PostgreSQL 函数
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pg_affected_rows

(PHP 4 >= 4.2.0, PHP 5)

pg_affected_rows返回受影响的记录数目

说明

int pg_affected_rows ( resource $result )

pg_affected_rows() 返回在 pg_query() 中执行 INSERT,UPDATE 和 DELETE 查询后受到影响的记录数目(包括实例/记录/行)。如果本函数没有影响到任何记录,则返回 0。

Example #1 pg_affected_rows() 例子

<?php
$result 
pg_query($conn"INSERT INTO authors VALUES ('Orwell', 2002, 'Animal Farm')");
$cmdtuples pg_affected_rows($result);
echo 
$cmdtuples " tuples are affected.\n";
?>

Note:

本函数以前被称为 pg_cmdtuples()

参见 pg_query()pg_num_rows()


PostgreSQL 函数
在线手册:中文 英文
PHP手册
PHP手册 - N: 返回受影响的记录数目

用户评论:

Anonymous (20-Dec-2007 11:02)

There is something called auto-commit, when you supply more than one query delimited by ; semicolon all-or-none is done if one fails. No need for BEGIN;COMMIT;ROLLBACK when doing one query. its logic to mee pg_affected_rows() returns affected rows and if you want to do 2 queries apart from each other.. do a BEGIN and then 1 and get pg_affected_rows() then do 2 and get pg_affected_rows() and then finally do COMMIT;

Anonymous (14-Nov-2007 03:45)

pg-affected-rows () only runs on the LAST SQL STATEMENT executed.  If you compound several statements together then pg_affected_rows might not return what you expect. 

For example:

<?php

$result
= pg_query ('BEGIN; INSERT INTO foo (bar) VALUES (\'baz\'; COMMIT');

echo (
pg_affected_rows ($result));

?>

will cause 0 to be printed, because the last statement executed by Postgres was COMMIT, which doesn't affect any rows. 

I haven't tried this so am not certain it works, but you SHOULD be able to get the row counts you want if you split your queries up. 

For example:

<?php

$result
= pg_query ('BEGIN; INSERT INTO foo (bar) VALUES (\'baz\';');

echo (
pg_affected_rows ($result));

pg_query ('COMMIT;');
?>

should allow you to get the number of rows affected by the previous query.  I haven't tried this yet though, so don't count on it.

(05-Aug-2005 11:31)

That's not quite true, I've been able to execute multiple queries in a single call just fine. In stead, it has to do with the fact this function returns the affected rows for the last executed query, not the last set of queries specified to a single call to pg_query.

(29-Jun-2005 02:15)

Concering Bruno Baguette's note:

The pg_query function only allows one query per function call.  When you do your
$sql="BEGIN;
INSERT ...
COMMIT;";
$result=pg_query($conn,$sql);
echo pg_affected_rows($result);

you get a zero, because only the BEGIN; is executed.

The single query per call is, I beleive, a PHP builtin protection against SQL injection attacks.  (Ie someone submitting a string paramter that ends the current query and appends another one)

Bruno Baguette (28-Jun-2005 09:45)

Note that when you submit several SQL queries, within one BEGIN;COMMIT; like this one :

$SQLQuery = 'BEGIN;';
$SQLQuery.= 'INSERT INTO a (a,b) VALUES (1,2);';
$SQLQuery.= 'INSERT INTO b (ref_b,c) VALUES (2,5);';
$SQLQuery.= 'COMMIT;';

$HandleResults = pg_query($SQLQuery);
echo(pg_affected_rows($HandleResults));

pg_affected_rows() will return 0