PG_TRACE(3)															       PG_TRACE(3)

pg_trace - Enable tracing a PostgreSQL connection

SYNOPSIS

       bool pg_trace (string  $pathname, [string  $mode = "w"], [resource  $connection])

DESCRIPTION

       pg_trace(3)  enables  tracing  of the PostgreSQL frontend/backend communication to a file. To fully understand the results, one needs to be
       familiar with the internals of PostgreSQL communication protocol.

       For those who are not, it can still be useful for tracing errors in queries sent to the server, you could do for example grep '^To backend'
       trace.log and see what queries actually were sent to the PostgreSQL server. For more information, refer to the PostgreSQL Documentation.

PARAMETERS

	      o $pathname
		- The full path and file name of the file in which to write the trace log. Same as in fopen(3).

	      o $mode
		- An optional file access mode, same as for fopen(3).

	      o $connection
		- PostgreSQL database connection resource. When $connection is not present, the default connection is used. The default connection
		is the last connection made by pg_connect(3) or pg_pconnect(3).

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      pg_trace(3) example

	      <?php
	      $pgsql_conn = pg_connect("dbname=mark host=localhost");

	      if ($pgsql_conn) {
		 pg_trace('/tmp/trace.log', 'w', $pgsql_conn);
		 pg_query("SELECT 1");
		 pg_untrace($pgsql_conn);
		 // Now /tmp/trace.log will contain backend communication
	      } else {
		 print pg_last_error($pgsql_conn);
		 exit;
	      }
	      ?>

SEE ALSO

       fopen(3), pg_untrace(3).

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