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Here is our first attempt at using this class from a client application: using System; using DniScPrivateComponent; static void Main(string[] args) { //try the private object try { IAccountServices obj = new DniScPrivateObj(); int acctId = obj.FindAccount("MyAccountName"); Console.WriteLine( "FindAccount results: {0}", acctId); } catch (Exception e) { Console.WriteLine( "Exception accessing DniScPrivateObj: {0}", e.Message); } Console.Read(); } When we run this test it should fail, since the component is marked private to all code outside of the application. Here are the results we receive: Exception accessing DniScPrivateObj: Access is denied because the component is private. (Exception from HRESULT: 0x80110821) Now let s try to use this component from another class in the same application. Here is a C# interface and class that does just that: public interface IPublicAccountServices { int UpdateAccountStatus(string searchArg); } [ClassInterface(ClassInterfaceType.None)] public class DniScPublicObj : ServicedComponent, IPublicAccountServices { public int UpdateAccountStatus(string searchArg) {

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In the child structure, we need to include a column, PARENT_ID, that exactly matches the primary key of the parent in type and size (and also column order, if the linkage involves multiple columns):

Opens or creates a memory block for sharing Closes a shared memory block Deletes a shared memory block Reads data from a shared memory block Writes data to a shared memory block Gets the size of a shared memory block

CREATE TABLE CHILD ( ID BIGINT NOT NULL, CHILD_DATA VARCHAR(20), PARENT_ID BIGINT, CONSTRAINT PK_CHILD PRIMARY KEY(ID)); COMMIT;

The next thing to do is declare the relationship between the child and the parent by means of a FOREIGN KEY constraint.

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int acctId = 0; DniScPrivateComponent.IAccountServices privateObj = new DniScPrivateComponent.DniScPrivateObj(); acctId = privateObj.FindAccount(searchArg); if (acctId > 0) { privateObj.ChangeActiveStatus(acctId, false); } return acctId; } } We ve designed this class to be the public API that clients can use. This is effectively a public wrapper for the private class, hiding the implementation details of how the private class is used. When the UpdateAccountStatus method is called, it creates an instance of the private class and uses it. Since both of these classes are installed into the same COM+ application, this call is allowed. To test this, we can rewrite the client code to use this new class instead of the private one: using System; using DniScPrivateComponent; static void Main(string[] args) { //try the public object IPublicAccountServices publicObj = new DniScPublicObj(); int updateAcctId = publicObj.UpdateAccountStatus("MyAccountName"); Console.WriteLine( "UpdateAccountStatus results: {0}", updateAcctId); Console.Read(); } This time when we execute the test code, we have a successful result: UpdateAccountStatus results: 2001

The syntax pattern for a referential integrity definition is as follows:

You must create a shared memory block before you can use it. You can use the shmop_open() function to do this; this function takes four arguments. The first is a unique ID (an integer) used to identify the memory block. The second parameter is a flag that specifies how the block is accessed (a = read-only, c = create or read/write, w = write and read, and n = create new or fail). The third argument specifies the access to the memory block and should be passed as an octal such as file system rights (for example, 0644). The fourth and last argument sets the size of the block. The third and fourth arguments should be set to 0 if you are opening an existing block.

... FOREIGN KEY (column [, col ...]) REFERENCES (parent-table [, col ...]) [USING [ASC | DESC] INDEX index-name] /* v.1.5 and above */ [ON DELETE {NO ACTION | CASCADE | SET NULL | SET DEFAULT}] [ON UPDATE {NO ACTION | CASCADE | SET NULL | SET DEFAULT}]

Defining our foreign key:

ALTER TABLE CHILD ADD CONSTRAINT FK_CHILD_PARENT FOREIGN KEY(PARENT_ID) REFERENCES PARENT(ID); /* REFERENCES PARENT is also valid, because ID is the primary key of PARENT */

The following example shows how to create and write to a memory block. The block is deleted and closed at the end of the script, so in order to demonstrate how it works, the script will wait 60 seconds before it terminates. This should be enough time to run the next example and see the shared memory in action.

See recipes 8-2 (Implementing a Server Application), 8-3 (Installing a Serviced Component), and 8-8 (Using Role-Based Security).

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