MYSQL在一行或多行中存储输入值

Question

I'm working with PHP and MySQL, and I'm not too experienced with database design. I know the basics of normalization, however my question is about storing vales from a specific form I have.

Ok, so the way my page in question is set up, there are text boxes that can be dynamically added or removed. If the user presses a "+" or "-" button it adds or removes another text box.

Anyway, when I pull the text box values via $_POST it is an array, and then I convert it to a string using implode() Ex: user enters "hello" "world" "bye" "world", implode converts it to the following string "hello,world,bye,world".

My question is would it be better to store this string "hello,world,bye,world" in 1 row as 1 entry, or would it be better to break this string into 4 separate strings and store it in 4 different rows? Each text box will contain questions/comments so they could be potentially long and most likely not 1 word like the example I gave.

The reason why I'm asking this is because all of these inputs will be used on the same page, so they can all share a unique ID. Instead of querying multiple times, I'd only have to query once.

Answer 1

They should be stored separately, because they're separate examples of one kind of data.

Your table would be (for example) comments , and each row should be one comment, so one row for hello , one for world , etc.

You could also store a page ID alongside the comments, so your table would look like this (note that you'd typically have an id field for comment id, as well. I've omitted it for brevity):

|--------------|---------|
| comment      | page_id |
|--------------|---------|
| hello        | 1       |
| world        | 1       |
| bye          | 2       |
|--------------|---------|

Then you can still search on page_id, but your data is logically separated, and you can search on the specific comments if you wish.

SELECT * FROM comments WHERE page_id = 1 -- 2 results

You can also do things like ordering it alphabetically, or by time (with a new column for that) very easily.

|--------------|---------|------------|
| comment      | page_id | time_made  |
|--------------|---------|------------|
| hello        | 1       | 1234567890 |
| world        | 1       | 2356480546 |
| bye          | 2       | 5168161543 |
|--------------|---------|------------|

SELECT * FROM comments WHERE page_id = 1 ORDER BY time_made DESC -- most recent first

Answer 2

最好将此字符串分成4个单独的字符串，并将其存储在单独的子表的4个不同的行中。