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Yet another aspect of a subschema is considered by CODASYL and SQL The intention is that the schema and the schema description language can be utilized by programs written in a number of di erent computer languages Variations of the subschema language are designed to t the syntax, semantics, and power of the host language Languages to be supported include COBOL, FORTRAN, and PL/1 Languages with exible data structures, like LISP, are not easily supported by traditional schemas and have either used intermediate modules as interfaces, or treated databases as large virtual memory segments Even in procedural languages there are problems to be resolved due to representation and structure di erences An instance is the COBOL language capability to have a structure containing element types which OCCUR a variable number of times, as shown in Fig 8-9, a notion not included in FORTRAN In PL/1 a feature a ecting schema power is the capability to handle variable-length character strings The problem is aggravated in a distributed system with heterogeneous processors, where, for instance, real values may have di erent representations In a mixed language or computer environments users will have to agree to avoid incompatible data types 8-5-4 Data Ownership The database administrator has the responsibility for the successful operation of the database system While the structural integrity and the adequacy of the interfaces between external, conceptual, and internal schemas require a central view, it may be necessary to delegate data content responsibility to those most closely associated with a particular database submodel Other aspects of this function are discussed in Sec 8-6-2 The use of multiple external database schemas is related to the assignment of responsibilty for the maintenance of the stored data Certain data elements may be collected and controlled for quality by one group This group then may use an external schema to manage its data and assign permission for its use A new concept pertaining to data emerges here, namely, data ownership This is another candidate for an attribute to be speci ed in the schema language, or it may be a part of the access privilege speci cation When attributes or relations are to be added, the maintenance responsibility over these data should be established Private and public data may be distinguished, as well as source and derived data elements Feedback may be necessary to inform owners of the outside uses of the data, since not all functions of data elements and data relationships can be perceived from one external schema The DBTG AREA speci cation allows the partitioning of the database into a number of areas Areas can be individually protected In several implementations this also means that the data can reside on physically distinct devices Ownership and data responsibility also extends to derived data When on-entry and on-access database procedures are used, control can be well de ned, but most derived data is placed into databases by explicit programming.

In addition to the numeric types, the C# language offers two other types: char and bool. The char type is used from time to time when you need to hold a single character. The char type can represent a simple character (A), a Unicode character (\u0041), or an escape sequence ('\n'). We won t discuss Unicode characters in this book, and you ll see escape sequences later, where we ll explain them in context. When you refer to a char in your code, you need to surround it with single quotes, like this: 'A'.

8

Sec 8-6

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The one remaining important type is bool, which holds a Boolean value. A Boolean value is one that is either true or false. Boolean values are used frequently in C# programming, as you ll see throughout this book. Virtually every comparison (is myDog bigger than yourDog ) results in a Boolean value.

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These derived data, when stored within the database, become indistinguishable from data which entered the database from the outside The responsibility for the validity of results derived by processing source input is assigned to the group which controls the processing programs Errors in the source data may be the responsibility of another group The chain of derived results can go through various levels and may have involved recursion, making checking and restoration di cult

The bool type was named after George Boole (1815 1864), an English mathematician who published An Investigation into the Laws of Thought, on Which Are Founded the Mathematical Theories of Logic and Probabilities, and thus created the science of Boolean algebra.

Protection by Database Procedures There may, for instance, be an AREA for medical data of employees which can only be updated and written by authorized sta , de ned by a keyword variable check MDnumber To disable access by nonauthorized sta to certain disease data, the database administrator can also specify a database procedure hush which disables retrieval of data based on values in the access path as shown in Example 8-12 Monitoring of access to data also may be necessary for con dential data items The hush routine could achieve this by also reporting every approved use to a logging device Example 8-12

The compiler will help you by complaining if you try to use a type improperly. The compiler complains in one of two ways: it issues a warning or it issues an error.

AREA NAME IS medical RECORD NAME IS diseases WITHIN medical ON GET CALL hush USING diseases; PRIVACY LOCK FOR STORE IS check MD number 1 patient name PICTURE 20(X); OCCURS 1 TIMES; CHECK IS NULL PICTURE 9(9); OCCURS 1 TIMES; CHECK IS NULL 1 social sec 1 sick call no PICTURE 99 OCCURS sick call no TIMES 1 sick call 2 disease PICTURE 50(X) PICTURE 9999V9 2 ICDA code 2 days PICTURE 999 Once a database is operational any changes to the schema can cause many programs to fail The use of a database may not have been controlled so that all users who are potentially a ected by a contemplated change can be identi ed and warned A check program attached to the record type to be changed or to an entire AREA can be used to report on usage which may con ict with contemplated changes 8-6 STRUCTURE, SCHEMA, AND USAGE

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