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Overview of JDBC Application Development

Sep 3, 2024

JDBC Application Development

Introduction to JDBC

  • JDBC (Java Database Connectivity) is part of JSC module.
  • Provides rules and guidelines to develop JDBC driver software.
  • JDBC driver acts as a bridge between Java applications and database software.

Persistence Logic

  • Persistence logic refers to the logic that interacts with a database to manipulate data.
  • CRUD operations are performed:
    • Create - Insert records
    • Read - Select records
    • Update - Modify records
    • Delete - Remove records
  • In Indian culture, CRUD is referred to as "CURD" or "Crude" due to local terminology.

Importance of CRUD Operations

  • Essential in service sectors like banking and hospitals.
  • Example:
    • Inserting a new patient's record.
    • Updating phone number when a patient changes contact.
    • Selecting patient details before treatment.
    • Deleting records post-treatment.

Non-Technical Users and JDBC

  • Non-technical users cannot write SQL queries directly.
  • JDBC is used to develop user-friendly front-end applications (with buttons, text boxes) to perform database operations without needing SQL knowledge.

JDBC Steps in Application Development

  1. Load JDBC Driver Class

    • Register the driver with the DriverManager service.
    • Only the driver class that implements java.sql.Driver is necessary.
  2. Establish Connection

    • After registering the driver, establish a connection between the Java application and the database.
    • This connection acts as a communication channel (road).
  3. Create Statement Object

    • A statement object is necessary to send SQL queries to the database and receive results back.
    • It serves as a vehicle for carrying inputs and outputs between the application and database.
  4. Send and Execute SQL Query

    • Use the statement object to send SQL queries (e.g., INSERT, SELECT) to the database.
  5. Gather Results and Process

    • After executing a query, gather the results using a ResultSet object.
    • Process the results based on the query executed.
  6. Close JDBC Objects

    • It's crucial to close all JDBC objects to free up resources.
    • Open JDBC objects (like connections) should always be closed to avoid resource leaks.

Conclusion & Key Practices

  • The importance of closing connections is highlighted through a metaphorical story about a king and his citizens.
  • Summary of steps:
    1. Load and register JDBC driver
    2. Establish connection
    3. Create statement object
    4. Send and execute SQL query
    5. Gather and process results
    6. Close all JDBC objects

DriverManager Service

  • An invisible built-in service in Java applications that manages JDBC drivers.
  • Essential for registering drivers and enabling their use in applications.