312 Frameworks Spring Data Jdbc

Spring Data JDBC with Records

Apply Spring Data JDBC guidelines with Java records.

What is covered in this Skill?

• Records for entity classes (immutable, constructor-friendly)
• @Table for naming when record name differs from the table name
• @Embedded to inline value-object columns into the parent row without a separate table
• Repository pattern
• Immutable updates with static factories for new rows and with* helpers for updates
• save() INSERT vs UPDATE semantics driven by @Id nullability
• Aggregate boundaries: one repository per aggregate root, Set for one-to-many inside the root, foreign keys between aggregates
• Custom queries with @Query and named parameters (no user-input concatenation)
• Transaction management (@Transactional on services; readOnly where appropriate)
• Single query loading (N+1 avoidance)

Scope: Apply recommendations based on the reference rules and good/bad code examples.

Constraints

Before applying any Spring Data JDBC changes, ensure the project compiles. If compilation fails, stop immediately. After applying improvements, run full verification.

• MANDATORY: Run ./mvnw compile or mvn compile before applying any change
• SAFETY: If compilation fails, stop immediately
• VERIFY: Run ./mvnw clean verify or mvn clean verify after applying improvements
• BEFORE APPLYING: Read the reference for detailed rules and good/bad patterns
• EDGE CASE: If request scope is ambiguous, stop and ask a clarifying question before applying changes
• EDGE CASE: If required inputs, files, or tooling are missing, report what is missing and ask whether to proceed with setup guidance

When to use this skill

• Review Java code for Spring Data JDBC
• Apply best practices for Spring Data JDBC in Java code
• Model Spring Data JDBC aggregates with Java records
• Review Spring Data JDBC repositories and aggregate boundaries
• Improve optimistic locking or domain events in Spring Data JDBC

Workflow

• Read reference and assess project context

Read references/312-frameworks-spring-data-jdbc.md and inspect the current project setup before proposing changes.

• Gather scope and decide target improvements

Identify requested outcomes, constraints, and the minimum safe set of changes to apply.

• Apply framework-aligned changes

Implement or refactor configuration/code following the reference patterns and project conventions.

• Run verification and report results

Execute appropriate build/tests and summarize what changed, what was verified, and any follow-up actions.

Reference

For detailed guidance, examples, and constraints, see references/312-frameworks-spring-data-jdbc.md.