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The EJBs execute on the application server within a container, which provides both a runtime environment for the beans and services for them. These range from general services, such as managing memory for the beans and scheduling their execution, to specific services like network access and database access (via JDBC). The container also provides persistence services, preserving the state of beans across activations. EJBs come in two major types that are of interest from a data management perspective. The EJB types are graphically illustrated in Figure 22-3. The two major types of beans are: I Session beans. These beans represent individual user sessions with the application server. Conceptually, there is a one-to-one association between each session bean and a current user. In the figure, users Mary, Joe, and Sam are each represented by their own session bean. If there are internal instance variables within the bean, these variable values represent the current state associated with the user during this particular session. I Entity beans. These beans represent business objects, and logically correspond to individual rows of a database table. For example, for entity beans representing sales offices, there is a one-to-one association between each entity bean and a particular office, which is also represented in our sample database by a single row in the OFFICES table. If there are internal instance variables within the bean, these variable values represent the current state associated with the office, which is also represented by the column values in this row of the OFFICES table. This state is independent of any particular user session. Either type of bean may access a database, but they will typically do it in quite different ways.

A session bean will typically access a database in a series of one or more JDBC calls on behalf of the user represented by the bean. An application server classifies session beans into two categories, depending on how the bean manages state: I Stateless session bean. This type of bean does not maintain any status information across method invocations. It carries out its actions on behalf of one user at a time, and one request at a time. Each request to the bean is independent of the last. With this restriction, every invocation of the bean must carry with it (in the form of the parameters passed with the invocation) all of the information needed to carry out the request. I Stateful session bean. This type of bean maintains status information across method invocations. The bean needs to remember information from its previous invocations (its state) to carry out the tasks requested by later invocations. It uses private instance variables to hold the information.

4

CLOB Character large object data with a maximum length of 2,147,483,647 bytes. DATE A date containing the YEAR, MONTH, and DAY elds. The year may range from 0001 through 9999, and the day must be valid for the particular year and month. DECIMAL A packed decimal or zoned decimal number with an implicit decimal point. Values range from 1031 + 1 through 1031 1. DOUBLE PRECISION (DOUBLE) A double-precision oating-point number (approximate data type) that can be zero or in the range 7.2 1075 through 5.4 10 79 or in the range +5.4 10 79 through +7.2 1075. INTEGER An integer number in the range 2,147,483,648 through 2,147,483,647. NUMERIC Implemented the same as DECIMAL. REAL A single-precision oating-point number (approximate data type) that can be zero or in the range 3.4 1038 through 1.17 10 37 or in the range +1.17 10 37 through +3.4 1038. SMALLINT An integer number in the range 32,768 through 32,767. TIME A time containing the HOUR, MINUTE, and SECOND elds using a 24-hour clock. TIMESTAMP A combined date and time containing the YEAR, MONTH, DAY, HOUR, MINUTE, and SECOND elds. The year may range from 0001 through 9999, and the day must be valid for the particular year and month. The time component uses a 24-hour clock. VARCHAR Variable-length character data with a maximum length of 32,672 characters. The IBM DB2 Universal Database offers the following extensions to the standard data types: DBCLOB Similar to an NCLOB, a double-byte character large object with a maximum length of 1,073,741,823 characters. GRAPHIC A xed-length double-byte character string with a maximum length of 127 characters. VARGRAPHIC A variable-length double-byte character string with a maximum length of 16,336 characters.

Figure 22-3.