PostgreSQL 函数
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pg_fetch_all_columns

(PHP 5 >= 5.1.0)

pg_fetch_all_columns — Fetches all rows in a particular result column as an array

说明

array pg_fetch_all_columns ( resource $result [, int $column = 0 ] )

pg_fetch_all_columns() returns an array that contains all rows (records) in a particular column of the result resource.

Note: 此函数将 NULL 字段设置为 PHP NULL 值。

参数

result

PostgreSQL query result resource, returned by pg_query(), pg_query_params() or pg_execute() (among others).

column

Column number, zero-based, to be retrieved from the result resource. Defaults to the first column if not specified.

返回值

An array with all values in the result column.

FALSE is returned if column is larger than the number of columns in the result, or on any other error.

范例

Example #1 pg_fetch_all_columns() example

<?php 
$conn = pg_pconnect("dbname=publisher");
if (!$conn) {
  echo "An error occured.\n";
  exit;
}

$result = pg_query($conn, "SELECT title, name, address FROM authors");
if (!$result) {
  echo "An error occured.\n";
  exit;
}

// Get an array of all author names
$arr = pg_fetch_all_columns($result, 1);

var_dump($arr);

?>

参见

PostgreSQL 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: Fetches all rows in a particular result column as an array

用户评论:

strata_ranger at hotmail dot com (05-Apr-2009 02:43)

Unfortunate that pg_fetch_all_columns() doesn't support fetching a column by its name -- if you want to do that, you'll need to use pg_field_num() as an intermediary:

For example:

<?php

if ($foo)
  $cols = "email_address";

else
  $cols = "last_name, middle_init";

$result = pg_query("Select first_name, $info, birthday from users_table");

// Problem -- does column #2 refer to the 'birthday' or 'middle_init' field?
$array = pg_fetch_all_columns($result, 2);

// Won't work, must use a column number instead of its name
$array = pg_fetch_all_columns($result, 'birthday');

// Works
$array = pg_fetch_all_columns($result, pg_field_num($result, 'birthday'));

?>

massiv at nerdshack dot com (22-Oct-2008 01:56)

php 4 equivalent:

<?php
$conn = pg_pconnect("dbname=publisher");
if (!$conn) {
  echo "An error occured.\n";
  exit;
}

$result = pg_query($conn, "SELECT title, name, address FROM authors");
if (!$result) {
  echo "An error occured.\n";
  exit;
}

// Get an array of all author names
$arr = array();
while ($line = pg_fetch_array($result)) {
  array_push($arr, $line['name']);
}

var_dump($arr);

?>