Decompiling CODASYL DML into retional queries
A “decompilation” algorithm is developed to transform a program written with the procedural operations of CODASYL DML into one which interacts with a relational system via a nonprocedural query specification. An Access Path Model is introduced to interpret the semantic accesses performed by the prog...
| Published in: | ACM Transactions on Database Systems |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Association for Computing Machinery (ACM)
1982
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1145/319682.319688 https://dl.acm.org/doi/pdf/10.1145/319682.319688 |
| Summary: | A “decompilation” algorithm is developed to transform a program written with the procedural operations of CODASYL DML into one which interacts with a relational system via a nonprocedural query specification. An Access Path Model is introduced to interpret the semantic accesses performed by the program. Data flow analysis is used to determine how FIND operations implement semantic accesses. A sequence of these is mapped into a relational query and embedded into the original program. The class of programs for which the algorithm succeeds is characterized. |
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