Persistent programming language
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Programming languages that natively and seamlessly allow objects to continue existing after the program has been closed down are called persistent programming languages. JADE is one such language.
A persistent programming language is a programming language extended with constructs to handle persistent data. It is distinguished from embedded SQL in at least two ways:
In a persistent programming language:
- The query language is fully integrated with the host language and both share the same type system.
- Any format changes required between the host language and the database are carried out transparently.
In Embedded SQL:
- Where the host language and data manipulation language have different type systems, code conversion operates outside of the OO type system, and hence has a higher chance of having undetected errors.
- Format conversion must be handled explicitly and takes a substantial amount of code.
Using Embedded SQL, a programmer is responsible for writing explicit code to fetch data into memory or store data back to the database. In a persistent programming language, a programmer can manipulate persistent data without having to write such code explicitly.
The drawbacks of persistent programming languages include:
- While they are powerful, it is easy to make programming errors that damage the database.
- It is harder to do automatic high-level optimization.
- They do not support declarative querying well.
Examples
See also
- Object-relational mapping
- Object-oriented database management systems
- Object prevalence
- Phantom OS - persistent OS project
References
- ^ Greenes, Robert; Pappalardo, A Neil; Marble, Curt W; Barnett, G Octo (1969). "Design and implementation of a clinical data management system". Comput Biomed Res. 5 (Oct): 469–85. doi:10.1016/0010-4809(69)90012-3. PMID 11697375.
- ^ "Jade Software delivers Jade 7.1". ZDnet. Retrieved 21 December 2019.
- ^ "Quit Command | ObjectScript Tutorial | Caché & Ensemble 2018.1.4 & 2018.1.5".
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