Fatal error: Call to undefined method mysqli_resul

问题:

I have problems with PHP in Ubuntu 10.04. When I try use mysqli_result::fetch_all this error appears:

Call to undefined method mysqli_result::fetch_all()

However, it works in Windows XP.

The Code:

$result = $this->dbh->query('SELECT [...] ');
return $result->fetch_all(MYSQLI_ASSOC);

I don't want to use fetch_assoc with a loop because I send the result to another layer for processing.

I'm using PHP 5.4.4. and with php -m | grep mysql the mysqlnd module it doesn't appear. How can I install it? Could that be the problem?

回答1:

mysqli_result::fetch_all() requires MySQL Native Driver (mysqlnd).

chances are you might be missing it.

have a look at this posts, that might help you.

mysqli fetch_all() not a valid function?

回答2:

fetch_all consumes more memory than fetch_array() and has other detrimental side effects, so fetch_array/fetch_assoc are preferred.

Detailed from PHP documentation:

Available only with mysqlnd.

As mysqli_fetch_all() returns all the rows as an array in a single step, it may consume more memory than some similar functions such as mysqli_fetch_array(), which only returns one row at a time from the result set. Further, if you need to iterate over the result set, you will need a looping construct that will further impact performance. For these reasons mysqli_fetch_all() should only be used in those situations where the fetched result set will be sent to another layer for processing.

If you really want to use it, you have to install mySQL with native drive (mysqlnd) Example installation:

./configure --with-mysql=mysqlnd \
--with-mysqli=mysqlnd \
--with-pdo-mysql=mysqlnd \

On Ubuntu you can just do

sudo apt-get install php5-mysqlnd

回答3:

http://www.php.net/manual/en/mysqli-result.fetch-all.php

Available only with mysqlnd.

Notes about enabling mysqlnd: http://www.php.net/manual/en/mysqlnd.install.php