SunshinePHP Developer Conference 2015

pg_trace

(PHP 4 >= 4.0.1, PHP 5)

pg_traceEnable tracing a PostgreSQL connection

Descripción

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

pg_trace() 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.

Parámetros

pathname

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

mode

An optional file access mode, same as for fopen().

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() or pg_pconnect().

Valores devueltos

Devuelve TRUE en caso de éxito o FALSE en caso de error.

Ejemplos

Ejemplo #1 pg_trace() 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;
}
?>

Ver también

  • fopen() - Abre un fichero o una URL
  • pg_untrace() - Disable tracing of a PostgreSQL connection

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