Core Java II: JDBC: Connect, Query, Map Rows to Records | Unit 35
The five types that carry every database call in Java, and the one habit that decides whether your app is on the news. Three sentences this unit exists for: swap the driver and your code does not change, the question mark is parsed before your value exists, and a timestamp column is a wall clock rather than a moment. All three are run, not described — including the injection, against a table this program creates and drops itself.
Core Java II — Under the Hood · Section 8: JDBC + SQL · Unit 35 of 44
In this unit:
• Connection, Statement, PreparedStatement, ResultSet, DataSource (diagram)
• Open a connection twice — and swap the driver without touching your code
• Rows into records, one row at a time
• The injection, run for real: the whole table comes back, then the parameter stops it
• The clock that moved: a timestamp column off by five and a half hours
Code for this unit: https://github.com/viveksingh98/tiffi...
Every unit ships its own folder with the sources and a README of the exact commands, so you can reproduce every terminal capture in this video yourself.
Chapters:
00:00 Intro
00:21 The Four Layers
01:13 Opening A Connection, Twice
01:58 Rows Into Records
02:43 The Injection, Run For Real
03:51 The Clock That Moved + Recap
Up next — Unit 36: Transactions and Batches: All or Nothing.
About this course: Core Java II — Under the Hood is the sequel to Java Fundamentals. Course 1 taught you to write TiffinBox; Course 2 opens the box and shows what the machine does with your code. 44 units across 9 sections — JVM memory and GC, generics, threads and virtual threads, values and contracts, I/O and networking, modules and packaging, SQL and JDBC, reflection and the capstone server. Every claim on screen is a real terminal capture from JDK 25, run several times, and every unit breaks something on purpose so you have seen the failure before it happens to you.
🎙️ Note: This unit is narrated by an AI voice model trained on my own voice.
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Code for this course: https://github.com/viveksingh98/tiffi...
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