Designing Component-Based Applications by Mary Kirtland
By Mary Kirtland
This e-book is meant that will help you reach construction your first allotted three-tier program in response to COM and MTS. It doesn't try to deal with each factor you'll stumble upon while writing enterprise-wide purposes. It doesn't try to outline a technique that would paintings for each improvement crew. It does provide you with functional suggestion that can assist you layout, increase, try, and installation three-tier purposes in accordance with the Microsoft home windows DNA applied sciences. the first concentration is going to be at the heart tier, or enterprise good judgment, the place you are going to use COM and MTS.
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Additional info for Designing Component-Based Applications
This process is known as Just-In-Time (JIT) activation. MTS as a COM Surrogate As mentioned, all components using MTS services must be in-process components so that all objects can be created within MTS-managed server processes. A server process uses the MTS Executive to provide the run-time support required by component-based, scalable application servers. As a surrogate, MTS provides context management and JIT activation, as described earlier. It manages threads for the process and correctly synchronizes access to objects, so developers do not need to write multi-threaded components.
A classic example here is updating a bank account. Let's say that you have $500 in your checking account and that you use an ATM to make a transfer of $1,000 from a credit card to your account. At the same time, the bank is processing checks drawn on your account for $200. When you finish the credit card transfer and the bank finishes processing the checks, both you and the bank want the balance in your checking account to be $1,300. Not $300 because the record of your $1,000 deposit was lost. Nor $1,500 because the record of the checks was lost.
NOTE Microsoft has introduced several object models for data access over the years. DAO consists of Automation objects for accessing the Microsoft Jet database engine used by Microsoft Access as well as ISAM and ODBC databases. RDO consists of Automation objects for accessing relational ODBC data sources. 0. However, while these technologies will continue to be supported, ADO is where future development efforts will be focused. The Connection object represents a unique session to a data store. Connection is essentially a combination of the Data Source and Session objects in OLE DB.