MySQL 元数据查看及实例代码

# 方法 1
# 使用do( ) 执行 $query 
my $count = $dbh->do ($query);
# 如果发生错误会输出 0
printf "%d rows were affected\n", (defined ($count) ? $count : 0);

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

 
$result_id = mysql_query ($query, $conn_id);
# 如果查询失败返回 
$count = ($result_id ? mysql_affected_rows ($conn_id) : 0);
print ("$count rows were affected\n");

# 获取当前数据库中所有可用的表。
my @tables = $dbh->tables ( );
foreach $table (@tables ){
  print "Table Name $table\n";
}

 
<?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);
?>