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= 'T';
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-- Show the object's values pl('o_worker_type.id pl('o_worker_type.code pl('o_worker_type.description pl('o_worker_type.active_date pl('o_worker_type.inactive_date -- Delete the test object delete WORKER_TYPE_OT where code = 'T';
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= = = = =
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'||o_worker_type.id); '||o_worker_type.code); '||o_worker_type.description); '||o_worker_type.active_date); '||o_worker_type.inactive_date);
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-- This time insert the test object using the instance variable insert into WORKER_TYPE_OT values ( o_worker_type ); -- Last, delete the object from the relational table delete WORKER_TYPE_T where code = 'T'; -- Commit all these operations commit; -- Confirm that the test completed successfully pl('Test completed successfully.'); end; / The results of the test unit in Listing 6-9 should look something like this:
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SQL> @worker_type_ot o_worker_type.id o_worker_type.code o_worker_type.description o_worker_type.active_date o_worker_type.inactive_date Test completed successfully. = 112 = T = Test = 20070223 155157 = 20070223 155157
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PL/SQL procedure successfully completed. Come on, you have to admit it. It s pretty easy to make a transition to object orientation, right Perhaps, or perhaps not. Some argue that there is a problem between how object-oriented languages represent data and how data is stored in a relational database, calling it an impedance mismatch.
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CH APT ER 6 JUST LI KE IT IS I N T HE REAL WO RLD !
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Impedance Mismatch My Foot!
I argue that if done properly, there is little so-called mismatch between the classes used in an object-oriented language like Java and object-relational user-defined types in Oracle that is, if they both properly model the real world. I have an entire section dedicated to the use of Java Database Connectivity (JDBC) and object-relational user-defined types in one of my previous books (Java Programming with Oracle JDBC). My 20 plus years of experience in both programming with object-oriented languages and using relational and now object-relational databases has led me to the conclusion that the mismatch is one of improper analysis vs. the reality of the problem domain. The only time I see a mismatch is when one of the following occurs: Catchall classes are used in the presentation layer that make it easy to represent and move objects around in the presentation layer, but they don t actually model the real world at all. Denormalized attributes in classes that once again make it easier to work with data in the presentation layer, but don t even remotely represent the cardinality of the real world. No time is taken to do a proper analysis. It s build a presentation and then create a database that fits it, or restated, shoot, ready, aim! Right. Target databases use a different programming language from the presentation layer s object-oriented programming environment, so the database programming language is misunderstood, misused, or ignored altogether. Don t take these in any particular order, because there are more reasons than I am willing to list. I seem to remember the same phenomena you know, all the reasons not to adopt better technology years ago when relational technology first appeared, say 1984 So what haven t I told you There are, in fact, a few topics I have not covered yet. Let s delve into those next.
Nested Types and Collections
First, I haven t shown any examples with nested types. For example, I could create a TYPE ADDRESS_O for address information, and then use that TYPE as an attribute in another TYPE like CONTACT_O. You can do that; it s not a problem. Nor have I shown you any examples of a TYPE that contain arrays of other TYPEs. That s certainly possible. You can create what is called a nested TYPE, and implement it as a nested table where you can have an unlimited number of entries, or as a varying array that has a fixed number of entries. I don t like the sound of the latter. It s not very relational in nature. And nesting is where all the so-called impedance mismatch occurs. In the minds of some object-oriented programmers, it s necessary to create huge, complex, object types that contain everything remotely similar. You know, if you re an object-oriented programmer, you ve seen them, or worse, created them. Consider Figure 6-1, a class diagram to replace the ERD for our problem domain from 1. Are all three historical entities LocgicalAssignment, PhysicalAssignment, and WorkAssignment part of Worker in an object-oriented setting No, they may be related, but you won t find them on any particular worker, will you They are actually stand-alone entities.
C HA PTER 6 JUS T LIK E IT IS IN THE REA L WORLD!
However, in most cases, someone would create a class Worker that contained these three entities as arrays. There s the mismatch. It s a break between reality and programming convenience.
WorkerType +workerTypeId +code +description +activeDate +inactiveDate +getId() +getId() +getCodeDescr() +getCodeIdDescr() +getCodeIdDescr() +help() +test() +toString() Worker +workerId +workerTypeId +externalId +firstName +middleName +lastName +birthDate +genderId +getAge() +getAge() +getBirthDate() +getExternalId() +getFormattedName() +getId() +getId() +getRow() +getUnformattedName() +help() +isDuplicate() +setRow() +test() +toString() 1..1 1..1
Gender +genderId +code +description +activeDate +inactiveDate +getId() +getId() +getCodeDescr() +getCodeIdDescr() +getCodeIdDescr() +help() +test() 0..* +toString()
1..*
1..* 0..1
WorkAssignment +workAssignmentId +workerId +workId +activeDate +inactiveDate +getId() +getRow() +getWork() +getWork() +help() +isActive() +isHistory() +setRow() +test() 0..*
LogicalAssignment +logicalAssignmentId +workerId +logicalWorkplaceId +activeDate +inactiveDate +getId() +getLogicalWorkplace() +getLogicalWorkplace() +getRow() +help() +isActive() +isHistory() +setRow() +test() 0..* 1..1 LogicalWorkplace +logicalWorkplaceId +parentId +idContext +workplaceTypeId +code +name +activeDate +inactiveDate +createIdContext() +getId() +getCodeContext() +getNameContext() +getRow() +help() +setRow() +test() +toString()
PhysicalAssignment +phyiscalAssignmentId +workerId +physicalWorkplaceId +activeDate +inactiveDate +getId() +getLogicalWorkplace() +getLogicalWorkplace() +getRow() +help() +isActive() +isHistory() +setRow() +test() 0..* 1..1
0..*
0..*
1..1 Work +workId +code +name +activeDate +inactiveDate +getId() +getRow() +help() +setRow() +test() +toString()
WorkPlaceType +workerTypeId +logicalIndicator +physicalIndicator +code +description +activeDate +inactiveDate +getId() +getId() +getCodeDescr() +getCodeIdDescr() +getCodeIdDescr() +help() +test() +toString()
PhysicalWorkplace +physicalWorkplaceId +parentId +idContext +workplaceTypeId +code +name +activeDate +inactiveDate +createIdContext() +getId() +getCodeContext() +getNameContext() +getRow() +help() +setRow() +test() +toString()
0..1 1..1
1..1 0..1
0..1 1..*
0..1 1..*
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