The column names if you use PGSQL_ASSOC or PGSQL_BOTH are always in lowercase, no matter what the name is in the database or in the query.
(PHP 4, PHP 5, PHP 7, PHP 8)
pg_fetch_array — Lee una línea de resultado PostgreSQL en un array
pg_fetch_array() devuelve un array que contiene la línea solicitada.
pg_fetch_array() es una versión mejorada de pg_fetch_row(). Además de proporcionar un array con índice numérico, también puede almacenar los datos en un array asociativo, utilizando los nombres de los campos como claves. Estas dos funciones utilizan el array asociativo por omisión.
Nota: Esta función define los campos NULL al valor PHP
null.
pg_fetch_array() no es significativamente más lenta que pg_fetch_row() y aporta una comodidad de uso apreciable.
resultUna instancia PgSql\Result, devuelta por pg_query(), pg_query_params(), o pg_execute() (entre otros).
row
Número de la línea a recuperar. Las líneas están numeradas
comenzando por 0. Si el argumento es omitido o si vale null,
se recupera la línea siguiente.
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 con índice numérico (comenzando por 0), asociativo (indexado con
el nombre de los campos) o ambos.
Cada valor en el array está representado como un string
(string). Los valores null de la base de datos son
devueltos como null.
false es devuelto si row excede el número de
líneas en el conjunto de resultados, no hay más líneas disponibles o cualquier
otro error.
Intentar recuperar el resultado de una consulta que no sea SELECT también devolverá false.
| Versión | Descripción |
|---|---|
| 8.1.0 |
El parámetro result ahora espera una instancia de
PgSql\Result ; anteriormente, se esperaba un resource.
|
Ejemplo #1 Ejemplo con pg_fetch_array()
<?php
$conn = pg_pconnect ("dbname=publisher");
if (!$conn) {
echo "Error de conexión.\n";
exit;
}
$result = pg_query ($conn, "SELECT autor, email FROM autores");
if (!$result) {
echo "Error durante la consulta.\n";
exit;
}
$arr = pg_fetch_array ($result, 0, PGSQL_NUM);
echo $arr[0] . " <- Línea 1 Autor\n";
echo $arr[1] . " <- Línea 1 Correo electrónico\n";
// El parámetro row es opcional; NULL puede ser pasado en su lugar,
// para pasar un modo. Las llamadas sucesivas a pg_fetch_array
// devolverán la línea siguiente.
$arr = pg_fetch_array($result, NULL, PGSQL_ASSOC);
echo $arr["autor"] . " <- Línea 2 Autor\n";
echo $arr["email"] . " <- Línea 2 Correo electrónico\n";
$arr = pg_fetch_array($result);
echo $arr["autor"] . " <- Línea 3 Autor\n";
echo $arr[1] . " <- Línea 3 Correo electrónico\n";
?>
The column names if you use PGSQL_ASSOC or PGSQL_BOTH are always in lowercase, no matter what the name is in the database or in the query.As of PHP 4.1.0, you can now use code such as the following to iterate through a result set:
$conn = pg_connect("host=localhost dbname=whatever");
$result = pg_exec($conn, "select * from table");
while ($row = pg_fetch_array($result))
{
echo "data: ".$row["data"];
}
Can be a nice little time saver, PHP with MySQL has supported this for a while but I'm glad to see it extended to PostgreSQL...PGSQL_BOTH is the default, meaning your array size will be doubled.
If you specify this field (result type), include no quotes around it or you won't get any data, not even an error.
Here's my wrapper function:
function SQL_fetch_array($result_ndx, $row, $result_type=PGSQL_ASSOC) {
return pg_fetch_array($result_ndx, $row, $result_type);In addition to returning "false if there are no more rows", pg_fetch_array will also trigger an E_WARNING. You can temporarily turn that error reporting level off and suck out all your data like so:
<?php
$errRptLvl = error_reporting();
error_reporting($errRptLvl & ~(E_WARNING));
list($i,$j)=array(0,0);
while ($selection[$i++] = $this->fetchArray($j++)); // (fetchArray is a pg_fetch_array wrapper.)
error_reporting($errRptLvl); // Restore error reporting level.
unset($selection[$i-1]); // Delete the last, empty row.
return $selection;
?>Note that when using PGSQL_BOTH, numerically and associatively indexed fields are separate variables and treated as such:
<?php
$res = pg_query("Select 'foo' as bar");
$data = pg_fetch_array($res, 0, PGSQL_BOTH);
var_dump($data);
// Array(2)
// {
// [0] => string(3) "foo"
// ["bar"] => string(3) "foo"
// }
// This won't affect $data['bar']
$data[0] = 'bar';
var_dump($data);
// Array(2)
// {
// [0] => string(3) "bar"
// ["bar"] => string(3) "foo"
// }
?>
If you want to have reference binding between your numeric and associative indexes, you'll have to establish that yourself:
<?php
$result = pg_query("Select 'foo' as bar");
$data = pg_fetch_row($result);
// Establish references between column name/number
$from = $data;
foreach($from as $cx => $value)
{
$key = pg_field_name($result, $cx);
if (is_string($key)) $data[$key] =& $data[$cx];
}
var_dump($data);
// Array(2)
// {
// [0] => &string(3) "foo"
// ["bar"] => &string(3) "foo"
// }
// Note the reference binding between $data[0] and $data['bar']
$data[0] = 'baz';
var_dump($data);
// Array(2)
// {
// [0] => &string(3) "baz"
// ["bar"] => &string(3) "baz"
// }
?>(Timesaver) Be aware of the fact that keys in array returned by this function are (well, at least as of 4.2.3) of the same case as SQL column names (e.g. if your column name is ID then key name is also ID, not id or Id), and the keys in associative array are CASE SENSITIVE!!! So don't be surprised if you get unexpected results. Double check SQL column names and the key names.In response to eth0's comment below about SELECT'ing from two tables where the tables have columns with the same names, you can get around this problem like this:
"SELECT table1.foo AS foo1, table2.foo AS foo2 FROM table1, table2"
In the associative array returned, the keys will be "foo1" and "foo2".Hopefully most people realize this on their own, but the examples below where people tried to get creative with getting numerical or associative (not both) keys in the result are rather pointless. See the pg_fetch_assoc() and pg_fetch_row() for the built in functions that do this automatically. It's generally a better idea to use one of these other functions unless you *need* to access fields by both collumn name *and* index.Just because it is not really clear how to specify the result type, I poste this message.
I wrote a wrapper function which looks like this:
<?php
function db_fetch_array ($result, $row = NULL, $result_type = PGSQL_ASSOC)
{
$return = @pg_fetch_array ($result, $row, $result_type);
return $return;
}
?>
I think this way it is quite comfortable to get the arrays you want.Just remember when you 'or die' to close your table(s) or you may get a confused look from non-internet explorer users.Please remember that if you have for example a table Customers with "cust_ID", "name" and "address" and another table Users with "u_ID","name" and "other" and then you SELECT WHERE cust_ID=u_ID then you'll get in the result array ONLY ONE "name" field, precisely the last one resulted from the select!!!