# Method 1
# execute $query using do( )
my $count = $dbh->do ($query);
# report 0 rows if an error occurred
printf "%d rows were affected\n", (defined ($count) ? $count : 0);

# Method 2
# execute query using prepare( ) plus execute( )
my $sth = $dbh->prepare ($query);
my $count = $sth->execute ( );
printf "%d rows were affected\n", (defined ($count) ? $count : 0);

PHP 實例:

在PHP中，調(diào)用mysql_affected_rows()函數(shù)找出多少行查詢改變：

$result_id = mysql_query ($query, $conn_id);
# report 0 rows if the query failed
$count = ($result_id ? mysql_affected_rows ($conn_id) : 0);
print ("$count rows were affected\n");

表和數(shù)據(jù)庫清單(列表)：

很容易列出了所有與數(shù)據(jù)庫服務器的數(shù)據(jù)庫和表。如果沒有足夠的權限結(jié)果可能是空的。

除了方法，我剛才提到下面可以使用SHOW TABLES或SHOW DATABASES查詢的表或數(shù)據(jù)庫的列表，無論是在PHP或PERL。
PERL 實例:

# Get all the tables available in current database.
my @tables = $dbh->tables ( );
foreach $table (@tables ){
  print "Table Name $table\n";
}

PHP 實例:

<?php
$con = mysql_connect("localhost", "userid", "password");
if (!$con)
{
 die('Could not connect: ' . mysql_error());
}

$db_list = mysql_list_dbs($con);

while ($db = mysql_fetch_object($db_list))
{
 echo $db->Database . "<br />";
}
mysql_close($con);
?>

獲取服務器的元數(shù)據(jù)：

在MySQL可以執(zhí)行下面的命令是mysql提示符下使用，或使用任何腳本，如PHP，數(shù)據(jù)庫服務器獲取各種重要信息。

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