OTL 4.0, Example 759 (UTF-8 client encoding: Insert/Select)

This example demonstrates a simple UTF8 INSERT, SELECT and constant SQL statements.

Source Code

#include <iostream>
using namespace std;

#include <stdio.h>
#define OTL_ODBC // Compile OTL 4.0/ODBC
// The following #define is required with MyODBC 3.51.11 and higher
#define OTL_ODBC_SELECT_STM_EXECUTE_BEFORE_DESCRIBE
// #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

// Sample UTF8 based string
unsigned char utf8_sample[]=
{0x61,0x62,0x63,0xd0,0x9e,0xd0,0x9b,0xd0,
0xac,0xd0,0x93,0xd0,0x90,0x0};

void insert()
// insert rows into table

 otl_stream o(1, // buffer size
              "insert into test_tab values(:f1<int>,:f2<char[31]>)", 
                 // SQL statement
              db // connect object
             );

 unsigned char tmp[31];

 for(int i=1;i<=100;++i){
#if defined(_MSC_VER)
#if (_MSC_VER >= 1400) // VC++ 8.0 or higher
strcpy_s(reinterpret_cast<char*>(tmp),
sizeof(tmp),
reinterpret_cast<const char*>(utf8_sample));
#else
strcpy(reinterpret_cast<char*>(tmp),reinterpret_cast<const char*>(utf8_sample));
#endif
#else
strcpy(reinterpret_cast<char*>(tmp),reinterpret_cast<const char*>(utf8_sample));
#endif
  o<<i;
  o<<tmp;
 }

}

void select()

 otl_stream i(50, // 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;
 unsigned 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;
  i>>f2;
  cout<<"f1="<<f1<<", f2=";
  for(int j=0;f2[j]!=0;++j)
printf("%2x ", f2[j]);
  cout<<endl;
 }

}

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

db.rlogon("UID=scott;PWD=tiger;DSN=mysql35;CHARSET=utf8"); // 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

f1=8, f2=61 62 63 d0 9e d0 9b d0 ac d0 93 d0 90
f1=9, f2=61 62 63 d0 9e d0 9b d0 ac d0 93 d0 90
f1=10, f2=61 62 63 d0 9e d0 9b d0 ac d0 93 d0 90
f1=11, f2=61 62 63 d0 9e d0 9b d0 ac d0 93 d0 90
f1=12, f2=61 62 63 d0 9e d0 9b d0 ac d0 93 d0 90
f1=13, f2=61 62 63 d0 9e d0 9b d0 ac d0 93 d0 90
f1=14, f2=61 62 63 d0 9e d0 9b d0 ac d0 93 d0 90
f1=15, f2=61 62 63 d0 9e d0 9b d0 ac d0 93 d0 90
f1=16, f2=61 62 63 d0 9e d0 9b d0 ac d0 93 d0 90


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Copyright 1996-2017, Sergei Kuchin, email: skuchin@gmail.com, skuchin@gmail.com .

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. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.