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'Sir Lancelot' This means that you have to worry about the contents of globalName when you use instances (objects) of the class OpenObject. In fact, you have to make sure that nobody changes it: >>> globalName = 'Sir Gumby' >>> o.getName() 'Sir Gumby' Things get even more problematic if you try to create more than one OpenObject because they will all be messing with the same variable: >>> o1 = OpenObject() >>> o2 = OpenObject() >>> o1.setName('Robin Hood') >>> o2.getName() 'Robin Hood' As you can see, setting the name of one automatically sets the name of the other. Not exactly what you want. Basically, you want to treat objects as abstract. When you call a method you don t want to worry about anything else, such as not disturbing global variables. So how can you encapsulate the name within the object No problem. You make it an attribute. Attributes are variables that are a part of the object, just like methods; actually methods are almost like attributes bound to functions. (You ll see an important difference between methods and functions in the section Attributes, Functions, and Methods, later in this chapter.) If you rewrite the class to use an attribute instead of a global variable, and you rename it ClosedObject, it works like this: >>> c = ClosedObject() >>> c.setName('Sir Lancelot') >>> c.getName() 'Sir Lancelot' So far, so good. But for all you know, this could still be stored in a global variable. Let s make another object: >>> r = ClosedObject() >>> r.setName('Sir Robin') r.getName() 'Sir Robin' Here we can see that the new object has its name set properly. Well, we expected that. But what has happened to the first object now >>> c.getName() 'Sir Lancelot'

Method upload is used to start an upload process that is, a process to move data from staging tables to an application s tables. This is where you code all your groovy data processing. Here s an example of the method from package WEEKLY_INTERFACE: PROCEDURE upload is -- Add cursor(s) used to loop through the staging data here. begin pl('Executing upload()'); if is_verified() then -- Add your data migration code here. set_uploaded(); end if; end upload; And last, but not least, is set_uploaded.

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Now that we have a simple Address POJO class and the corresponding mapping, we just need to create a new ADDRESS table in the database. Listing 4-3 shows the SQL statement to create the ADDRESS table. Listing 4-3. SQL Create Statement for Table ADDRESS CREATE TABLE ADDRESS ( PK_ID INTEGER NOT NULL PRIMARY KEY AUTO_INCREMENT, STREETADDRESS VARCHAR(64), APTNUMBER VARCHAR(32), CITY VARCHAR(32), STATE CHAR(2), ZIPCODE VARCHAR(10) ); Figure 4-12 shows the MySQL Command Line Client displaying the list of commands needed to create the TechConf database instance and the Address table. Note that we could have chosen to let Hibernate create the table at application start-up time by configuring the hbm2ddl tool via the Hibernate configuration. The hbm2ddl tool generates a schema based on the loaded HBM files which Hibernate will use to create or update the database if necessary.

Method set_uploaded is used to set the status of the upload process to complete. Supporting table package s PROCEDURE WEEKLY_INTERFACE_STATUS.set_uploaded is called from inside upload, if the upload method completes successfully. The following is an example of the method from supporting table package WEEKLY_ INTERFACE_STATUSS: PROCEDURE set_uploaded is pragma autonomous_transaction; begin update WEEKLY_INTERFACE_STATUS set upload_date = SYSDATE, update_user = USER, update_date = SYSDATE where weekly_interface_status_id = WEEKLY_INTERFACE_STATUSS.get_week();

The name is still there! What I have done is give the object its own state. The state of an object is described by its attributes (like its name, for example). The methods of an object may change these attributes. So it s like lumping together a bunch of functions (the methods) and giving them access to some variables (the attributes) where they can keep values stored between function calls.

if nvl(sql%rowcount, 0) = 0 then insert into WEEKLY_INTERFACE_STATUS ( weekly_interface_status_id, upload_date ) values ( WEEKLY_INTERFACE_STATUSS.get_week(), SYSDATE ); end if; commit; end set_uploaded; Using the WEEKLY_INTERFACE package as a framework for your database destination interfaces, you can provide a consistent treatment to all interfaces and at the same time have the freedom to perform each high-level step in a manner that is suitable for solving the associated business requirements. Next, let s look at the polymorphic use of method names in support of the reporting presentation layer.

Notice that we have selected the primary key field to be a MySQL AUTO_INCREMENT field. This is one case of a mapping in which the object property is optional but the table column is not. Remember, Hibernate mappings are class-centric. But in the case of the database identifier you can choose not to have the database identity reflected in your POJO classes. Although having a database ID field might seem like a leakage of concerns, it is highly recommended that you have one, since many of Hibernate s advanced features, such as the ability to use detached objects and the useful saveOrUpdate and merge methods of the Session object, depend on having the database identity reflected in your POJOs. You can minimize the impact of your POJO design by intelligently using the appropriate Java class member visibility when declaring your identity fields. In an ORM tool it is important to know the persistent state of an object. Having a nullable, non-primitive primary key makes the job of knowing whether an object needs to be saved or updated much easier. Therefore in all examples we will typically use a surrogate integer primary key, and whenever possible we will rely on the database to generate new values for new objects.