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Microsoft originally developed the Open Database Connectivity (ODBC) API to provide a database-brand-independent API for database access on its Windows operating systems. The early ODBC API became the foundation for the SQL/CLI standard, which is now the official ANSI/ISO standard for a SQL call-level interface. The original ODBC API was extended and modified during the standardization process to create the SQL/CLI specification. With the introduction of ODBC release 3.0, Microsoft brought ODBC into conformance with the SQL/CLI standard. With this revision, ODBC becomes a superset of the SQL/CLI specification. ODBC goes beyond the SQL/CLI capabilities in several areas, in part because Microsoft s goals for ODBC were broader than simply creating a standardized database access API. Microsoft also wanted to allow a single Windows application program to be able to concurrently access several different databases using the ODBC API. It also wanted to provide a structure where database vendors could support ODBC without giving up their proprietary APIs, and where the software that provided ODBC support for a particular brand of DBMS could be distributed by the database vendor and installed on Windows-based client systems as needed. The layered structure of ODBC and special ODBC management calls provide these capabilities.

The structure of ODBC as it is provided on Windows-based or other operating systems is shown in Figure 19-24 There are three basic layers to the ODBC software: I Callable API At the top layer, ODBC provides a single callable database access API that can be used by all application programs The API is packaged as a dynamic-linked library (DLL), which is an integral part of the various Windows operating systems I ODBC drivers At the bottom layer of the ODBC structure is a collection of ODBC drivers There is a separate driver for each of the DBMS brands The purpose of the driver is to translate the standardized ODBC calls into the appropriate call(s) for the specific DBMS that it supports Each driver can be independently installed on a particular computer system.

This allows the DBMS vendors to provide an ODBC driver for their particular brand of DBMS and distribute the driver independent of the Windows operating system software If the database resides on the same system as the ODBC driver, the driver is usually linked directly to the database s native API code If the database is to be accessed over a network, the driver may call a native DBMS client to handle the client/server connection, or the driver might handle the network connection itself I Driver manager In the middle layer of the ODBC structure is the ODBC driver manager Its role is to load and unload the various ODBC drivers, on request from application programs The driver manager is also responsible for routing the API calls made by application programs to the appropriate driver for execution.

MEDIA_FORMAT) VALUES (3, 2, '02/15/2005', null, 'D');

When an application program wants to access a database via ODBC, it goes through the same initiation sequence specified by the SQL/CLI standard The program allocates an environment handle, then a connection handle, and then calls SQLConnect(), specifying the particular data source to be accessed When it receives the SQLConnect() call, the ODBC driver manager examines the connection information provided and determines the appropriate ODBC driver that is needed The driver manager loads the driver into memory if it s not already being used by another application program Subsequent calls by the application program on this particular CLI/ODBC connection are routed to this driver The application program can, if appropriate, make other SQLConnect() calls for other data sources that will cause the driver manager to concurrently load other drivers for other DBMS brands.

The application program can then use ODBC to communicate with two or more different databases, of different brands, using a uniform API..

19:

Figure 19-24.

INSERT INTO MOVIE_COPY (MOVIE_ID, COPY_NUMBER, DATE_ACQUIRED, DATE_SOLD, MEDIA_FORMAT) VALUES (4, 1, '02/15/2005', null, 'D'); INSERT INTO MOVIE_COPY (MOVIE_ID, COPY_NUMBER, DATE_ACQUIRED, DATE_SOLD, MEDIA_FORMAT) VALUES (5, 1, '02/15/2005', null, 'D'); INSERT INTO MOVIE_COPY (MOVIE_ID, COPY_NUMBER, DATE_ACQUIRED, DATE_SOLD, MEDIA_FORMAT) VALUES (5, 2, '02/15/2005', null, 'V'); INSERT INTO MOVIE_COPY (MOVIE_ID, COPY_NUMBER, DATE_ACQUIRED, DATE_SOLD, MEDIA_FORMAT) VALUES (6, 1, '02/15/2005', null, 'D'); INSERT INTO MOVIE_COPY (MOVIE_ID, COPY_NUMBER, DATE_ACQUIRED, DATE_SOLD, MEDIA_FORMAT) VALUES (7, 1, '02/28/2005', null, 'D'); INSERT INTO MOVIE_COPY (MOVIE_ID, COPY_NUMBER, DATE_ACQUIRED, DATE_SOLD, MEDIA_FORMAT) VALUES (8, 1, '02/28/2005', '03/15/2005', 'D'); INSERT INTO MOVIE_COPY (MOVIE_ID, COPY_NUMBER, DATE_ACQUIRED, DATE_SOLD, MEDIA_FORMAT) VALUES (9, 1, '02/28/2005', null, 'D'); INSERT INTO MOVIE_COPY (MOVIE_ID, COPY_NUMBER, DATE_ACQUIRED, DATE_SOLD, MEDIA_FORMAT) VALUES (10, 1, '03/01/2005', null, 'D'); INSERT INTO MOVIE_COPY (MOVIE_ID, COPY_NUMBER, DATE_ACQUIRED, DATE_SOLD,