gs1-128 excel macro Logical Hierarchy for the External Schema in Software

Creating Quick Response Code in Software Logical Hierarchy for the External Schema

Logical Hierarchy for the External Schema
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DBD NAME=explosion,ACCESS=LOGICAL DATASET LOGICAL SEGM NAME=section,SOURCE=((auto section,,assemblies 1)) SEGM NAME=all about parts,PARENT=section, SOURCE=((parts skill required,,assemblies 1),(parts,,inventory)) DBDGEN FINISH The segment all about parts consists of the catenation of two source segments, so that this associative relation is formed without actual duplication of entries from the parts owner This is possible because of the existence of logical sibling pointers in the parts skill required segments
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Database Implementation
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A lexicon can also be composed of two logical sibling segments, so that access to the relation can use either of the two attributes, but the access is not symmetric in performance Access procedures, however, using either one of the two attributes, given that the lexicon is properly speci ed in two external schemas, can use the same operation formats 9-6-2 Operations on the Logical Hierarchy procedures are initiated by executing CALL statements The argument of a CALL is a parameter area containing the speci cations to be communicated to IMS Three operands are speci ed with each operation:
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1 The type of operation to be performed 2 The object of the manipulation 3 The user s data area for the retrieval results or update values
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Operations Table 9-8
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The permissible operations are given in Table 9-8
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Data Manipulation operations
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Get Unique for a fetch according to a key adequate to identify segments up to the desired level in the hierarchy Get Next InSeRT DeLETe REPLace for a sequential read to a successor segment or segment sequence for a read within a nest to add a segment to delete a segment to replace a segment Get Next with same Parent
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Locking options for these statements are discussed in Sec 13-1-1 The objects to be manipulated are described by reference to another DL/1 construct, the program communication block or PCB This table, generated also through an assembly process, speci es the segments from the program point of view, references the logical hierarchical structure given in the external schema, and controls the access privileges A PCB which uses the external schema Training (see Fig 9-19) could read as shown in Example 9-26 The parameter PROCOPT speci es that segments may be retrieved (G), inserted (I), replaced (R), or deleted (D)
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Objects Example 9-26
DL/1
Schema Selection
PCB SENSEG SENSEG
TYPE=DB,DBDNAME=Training,KEYLEN=34 NAME=section,PROCOPT=G NAME=job descr,PROCOPT=GR
It is also possible for the program s PCB to refer to the internal schema directly if no (or no appropriate), external schema was de ned Since not all segments of the external schema have to be included in a PCB, the PCB provides a further
Sec 9-6
Interlinked Hierarchies
subsetting capability for the database: in Fig 9-19 skill data are omitted from the Parts explosion A program may use multiple PCBs if it wishes to use more than one external schema simultaneously This allows the use of multiple records, since each external schema de nes one record, constructed of current segments in a hierarchy A currency indicator is associated with every PCB in use The individual data elds are not subject to DL/1 control; the units retrieved, inserted, deleted, or replaced are single segments or a string of multiple segments, each segment at a di erent hierarchical level We will call the segment at the highest level the root segment In order to reference a lower-level segment in a hierarchical structure, a sequence of keys is required A key for a segment to be fetched is the catenation of the keys of all ancestor segments beginning with the root segment and ending with the key of the goal segment The maximum total key length is given as KEYLEN in the PCB To get data regarding the supervised employee Mike, the fully quali ed search key would be (dep="Assembly")(employee="Hare")(supervision="Mike") These keys are presented to DL/1 in a compact form When the computation retrieves a successor segment using the GET-NEXT operation, DL/1 provides the key The data input or output area for the program is a conventional PL/1, COBOL, or assembly language data structure, and the names given to the elds by the programmer are the actual data element names used in computational manipulations The type, unit, length, etc of the elements remain fully under control of the program which has access to the segments containing the data Segments not included in the PCBs, however, do not appear to exist at all The programmer has hence to construct data areas where the size of the segments is determined by the internal schema, but which segments will appear in the data area is determined by the external schema and by the entries in the PCB The order of the segments is determined by the external schema The programmer ignores the linkages; these will not appear in the program data area The size and content of key elds must be calculated in a similar manner from the eld speci cations If alternate segments are possible, such as childreneducation or supervision, the record and key elds have to be dimensioned according to the maximum length, and overlapping data structures will be used using the REDEFINES clause in COBOL and BASED variables in PL/1
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