Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>I have this problem all the time. I've gone from using an auto-incremented primary to using an md5 hash most of the time. So while I haven't implemented this myself yet - no opportunity/need presently - you could do create a primary key (VARCHAR 32) that is an md5 hash of the first and last name. Like this:</p> <pre><code>$key = md5(strtolower($firstName . $lastName)); </code></pre> <p>Make the column this key goes into te primary key. Then you use an <code>INSERT IGNORE</code> and you can ignore any errors.</p> <p>Then you run a <code>SELECT</code> on the $key to return everything related to <code>$key</code>and display any info you have on the user in a friendly format. You don't have to show the user an error at that point, simply provide them with the info already captured. If you are worried about users with the same name seeing each other's data then the data can be obfuscated. For example instead of showing a phone number (333) 444-5555 you show (333) 444-5*<em>5 or (333) *</em>*-5555. Something that gives the user enough info to know if it is them or someone else with the same name.</p> <p>Typically I've used the <code>SELECT</code>, if empty <code>INSERT</code> and <code>SELECT</code> again, method. And it works but it is significantly slower than a simple <code>INSERT IGNORE</code> and then <code>SELECT</code>. I use a DAO I've built on top of PDO and the <code>INSERT IGNORE</code> works fine when a single column is the primary key. I have not tried it on a primary key based on more than 1 column nor have I tried it with the mysqli_* function.</p>
    singulars
    1. This table or related slice is empty.
    1. POPrevent duplicate records to a table using PHP
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USGabe Spradlin
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. COWow gabe, thanks for your thorough answer. It definitely gives me something to work towards. Thanks for the response I will have to give it a try ;-)
      singulars
      1. PO
      1. USAndy R
    2. CO@AndyR no problem. When I wrote this I didn't think I would need it but I'm in the middle of it right now. For example, I am capturing all of my AdWords campaigns and their status (Paused, Active, etc). Well typically I would put all the campaigns in one table, the statuses in another, and then create link table - camp2stat. However, the status can change over time and I'd like to store when it changed. So I now have a link table with a date not just the ID for the campaign and the ID for the status. However, I don't want to store the status for every day just when they change...
      singulars
      1. PO
      1. USGabe Spradlin
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload