#include <iostream.h> #include <stdio.h>
#define OTL_DB2_CLI // Compile OTL 4.0/DB-CLI
#include <otlv4.h> // include the OTL 4.0 header file
otl_connect db1, db2, db3; // connect objects
void insert()
// insert rows into table
{
otl_stream o(50, // buffer size
"insert into test_tab values(:f1<float>,:f2<char[31]>)",
// SQL statement
db1 // connect object
);
o.set_commit(0); // set stream's auto-commit to OFF
char tmp[32];
for(int i=1;i<=100;++i){
sprintf(tmp,"Name%d",i);
o<<(float)i<<tmp;
}
o.set_flush();
// At this point, rows are posted but not yet committed to the database
}
void select(otl_connect& db)
{
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
float f1;
char f2[31];
i<<4<<4; // 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
i>>f1>>f2;
cout<<"f1="<<f1<<", f2="<<f2<<endl;
}
}
int main()
{
otl_connect::otl_initialize(); // initialize DB2-CLI environment
try{
db1.rlogon("UID=scott;PWD=tiger;DSN=db2sql"); // connect to DB2
db2.rlogon("UID=scott;PWD=tiger;DSN=db2sql"); // connect to DB2
db3.rlogon("UID=scott;PWD=tiger;DSN=db2sql"); // connect to DB2
db2.set_transaction_isolation_level(otl_tran_read_uncommitted);
db3.set_transaction_isolation_level(otl_tran_read_committed);
otl_cursor::direct_exec
(
db1,
"drop table test_tab",
otl_exception::disabled // disable OTL exceptions
); // drop table
otl_cursor::direct_exec
(
db1,
"create table test_tab(f1 int, f2 varchar(30))"
); // create table
db1.commit(); // committing the DDLs to the database
insert(); // insert records into table
cout<<"=======> Reading uncommitted data..."<<endl;
select(db2); // select records from table
db1.commit(); // committing the inserted rows to the database
cout<<"=======> Reading committed data..."<<endl;
select(db3); // 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
}
db1.logoff(); // disconnect from DB2
db2.logoff(); // disconnect from DB2
db3.logoff(); // disconnect from DB2
return 0;
}
=======> Reading uncommitted data... f1=4, f2=Name4 f1=5, f2=Name5 f1=6, f2=Name6 f1=7, f2=Name7 f1=8, f2=Name8 =======> Reading committed data... f1=4, f2=Name4 f1=5, f2=Name5 f1=6, f2=Name6 f1=7, f2=Name7 f1=8, f2=Name8
Copyright © 1996, 2001, Sergei Kuchin, email: [email protected], [email protected] .
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.