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JDBC - MetadataJDBC - TransactionsJDBC - ACID PropertiesJDBC - Batch ProcessingJDBC - Stored Procedures

JDBC - The ACID Properties

📌 What You Will Learn
  • What a transaction is and the 'all or none' rule
  • The ACID properties of a transaction
  • Local vs Global transactions
  • The three JDBC steps: setAutoCommit(false), commit, rollback
  • Savepoints for partial rollback

The ACID Properties is a fundamental part of database programming with JDBC. This lesson explains The ACID Properties with complete, runnable code examples, clear step-by-step explanations, and common mistakes to avoid with exam-style MCQs at the end.

The ACID Properties

Every proper transaction follows four properties, remembered by the word ACID:

PropertyMeaning
A — AtomicityEither all operations happen, or none.
C — ConsistencyThe database is always in a valid state (reliable data).
I — IsolationOne transaction is separated from other transactions running at the same time.
D — DurabilityOnce committed, the changes are permanent — even after a system restart or crash.
In simple words: ACID is a four-letter checklist every good transaction must pass. Atomicity keeps it all-or-none, Consistency keeps the data valid, Isolation keeps transactions apart, and Durability makes committed changes permanent — even after a crash.
📝 Key Takeaways
  • Transaction = related operations as one unit, rule: all or none.
  • ACID: Atomicity, Consistency, Isolation, Durability.
  • JDBC supports local transactions only; global ones need EJB/Spring.
  • Three steps: setAutoCommit(false) -> operations -> commit() or rollback().
  • Savepoints allow partial rollback to a marker.
  • Without transactions, a failed step leaves the database inconsistent.

🧠 Test Your Knowledge

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