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Links
SQL Developers Guide: Database Structure
The Links SQL database is made up of several tables. The main three
tables that hold all the data are: Links, Category and
Users. The definition
of the tables are show below. They use mysql syntax for the types, but
GT::SQL will map these to the best type in other databases.
The tables are joined
together as follows:
Note: These
represent the core tables. There are a few other for managing mailing lists
and tracking the status of links, but these are the primary ones.
The
descriptions for the main three tables are below:
| Links |
| Column |
Type |
Notes |
| ID |
INT |
Primay Key, auto incremented integer |
| Title |
CHAR(100) |
Title of the link |
| URL |
CHAR(255) |
URL of the link |
| LinkOwner |
CHAR(50) |
Foreign key to Users table. Represents
user who owns this link. |
| Add_Date |
DATE |
Date the link was added |
| Mod_Date |
DATE |
Date the link was last changed |
| Description |
TEXT |
A description about the link |
| Hits |
SMALLINT |
Number of time the link has been clicked
on |
| isNew |
ENUM('Yes','No') |
Flag saying whether the link is new |
| isChanged |
ENUM('Yes','No') |
Flag saying whether the link has changed |
| isPopular |
ENUM('Yes','No') |
Flag saying whether the link is popular |
| isValidated |
ENUM('Yes','No') |
Flag saying whether the link has been
validated |
| Rating |
FLOAT |
Current rating of link |
| Votes |
SMALLINT |
Total number of votes cast |
| Status |
SMALLINT |
Status of link (HTTP Status code 200 =>
OK, 404 => Not found, etc) |
| Date_Checked |
DATETIME |
Last time the link has been checked |
| Timestmp |
TIMESTAMP |
Timestamp of last time link was modified. |
| Category |
| Column |
Type |
Notes |
| ID |
INT |
Primary
Key, Auto Incremented integer |
| Name |
CHAR(255) |
Name of
the category |
| FatherID |
INT |
ID Number
of parent category, 0 for a root level category. |
| Full_Name |
CHAR(255) |
A slash
(/) separated list of category name. i.e. if the category is named
Video Cards and is in Hardware which is in Computers, then Full_Name
would be Computers/Hardware/Video_Cards |
| Description |
TEXT |
Optional
description used in category listings. |
| Meta_Description |
TEXT |
Optional
meta description for generated HTML pages |
| Meta_Keywords |
TEXT |
Optional
meta keywords for generated HTML pages. |
| Header |
TEXT |
Optional
category header |
| Footer |
TEXT |
Optional
category footer |
| Number_of_Links |
INT |
Total
count of all links in this category and subcategories |
| Has_New_Links |
ENUM('Yes','No') |
Flag
telling whether there are any new links anywhere within this category. |
| Has_Changed_Links |
ENUM('Yes','No') |
Flag
telling whether there are any changed links anywhere within this
category. |
| Newest_Link |
DATE |
The date
of the most current link within this category tree. |
| Timestmp |
TIMESTAMP |
Auto
generated timestamp of the last time this record was updated. |
| Category_Template |
CHAR |
Contains the
name of a custom template to use, or template set to use when displaying a category. |
| Users |
| Column |
Type |
Notes |
| Username |
CHAR(50) |
Primary
key representing the users login name |
| Password |
CHAR(25) |
Users
password (default is not encrypted) |
| Email |
CHAR(75) |
Email
address |
| Name |
CHAR(75) |
Real Name |
| Validation |
CHAR(20) |
Optional
validation code that gets sent to users email to ensure its a real
email address. |
| Status |
ENUM('Not
Validated', 'Registered','Administrator') |
Flag
saying what class of user this is. |
| ReceiveMail |
ENUM('Yes','No') |
Flag
saying whether the user should get any email or not. |
| Newsletter |
ENUM('Yes','No') |
Flag
saying whether the user is subscribed to the newsletter or not. |
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