The example is wrong in Spanish version.
ERROR: mysql_fetch_assoc() expects parameter 1 to be resource, null given in XXX on line 5
while ($fila = mysql_fetch_assoc($res)) {
OK.
while ($fila = mysql_fetch_assoc($resultado)) {
(PHP 4, PHP 5)
mysql_list_dbs — List databases available on a MySQL server
This function was deprecated in PHP 5.4.0, and it and the entire original MySQL extension was removed in PHP 7.0.0. Instead, use either the actively developed MySQLi or PDO_MySQL extensions. See also the MySQL: choosing an API guide and its related FAQ entry for additional information. Alternatives to this function include:
$link_identifier = NULL
] )Returns a result pointer containing the databases available from the current mysql daemon.
link_identifierThe MySQL connection. If the
link identifier is not specified, the last link opened by
mysql_connect() is assumed. If no such link is found, it
will try to create one as if mysql_connect() was called
with no arguments. If no connection is found or established, an
E_WARNING level error is generated.
Returns a result pointer resource on success, or FALSE on
failure. Use the mysql_tablename() function to traverse
this result pointer, or any function for result tables, such as
mysql_fetch_array().
Example #1 mysql_list_dbs() example
<?php
// Usage without mysql_list_dbs()
$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');
$res = mysql_query("SHOW DATABASES");
while ($row = mysql_fetch_assoc($res)) {
echo $row['Database'] . "\n";
}
// Deprecated as of PHP 5.4.0
$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');
$db_list = mysql_list_dbs($link);
while ($row = mysql_fetch_object($db_list)) {
echo $row->Database . "\n";
}
?>
The above example will output something similar to:
database1 database2 database3
Note:
For backward compatibility, the following deprecated alias may be used: mysql_listdbs()
The example is wrong in Spanish version.
ERROR: mysql_fetch_assoc() expects parameter 1 to be resource, null given in XXX on line 5
while ($fila = mysql_fetch_assoc($res)) {
OK.
while ($fila = mysql_fetch_assoc($resultado)) {
The result pointer contains only the databases for which the mysql_user has the select priviledge granted.
Another alternative to this function is:
SQL Query: SELECT SCHEMA_NAME FROM INFORMATION_SCHEMA.SCHEMATA