pg_field_prtlen

(PHP 4 >= 4.2.0, PHP 5)

Описание

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.

Список параметров

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";   } ?> 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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