pg_trace
(PHP 4 >= 4.0.1, PHP 5, PHP 7, PHP 8)
pg_trace — Enable tracing a PostgreSQL connection
Descrição
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.
Parâmetros
-
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 -
Uma instância de PgSql\Connection. Quando o parâmetro
connectionfornull, a conexão padrão será usada. A conexão padrão é a última conexão feita por pg_connect() ou pg_pconnect().AvisoA partir do PHP 8.1.0, usar a conexão padrão tornou-se defasado.
-
trace_mode -
An optional trace mode with the following constants
PGSQL_TRACE_SUPPRESS_TIMESTAMPSandPGSQL_TRACE_REGRESS_MODE
Valor Retornado
Retorna true em caso de sucesso ou false em caso de falha.
Registro de Alterações
| Versão | Descrição |
|---|---|
| 8.3.0 |
trace_mode has been added.
|
| 8.1.0 |
O parâmetro connection agora espera uma instância de PgSql\Connection;
anteriormente, um resource era esperado.
|
| 8.0.0 |
connection is now nullable.
|
Exemplos
Exemplo #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;
}
?>Veja Também
- fopen() - Abre um arquivo ou URL
- pg_untrace() - Disable tracing of a PostgreSQL connection
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