Java Remove repeated try, catch, finally boilerplate from DAO

Question

I have a DAO class with many methods that have a lot of repeated code along the lines of: -

public void method1(...) {
  Connection conn = null;
  try {
             


        

Answer 1

This is similiar to Vladimirs solution without anonymous classes with possibility to return value from such methods.

interface DaoOperation {
    void execute() throws SQLException;
}

class Operation1 implements DaoOperation {

    public void execute() {
        // former method1
    }
}

// in case you'd ever like to return value
interface TypedDaoOperation {
    T execute() throws SQLException;
}

class Operation2 implements TypedDaoOperation {
    public String execute() {
        return "something";
    }
}

class DaoOperationExecutor {
    public void execute(DaoOperation o) {
        try {
            o.execute();
        } catch (SQLException e) {
            // handle it as you want
        }
    }

    public T execute(TypedDaoOperation o) {
        try {
            return o.execute();
        } catch (SQLException e) {
            // handle it as you want
        }
    }
}