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The syntax of the DELETE command is actually very simple: DELETE FROM <table name> [WHERE <restrictive condition>] Most of the time, you ll want to use the WHERE clause to delete a single row: DELETE FROM department WHERE department_id = 43;
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CHAPTER 3 CREATING THE PRODUCT CATALOG: PART I
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As with UPDATE, be careful with this command because if you forget to specify a WHERE clause, you ll end up deleting all of the rows in the table. The following query deletes all the records in department. The table itself isn t deleted by the DELETE command. DELETE FROM department;
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Database functions are objects that store programs written in a language that PostgreSQL understands. PostgreSQL knows how to deal with functions written in more languages, such as Perl or Python, but we ll stick to the standard, which is an SQL-based language called PL/pgSQL. You can find an introduction to the language at http://www.postgresql.org/docs/ current/interactive/plpgsql.html#PLPGSQL-OVERVIEW. You don t need to use database functions if you want to perform database operations. You can directly send SQL commands from an external application (such as a PHP script of your HatShop application) to your PostgreSQL database. When using functions, instead of passing the SQL code you want executed, you just call the function and the values for any parameters it might have. Using functions for data operations has the following advantages: The performance can be better because PostgreSQL generates and caches the function s execution plan when it s first executed. Using functions allows for better maintainability of the data access and manipulation code, which is stored in a central place, and permits easier implementation of the three-tier architecture (the database functions forming the data tier). Security can be better controlled because PostgreSQL permits setting different security permissions for each individual function. SQL queries created ad hoc in PHP code are more vulnerable to SQL injection attacks, which is a major security threat. (Many Internet resources cover this security subject, such as the article at http://www.sitepoint.com/article/ sql-injection-attacks-safe.) This might be a matter of taste, but separating the SQL logic from the PHP code keeps the PHP code cleaner and easier to manage; it looks better to just query a function, than to join strings to build SQL queries to pass to the database. When developing HatShop, we ll save all the data access code as PostgreSQL functions inside the hatshop database. These functions, as functions in any respectable language, have input parameters and return types. In some of our examples, we ll define custom types for returning the results. The syntax for creating functions is CREATE FUNCTION <name>(<param1 type>, <param2 type> ... ) RETURNS [SETOF] <return type> LANGUAGE plpgsql AS $$ <code> $$ Alternatively, you can specify the language (LANGUAGE plpgsql) at the end of the function code, after the closing $$.
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CHAPTER 3 CREATING THE PRODUCT CATALOG: PART I
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Note that you can t create a function if your database already has a function with the same name and parameter number and types. You can, however, have multiple functions with the same name but different parameters (this method is called overloading in OOP [Object Oriented Programming] terminology). The key is that when calling the function, PostgreSQL must know which version of the function to call, and it can do that if the parameters are different. To change an existing function, you should use CREATE OR REPLACE FUNCTION instead of CREATE FUNCTION, which creates the function if it doesn t already exist or updates the function if it does exist. We ll use types to specify what kind of data the function returns. A type is defined like this: CREATE TYPE name AS ( attribute_name data_type [, ... ] ) For the data tier of the departments list, you need to create a type called department_list and a function called catalog_get_departments_list. Let s do this in the following exercise.
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