#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 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 ODBC environment
try{
db1.rlogon("scott/tigger@sybsql"); // connect to ODBC
db2.rlogon("scott/tigger@sybsql"); // connect to ODBC
db3.rlogon("scott/tigger@sybsql"); // connect to ODBC
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 not null, f2 varchar(30), primary key(f1))"
); // 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 ODBC
db2.logoff(); // disconnect from ODBC
db3.logoff(); // disconnect from ODBC
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 © 1996-2024, Sergei Kuchin, email: skuchin@gmail.com, skuchin@gmail.com .
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. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.