OTL 4.0, Example 551
(Sybase SQL Server: otl_stream::describe_select() and result sets)

This example demonstrates the otl_stream::describe_select() with a stored procedure call returning a result set.

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<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
"{call my_proc(:f1<int>)}", // SELECT statement via stored procedure
db, // connect object
otl_implicit_select // implicit SELECT statement
);
// create select stream

otl_column_desc* desc;
int desc_len;

i<<4; // Before the child SELECT statement can be described,
// the stored procedure needs to be executed.
// Forcing the execution of the stored procedure 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 ODBC environment
try{

db.rlogon("scott/tigger@freetds_sybsql"); // connect to ODBC
// 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
otl_cursor::direct_exec(db,"drop procedure my_proc",0);
otl_cursor::direct_exec
(
db,
"CREATE PROCEDURE my_proc "
" @F1 int "
"AS "
"SELECT * FROM test_tab "
"WHERE f1>=@F1 AND f1<=@F1*2 "
); // create stored procedure

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.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

========== COLUMN #1 ===========
name=f1
dbtype=4
otl_var_dbtype=4
dbsize=10
scale=0
prec=10
nullok=1
========== COLUMN #2 ===========
name=f2
dbtype=12
otl_var_dbtype=1
dbsize=60
scale=0
prec=60
nullok=1

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

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