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The select methods use a newly defined EJB 20 Query Language (EJBQL) While the query language is based on SQL-92, it includes constructs such as path expressions that are decidedly nonrelational Finally, EJB 20 was designed to align with the SQL:1999 standard and its abstract data types Support for these types somewhat simplifies the interaction between entity beans and the database for DBMS products that support abstract types At this time, few DBMS products support them..

The FOR EACH ROW clause specifies the action to be taken as each affected row is updated. In this case, the requested action is an INSERT into one of two order-tracking tables, depending on whether the order amount is being increased or decreased. These tracking tables contain the customer number, date, and both the old and new order amounts. To obtain the required values, the trigger must be able to refer to both the old (prechange) and the new (postchange) values of each row. The REFERENCING clause provides names by which these two states of the row currently being modified in the ORDERS table can be used. In this example, the prechange values of the columns are available through the column name qualifier PRE, and the postchange values are available through the column name qualifier POST. These are not special names; any names can be used. Informix is more limited than some other DBMS brands in the actions that can be specified within the trigger definition itself. These statements are available: INSERT DELETE UPDATE EXECUTE PROCEDURE In practice, the last option provides quite a bit of flexibility. The called procedure can perform almost any processing that could be done inline within the trigger body itself.

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SQL is offered by all of the leading DBMS vendors, and no new database product over the last decade has been highly successful without SQL support. A SQL-based database and the programs that use it can be moved from one DBMS to another vendor s DBMS with minimal conversion effort and little retraining of personnel. Database tools, such as query tools, report writers, and application generators, work with many different brands of SQL databases. The vendor independence thus provided by SQL was one of the most important reasons for its early popularity and remains an important feature today.

Oracle provides a more complex trigger facility than either the Informix or Transact-SQL facility described in the preceding sections. It uses a CREATE TRIGGER statement to specify triggered actions. As in the Informix facility, a trigger can be specified to fire at specific times during specific update operations: Statement-level trigger A statement-level trigger fires once for each data modification statement. It can be specified to fire either before the statement is executed or after the statement has completed its action. Row-level trigger A row-level trigger fires once for each row being modified by a statement. In Oracle s structure, this type of trigger may also fire either before the row is modified or after it is modified. Instead-of trigger An instead-of trigger takes the place of an attempted data modification statement. It provides a way to detect an attempted UPDATE, INSERT, or DELETE operation by a user or procedure, and to substitute other processing instead. You can specify that a trigger should be executed instead of a statement, or that it should be executed instead of each attempted modification of a row. System event trigger A trigger that fires when a particular system event takes place, such as a user connecting to the database, or entry of a database shutdown command.

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Part VI:

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The following code is a PL/SQL trigger definition that implements the same processing as in the complex Informix example from the previous section. It has been split into three separate Oracle CREATE TRIGGER statements; one each for the BEFORE and AFTER statement-level triggers and one trigger that is executed for each update row.

SQL-based database products run on computer systems ranging from mainframes and midrange systems to personal computers, workstations, a wide range of specialized server computers, and even handheld devices. They operate on stand-alone computer systems, in departmental local area networks, and in enterprisewide or Internetwide networks. SQL-based applications that begin on single-user or departmental server systems can be moved to larger server systems as they grow. Data from corporate SQL-based databases can be extracted and downloaded into departmental or personal databases. Finally, economical personal computers can be used to prototype a SQL-based database application before moving it to an expensive multiuser system.

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