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The statement types to be available for manipulation of a 1978 CODASYL database are given in Table 9-4 Speci c formats for the COBOL language are given in the documentation for COBOL of the CODASYL committee, and FORTRAN versions have also been speci ed Each executable statement has a numeric code The number is used when the manipulation functions of a DBMS are invoked by one of the di erent host languages
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/* Obtain access to the relevant portions of a schema, its storage schema, and the contents of the database de ned by it by invoking a subschema, using COBOL * DB sub schema name WITHIN schema name [; ACCESS CONTROL KEY = xxxx] LD keep list name LIMIT IS integer /* to keep currency indicators */ /* Transaction control */ 13 READY lock areas as speci ed in the AREA clause of the schema 01 COMMIT release record locks and reset all currency indicators and keep lists The statements coded 02, 03, 04, 11, 12, 15, and 16 lock the records and link-set entries accessed 06 FINISH release locked areas 09 IF test database status and error condition codes 14 ROLLBACK remove all database changes since READY or COMMIT /* Finding and manipulating records */ 05 FIND locate a record 08 GET obtain speci ed data items or all of the current record 15 STORE insert a record according to the schema speci cations 11 MODIFY update the current record 04 ERASE delete the current record obtain a currency indicator and place it into a keep list 10 KEEP db cp /* Manipulation of link-sets */ 02 CONNECT establish MANUAL link-set membership 03 DISCONNECT remove a record from link-set membership 16 RECONNECT move a record from one link-set to another link-set /* Other */ 07 FREE db cp 12 ORDER USE release currency indicator, including any entries kept for currency indicator db cp in a keep list sort the members of the current set logically so that they can be retrieved in a certain order declaration to identify procedure to be executed when an exception or error condition occurs and to identify access control procedures
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The standard COBOL statements that permit conditional expressions (IF, EVALUATE, PERFORM, SEARCH) can also refer to database conditions The three condition codes which permit testing the database are named:
TENANCY link-set MEMBERS Is the current record an owner or a member, or either (a tenant) of a speci ed Is the speci ed link-set empty, ie, are there any member records
DB-KEY Is the currency indicator of a found record the same as a previously obtained currency indicator, or does it match one kept within a given keep list
end ninepoint There are ve prede ned registers to provide information when an error occurs: DB-STATUS gives a numeric code de ning the error, as shown in Example 9-19; while DB-SET-NAME, DB-RECORD-NAME, DB-ACCESS-CONTROL-KEY, and DB-DATA-NAME contain character strings de ning the current position in the database 9-5-3 Finding Records The FIND command is the principal means of navigation through the network A FIND command does not cause the actual record to be put into the user s program area but does change relevant currency pointers After a FIND command locates a record which contains desired data, some or all of its data elds may be retrieved by the execution of a GET command The GET command speci es which data elds are required or if the entire record is to desired The data is copied from the record indicated by the currency pointer into the program area associated with the GET data To obtain another record a new FIND statement has to be executed
Example 9-19
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