en/tutorials/java_database_connectivity

Java Database Connectivity (JDBC) Tutorial

🔧 JDBC is a Java API that enables Java applications to interact with relational databases. It provides a standard interface for executing SQL statements and managing database connections.

Key Concepts

• JDBC Driver: A bridge between Java and the database (e.g., MySQL, PostgreSQL).
• Connection Pool: Reuses database connections to improve performance.
• SQL Execution: Use Statement, PreparedStatement, or CallableStatement to run queries.

Steps to Connect to a Database

1. Load Driver

   Class.forName("com.mysql.cj.jdbc.Driver");
   

2. Establish Connection

   Connection conn = DriverManager.getConnection(url, user, password);
   

3. Create Statement

   Statement stmt = conn.createStatement();
   

4. Execute Query

   ResultSet rs = stmt.executeQuery("SELECT * FROM users");
   

5. Process Results
   Use while (rs.next()) to iterate through the result set.
6. Close Resources
   Always close ResultSet, Statement, and Connection in reverse order.

Example Code

📚 Click here for a full JDBC example

Best Practices

• Use PreparedStatement to prevent SQL injection.
• Close connections to avoid resource leaks.
• Handle exceptions properly with try-catch blocks.

📌 Explore more about JDBC architecture for advanced topics!