How do you use isolation levels with a simple code example?

Isolation levels in database management systems determine how transaction integrity is visible to other users and vice versa. The four standard isolation levels are Serializable, Repeatable Read, Read Committed, and Read Uncommitted. Each level balances between data consistency and system performance, making it crucial to choose the right one based on application requirements.

Here is a simple example of how to use isolation levels in a Java application using JDBC:


        import java.sql.Connection;
        import java.sql.DriverManager;
        import java.sql.SQLException;
        
        public class IsolationLevelExample {
            public static void main(String[] args) {
                Connection connection = null;
                try {
                    // Establish the connection
                    connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "username", "password");
                    
                    // Set isolation level to Read Committed
                    connection.setTransactionIsolation(Connection.TRANSACTION_READ_COMMITTED);
                    
                    // Begin transaction
                    connection.setAutoCommit(false);
                    
                    // Your code for database operations goes here
                    
                    // Commit transaction
                    connection.commit();
                } catch (SQLException e) {
                    if (connection != null) {
                        try {
                            connection.rollback();
                        } catch (SQLException ex) {
                            ex.printStackTrace();
                        }
                    }
                    e.printStackTrace();
                } finally {
                    if (connection != null) {
                        try {
                            connection.close();
                        } catch (SQLException e) {
                            e.printStackTrace();
                        }
                    }
                }
            }
        }

How do you use isolation levels with a simple code example?

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How do you use isolation levels with a simple code example?

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