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/*
* testlibpq4.cc
* Test of the asynchronous notification interface
*
populate a test database with the following (use testlibpq4.sql):
CREATE TABLE TBL1 (i int4);
CREATE TABLE TBL2 (i int4);
CREATE RULE r1 AS ON INSERT TO TBL1 DO [INSERT INTO TBL2 values (new.i); NOTIFY TBL2];
* Then start up this program
* After the program has begun, do
INSERT INTO TBL1 values (10);
*
*
*/
#include <iostream.h>
#include <libpq++.h>
#include <stdlib.h>
main()
{
// Begin, by connecting to the backend using hardwired constants
// and a test database created by the user prior to the invokation
// of this test program.
char* dbName = getenv("USER"); // change this to the name of your test database
PgDatabase data(dbName);
// Check to see that the backend connection was successfully made
if ( data.ConnectionBad() ) {
cerr << "Connection to database '" << dbName << "' failed." << endl
<< data.ErrorMessage() << endl;
exit(1);
}
// Listen to a table
if ( !data.ExecCommandOk("LISTEN TBL2") ) {
cerr << "LISTEN command failed" << endl;
exit(1);
}
// Test asynchronous notification
while (1) {
// check for asynchronous returns
PGnotify* notify = data.Notifies();
if (notify) {
cerr << "ASYNC NOTIFY of '" << notify->relname
<< "' from backend pid '" << notify->be_pid
<< "' received" << endl;
free(notify);
break;
}
}
}
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