feat(jdbc-sqlite): add Database.java for connecting and managing SQLite database

What
- Implemented `Database.java` demonstrating JDBC connectivity with SQLite.
- Loads the `org.sqlite.JDBC` driver and establishes a connection to `univ.db`.
- Showcased table management operations:
  - Creating a table (`CREATE TABLE Temp(a INTEGER, b FLOAT)`).
  - Dropping a table (`DROP TABLE Temp`).
- Ensures proper cleanup by closing `Statement` and `Connection`.
- Added confirmation message for successful connection.

Why
- Demonstrates how to establish JDBC connection with SQLite.
- Provides foundational example for executing SQL statements programmatically.
- Helps developers integrate SQLite into Java applications with minimal setup.
- Serves as a template for database management operations (DDL/DML).

How
- Driver loading: `Class.forName("org.sqlite.JDBC")`.
- Connection established via:
  `DriverManager.getConnection("jdbc:sqlite:/path/to/univ.db")`.
- SQL execution using `Statement stm = con.createStatement()`.
- Supports switching between `CREATE` and `DROP` by uncommenting respective queries.
- Final step: gracefully closing resources.

Key Notes
- SQLite automatically creates the database file (`univ.db`) if it doesn’t exist.
- JDBC abstracts away low-level handling → safe, simple, reusable.
- Always close `Statement` and `Connection` to prevent resource leaks.
- SQL queries can be expanded to include `INSERT`, `UPDATE`, `DELETE`.

Real-life Applications
- Setting up local relational databases for desktop apps.
- Managing schema creation and migration via Java.
- Educational projects requiring quick DB integration.
- Prototyping database-backed applications without full-fledged DBMS.

Future Improvements
- Replace `Statement` with `PreparedStatement` to prevent SQL injection.
- Implement try-with-resources for automatic cleanup.
- Add CRUD operation examples for better completeness.
- Extend with logging and error handling best practices.

Signed-off-by: https://github.com/Someshdiwan <[email protected]>

Author: Someshdiwan

Section28JDBCusingSQLite/DDLUsingJDBC/src/Database.java

@@ -3,18 +3,23 @@
 import java.sql.Statement;
 
 public class Database {
-    public static void main(String[] args)throws Exception {
+    public static void main(String[] args) throws Exception {
+        // Load SQLite JDBC driver
         Class.forName("org.sqlite.JDBC");
 
-        Connection con = DriverManager.getConnection("jdbc:sqlite:C:/sqlite/univ.db");
+        String url = "jdbc:sqlite:/Users/somesh/Java SE/JavaEvolution-Learning-Growing-Mastering/Section28JDBCusingSQLite/univ.db";
+        Connection con = DriverManager.getConnection(url);
 
         Statement stm = con.createStatement();
 
-        //stm.executeUpdate("create table Temp(a integer, b float)");
+        // Uncomment if you want to create a table.
+        // stm.executeUpdate("CREATE TABLE Temp(a INTEGER, b FLOAT)");
 
-        //stm.executeUpdate("drop table Temp");
+        // Uncomment if you want to drop a table.
+        // stm.executeUpdate("DROP TABLE Temp");
 
         stm.close();
         con.close();
+        System.out.println("Database connected successfully!");
     }
-}
+}