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Three important features of modern enterprise-scale relational databases stored procedures, functions, and triggers have been a part of this trend Stored procedures can perform database-related application processing within the database itself For example, a stored procedure might implement the application s logic to accept a customer order or to transfer money from one bank account to another Functions are stored SQL programs that return only a single value for each row of data Unlike stored procedures, functions are invoked by referencing them in SQL statements in almost any clause where a column name can be used This makes them ideal for performing calculations and data transformations on data to be displayed in query results or used in search conditions Nearly all relational DBMS products come with a set of vendor-supplied functions for general use, and therefore functions added by local database users are often called user-defined functions.

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Transact-SQL triggers can be specified to fire on any UPDATE for a target table, or just for updates of selected columns. This trigger fires on inserts or updates to the

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Triggers are used to automatically invoke the processing capability of a stored procedure based on conditions that arise within the database For example, a trigger might automatically transfer funds from a savings account to a checking account if the checking account becomes overdrawn This chapter describes the core concepts behind stored procedures, functions, and triggers, and their implementation in several popular DBMS brands The stored procedural SQL capabilities of the popular DBMS products have been significantly expanded in their major revisions during the late 1990s and 2000s A complete treatment of stored procedure, function, and trigger programming is well beyond the scope of this book, but the concepts and comparisons here will give you an understanding of the core capabilities and a foundation for beginning to use the specific capabilities of your DBMS software.

SALESREPS table and does different processing depending on whether the QUOTA or SALES column has been updated:

Stored procedures, functions, and triggers basically extend SQL into a more complete programming language, and this chapter assumes that you are familiar with basic programming concepts..

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create trigger upd_reps /* Update trigger for SALESREPS */ on salesreps for insert, update if update(quota) /* Handle updates to quota column */ . . . if update (sales) /* Handle updates to sales column */ . . .

Therefore, a combination of the MFR_ID and PRODUCT_ID columns must be used as the primary key of the PRODUCTS table Every product in the table is guaranteed to have a unique combination of data values in these two columns..

FIGURE 4-9

Informix also supports triggers through a CREATE TRIGGER statement. As in the Transact-SQL dialect, the beginning of the CREATE TRIGGER statement defines the trigger name, the table on which the trigger is being defined, and the triggering actions. Here are statement fragments that show the syntax:

Part I:

create trigger new_sls insert on salesreps . . . create trigger del_cus_chk delete on customers . . . create trigger ord_upd update on orders . . . create trigger sls_upd update of quota, sales on salesreps . . .

A column in one table whose value matches the primary key in some other table is called a foreign key In Figure 4-9, the REP_OFFICE column is a foreign key for the OFFICES table Although REP_OFFICE is a column in the SALESREPS table, the values that this column contains are office numbers They match values in the OFFICE column, which is the primary key for the OFFICES table Together, a primary key and a foreign key create a parent/child relationship between the tables that contain them, just like the parent/child relationships in a hierarchical database Just as a combination of columns can serve as the primary key of a table, a foreign key can also be a combination of columns In fact, the foreign key will always be a compound (multicolumn) key when it references a table with a compound primary key.

The last example is a trigger that fires only when two specific columns of the SALESREPS table are updated. Informix allows you to specify that a trigger should operate at three distinct times during the processing of a triggered change to the target table: I BEFORE. The trigger fires before any changes take place. No rows of the target table have yet been modified. I AFTER. The trigger fires after all changes take place. All affected rows of the target table have been modified.

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