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PostgreSQL allows you to use complex rules in the database structure As mentioned earlier, under the consistency test, a rule performs a function on one or more tables based on an event occurring in a table Developers use rules when they need to modify data in more than one table based on a single action The example of updating a Billing table based on adding a record to the Order table is a good example The rule is responsible for adding the record to the Billing table whenever a record is added to the Order table In PostgreSQL there are two types of rules: Do rules Do instead rules Do rules are commands that are performed in addition to the original command submitted by the database user Do instead rules replace the original command submitted by the user with a predetermined set of rules Do instead rules provide a great tool for the database administrator to control what users can do to data in the database Often rules are created to prevent users from manipulating records they shouldn t be messing with
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Besides rules, PostgreSQL also supports triggers A trigger is a set of instructions that is preformed on data based on an event in the table that contains the data There are three types of table events that can cause a trigger to activate: Inserting a new row in a table Updating one or more rows in a table Deleting one or more rows in a table A trigger differs from a rule in that it can only modify data contained in the same table that is being accessed Triggers are most often used to check or modify data that is being entered into a table, such as the earlier example of ensuring each customer record contains a phone number
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Support for Binary Large Objects (BLOBs)
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Most database users are familiar with the common types of data that can be stored in databases These include integers, Boolean values, fixed-length character strings, and variable-length character strings However, in the modern programming world, support for lots of other data types is necessary It is not uncommon to see applications that are used to store and index pictures, audio clips, and even short video clips This type of data storage has forced most professional database systems to devise a plan to store different types of data
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PostgreSQL uses a special data type called the Binary Large Object (BLOB) to store multimedia data A BLOB can be entered into a table the same as any other data type This allows developers to include support for multimedia storage within applications Caution should be taken, though, when using BLOBs, as they can quickly fill a database disk space as the BLOB images are stored in the table
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User-Defined Types
If BLOBs don t get you what you want, PostgreSQL also allows you to roll your own data types Creating your own data types is not for the faint of heart It requires creating C language subroutines defining how PostgreSQL handles the user-defined data type Functions must be created for defining how data is both input into the system by the user, and output by the system The output function must be able to display the userdefined data type as a string The input function accepts string characters from the user and converts them into the user-defined data type The most common example used for a user-defined data type is complex numbers A complex number consists of a pair of floating-point numbers, representing the X and Y value (such as the value (325, 400)) The C language input function converts the string representation of the value into the appropriate floating-point values Likewise, the output function converts the floating-point values into the string representation
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