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";
  }
?>

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

Смотрите также

pg_field_size() - Returns the internal storage size of the named field