Quick study sessions to strengthen memory and retain key concepts.
How can you safely close a ResultSet even if an exception occurs?
Use try-with-resources or a finally block to ensure closure. To ensure a ResultSet is closed even if an…
View Card →What are the trade-offs of manual ORM in JDBC?
Manual ORM is flexible but requires more code and maintenance. Manual ORM provides precise control over how database…
View Card →How do you extract a strongly-typed value from a ResultSet?
Use appropriate get methods like rs.getInt() or rs.getString(). When accessing data in a ResultSet, use methods that match…
View Card →Why is it important to close a ResultSet?
Closing a ResultSet releases database and JDBC resources. Failing to close a ResultSet can lead to resource leaks,…
View Card →Explain manual Object-Relational Mapping for a ResultSet?
Manually map each column of a ResultSet to a field in a Java object. Manual ORM involves extracting…
View Card →How can you iterate through all rows in a ResultSet?
Use a while loop with rs.next() to iterate through each row. To process each row of a ResultSet,…
View Card →Why is joined row mapping harder than mapping one simple table?
Join rows often repeat parent data and must be grouped back into one aggregate. A query that joins…
View Card →How does PreparedStatement help in preventing SQL injection?
PreparedStatement separates SQL logic from data, reducing injection risks. PreparedStatements treat query parameters as data rather than part…
View Card →How would you explain a common pitfall of managing transactions manually in JDBC in an interview?
Forgetting to commit or rollback can lead to data inconsistencies. When managing transactions manually, developers might forget to…
View Card →How does using try-with-resources enhance JDBC operations?
It ensures automatic resource closure, preventing leaks. In JDBC, managing resources like Connection, Statement, and ResultSet is crucial.…
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