OTL 4.0, Example 93 (otl_long_string container and BLOB column)

Example 93 (otl_long_string container and BLOB column)

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

Source Code

#include <iostream>
using namespace std;

#include <stdio.h>

#define OTL_DB2_CLI // Compile OTL 4.0/DB2-CLI
#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(70000); // define long string variable
 db.set_max_long_size(70000); // 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>)", 
                 // INSERT statement
              db // connect object
             );


 for(int i=1;i<=10;++i){
  for(int j=0;j<50000;++j)
   f2[j]='*';
  f2[50000]='?';
  f2.set_len(50001);
  o<<i<<f2;
 }
}

void select(void)
{ 
 otl_long_string f2(70000); // define long string variable
 db.set_max_long_size(70000); // set maximum long string size for connect object

 otl_stream i(1, // buffer size needs to be set to 1 in case of CLOB 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 DB2 CLI environment
 try{

  db.rlogon("UID=scott;PWD=tiger;DSN=db2sql"); // connect to DB2

  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 blob(2M))"
    );  // 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 DB2

 return 0;

}

Output

f1=1, f2=*?, len=50001
f1=2, f2=*?, len=50001
f1=3, f2=*?, len=50001
f1=4, f2=*?, len=50001
f1=5, f2=*?, len=50001
f1=6, f2=*?, len=50001
f1=7, f2=*?, len=50001
f1=8, f2=*?, len=50001
f1=9, f2=*?, len=50001
f1=10, f2=*?, len=50001

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. 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.