pg_select

(PHP 4 >= 4.3.0, PHP 5)

pg_select --  Select records

Описание

mixed pg_select ( resource connection, string table_name, array assoc_array [, int options] )

pg_select() selects records specified by assoc_array which has field=>value. For a successful query, it returns an array containing all records and fields that match the condition specified by assoc_array.

If options is specified, pg_convert() is applied to assoc_array with the specified flags.

Внимание

Эта функция является ЭКСПЕРИМЕНТАЛЬНОЙ. Поведение этой функции, ее имя и относящаяся к ней документация могут измениться в последующих версиях PHP без уведомления. Используйте эту функцию на свой страх и риск.

Список параметров

connection

PostgreSQL database connection resource.

table_name

Name of the table from which to select rows.

assoc_array

An array whose keys are field names in the table table_name, and whose values are what matched rows are to be updated to.

condition

An array whose keys are field names in the table table_name, and whose values are the conditions that a row must meet to be retrieved.

options

Any number of PGSQL_CONV_FORCE_NULL, PGSQL_DML_NO_CONV, PGSQL_DML_EXEC, PGSQL_DML_ASYNC or PGSQL_DML_STRING combined. If PGSQL_DML_STRING is part of the options then query string is returned.

Возвращаемые значения

Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки. Returns string if PGSQL_DML_STRING is passed via options.

Примеры

Пример 1. pg_select() example

<?php
  $db = pg_connect('dbname=foo');
  // This is safe, since $_POST is converted automatically
  $rec = pg_select($db, 'post_log', $_POST);
  if ($rec) {
     echo "Records selected\n";
     var_dump($rec);
  } else {
     echo "User must have sent wrong inputs\n";
  }
?>

Смотрите также

pg_convert()



pg_select
wietse at cj2 dot nl
27-Feb-2006 08:20
David mentioned that you can't do a Select all.
However, when executing this script:
<?php
   $conn_string = "dbname=mydb";
   $db = pg_connect($conn_string);
   $selectfields = array("imgid" => "");
   $records = pg_select($db,"mmsfiles",$selectfields);
   print_r($records);
?>
...I get this result:
Array
(
   [0] => Array
       (
           [imgid] => 1
           [file] => /home/wietse/public_html/mms/images/1.gif
           [thumb] =>
       )
   [1] => Array
       (
           [imgid] => 2
           [file] => /home/wietse/public_html/mms/images/2.gif
           [thumb] =>
       )
   [2] => Array
       (
           [imgid] => 3
           [file] => /home/wietse/public_html/mms/images/3.gif
           [thumb] =>
       )
   [3] => Array
       (
           [imgid] => 4
           [file] => /home/wietse/public_html/mms/images/4.gif
           [thumb] =>
       )
)
david dot tulloh at infaze dot com dot au
16-May-2005 09:46
Valid options are PGSQL_DML_NO_CONV, PGSQL_DML_EXEC, PGSQL_DMP_ASYNC, PGSQL_DML_STRING (pulled out of source code).

This function does not support selecting from multiple tables.  You can get around this by setting the PGSQL_DML_NO_CONV option.  This prevents the error which occurs when the function tries to convert the condition array.

I think it is also important to point out that the table_name field is not safe, particularily with the PGSQL_DML_NO_CONV option.

The arguements array field is compulsory, as documented.  What isn't so clear is that the array has to actually have some values in it, you can't do a select all.

In summary, this function is good for a very small subset of basic queries.  If you are after anything more complex you are better off with pg_query.

<pg_result_statuspg_send_execute>
 Last updated: Tue, 15 Nov 2005