pg_trace

(PHP 4 >= 4.0.1, PHP 5, PHP 7, PHP 8)

pg_trace — Enable tracing a PostgreSQL connection

Descripción

pg_trace(
    string $filename,
    string $mode = "w",
    ?PgSql\Connection $connection = null,
    int $trace_mode = 0
): bool

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

filename

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

An PgSql\Connection instance. When connection is null, the default connection is used. The default connection is the last connection made by pg_connect() or pg_pconnect().

Advertencia

As of PHP 8.1.0, using the default connection is deprecated.

trace_mode

An optional trace mode with the following constants PGSQL_TRACE_SUPPRESS_TIMESTAMPS and PGSQL_TRACE_REGRESS_MODE

Valores devueltos

Devuelve true en caso de éxito o false en caso de error.

Historial de cambios

Versión	Descripción
8.3.0	`trace_mode` has been added.
8.1.0	The `connection` parameter expects an PgSql\Connection instance now; previously, a recurso was expected.
8.0.0	`connection` is now nullable.

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 un URL
pg_untrace() - Desactivar el rastreo de una conexión de PostgreSQL

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