This example demonstrates the traditional auto-commit mode that is usually set at the level of the database connection. In other words, when the mode is set, every execution of a SQL statement is followed by the automatic commit. This auto-commit has nothing to do with the otl_stream auto-commit.
#include <iostream.h> #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 for the first connection which will be
// set to "auto-commit"
otl_connect db2; // connect object for the second connection which will be
// used for selecting "auto-commited" rows
void insert()
// insert rows into table
{
// otl_nocommit_stream is more logical to use in this case because transactions
// commit anyway.
otl_nocommit_stream o
(50, // buffer size
"insert into test_tab values(:f1<float>,:f2<char[31]>)",
// SQL statement
db // connect object
);
char tmp[32];
for(int i=1;i<=100;++i){
sprintf(tmp,"Name%d",i);
o<<(float)i<<tmp;
}
}
void select()
{
otl_stream i(50, // buffer size
"select * from test_tab where f1>=:f1<int> and f1<=:f2<int>*2",
// SELECT statement
db2 // connect object
);
// create select stream
float f1;
char f2[31];
i<<8<<8; // assigning :f1 = 8, :f2 = 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<<endl;
}
i<<4<<4; // assigning :f1 = 4, :f2 = 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{
db.rlogon("scott/tiger@mssql",1); // connect to ODBC in the auto-commit mode.
db2.rlogon("scott/tiger@mssql"); // connect to ODBC
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.sqlstate<<endl; // print out SQLSTATE
cerr<<p.var_info<<endl; // print out the variable that caused the error
}
db.logoff(); // disconnect from ODBC
db2.logoff(); // disconnect from ODBC
return 0;
}
f1=8, f2=Name8 f1=9, f2=Name9 f1=10, f2=Name10 f1=11, f2=Name11 f1=12, f2=Name12 f1=13, f2=Name13 f1=14, f2=Name14 f1=15, f2=Name15 f1=16, f2=Name16 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.