pg_field_name

Returns the name of a field (PHP 4 >= 4.2.0, PHP 5)
string pg_field_name ( resource result, int field_number )

pg_field_name() returns the name of the field occupying the given field_number in the given PostgreSQL result resource. Field numbering starts from 0.

Note:

This function used to be called pg_fieldname().

Parameters

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

Return Values

The field name, or FALSE on error.

Examples

Example 1927. Getting information about fields

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<?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";

  }
?>

The above example will output:

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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

See Also

pg_field_num()

Code Examples / Notes » pg_field_name

The pg_fieldname function only returns the unqualified name from the select statement. example: select c.name, con.name from customer c, contacts con where con.customer_id = c.id; pg_fieldname will return "name" for both fields instead of c.name and con.name. This is a PostgreSQL limitation, not a PHP limitation. if you need different field names you should use : select c.name as customer_name, con.name as contact_name from customer c, contacts con where con.customer_id = c.id; then pg_fieldname will return "customer_name" and "contact_name"

In fact you can extract the size of the varchar field, by simply sending the following query: "select a.atttypmod,a.attrelid from pg_attribute as a, pg_class as c where c.relname='$table' AND a.attrelid=c.oid AND a.attname='$field'" here is a simple function that does that: function get_field_size($table, $field, $link) { $result = pg_query($link, "select a.atttypmod,a.attrelid from pg_attribute as a, pg_class as c where c.relname='$table' AND a.attrelid=c.oid AND a.attname='$field'"); $data = pg_fetch_object($result); return ($data->atttypmod - 4); } returned value is a size of a given field (also varchar)

pg_field_name

Returns the name of a field (PHP 4 >= 4.2.0, PHP 5) string pg_field_name ( resource result, int field_number )

Parameters

Return Values

Examples

Example 1927. Getting information about fields

Code Examples / Notes » pg_field_name

Change Language

Returns the name of a field (PHP 4 >= 4.2.0, PHP 5)
string pg_field_name ( resource result, int field_number )