OTL 4.0, Example 280 (otl_long_string container and a TEXT column)

This example demonstrates simple INSERT/SELECT with otl_long_string container and a TEXT column.

Source Code

#include <iostream>
using namespace std;

#include <stdio.h>

#define OTL_ODBC // Compile OTL 4.0/ODBC
#define ODBCVER 0x0250 // ODBC Version # needs to be downgraded
                       // to 2.5 because the SQLite ODBC driver seems
                       // to run slower when ODBC 3.x functions
                       // used (performance is not as good as with
                       // ODBC 2.5 function calls)
// #define OTL_ODBC_UNIX // uncomment this line if UnixODBC is used
#include <otlv4.h> // include the OTL 4.0 header file

otl_connect db; // connect object

void insert(void)
// insert rows into table
{ 

 otl_long_string f2(7000); // define long string variable
 db.set_max_long_size(7000); // set maximum long string size for connect object

 otl_stream 
   o(1, // buffer size needs to be set to 1
     "insert into test_tab values(:f1<int>,:f2<varchar_long>)", 
        // INSERT statement
      db // connect object
     );

 for(int i=1;i<=10;++i){
  for(int j=0;j<5000;++j)
   f2[j]='*';
  f2[5000]='?';
  f2.set_len(5001);
  o<<i<<f2;
 }
}

void select(void)
{ 
 otl_long_string f2(7000); // define long string variable
 db.set_max_long_size(7000); // set maximum long string size for connect object

 otl_stream i(1, // buffer size needs to be set to 1 in case of TEXT columns
              "select * from test_tab",
                 // SELECT statement
              db // connect object
             ); 
   // create select stream
 
 int f1;


 while(!i.eof()){ // while not end-of-data
  i>>f1>>f2;
  cout<<"f1="<<f1<<", f2="<<f2[0]<<f2[f2.len()-1]<<", len="<<f2.len()<<endl;
 }

}

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

  db.rlogon("scott/tiger@sqlite");

  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 text)"
    );  // 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.sqlstate<<endl; // print out SQLSTATE message
  cerr<<p.var_info<<endl; // print out the variable that caused the error
 }

 db.logoff(); // disconnect from ODBC

 return 0;

}

Output

f1=1, f2=*?, len=5001
f1=2, f2=*?, len=5001
f1=3, f2=*?, len=5001
f1=4, f2=*?, len=5001
f1=5, f2=*?, len=5001
f1=6, f2=*?, len=5001
f1=7, f2=*?, len=5001
f1=8, f2=*?, len=5001
f1=9, f2=*?, len=5001
f1=10, f2=*?, len=5001

Examples Contents Go Home

Permission to use, copy, modify and redistribute this document for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies.