pg_field_prtlen
(PHP 4 >= 4.2.0, PHP 5)
pg_field_prtlen -- Returns the printed length
Описание
int
pg_field_prtlen ( resource result, int row_number, mixed field_name_or_number )
int
pg_field_prtlen ( resource result, mixed field_name_or_number )
pg_field_prtlen() returns the actual printed
length (number of characters) of a specific value in a PostgreSQL
result. Row numbering starts at 0. This
function will return -1 on an error.
field_name_or_number can be passed either as an
integer or as a string. If it is passed as an
integer, PHP recognises it as the field number, otherwise as
field name.
See the example given at the pg_field_name() page.
Замечание:
This function used to be called pg_fieldprtlen().
Список параметров
- result
PostgreSQL query result resource, returned by pg_query(),
pg_query_params() or pg_execute()
(among others).
- row
Row number in result. Rows are numbered from 0 upwards. If omitted,
current row is fetched.
Возвращаемые значения
The field printed length, or FALSE on error.
Примеры
Пример 1. Getting information about fields
<?php
$dbconn = pg_connect("dbname=publisher") or die("Could not connect");
$res = pg_query($dbconn, "select * from authors where author = 'Orwell'");
$i = pg_num_fields($res);
for ($j = 0; $j < $i; $j++) {
echo "column $j\n";
$fieldname = pg_field_name($res, $j);
echo "fieldname: $fieldname\n";
echo "printed length: " . pg_field_prtlen($res, $fieldname) . " characters\n";
echo "storage length: " . pg_field_size($res, $j) . " bytes\n";
echo "field type: " . pg_field_type($res, $j) . " \n\n";
}
?>
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Результат выполнения данного примера: column 0
fieldname: author
printed length: 6 characters
storage length: -1 bytes
field type: varchar
column 1
fieldname: year
printed length: 4 characters
storage length: 2 bytes
field type: int2
column 2
fieldname: title
printed length: 24 characters
storage length: -1 bytes
field type: varchar |
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