<?php

// Функция потребуется, поскольку PostgreSQL-соединение связывает базу данных
function pg_list_dbs($db)
{
    assert(is_resource($db));

    $query = '
SELECT
   d.datname as "Name",
   u.usename as "Owner",
   pg_encoding_to_char(d.encoding) as "Encoding"
FROM
   pg_database d LEFT JOIN pg_user u ON d.datdba = u.usesysid
ORDER BY 1;
';
    return pg_query($db, $query);
}

// Список таблиц
function pg_list_tables($db)
{
    assert(is_resource($db));

    $query = "
SELECT
   c.relname as \"Name\",
   CASE c.relkind WHEN 'r' THEN 'table' WHEN 'v' THEN 'view' WHEN 'i' THEN 'index' WHEN 'S' THEN 'sequence' WHEN 's' THEN 'special' END as \"Type\",
   u.usename as \"Owner\"
FROM
   pg_class c LEFT JOIN pg_user u ON c.relowner = u.usesysid
WHERE
   c.relkind IN ('r','v','S','')
   AND c.relname !~ '^pg_'
ORDER BY 1;
";
    return pg_query($db, $query);
}

// Смотрите также описание функции pg_meta_data(). Функция возвращает определение поля в виде массива
function pg_list_fields($db, $table)
{
    assert(is_resource($db));
    $query = "
SELECT
   a.attname,
   format_type(a.atttypid, a.atttypmod),
   a.attnotnull,
   a.atthasdef,
   a.attnum
FROM
   pg_class c,
   pg_attribute a
WHERE
   c.relname = '".$table."'
   AND a.attnum > 0 AND a.attrelid = c.oid
ORDER BY a.attnum;
";
    return pg_query($db, $query);
}

?>