Undefined index in associative array and error in MySQL syntax

Question

When trying to INSERT data into a database table, I've been getting the following errors:

Notice: Undefined index: follower_user_id in C:\xampp\htdocs\blog\newentry.php on line 29
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ' 'post', 12, NOW(), NOW())' at line 1

The related code is as follows:

$node_sql = "SELECT * FROM nodes WHERE followed_blog_id=".$row['id']." order by id DESC;";
    $node_result = mysql_query($sql);

while ($node_row = mysql_fetch_assoc($node_result)){

            $event_sql = "INSERT INTO events (followed_id, follower_id, type, item_id, last_active, date) VALUES (".$row['id'].", ".$node_row['follower_user_id'].", 'post', ".$item_id.", NOW(), NOW());";
            mysql_query($event_sql) or die(mysql_error());
        }

While the notice says the index "follower_user_id" is undefined on line 29, I checked the database table and it is the correct index spelled correctly, so I have no idea as to what is causing this problem. I've also checked the syntax for the SQL statement and I don't see any problem with it. What have I overlooked here?

Any help would be appreciated!

You have 2 sql statement which one are you using? $node_sql or $sql — codingbiz
– codingbiz, Commented Aug 5, 2012 at 3:03

Lea de Groot · Accepted Answer · 2012-08-05 03:11:03Z

1

line 2 $node_result = mysql_query($sql); should probably use $node_sql as the variable in the query call. I think the generated INSERT statement has a blank $node_row['follower_user_id'] so there are two commas with nothing in between, causing the sql parser to cry :)

answered Aug 5, 2012 at 3:11

Lea de Groot

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1 Comment

Cloud Strife Over a year ago

Thanks, this solved it! I can't believe I overlooked such a silly mistake!

Xhezairi · Accepted Answer · 2012-08-05 03:25:14Z

0

I can't find the comment link on the question, so I'll post it as an answer.

You're using a single quote on 'post' whereas every other value is covered in double quotes.

Hint: You can freely use variables alone when within a double-quoted statement. Easy SQL on the eyes.

Here's the updated version of the SQL INSERT line:

$event_sql = "INSERT INTO events (followed_id, follower_id, type, item_id, last_active, date)
              VALUES ({$row["id"]}, {$node_row["follower_user_id"]},
                      `post`, $item_id, NOW(), NOW();";

edited Aug 5, 2012 at 3:25

answered Aug 5, 2012 at 3:07

Xhezairi

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1 Comment

Cloud Strife Over a year ago

The reason why I used single quotes is because "post" is not a variable, but rather a value I want to insert into the column manually.

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