The second strategy takes advantage of the feature stated in the Oracle Expression Lists documentation: "A comma-delimited list of sets of expressions can contain any number of sets." In this case, to avoid executing the N queries proposed by the previous approach, this strategy proposes to build a query composed of lists of expressions interrelated by the OR operator. The first strategy is the simplest: split the collection of IDs into subcollections, considering Oracle's upper limit (L = 1,000) for the comma-delimited list of expressions. Disregarding all the ease provided by Object-Relational Mappers, among which Hibernate can be underlined as a very reliable option, a straightforward way to address such a situation is to build a SQL SELECT query and bind all identifiers as a comma-delimited list of expressions in combination with a SQL IN operator. Even though it performs an additional step of inserting all IDs into the temporary table, this strategy does not need to use the QSplitter tool to generate subcollections and takes advantage of the use of the JOIN clause to avoid indicating hard-coded IDs in the SELECT.
This Cyber News was published on feeds.dzone.com. Publication date: Tue, 01 Oct 2024 18:13:06 +0000