Advanced module
Module 16: Database Integration and Persistence
Connect Java applications to relational databases with clear resource handling, transaction boundaries, pooled connections, ORM mapping, and one persistence-focused mini-project.
Module lessons
Module 16: Database Integration and Persistence
JDBC Fundamentals
Learn the direct JDBC workflow clearly enough that higher-level frameworks stop feeling magical. You will open connections, bind parameters safely, map rows into domain objects, and understand where low-level database code still matters even in modern stacks.
Connection Pooling
See connection pools as a throughput and stability tool, not just a performance trick. This lesson explains what the pool manages, why leaks and long transactions starve the system, and which configuration questions actually matter in production.
Transactions and Isolation Levels
Treat transactions as business-protection boundaries, not database ceremony. You will group related statements into one reliable unit, understand rollback behavior, and learn the practical meaning of isolation levels without getting lost in vendor-specific detail.
JPA and Entity Mapping Basics
Use JPA as an object-relational mapping tool without forgetting what the database is doing underneath. This lesson introduces entities, identifiers, the persistence context, and the entity lifecycle so later Spring Data or Hibernate behavior feels predictable instead of magical.
Entity Relationships, Fetch Plans, and N+1 Queries
Map entity relationships carefully so your object graph and query behavior remain understandable. You will cover one-to-many and many-to-one mappings, owning sides, fetch strategies, and the common N+1 query problem that appears when relationships are used carelessly.
Mini-Project: Persistence-Backed CRUD Service
Build a CRUD service that turns persistence concepts into a small but realistic application. The goal is to combine validation, repository boundaries, transactions, and response shaping so the service remains maintainable when requirements grow.
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