[edit] Last updated: Fri, 23 Mar 2012

pg_select

(PHP 4 >= 4.3.0, PHP 5)

pg_select — Select records

Açıklama

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

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.

Uyarı

Bu işlev DENEYSELDİR. Bu işlevin davranışı, ismi ve belgeleri PHP'nin sonraki sürümlerinde hiçbir duyuru yapılmaksızın değiştirilebilir. Bu riski göze alamayacaksanız bu işlevi kullanmayın.

Değiştirgeler

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 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.

Dönen Değerler

Başarı durumunda TRUE, başarısızlık durumunda FALSE döner. Returns string if PGSQL_DML_STRING is passed via options.

Örnekler

Örnek 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";
  }
?>

Ayrıca Bakınız

pg_convert() - Convert associative array values into suitable for SQL statement

add a note User Contributed Notes pg_select

wietse at cj2 dot nl 27-Feb-2006 01:20


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 03:46


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.

add a note