PHP 5.6.0 released

pg_field_size

(PHP 4 >= 4.2.0, PHP 5)

pg_field_size Restituisce la reale dimensione di memorizzazione del campo

Descrizione

int pg_field_size ( resource $risultato , int $indice_campo )

pg_field_size() restituisce la dimensione di memorizzazione (in bytes) del campo indicato all'interno di risultato. La numerazione dei campi comincia da 0. Una dimension del campo di -1 indica un campo a lunghezza variabile. Questa funzione restituisce FALSE in caso di errore.

Nota:

Questa funzione si chiamava pg_fieldsize().

Vedere anche pg_field_prtlen() e pg_field_type().

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User Contributed Notes 3 notes

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0
ij at NOSPAM dot irj dot co dot za
9 years ago
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
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php at tribun dot de
9 years ago
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;
}
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alex at linuxNOSPAM dot org dot pe
12 years ago
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
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