PHP: pg_field_size

Описание

int pg_field_size ( resource result, int field_number )

pg_field_size() returns the internal storage size (in bytes) of the field number in the given PostgreSQL result.

Замечание: This function used to be called pg_fieldsize().

Список параметров

result: PostgreSQL query result resource, returned by pg_query(), pg_query_params() or pg_execute() (among others).
field_number: Field number, starting from 0.

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

pg_field_size

ij at NOSPAM dot irj dot co dot za
14-Jun-2005 04:21


To view the file structure of a table using a sql query



select pg_class.relname, pg_attribute.attname, pg_type.typname, pg_type.typlen from pg_class, pg_attribute, pg_type  where pg_class.relname = 'YOURTABLENAME' and pg_class.oid = pg_attribute.attrelid and pg_type.oid = pg_attribute.atttypid having attnum > 0

php at tribun dot de
23-Feb-2005 05:49


function get_create_syntax( $table )

{

  $qry  =  "

            SELECT    *

            FROM      $table

            LIMIT     1

          ";

  $res = pg_query( $qry );

  $row = pg_fetch_assoc( $res );



  $create = "CREATE TABLE $table \n(\n";



  $item = array();

  for( $i = 0; $i < count( $row ); $i++ )

  {

    $name = pg_field_name( $res, $i );

    $type = pg_field_type( $res, $i );

    $size = pg_field_size( $res, $i );



    $item[$i] = '"'.$name.'" '.$type;



    $qry  =  "

              SELECT    a.atttypmod    AS size,

                        a.attnotnull  AS notnull

              FROM      pg_attribute  AS a,

                        pg_class      AS c

              WHERE     c.relname   = '$table'

              AND       a.attrelid  =  c.oid

              AND       a.attname    =  '$name'

             ";

    $res2  = pg_query( $qry );

    $out  = pg_fetch_object( $res2 );



    if( $out -> size != -1 )

    {

      $item[$i] .= '('.( $out -> size - 4 ).')';

    }

    if( $out -> notnull == 't' )

    $item[$i] .= ' NOT';



    $item[$i] .= ' NULL';



  }

  $create .= implode( ",\n", $item ) ."\n);";



  return $create;

}

alex at linuxNOSPAM dot org dot pe
02-Jul-2002 09:44


How i can extract the struct of a Postgresql Table?



I want to do a dynamic php code, that see the pg table, and print name, type and size of fields

pg_field_size

Описание

Список параметров

Возвращаемые значения

Примеры

Смотрите также