OTL 4.0, Example 560 (Describe otl_stream's bind variables for Sybase SQL Server)

This example demonstrates a group of bind variable describe functions for Sybase SQL Server.

Source Code

#include <iostream>
using namespace std;

#include <stdio.h>
#define OTL_ODBC_UNIX // Compile OTL 4.0/ODBC
#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<int>,:f2<char[31]>)", 
                 // SQL statement
              db // connect object
             );
 int i,j;
 char tmp[32];

 otl_var_desc* vdesc;
 int vdesc_len;

 vdesc=o.describe_in_vars(vdesc_len);
 for(j=0;j<vdesc_len;++j){
  cout<<"IN VAR =========================>"<<j<<endl;
  cout<<"param_type="<<vdesc[j].param_type<<endl;
  cout<<"ftype="<<vdesc[j].ftype<<endl;
  cout<<"elem_size="<<vdesc[j].elem_size<<endl;
  cout<<"array_size="<<vdesc[j].array_size<<endl;
  cout<<"pos="<<vdesc[j].pos<<endl;
  cout<<"name_pos="<<vdesc[j].name_pos<<endl;
  cout<<"name="<<vdesc[j].name<<endl;
  cout<<"pl_tab_flag="<<vdesc[j].pl_tab_flag<<endl;
 }
 cout<<endl<<"Inserting rows into table..."<<endl;
 for(i=1;i<=5;++i){
  sprintf(tmp,"Name%d",i);
  cout<<"============= Inserting ========>"<<i<<endl;
  vdesc=o.describe_next_in_var();
  cout<<"ftype="<<vdesc->ftype<<", name="<<vdesc->name<<", f1="<<i<<endl;
  o<<i;
  vdesc=o.describe_next_in_var();
  cout<<"ftype="<<vdesc->ftype<<", name="<<vdesc->name<<", f2="<<tmp<<endl;
  o<<tmp;
 }

}

void select()

 otl_stream i(50, // buffer size
              "select * from test_tab where f1>=:f<int> and f1<=:ff<int>*2",
                 // SELECT statement
              db // connect object
             ); 
   // create select stream
 
 int j;
 int f1;
 char f2[31];

 otl_var_desc* vdesc;
 int vdesc_len;

 vdesc=i.describe_in_vars(vdesc_len);
 for(j=0;j<vdesc_len;++j){
  cout<<"IN VAR =========================>"<<j<<endl;
  cout<<"param_type="<<vdesc[j].param_type<<endl;
  cout<<"ftype="<<vdesc[j].ftype<<endl;
  cout<<"elem_size="<<vdesc[j].elem_size<<endl;
  cout<<"array_size="<<vdesc[j].array_size<<endl;
  cout<<"pos="<<vdesc[j].pos<<endl;
  cout<<"name_pos="<<vdesc[j].name_pos<<endl;
  cout<<"name="<<vdesc[j].name<<endl;
  cout<<"pl_tab_flag="<<vdesc[j].pl_tab_flag<<endl;
 }

 vdesc=i.describe_out_vars(vdesc_len);
 for(j=0;j<vdesc_len;++j){
  cout<<"OUT VAR =========================>"<<j<<endl;
  cout<<"param_type="<<vdesc[j].param_type<<endl;
  cout<<"ftype="<<vdesc[j].ftype<<endl;
  cout<<"elem_size="<<vdesc[j].elem_size<<endl;
  cout<<"array_size="<<vdesc[j].array_size<<endl;
  cout<<"pos="<<vdesc[j].pos<<endl;
  cout<<"name_pos="<<vdesc[j].name_pos<<endl;
  cout<<"name="<<vdesc[j].name<<endl;
  cout<<"pl_tab_flag="<<vdesc[j].pl_tab_flag<<endl;
 }

 cout<<endl<<"Selecting rows from table..."<<endl;
 i<<2<<2; // assigning :f = 4, :ff = 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
  cout<<"======== Selecting a row ========>"<<endl;
  vdesc=i.describe_next_out_var();
  cout<<"ftype="<<vdesc->ftype<<", pos="<<vdesc->pos;
  i>>f1;
  cout<<", f1="<<f1<<endl;
  vdesc=i.describe_next_out_var();
  cout<<"ftype="<<vdesc->ftype<<", pos="<<vdesc->pos;
  i>>f2;
  cout<<", f2="<<f2<<endl;
 }

}

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

  db.rlogon("scott/tigger@freetds_sybsql"); // connect to the database
// It's recommended to use auto_commit_off() when OTL is used
// with FreeTDS/ODBC against Sybase in order to set the DB
// session's auto-commit to OFF. otl_connect::rlogon()'s auto-commit
// parameter has not effect. auto_commit_off() is a workaround, until
// a fix becomes available.
db.auto_commit_off();

  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.sqlstate<<endl; // print out SQLSTATE message
  cerr<<p.var_info<<endl; // print out the variable that caused the error
 }

 db.logoff(); // disconnect from teh database

 return 0;

}

Output

IN VAR =========================>0
param_type=0
ftype=4
elem_size=4
array_size=50
pos=0
name_pos=1
name=:f1
pl_tab_flag=0
IN VAR =========================>1
param_type=0
ftype=1
elem_size=31
array_size=50
pos=0
name_pos=2
name=:f2
pl_tab_flag=0

Inserting rows into table...
============= Inserting ========>1
ftype=4, name=:f1, f1=1
ftype=1, name=:f2, f2=Name1
============= Inserting ========>2
ftype=4, name=:f1, f1=2
ftype=1, name=:f2, f2=Name2
============= Inserting ========>3
ftype=4, name=:f1, f1=3
ftype=1, name=:f2, f2=Name3
============= Inserting ========>4
ftype=4, name=:f1, f1=4
ftype=1, name=:f2, f2=Name4
============= Inserting ========>5
ftype=4, name=:f1, f1=5
ftype=1, name=:f2, f2=Name5
IN VAR =========================>0
param_type=0
ftype=4
elem_size=4
array_size=1
pos=0
name_pos=1
name=:f
pl_tab_flag=0
IN VAR =========================>1
param_type=0
ftype=4
elem_size=4
array_size=1
pos=0
name_pos=2
name=:ff
pl_tab_flag=0
OUT VAR =========================>0
param_type=1
ftype=4
elem_size=4
array_size=50
pos=1
name_pos=0
name=f1
pl_tab_flag=0
OUT VAR =========================>1
param_type=1
ftype=1
elem_size=61
array_size=50
pos=2
name_pos=0
name=f2
pl_tab_flag=0

Selecting rows from table...
======== Selecting a row ========>
ftype=4, pos=1, f1=2
ftype=1, pos=2, f2=Name2
======== Selecting a row ========>
ftype=4, pos=1, f1=3
ftype=1, pos=2, f2=Name3
======== Selecting a row ========>
ftype=4, pos=1, f1=4
ftype=1, pos=2, f2=Name4


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

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