This example demonstrates simple INSERT and SELECT statements with the VARBINARY datatype as well as constant SQL statements.
#include <iostream>
using namespace std;
#include <stdio.h>
#define OTL_ODBC // Compile OTL 4.0/ODBC
// The following #define is required with MyODBC 3.51.11 and higher
#define OTL_ODBC_SELECT_STM_EXECUTE_BEFORE_DESCRIBE
#include <otlv4.h> // include the OTL 4.0 header file
otl_connect db; // connect object
void insert()
// insert rows into table
{
otl_long_string f2(700); // define long string variable
otl_stream o(1, // buffer size still has to be set to 1 on INSERT
"insert into test_tab values(:f1<int>,:f2<raw[700]>)",
// SQL statement
db // connect object
);
for(int i=1;i<=20;++i){
for(int j=0;j<699;++j)
f2[j]='*';
f2[699]='?';
f2.set_len(700);
o<<i<<f2;
}
}
void select()
{
otl_long_string f2(700); // define long string variable
otl_stream i(10, // buffer size
"select f1, "
// MyODBC does not return SQL_VARBINARY, so the output column type
// has to be overriden explicitly
" f2 :#2<raw[700]> "
"from test_tab "
"where f1>=:f11<int> and f1<=:f12<int>*2",
// SELECT statement
db // connect object
);
// create select stream
float f1;
i<<8<<8; // 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;
cout<<"f1="<<f1<<", f2="<<f2[0]<<f2[f2.len()-1]<<", len="<<f2.len()<<endl;
}
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[f2.len()-1]<<", len="<<f2.len()<<endl;
}
}
int main()
{
otl_connect::otl_initialize(); // initialize the database API environment
try{
db.rlogon("scott/tiger@mysql35"); // 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 varbinary(700))"
); // 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.sqlstate<<endl; // print out SQLSTATE
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;
}
f1=8, f2=*?, len=700
f1=9, f2=*?, len=700
f1=10, f2=*?, len=700
f1=11, f2=*?, len=700
f1=12, f2=*?, len=700
f1=13, f2=*?, len=700
f1=14, f2=*?, len=700
f1=15, f2=*?, len=700
f1=16, f2=*?, len=700
f1=4, f2=*?, len=700
f1=5, f2=*?, len=700
f1=6, f2=*?, len=700
f1=7, f2=*?, len=700
f1=8, f2=*?, len=700
Copyright © 1996, 2007, Sergei Kuchin, email: skuchin@ispwest.com, skuchin@yahogmail .
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.