Data processing: database and file management or data structures – Database design – Data structure types
Patent
1996-12-16
1998-07-28
Black, Thomas G.
Data processing: database and file management or data structures
Database design
Data structure types
707 1, 707 3, 707100, 707103, 370392, 370477, 395555, 395416, 395701, 395705, G06F 1700
Patent
active
057874310
ABSTRACT:
A Java-based rapid application development (RAD) environment for creating applications providing named-based programmatic access to information from columns in databases is described. For increasing the efficiency by which named-based references to database columns are processed by application programs, the system provides methodology for rapid lookups of column names, using a reference cache storing 32-bit references to immutable strings (e.g., Java strings). The reference cache is preferably constructed as a least-recently allocated cache, thereby allowing allocation to occur in a round-robin fashion, with the oldest item allocated being the first item bumped from cache when the cache overflows. Each cache entry stores a reference (e.g., four-byte pointer or handle to a string) and an ordinal entry (i.e. the corresponding database ordinal). As a reference to a particular database column occurs during execution of a program, the reference cache fills with a reference to that column name as well as the corresponding column ordinal. Accordingly, program execution proceeds with comparison of existing items in the cache, using a sequence of rapid, in-line comparisons involving simple data types (e.g., 32-bit references for the column name string). This approach minimizes the need to perform hash lookups or string comparison operations.
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Black Thomas G.
Borland International Inc.
Pardo Thuy
Smart John A.
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