使用从另一表获取的数组从一个表中进行SQL SELECT行

Question

I need to do something like this:

$user_id = (int) get_logged_in_userud();

**$thread_ids** = $wpdb->query( "SELECT thread_id FROM $tableName1 WHERE user_id = %s), $user_id);

$iterateRows = $wpdb->query( "SELECT thread_id FROM $tableName2 WHERE thread_id IN $s), **$thread_ids**);

I tried to grab it this way, but it returns an array in an array and each row is an associative array. Once I have this data I need to iterate through all the selected rows with something like a while loop.

I did try and do this on my own first, and came up with the below code. But its not in a usable format. I need to echo through each item like $row['col_name']; for each column. The goal is to list all messages that match a thread_id and user_id.

$grabThreadList = $wpdb->query( $wpdb->prepare("SELECT A.* FROM $recipientTableName WHERE A.thread_id IN (SELECT B.thread_id FROM $senderTableName WHERE B.thread_is = A.thread_id "));

    foreach ($grabThreadList as $key => $value){

    $implodeMe = implode(',,,few ', $value);

}

Answer 1

如果这是您要尝试执行的操作，则可以只使用SQL来执行此操作：

SELECT thread_id FROM $tableName2 WHERE thread_id IN (SELECT thread_id FROM $tableName1 WHERE user_id = %s)