* Made minor changes in some patterns such as removed throws clause where not needed, changed incorrect order of arguments in assertEquals * Minor refactorings and code style changes. 1) Removed several use of raw types 2) Removed unnecessary throws clauses 3) Used lambda expressions wherever applicable 4) Used apt assertion methods for readability 5) Use of try with resources wherever applicable 6) Corrected incorrect order of assertXXX arguments * Removed unused import from Promise * Addressed review comments * Addressed checkstyle issue
layout, title, folder, permalink, categories, tags
layout | title | folder | permalink | categories | tags | ||
---|---|---|---|---|---|---|---|
pattern | Data Access Object | dao | /patterns/dao/ | Persistence Tier |
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Intent
Object provides an abstract interface to some type of database or other persistence mechanism.
Applicability
Use the Data Access Object in any of the following situations
- when you want to consolidate how the data layer is accessed
- when you want to avoid writing multiple data retrieval/persistence layers