OTL 4.0, Example 229 (otl_long_string container and LONGBLOB column, MyODBC 3.50)

Example 229 (otl_long_string container and LONBLOB column, MyODBC 3.50)

This example demonstrates simple INSERT/SELECT with otl_long_string container and LONGBLOB column. TINYBLOB, BLOB, MEDIUMBLOB can be used in this example as well.

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

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<raw_long>), "
"(:f12<int>,:f22<raw_long>), "
"(:f13<int>,:f23<raw_long>), "
"(:f14<int>,:f24<raw_long>), "
"(:f15<int>,:f25<raw_long>) ",
// INSERT statement. Multiple sets of values can be used
// to work around the lack of the bulk interface
              db // connect object
             );
// If the number of rows to be inserted is not known in advance,
// another stream with the same INSERT can be opened
otl_stream o2(1, // buffer size needs to be set to 1
"insert into test_tab values "
"(:f1<int>,:f2<raw_long>)",
// INSERT statement
db // connect object
);
int i,j;
 for(i=1;i<=10;++i){
  for(j=0;j<5000;++j)
   f2[j]='*';
  f2[5000]='?';
  f2.set_len(5001);
  o<<i<<f2;
 }
 for(i=11;i<=103;++i){
  for(j=0;j<5000;++j)
   f2[j]='*';
  f2[5000]='?';
  f2.set_len(5001);
  o2<<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 BLOB 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("UID=scott;PWD=tiger;DSN=mysql35"); // connect to ODBC

  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 longblob) type=innoDB"
    );  // 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
f1=11, f2=*?, len=5001
f1=12, f2=*?, len=5001
f1=13, f2=*?, len=5001

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

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