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JDBC - Quick Revision Checklist

📌 What You Will Learn
  • The most important JDBC questions asked in exams and interviews
  • Clear, short answers with memory tricks
  • The differences tables you must remember
  • A final revision checklist

Quick Revision Checklist is a fundamental part of database programming with JDBC. This lesson explains uick Revision Checklist — 20 Points with complete, runnable code examples, clear step-by-step explanations, and common mistakes to avoid with exam-style MCQs at the end.

Quick Revision Checklist — 20 Points

  • JDBC = Java + Database bridge; part of Java SE.
  • Driver = translator; Connection = road; Statement = vehicle; ResultSet = box.
  • 4 driver types; Type-4 thin driver is recommended; Type-1 removed.
  • 6 steps: load driver, connect, statement, execute, process, close.
  • URL = jdbc : subprotocol : subname.
  • executeQuery → ResultSet (SELECT); executeUpdate → int (INSERT/UPDATE/DELETE).
  • rs.next() moves the cursor; getInt/getString read values.
  • PreparedStatement = ? placeholders + setXxx; stops SQL injection.
  • CallableStatement = {call proc(?,?)} for stored procedures.
  • Batch updates = addBatch + executeBatch (fewer round-trips).
  • Dates: java.sql.Date / Time / Timestamp (not java.util.Date).
  • BLOB = binary (images); CLOB = large text.
  • Pooling reuses connections; DataSource is modern.
  • Properties file keeps DB settings outside code.
  • Transactions: setAutoCommit(false) → commit / rollback; ACID.
  • Metadata: DatabaseMetaData, ResultSetMetaData, ParameterMetaData.
  • ResultSet types: forward-only (default), scrollable, updatable.
  • RowSet = flexible, scrollable, often disconnected ResultSet.
  • Cursors: implicit (auto) and explicit (SYS_REFCURSOR).
  • Always close resources; use try-with-resources.
📝 Key Takeaways
  • JDBC connects Java to any database; it is database independent and platform independent.
  • Type-4 thin driver is the modern choice; the ODBC bridge is dead.
  • PreparedStatement is the professional default — safe and fast.
  • Transactions, pooling, metadata, ResultSet types and RowSets round out the full picture.
  • Revise the comparison tables (Statement family, execute family, driver types) before any interview.

🧠 Test Your Knowledge

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