(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
pg_field_size — Restituisce la reale dimensione di memorizzazione del 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().
To view the file structure of a table using a sql queryselect 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 > 0function 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;}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