So, what is new in Contacular since my last post? Quite a bit actually. It is now at version 0.15 and has the following additional features.

1. Fully bespoke, custom contact forms for your websites, allowing to define custom fields for your contact forms
2. File upload field type meaning your users can upload an image or document to your contact form and it will be quickly e-mailed to you
3. Ability to restrict file uploads to specific types for added security
4. Use of a PHP mailer class to increase flexibility instead of using the default PHP mail() function
5. Added multiple preset form types for near instant integrations.
6. Many code improvements and optimisations

For all other changes that have happened in Contacular, take a look at the Contacular change log.

I’m still getting lots of feedback in about Contacular and am continually working to improve it. So tell me what you think in the comments below, or contact me regarding Contacular directly.

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You can create a table with a check constraint in MySQL as follows. The check in this example disallows values of the ‘P_Id’ field from falling outside of the condition ‘P_Id>0′. In other words, the ‘P_Id’ field’s values must almost be greater than zero in order for the data to be accepted into the table by the database management system (DBMS).

CREATE TABLE Persons
(
P_Id int NOT NULL,
LastName varchar(255) NOT NULL,
FirstName varchar(255),
Address varchar(255),
City varchar(255),
CHECK (P_Id>0)
)

You are probably wondering how to add a constraint to an existing database table. This is quite easy, and uses an ‘ALTER TABLE’ SQL query. See the following example for how to add a check constraint to one of your existing database tables.

ALTER TABLE Persons
ADD CHECK (P_Id>0)

For more information, there are other highly useful example queries relating to SQL check constraints at the relevant SQL check constraint article on W3schools.

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