pg_field_prtlen

Returns the printed length (PHP 4 >= 4.2.0, PHP 5)
int pg_field_prtlen ( resource result, int row_number, mixed field_name_or_number )

int pg_field_prtlen ( resource result, mixed field_name_or_number )

pg_field_prtlen() returns the actual printed length (number of characters) of a specific value in a PostgreSQL result. Row numbering starts at 0. This function will return -1 on an error.

field_name_or_number can be passed either as an integer or as a string. If it is passed as an integer, PHP recognises it as the field number, otherwise as field name.

See the example given at the pg_field_name() page.

Note:

This function used to be called pg_fieldprtlen().

Parameters

result: PostgreSQL query result resource, returned by pg_query(), pg_query_params() or pg_execute() (among others).
row: Row number in result. Rows are numbered from 0 upwards. If omitted, current row is fetched.

Return Values

The field printed length, or FALSE on error.

Examples

Example 1929. 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_size()

mysql_field_len () function and more for postgres ... problems ... * pg_field_prtlen ... gives the actual size of the field back (it shows the count of the content allready inside the field - not the possible max-len) * pg_filed_size ... can't be used for varchar or bpchar fields ...but there is a way to get the real-max-length of a field in postgreSQL via the system tables: //returns an array with infos of every field in the table (name, type, length, size) function SQLConstructFieldsInfo($TABLE, $DBCON) { $s="SELECT a.attname AS name, t.typname AS type, a.attlen AS size, a.atttypmod AS len, a.attstorage AS i FROM pg_attribute a , pg_class c, pg_type t WHERE c.relname = '$TABLE' AND a.attrelid = c.oid AND a.atttypid = t.oid"; if ($r = pg_query($DBCON,$s)) { $i=0; while ($q = pg_fetch_assoc($r)) { $a[$i]["type"]=$q["type"]; $a[$i]["name"]=$q["name"]; if($q["len"]<0 && $q["i"]!="x") { // in case of digits if needed ... (+1 for negative values) $a[$i]["len"]=(strlen(pow(2,($q["size"]*8)))+1); } else { $a[$i]["len"]=$q["len"]; } $a[$i]["size"]=$q["size"]; $i++; } return $a; } return null; } // usage $DBCON=pg_connect("host=YOUR-HOST port=YOUR-PORT dbname=YOUR-DB user=YOUR-USER password=YOUR-PASS"); $TABLE="YOUR-TABLENAME"; $RET=SQLConstructFieldsInfo($TABLE, $DBCON); $j = count($RET); for ($i=0; $i < $j; $i++) { echo " $i name=".$RET[$i]["name"]." type=".$RET[$i]["type"]." length=".$RET[$i]["len"]." size=".$RET[$i]["size"]." bytes"; }

pg_field_prtlen

Returns the printed length (PHP 4 >= 4.2.0, PHP 5)
int pg_field_prtlen ( resource result, int row_number, mixed field_name_or_number )

int pg_field_prtlen ( resource result, mixed field_name_or_number )

Parameters

Return Values

Examples

Example 1929. Getting information about fields

Code Examples / Notes » pg_field_prtlen

Change Language

pg_field_prtlen

Returns the printed length (PHP 4 >= 4.2.0, PHP 5) int pg_field_prtlen ( resource result, int row_number, mixed field_name_or_number ) int pg_field_prtlen ( resource result, mixed field_name_or_number )

Parameters

Return Values

Examples

Example 1929. Getting information about fields

Code Examples / Notes » pg_field_prtlen

Change Language

Returns the printed length (PHP 4 >= 4.2.0, PHP 5)
int pg_field_prtlen ( resource result, int row_number, mixed field_name_or_number )

int pg_field_prtlen ( resource result, mixed field_name_or_number )