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Now we re looking at over 10 seconds elapsed time for all threads. That s significantly slower than the test using object pooling. In this manufactured example, object pooling does improve overall performance. What follows is the implementation of the same object-pooling component in Visual Basic .NET (VB.NET). We start with the public interface: Public Interface IObjectPoolingMethods Function LookupKeyCode(ByVal key As String) _ As Integer End Interface Here is the class that implements this interface: Imports System.Collections Imports System.Runtime.InteropServices Imports System.EnterpriseServices <ObjectPooling(30, 100)> _ <JustInTimeActivation()> _ <EventTrackingEnabled()> _ <ClassInterface(ClassInterfaceType.None)> _ Public Class DniScObjectPoolingObj Inherits ServicedComponent Implements IObjectPoolingMethods Private m_KeyCodes As Hashtable

A correct sequence must be followed when dropping constraints, since both PRIMARY KEY and CHECK constraints are likely to have dependencies.

To find the names of constraints, it may be helpful to define and commit the four system views defined in the script system_views.sql provided in Appendix IX.

< php // Example 10-7-4.php function ShowSimple($val) { echo "$val\n"; } function ShowComplex($val) { echo "The value is " . number_format($val) . "\n"; } $v = 1234567; $a = "ShowSimple"; $b = "ShowComplex"; $a($v); $b($v); >

When a primary key or unique constraint is to be dropped, it will be necessary first to find and drop any foreign key (FK) constraint that references it. If it is a unique key, the FK declaration actually names the columns of the unique constraint, for example:

... FK_DATA_ID FOREIGN KEY DATA_ID REFERENCES TEST_UQ(DATA_ID);

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Public Sub New() 'simulate the cost of object construction. 'this might represent the time needed to 'retrieve and locally cache selected 'values from a database or other source. System.Threading.Thread.Sleep(100) 'build an in-memory cache of frequently 'used data. In a live application, this 'might be populated from a database query. m_KeyCodes = New Hashtable() m_KeyCodes.Add("AAA", 11111) m_KeyCodes.Add("BBB", 22222) m_KeyCodes.Add("CCC", 33333) m_KeyCodes.Add("DDD", 44444) m_KeyCodes.Add("EEE", 55555) End Sub <AutoComplete()> _ Public Function LookupKeyCode(ByVal key As String) _ As Integer _ Implements IObjectPoolingMethods.LookupKeyCode Dim result As Integer = 0 If m_KeyCodes.Contains(key) Then result = m_KeyCodes.Item(key) Else 'not in the local cache, so we need to 'retrieve it from the database End If End Function Protected Overrides Function CanBePooled() As Boolean 'override the base method in order to allow 'pooling of this object Return True End Function End Class The usual set of assembly-level attributes are added to the AssemblyInfo.vb file: Imports System.EnterpriseServices <Assembly: <Assembly: <Assembly: <Assembly: ApplicationActivation(ActivationOption.Server)> ApplicationAccessControl(False)> ApplicationName("DniServerApplication")> Description(".NET Interop Server Application")>

If the referenced key is the primary key, the name of the primary key column is optional in FK declarations and is often omitted. For example, looking at the ../samples/ employee.gdb database:

You define two functions and assign the names of each function to a variable. When the new variables are written as $a($v);, the system will convert $a to a function name and call that function. 1234567 The value is 1,234,567

...TABLE PROJECT ( ..., TEAM_CONSTRT FOREIGN KEY (TEAM_LEADER) REFERENCES EMPLOYEE );

Dropping a foreign key constraint is usually straightforward:

ALTER TABLE PROJECT DROP CONSTRAINT TEAM_CONSTRT; COMMIT;

You can use this method to return the function name from a function call or calculation. It might make the code less readable, and you can obtain the same effect by adding an extra parameter to one function so it will be able to handle both simple and complex printing.

The test results using the VB.NET component look exactly like those using the one written in C#.

After that, it becomes possible to drop the primary key (PK) constraint on the EMP_NO column of the EMPLOYEE table:

ALTER TABLE EMPLOYEE DROP CONSTRAINT EMP_NO_CONSTRT;

Any CHECK conditions that were added during table definition can be removed without complications. CHECK conditions inherited from a domain are more problematic. To be free of the domain s constraints, it will be necessary to perform an ALTER TABLE ALTER COLUMN...TYPE operation to change the column to another data type or domain.

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