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Listing 4-14. FullTimeEmployee.java, a Concrete Leaf Entity in a TABLE_PER_CLASS Inheritance Hierarchy

1. 2.

/* * FullTimeEmployee: A concrete leaf entity */ @Entity @NamedQuery(name = "FullTimeEmployee.findAll", query = "select o from FullTimeEmployee o") @Table(name = "CH04_TPC_FT_EMPLOYEE") public class FullTimeEmployee extends Employee implements Serializable { /* The class body is identical across all inheritance strategies */ }

YourCompany_GetTimePunchs OK, so you may be asking, What s with the s at the end of this stored procedure name This does not have the ItemID passed in as an argument. It is also not searching for records based on the ItemID. Since it is the ItemID that makes the row unique, you will get all punches for all people entered in through this ModuleID hence the s. The code for this is as follows:

Listing 4-15. PartTimeEmployee.java, a Concrete Leaf Entity in a TABLE_PER_CLASS Inheritance Hierarchy

1. 2.

ALTER procedure dbo.YourCompany_GetTimePunchs @ModuleId int as select ModuleId, ItemId, Content, CreatedByUser, CreatedDate, 'CreatedByUserName' = Users.FirstName + ' ' + Users.LastName from YourCompany_TimePunch inner join Users on YourCompany_TimePunch.CreatedByUser = Users.UserId where ModuleId = @ModuleId

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/* * PartTimeEmployee: A concrete leaf entity */ @Entity @NamedQuery(name = "PartTimeEmployee.findAll", query = "select o from PartTimeEmployee o") @Table(name = "CH04_TPC_PT_EMPLOYEE") public class PartTimeEmployee extends Employee implements Serializable { /* The class body is identical across all inheritance strategies */ }

Forgetting for a moment about the wrong field names, you do not want to get all punches for everyone. The TimePunch module should show data only for one person. While the code can get all the punches and troll through them to weed out what you want, it is best to let the database handle this. You need another qualifier to further filter the result. This qualifier will be the UserID. Here is the stored procedure, with the new code in bold:

The Address class in the TABLE_PER_CLASS example is identical to the previous examples, aside from the table and sequence names we have chosen.

1. 2.

Table 4-3 offers a look at some of the strengths and weaknesses of the TABLE_PER_CLASS entity inheritance strategy.

ALTER procedure dbo.YourCompany_GetTimePunchs @ModuleId int, @UserId int as select ModuleId, Punch_User, Punch_Type, Punch_Date, 'Punch_UserName' = Users.FirstName + ' ' + Users.LastName from YourCompany_TimePunch inner join Users on YourCompany_TimePunch.Punch_User = Users.UserId where ModuleId = @ModuleId and Punch_User = @UserId

As new outermost concrete types are introduced into the hierarchy, new tables are added. This is nice because no existing tables (nor their data) need be aware. However, since each type maps all of its supertype fields as well, introducing a new field on a base class, or a new base entity itself, requires modifying the tables for all affected subtypes across the hierarchy to map any newly introduced fields. Querying across multiple types requires a UNION select statement, which is not very performant, but querying a single type is very efficient, since only one table is involved in the query. Relationships involving supertypes in this hierarchy should be avoided, since they will necessarily require this UNION operation to resolve to concrete subtype instances.

1. 2.

Notice that the extra qualifier with an and logical operator has been added at the end of this SQL statement. The result will now be filtered by the ItemID and the Punch_User value.

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