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7.20 DEF_ARRAY
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The DEF_ARRAY command is used to define an array structure within an RDML function.
The array created by this command can be used for:
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- Grouping up to
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- 100 individual identical fields into contiguous storage, thus allowing "indexed" references to be made to any one of the fields. To do this, use the OF_FIELDS parameter. This is the only option supported for RDMLX fields. Note that if an object is not enabled for RDMLX it is limited to 100 fields.
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- Overlaying a large field with an array structure, thus allowing "indexed" references to individual areas within the larger field. To do this, use the OVERLAYING parameter. This option is not supported when using an RDMLX field.
This command provides full array support to LANSA applications.
However, it must be emphasized that the use of array constructs in database files is NOT considered to be the best long-term strategy in terms of relational database design.
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Whenever hardware resources permit, a fully relational design will always yield a simpler, easier-to-use, easier-to-maintain, and longer-lasting solution.
Also See
7.20.2 DEF_ARRAY Comments / Warnings
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Required DEF_ARRAY | ||
| No Format | ||
| Required
DEF_ARRAY ---- NAMENAME --------- #name of array#name of array -----------------> >>-- INDEXES ------- #index field name ---------------> | |
50 max --------- >>-- OF_FIELDS ------- #field name ---------------------> | expandable group expression |
100 max --------------
-- OR -- >>-- OVERLAYING --- #field name -- start position ------> ------------------------------------------------------------------ Optional >-- TYPE----- >-- TYPE --------- *CHAR *DEC *PACKED *SIGNED -----> >>-- TOT_ENTRY ---- total entries (1-9999) --------------> >>-- ENTRY_LEN ---- entry length (1-256) ---------------> >>-- ENTRY_DEC --- -number of decimals (0-9) -----------| |