如何使用mysql查询在wordpress页面中显示帖子？

Question

I want to display Posts details in WordPress page. I have added MySQL query in WordPress page(All Pages -> Add New Page --> Added the Code ). I am using INSERT PHP WordPress plugin for that.. Still it displays the error..

How to do this..? The Code which I have used is given below...

[insert_php]
$con=mysqli_connect("localhost","DB_NAME","DB_PW((","DB_NAME");
$sqli="select * from cre_term_relationships where term_taxonomy_id=1";
$res=mysqli_query($sqli) or die(mysqli_error());
while($row=mysqli_fetch_array($res,MYSQLI_ASSOC))
{
echo $row["object_id"];
}
[/insert_php]

Answer 1

There are a few problems with your code.

Firstly, you're not passing your DB connection parameter to the query.

$res=mysqli_query($sqli)
                  ^ missing the 1st parameter.

Modify it to read as:

$res=mysqli_query($con, $sqli)

and mysqli_error() requires DB connection be passed as a parameter

• mysqli_error($con)

References:

• http://php.net/manual/en/mysqli.query.php
• http://php.net/manual/en/mysqli.error.php

However, WordPress has its own MySQL core functions. I don't know why you're using mysql_

• https://wordpress.org/plugins/mysqli/

---

This line:

$con=mysqli_connect("localhost","DB_NAME","DB_PW((","DB_NAME");

remove the excess brackets and the order:

$con=mysqli_connect("localhost","DB_USERNAME","DB_PW","DB_NAME");

assuming DB_USERNAME is a pre-defined constant that isn't showing in your question.

Syntax is:

1. host
2. username
3. password
4. database

However, constants do not get wrapped in quotes:

$con=mysqli_connect("localhost", DB_USERNAME, DB_PW, DB_NAME);

if you have in fact defined your constants.

You will need to elaborate on this, and to update your question, should my answer not provide the solution.

Consult the following regarding the use of constants:

• http://php.net/manual/en/language.constants.php