Php中使用Select 查询语句的实例

<?php
$con = mysql_connect("localhost","peter","abc123");
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }
mysql_select_db("my_db", $con);
$result = mysql_query("SELECT * FROM Persons");
while($row = mysql_fetch_array($result))
  {
  echo $row['FirstName'] . " " . $row['LastName'];
  echo "<br />";
  }
mysql_close($con);
?>

<?php
define ('HOSTNAME', 'localhost'); //数据库主机名
define ('USERNAME', 'username'); //数据库用户名
define ('PASSWORD', 'password'); //数据库用户登录密码
define ('DATABASE_NAME', 'testdb'); //需要查询的数据库
$db = mysql_connect(HOSTNAME, USERNAME, PASSWORD) or
         die (mysql_error());
//连接不上，就会显示mysql出错的原因。
mysql_select_db(DATABASE_NAME);
//切换到testdb www.lexue001.com
$query =
"SELECT uri,title FROM testdb WHERE 1 ORDER by rand() LIMIT 1";
//上面这句的意思是从testdb中随机提取一条数据。
$result = mysql_query($query);
//查询
while ($row = mysql_fetch_array($result)) { echo "<p id="title">" ,
($row['title']) , "</p><p id="uri">–" , nl2br($row['uri'])
, "</p>"; }
//显示结果
mysql_free_result($result);
//释放结果
mysql_close();
//关闭连接
?>

mysql_query("SET NAMES GBK");或mysql_query("SET NAMES GB2312");

$mysql_mylink = mysql_connect($mysql_host, $mysql_user, $mysql_pass);
mysql_query("SET NAMES 'GBK'");