OTL 4.0, Example 721 (Oracle 10.2 and higher, char[XXX] and LONGs, combined with the bulk interface (stream buffer size>1))

This example demonstrates INSERT and SELECT statements with the char[XXX] bind variable data type and LONGs, combined with the bulk interface (stream buffer size >1).

Source Code

#include <iostream>
using namespace std;

#include <stdio.h>
#define OTL_ORA7 // Compile OTL 4.0/OCI7
#include <otlv4.h> // include the OTL 4.0 header file

otl_connect db; // connect object

void insert()
// insert rows into table
{
otl_stream o(10, // buffer size
"insert into test_tab values(:f1<int>,:f2<char[200001]>)",
// SQL statement
db // connect object
);
char f2[200001];
for(int i=1;i<=20;++i){
for(int j=0;j<199999;++j)
f2[j]='*';
f2[199999]='?';
f2[200000]=0;
o<<i<<f2;
}

}

void select()
{
otl_stream i(10, // buffer size
"select f1, f2 :#2<char[200001]> from test_tab "
// override f2's default data type "LONG" with char[XXX] so that the bulk interface
// can be used efficiently
"where f1>=:f11<int> and f1<=:f12<int>*2",
// SELECT statement
db // connect object
);
// create select stream

int f1;
char f2[200001];

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
i>>f1>>f2;
cout<<"f1="<<f1<<", f2="<<f2[0]<<f2[strlen(f2)-1]<<", len="<<strlen(f2)<<endl;
}

}

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

db.rlogon("scott/tiger"); // connect to Oracle

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 number, f2 long)"
); // 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=4, f2=*?, len=200000
f1=5, f2=*?, len=200000
f1=6, f2=*?, len=200000
f1=7, f2=*?, len=200000
f1=8, f2=*?, len=200000

Examples Contents Go Home

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.