(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)
pg_fetch_all — Lee todas las líneas de un resultado
pg_fetch_all() devuelve un array que contiene
todas las líneas de result.
Nota: Esta función define los campos NULL al valor PHP
null.
resultUna instancia PgSql\Result, devuelta por pg_query(), pg_query_params(), o pg_execute() (entre otros).
mode
Un parámetro opcional que controla cómo el array devuelto es indexado.
mode es una constante que puede tomar los siguientes valores :
PGSQL_ASSOC, PGSQL_NUM y PGSQL_BOTH.
Usando PGSQL_NUM, la función devolverá un array con índices numéricos,
usando PGSQL_ASSOC, devolverá solo índices asociativos
mientras que PGSQL_BOTH devolverá ambos índices numéricos y asociativos.
Un array array de todas las líneas en el conjunto de resultados. Cada línea es un array de valores de los campos indexado por el nombre de los campos.
| Versión | Descripción |
|---|---|
| 8.1.0 |
El parámetro result ahora espera una instancia de
PgSql\Result ; anteriormente, se esperaba un resource.
|
| 8.0.0 |
pg_fetch_all() devolverá ahora un array vacío
en lugar de false para los conjuntos de resultados con cero líneas.
|
| 7.1.0 |
Se ha añadido el argumento mode.
|
Ejemplo #1 Ejemplo con pg_fetch_all()
<?php
$conn = pg_pconnect("dbname=publisher");
if (!$conn) {
echo "Se ha producido un error.\n";
exit;
}
$result = pg_query($conn, "SELECT * FROM autores");
if (!$result) {
echo "Se ha producido un error.\n";
exit;
}
$arr = pg_fetch_all($result);
print_r($arr);
?>Resultado del ejemplo anterior es similar a :
Array
(
[0] => Array
(
[id] => 1
[name] => Fred
)
[1] => Array
(
[id] => 2
[name] => Bob
)
)
Also for those who are trying to move off oracle, pg_fetch_all returns an array with rows and columns inverted in the sense of ocifetchall. You would need to transpose this result array before your code takes the first index a column name and the second index a row index.PG functions retrieve data as strings. If you want automatic casting you need to use PDO.pg_fetch_all, despite the app note, accepts only one argument, the resultset. It does exactly what is expected, returning a two-dimensional array of the resultset. I suspect the app note given was just copied from pg_fetch_array, which is what you want to use for a single row.It seems like pg_fetch_all() only works on version 4.3.x. I tried it with 4.2.2 and it does not recognize the function, so I assume it won't work on 4 => 4.2.x.For those wondering, this function returns a two-dimentional array, the first dimension being a 0-based indexed array, the second dimension an associative. So you might access the first authors surname using $authors[0]["surname"].
Certainly this is the case in PHP 5.2.9, I can't vouch for other versions though.Be aware that pg_fetch_all() is subject to the same limitations as pg_fetch_assoc(), in that if your query returns multiple columns with the same name (or alias) then only the rightmost one will be returned in the associative array, other ones will not.
A simple example:
<?php
$res = pg_query(
"SELECT a.*, b.* -- Fetch all columns from both tables
FROM table1 AS a
LEFT OUTER JOIN table2 as b
USING (column)"
);
$rows = pg_fetch_all($res);
?>
In this example, since we're selecting columns via *, if any columns from table2 share the same names as those in table1, they will be the ones returned despite that table2 (as the optional side of an outer join) may return NULL values.
This is not a bug, just a limitation of associative arrays in general, and is easy enough to avoid by structuring your queries carefully and using column aliases to avoid confusion.If you configure in your pg_hba.conf file a connection by the md5 method and you didn't setup a password for that user, you must define a password by the "alter role" PostgreSQL command:
alter role user_name encrypted password 'user_password';
Also, if you is connecting by type TCP/IP (host) and your IP address is another than (localhost), as example (127.0.1.1) you must uncomment the following line at postgresql.conf file, adding your IP address:
listen_addresses = 'localhost,127.0.1.1'
After save the new configuration, you must restart your PostgreSQL service.For versions of PHP that don't yet support the new names or newer functions I wrote a couple functions like this one
if (! function_exists("pg_fetch_all")) {
function pg_fetch_all($res, $kind="assoc") {
$i = 0; // this is needed for the row integer in the looped pg_fetch_array
if ($kind == "assoc") {
while ($row = pg_fetch_array($res, $i, PGSQL_ASSOC)) {
$array_out[] = $row;
$i++;
}else{
while ($row = pg_fetch_array($res)) {
$array_out[] = $row;
}
}
return $array_out;
}
}