OTL 4.0, Example 739 (get_dirty_buf_len() with INSERT and SELECT)

This example demonstrates the use of otl_stream::get_dirty_buf_len() with INSERT and SELECT statements.

Source Code

#include <iostream>
using namespace std;

#include <stdio.h>

#define OTL_ODBC_MSSQL_2008 // Compile OTL 4.0/MSSQL2008 SNAC
#include <otlv4.h> // include the OTL 4.0 header file

otl_connect db; // connect object

void insert()
// insert rows into table
{ 
 otl_stream o(3, // buffer size
              "insert into test_tab values(:f1<int>,:f2<char[31]>)", 
                 // SQL statement
              db // connect object
             );
 char tmp[32];

 for(int i=1;i<=20;++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
  o<<i<<tmp;
  cout<<"get_dirty_buf_len(): "<<o.get_dirty_buf_len()<<endl;
 }
}

void select()
{ 
 otl_stream i(3, // buffer size
              "select * from test_tab where f1>=:f11<int> and f1<=:f12<int>*2",
                 // SELECT statement
              db // connect object
             ); 
   // create select stream
 
 int f1;
 char f2[31];

 cout<<"=========================================="<<endl;
 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
   cout<<"get_dirty_buf_len(): "<<i.get_dirty_buf_len()<<", ";
   i>>f1>>f2;
   cout<<"f1="<<f1<<", f2="<<f2<<endl;
 }
 cout<<"=========================================="<<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
   cout<<"get_dirty_buf_len(): "<<i.get_dirty_buf_len()<<", ";
   i>>f1>>f2;
   cout<<"f1="<<f1<<", f2="<<f2<<endl;
 }

}

int main()
{
 otl_connect::otl_initialize(); // initialize the database environment
 try{

  db.rlogon("scott/tiger@mssql2008"); // connect to the database

  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 int, f2 varchar(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 the database

 return 0;

}

Output

get_dirty_buf_len(): 1
get_dirty_buf_len(): 2
get_dirty_buf_len(): 0
get_dirty_buf_len(): 1
get_dirty_buf_len(): 2
get_dirty_buf_len(): 0
get_dirty_buf_len(): 1
get_dirty_buf_len(): 2
get_dirty_buf_len(): 0
get_dirty_buf_len(): 1
get_dirty_buf_len(): 2
get_dirty_buf_len(): 0
get_dirty_buf_len(): 1
get_dirty_buf_len(): 2
get_dirty_buf_len(): 0
get_dirty_buf_len(): 1
get_dirty_buf_len(): 2
get_dirty_buf_len(): 0
get_dirty_buf_len(): 1
get_dirty_buf_len(): 2
==========================================
get_dirty_buf_len(): 3, f1=8, f2=Name8
get_dirty_buf_len(): 2, f1=9, f2=Name9
get_dirty_buf_len(): 1, f1=10, f2=Name10
get_dirty_buf_len(): 3, f1=11, f2=Name11
get_dirty_buf_len(): 2, f1=12, f2=Name12
get_dirty_buf_len(): 1, f1=13, f2=Name13
get_dirty_buf_len(): 3, f1=14, f2=Name14
get_dirty_buf_len(): 2, f1=15, f2=Name15
get_dirty_buf_len(): 1, f1=16, f2=Name16
==========================================
get_dirty_buf_len(): 3, f1=4, f2=Name4
get_dirty_buf_len(): 2, f1=5, f2=Name5
get_dirty_buf_len(): 1, f1=6, f2=Name6
get_dirty_buf_len(): 2, f1=7, f2=Name7
get_dirty_buf_len(): 1, f1=8, f2=Name8

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