php如何读取数据库信息

[pody]

假设有数据库db,表abc,表里面一个字段username，要如何读取username的信息？

麻烦各位给个源码，谢谢

[麻雀]

<?php
$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');
if (!$link) {
    die('Could not connect: ' . mysql_error());
}
$query = "select username from db.abc";

// Perform Query
$result = mysql_query($query);

while ($row = mysql_fetch_assoc($result)) {
    echo $row['username'];
}

mysql_free_result($result);

mysql_close($link);
?> 

[littlebirds]

select 'username' from db.'abc'

[CunningBoy]

<?php
$query = "select username from db.abc";

// Perform Query
$result = mysql_query($query);

while ($row = mysql_fetch_assoc($result)) {
    echo $row['username'];
}

mysql_free_result($result);
?>

[床上等您]

首先连接数据库。选择。再操作

[blue44sky]

顶楼上