OTL 4.0, Example 634 ("Auto-commit every SQL statement / commit-on-success" mode)

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.

Source Code

#include <iostream>
using namespace std;

#include <stdio.h>
// Compile OTL 4.0/ODBC in Windows. Informix CLI uses the  
// regular ODBC header files in Windows
#define OTL_ODBC

// Uncomment the #defines below in Linux / Unix
//#define OTL_ODBC_UNIX
//#define OTL_INFORMIX_CLI
#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-committed" 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>=:f11<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 Informix CLI environment
try{

db.rlogon("informix/tigger@informixsql",1); // connect to Informix in the auto-commit mode.
db2.rlogon("informix/tigger@informixsql"); // connect to Informix


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 Informix
db2.logoff(); // disconnect from Informix

return 0;

}

Output

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=Name

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Copyright © 1996-2017, Sergei Kuchin, email: skuchin@gmail.com, skuchin@gmail.com.

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