
//#define OTL_INFORMIX_CLI
#include <otlv4.h> // include the OTL 4.0 header file


otl_connect db; // connect object

void select()
{ 
 otl_stream i(50, // buffer size
              "select * from test_tabxxx where f1>=:f11<int> and f1<=:f12<int>*2",
                 // SELECT statement
              db, // connect object
              otl_explicit_select, // this parameter has the default value of "explicit select",
                                   // yet it has to be specified because of the next parameter
              "SQL Stm #1" // SQL statement label.
             ); 
   // create select stream
 
 float f1;
 char f2[31];

 i<<8<<8; // assigning :f11 = 8, :f12 = 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 :f11 = 4, :f12 = 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 Informix CLI environment
 try{

  db.rlogon("informix/tigger@informixsql"); // connect to Informix

  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 Informix

 return 0;

}