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PHP: pg_fetch_result - Manual
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pg_fetch_row" width="11" height="7"/> <pg_fetch_object
Last updated: Mon, 05 Feb 2007

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pg_fetch_result

(PHP 4 >= 4.2.0, PHP 5)

pg_fetch_result — 結果リソースから値を返す

説明

string pg_fetch_result ( resource result, int row, mixed field )
string pg_fetch_result ( resource result, mixed field )

pg_fetch_result() は、PostgreSQL 結果リソースから 特定の行とフィールド(カラム)の値を返します。

パラメータ

result

pg_query(), pg_query_params() あるいは pg_execute() から返される PostgreSQL の クエリ結果リソース。

row

結果から取得する行の番号。行番号は 0 から始まります。指定しなかった 場合は、次の行が読み込まれます。

field

取得するフィールド(カラム)の名前を表す文字列、あるいは取得する フィールドの番号。フィールド番号は 0 から始まります。

返り値

論理型の値は "t" あるいは "f" の形式で返します。 配列を含むそれ以外の型は、PostgreSQL のやりかたにしたがって文字列として フォーマットされた形式で返します。これは psql プログラムの出力と同じ形式です。データベースの NULL 値は、NULL として返します。

row が結果の行数より大きい場合、 あるいはそれ以外のエラーが発生した場合は FALSE を返します。

例 1785. pg_fetch_result() の例

<?php
$db
= pg_connect("dbname=users user=me") || die();

$res = pg_query($db, "SELECT 1 UNION ALL SELECT 2");

$val = pg_fetch_result($res, 1, 0);

echo
"First field in the second row is: ", $val, "\n";
?>

上の例の出力は以下となります。


First field in the second row is: 2

    

参考

pg_query()
pg_fetch_array()



add a note add a note User Contributed Notes
pg_fetch_result
Alan U. Kennington
22-Sep-2006 10:49
See bug #33809 http://bugs.php.net/bug.php?id=33809
Whether this really is a bug or a feature is not clear.
However, it is probably best to always put your column names in extra quotes.

$res = pg_query(...);
$colname = pg_field_name($res, $j);
pg_fetch_result($res, $i, "\"$colname\"");
Alan U Kennington
22-Sep-2006 09:16
In order to use upper case in pg_fetch_result column names, it is apparently necessary to include explicit quotation marks.

Thus when I do this sort of thing:

$res = pg_query(...);
$ncols = pg_num_fields($res);
for ($j = 0; $j < $ncols; ++$j) {
   $colname[$j] = pg_field_name($res, $j);
   $name = htmlspecialchars($colname[$j]);
   print("Column $j name = \"$name\"\n");
   $value = htmlspecialchars(pg_fetch_result($res, 0, $colname[$j]));
   print("Column \"{$colname[$j]}\" value = \"$value\"\n");
   }

I get this sort of thing:

[....]
Warning: pg_fetch_result() [function.pg-fetch-result]: Bad column offset specified in /.../view.php on line 247
Column 8 name = "VEC index"
Column "VEC index" value = ""

But if I change the $value line to this:

$value = htmlspecialchars(pg_fetch_result($res, 0, "\"$colname[$j]\""));

I get this:

[...]
Column 8 name = "VEC index"
Column "VEC index" value[0] = "47"

In my opinion, pg_fetch_result(...) should use the quotes already. In other words, this may be a bug in the PHP postgres library. It does not seem to be a documented feature of pg_fetch_result() although the postgresql manual documents it under "SQL syntax", "Lexical structure".

PHP version 5.1.4.
psql version 8.1.4.
Akbar
02-Dec-2004 01:01
Use can use pg_fetch_result when getting a value (like a smallint as in this example) returned by your stored procedure

<?php
$pgConnection
= pg_connect("dbname=users user=me");

$userNameToCheckFor = "metal";

$result = pg_query($pgConnection, "SELECT howManyUsersHaveThisName('$userNameToCheckFor')");

$count = pg_fetch_result($result, 0, 'howManyUsersHaveThisName');

?>
newby_AT_nobletec_DOT_com
05-Sep-2002 12:12
Comment on boolean fields:

If you retrieve a boolean value from the PostgreSQL database, be aware that the value returned will be either the character 't' or the character 'f', not an integer.  So, the statement

     if (pg_fetch_result($rsRecords,0,'blnTrueFalseField')) {
       echo "TRUE";
     } else {
       echo "FALSE";
     }

will echo "TRUE" in either case (True or False stored in the field).  In order to work as expected, do this instead:

     if (pg_fetch_result($rsRecords,0,'blnTrueFalseField') == 't') {
       echo "TRUE";
     } else {
       echo "FALSE";
     }

pg_fetch_row" width="11" height="7"/> <pg_fetch_object
Last updated: Mon, 05 Feb 2007
 
 
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