9.7 Handcrafted SQL
Essentially every application today must work with a relational database. Many applications rely on object/relational mapping to bridge the gap. Whether youâre using Ruby on Railsâ ActiveRecord, Hibernate, or any of the three EJB persistence models, some form of object/relational mapping is in play. ORM packages generate very predictable, repetitive SQL. Predictable access patterns of SQL are good for capacity, because a competent DBA can tune the database to make those queries perform well.[71]
Each of these ORM layers allows the developer to get down to direct SQL access in one way or another. Hibernate, for example, ...
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