Wordpress MySQL查询失败

Question

$query2 = "SELECT * FROM wp_posts WHERE post_status = 'publish'";
$result2 = mysql_query($query2);
if (!$result2) {
  die('Invalid query: ' . mysql_error());
}

if (mysql_numrows($result2) == 0) {
    echo("zero");
} else {
    echo(mysql_numrows($result2));
}

.. spent an hour on this, it should work but it doesn't, not sure where I'm going wrong.

Thanks

Answer 1

re. your comment: Call to undefined function  die()

It looks like you might have some non-ASCII character in the whitespace before your die() statement. Try deleting that whitespace and reinserting it, and maybe you'll find out what the database error is

Answer 2

You should use query like this

 $querystr = "SELECT $wpdb->posts.* FROM $wpdb->posts WHERE $wpdb->posts.post_status = 'publish'";
 $pageposts = $wpdb->get_results($querystr, OBJECT);

Should be using wpdb class to communicate with the database...

Answer 3

Try this:

$query2 = "SELECT * FROM wp_posts WHERE post_status = 'publish'";
$result2 = mysql_query("$query2");

Double quotes in the query.

Without the double quotes in the query, the query will look like:

$result2 = mysql_query(SELECT * FROM wp_posts WHERE post_status = 'publish');

Instead of:

$result2 = mysql_query("SELECT * FROM wp_posts WHERE post_status = 'publish'");