数据库连接问题

Question

以下查询没有执行,我很难过为什么.查询返回die"错误查询数据库"的子句,但我的所有信息都是准确的.

我的查询变量中是否出现语法错误？

<?php
$db_host     = 'localhost';
$db_user     = 'root';
$db_pass     = 'root';
$db_database = 'bbg_db_2'; 

$dbc = mysql_connect($db_host,$db_user,$db_pass) or die('Unable to establish a database connection');

$query = "SELECT category_name, category_desc FROM categories";
$result = mysqli_query($dbc, $query) or die ('error querying database');

while ($row = mysqli_fetch_array($result)) {

    $catname = $row['category_name'];
    $catdesc = $row['category_desc'];

    echo "<li>$catname</br><span>$catdesc</span></li>";
}

mysqli_close($dbc);
?>

Answer 1

你错过了代码中的mysql_select_db($db_database).