This example demonstrates OTL stream's new int buffer size in a simple INSERT, SELECT and constant SQL statements.
#include <iostream>
using namespace std;
#include <stdio.h>
#define OTL_ODBC_MSSQL_2008 // Compile OTL 4/ODBC, MS SQL 2008
//#define OTL_ODBC // Compile OTL 4/ODBC. Uncomment this when used with MS SQL 7.0/ 2000
#include <otlv4.h> // include the OTL 4.0 header file
otl_connect db; // connect object
void insert()
// insert rows into table
{
otl_stream o(20000, // buffer size for SQL 2005 + SP1,
// buffer size can be set to 80000 for SQL 2000
"insert into test_tab values(:f1<int>,:f2<char[31]>)",
// SQL statement
db // connect object
);
char tmp[32];
for(int i=1;i<=100000;++i){
sprintf(tmp,"Name%d",i);
o<<i<<tmp;
}
}
void select()
{
otl_stream i(50000, // buffer size
"select * from test_tab where f1>=:f11<int> and f1<=:f12<int>",
// SELECT statement
db // connect object
);
// create select stream
float f1;
char f2[31];
i<<80000<<80008;
// 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<<endl;
}
}
int main()
{
otl_connect::otl_initialize(); // initialize the database API environment
try{
db.rlogon("scott/tiger@mssql2008"); // 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))"
); // 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;
}
f1=80000, f2=Name80000
f1=80001, f2=Name80001
f1=80002, f2=Name80002
f1=80003, f2=Name80003
f1=80004, f2=Name80004
f1=80005, f2=Name80005
f1=80006, f2=Name80006
f1=80007, f2=Name80007
f1=80008, f2=Name80008
Copyright © 1996-2024, Sergei Kuchin, email: skuchin@gmail.com, skuchin@gmail.com/a>.