查询数据库中所有表名
select table_name from information_schema.tables where table_schema=\'csdb\' and table_type=\'base table\';
查询指定数据库中指定表的所有字段名column_name
select column_name from information_schema.columns where table_schema=\'csdb\' and table_name=\'users\'
php获取：
$server = \'localhost\';
$user = \'root\';
$pass = \'\';
$dbname = \'dayanmei_com\';
$conn = mysql_connect($server,$user,$pass);
if(!$conn) die("数据库系统连接失败！");
mysql_select_db($dbname) or die("数据库连接失败！");
$result = mysql_query("SHOW TABLES");
while($row = mysql_fetch_array($result))
{
echo $row[0]."";
}
mysql_free_result($result);