OTL 4.0, Example 255 (Explicit bind variables in SELECT statement column definitions, ODBC, MS SQL Server)

This example demonstrates how to use explicit bind variables in SELECT statement column definitions.

Source Code

#include <iostream>
using namespace std;
#include <stdio.h>
#define OTL_ODBC // 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]>,:f3<int>)",
// SQL statement
db // connect object
);
char tmp[32];

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

void select()
{
otl_stream i(50, // buffer size
"select f1 :#1<char[20]>, f2, f3 :#3<short> "
"from test_tab "
"where f1>=:f11<int> "
" and f1<=:f12<int>*2",
// SELECT statement
db // connect object
);
// create select stream

char f1[20];
char f2[31];
short int f3;

i<<4<<4; // assigning :f11 = 8, :f12 = 8
// 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>>f3;
cout<<"f1='"<<f1<<"', f2="<<f2<<", f3="<<f3<<endl;
}

}

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

db.rlogon("scott/tiger@mssql"); // connect to the database

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), f3 int)"
); // 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=Name4, f3=4
f1='5', f2=Name5, f3=5
f1='6', f2=Name6, f3=6
f1='7', f2=Name7, f3=7
f1='8', f2=Name8, f3=8

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Copyright © 1996, 2007, Sergei Kuchin, email: skuchin@ispwest.com, skuchin@gmail.com/a>.

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.