OTL 4.0, Example 64
(otl_stream::describe_select() with a referenced cursor for Oracle8i)

Example 64 (otl_stream::describe_select() with a referenced cursor for Oracle 8i)

This example demonstrates the otl_stream::describe_select() with a referenced cursor for Oracle 8i. The implementations of both describe_select() and referenced cursors for Oracle 8i require a slightly different use of OCI8 as compared to the use of OCI8 for Oracle 8. Therefore, a new #define was introduced: OTL_ORA8I

Source Code

#include <iostream>
using namespace std;

#include <stdio.h>
#define OTL_ORA8I // Compile OTL 4.0/OCI8 in the Oracle 8i environment
#include <otlv4.h> // include the OTL 4.0 header file

otl_connect db; // connect object
void insert()
// insert rows into table
{ 
 otl_stream o(50, // buffer size
              "insert into test_tab values(:f1<float>,:f2<char[31]>)", 
                 // SQL statement
              db // connect object
             );
 char tmp[32];

 for(int i=1;i<=100;++i){
  sprintf(tmp,"Name%d",i);
  o<<(float)i<<tmp;
 }
}

void select()
{ 
 otl_stream i(50, // buffer size
              "begin "
              "  open :cur1 for "
              "   select * from test_tab "
              "   where f1>=:f<int> and f1<=:f*2; "
              "end;", // SELECT statement via referenced cursor
              db, // connect object
              ":cur1" // referenced cursor placeholder name
             ); 
   // create select stream
 
 otl_column_desc* desc;
 int desc_len;

 i<<4; // Before the child SELECT statement can be described,
       // the PL/SQL master block needs to be executed.
       // Forcing the execution of the blcok by entering its input 
       // patameter.

 desc=i.describe_select(desc_len);

 for(int n=0;n<desc_len;++n){
  cout<<"========== COLUMN #"<<n+1<<" ==========="<<endl;
  cout<<"name="<<desc[n].name<<endl;
  cout<<"dbtype="<<desc[n].dbtype<<endl;
  cout<<"otl_var_dbtype="<<desc[n].otl_var_dbtype<<endl;
  cout<<"dbsize="<<desc[n].dbsize<<endl;
  cout<<"scale="<<desc[n].scale<<endl;
  cout<<"prec="<<desc[n].prec<<endl;
  cout<<"nullok="<<desc[n].nullok<<endl;
 }
 

}

int main()
{
 otl_connect::otl_initialize(); // initialize OCI 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 varchar2(30))"
    );  // create table

  insert(); // insert record 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 Oracle

 return 0;

}

Output

========== COLUMN #1 ===========
name=F1
dbtype=2
otl_var_dbtype=2
dbsize=22
scale=0
prec=0
nullok=1
========== COLUMN #2 ===========
name=F2
dbtype=1
otl_var_dbtype=1
dbsize=30
scale=0
prec=0
nullok=1





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.