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By storing structural information in system tables, the DBMS can use its own access methods and logic to rapidly and efficiently retrieve the information it needs to perform these tasks. If the system tables were used only internally to the DBMS, they would be of little interest to database users. However, the DBMS generally makes the system tables available for user access as well. If the system tables themselves are not made available, the DBMS generally provides views based on the system tables that offer a set of user-retrievable catalog information. User queries against the system catalogs or views are almost always permitted by personal computer and workgroup class databases. These queries are also supported by mainframe and enterprise DBMS products, but the database administrator may restrict system catalog access to provide an additional measure of database security. By querying the system catalogs, you can discover information about the structure of a database, even if you have never used it before. User access to the system catalog is read-only. The DBMS prevents users from directly updating or modifying the system tables because such modifications would destroy the integrity of the database. Instead, the DBMS itself takes care of inserting, deleting, and updating rows of the system tables as it modifies the structure of a database. Data Definition Language (DDL) statements such as CREATE, ALTER, and DROP, and security management statements such as GRANT and REVOKE, produce changes in the system tables as a result of their actions. In some DBMS products, even DML statements that modify the database, such as INSERT and DELETE, may produce changes in the system tables, which might, for example, keep track of how many rows are in each table.

In general, programmers using older languages, such as COBOL and Assembler, will tend to favor the embedded SQL approach Programmers using newer languages, such as C++ and Java, will tend to favor the callable API approach The following table summarizes the programmatic interfaces offered by some of the leading SQL-based DBMS products:.

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One of the most important benefits of the system catalog is that it makes possible userfriendly query tools, such as the Query Builder tool that is part of Oracle Application Express that comes with Oracle Express Edition, as shown in Figure 16-1. The objective of such tools is to let users simply and transparently access the database without learning the SQL language. Typically, a tool leads the user through a series of steps such as: 1. The user gives a name and password for database access. 2. The query tool displays a list of available tables. 3. The user chooses a table, causing the query tool to display a list of the columns it contains. 4. The user chooses columns of interest, perhaps by clicking their names as they appear on a PC screen. 5. The user chooses columns from other tables or restricts the data to be retrieved with a search condition. 6. The query tool retrieves the requested data and displays it on the user s screen. A general-purpose query tool like the one in Figure 16-1 will be used by many different people, and it will be used to access many different databases. The tool cannot possibly know in advance the structure of the database that it will access during any given session. Thus, it must be able to dynamically learn about the tables and columns of a database. The tool uses system catalog queries for this purpose.

C-api (proprietary), ODBC, JDBC, Perl, PHP, Tcl Oracle Call Interface (OCI), ODBC, JDBC DB Library (dblib), ODBC, JDBC

16:

The basic techniques of embedded SQL, called static SQL, are described in this chapter. Some advanced features of embedded SQL, called dynamic SQL, are discussed in 20. Callable SQL APIs, including the Sybase/SQL Server API, ODBC, and JDBC, are discussed in 21.

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