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When a new Resource object is created and saved, its data needs to be inserted into the Resources table. CREATE PROCEDURE addResource ( @lastName varchar(50), @firstName varchar(50), @newId int output, @newLastChanged timestamp output )
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AS INSERT INTO Resources (LastName,FirstName) VALUES (@lastName,@firstName) SELECT @newId = Id, @newLastChanged = LastChanged FROM Resources WHERE Id=SCOPE_IDENTITY() RETURN Remember that the Id column in the Resource table is an identity column. This means its value is automatically assigned by the database when a new row is inserted. The built-in SCOPE_IDENTITY() function is used to retrieve the generated key value, and that value is returned in an output parameter as a result of the stored procedure. In 18, you ll see how this value is retrieved by the Resource object so that the object becomes aware of the new value. Also, as in addProject, the new value for the LastChanged column is returned to the object. The associated addAssignment procedure, which can be used to add related records to the Assignments table, was created earlier.
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Likewise, there s a need to update data in the Resources table, as shown here: CREATE PROCEDURE updateResource ( @id int, @lastName varchar(50), @firstName varchar(50), @lastChanged timestamp, @newLastChanged timestamp output ) AS UPDATE Resources SET LastName=@lastName, FirstName=@firstName WHERE Id=@id AND LastChanged=@lastChanged IF @@ROWCOUNT = 0 RAISERROR('Row has been edited by another user', 16, 1) SELECT @newLastChanged = LastChanged FROM Resources WHERE Id=@id RETURN This procedure will be called when an existing Resource object is edited and saved.
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A Resource object can be removed from the system. This means removing not only the record from the Resources table, but also the associated records from the Assignments table, as shown here:
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CREATE PROCEDURE deleteResource ( @id int ) AS DELETE Assignments WHERE ResourceId=@id DELETE Resources WHERE Id=@id RETURN This procedure works the same as deleteProject.
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getRoles
The getRoles procedure will return the list of roles to populate the RoleList and Roles objects as follows: CREATE PROCEDURE [dbo].[getRoles] AS SELECT Id,Name,LastChanged FROM Roles RETURN All the role data is returned as a result of this procedure. Though RoleList and Roles use the data differently, they both use the same set of values.
addRole
The addRole procedure adds a new entry to the Roles table. CREATE PROCEDURE [dbo].[addRole] ( @id int, @name varchar(50), @newLastChanged timestamp output ) AS INSERT INTO Roles (Id,Name) VALUES (@id,@name) SELECT @newLastChanged = LastChanged FROM Roles WHERE Id=@id RETURN The Role object calls this stored procedure when it needs to insert its data into the database. As with the other add procedures, this one returns the new value of the LastChanged column for use by the business object.
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updateRole
The updateRole procedure updates an existing entry in the Roles table. CREATE PROCEDURE [dbo].[updateRole] ( @id int, @name varchar(50), @lastChanged timestamp, @newLastChanged timestamp output ) AS UPDATE Roles SET Name=@name WHERE Id=@id AND LastChanged=@lastChanged IF @@ROWCOUNT = 0 RAISERROR('Row has been edited by another user', 16, 1) SELECT @newLastChanged = LastChanged FROM Roles WHERE Id=@id RETURN The Role object calls this stored procedure when it needs to update the data in the database.
deleteRole
The deleteRole procedure removes an entry from the Roles table. CREATE PROCEDURE [dbo].[deleteRole] ( @id int ) AS DELETE Roles WHERE Id=@id RETURN The Role object calls this stored procedure when it needs to remove a row of data from the database. At this point, stored procedures exist to do every bit of data access. In 18, the business objects will implement data access code using LINQ to SQL that makes use of these stored procedures.
Security Database
With the PTracker database complete, let s wrap up the chapter by creating the tables and stored procedures for the Security database. The PTIdentity object will use this database to perform custom authentication of a user s credentials. Assuming the user is valid, the user s roles will be loaded into the business object so they can be used for authorization as the application is used. The PTPrincipal and PTIdentity objects will be implemented in 17. In most cases, you ll be creating similar custom security objects but designed to use your preexisting security database tables. The database created in this chapter and the objects created in s 17 and 18 exist primarily to demonstrate the basic process required for creating your own objects.
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