https://github.com/mrwilbroad/introduction-to-java

Introduction to Java programming Language
https://github.com/mrwilbroad/introduction-to-java

Last synced: about 2 months ago
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Introduction to Java programming Language

• Host: GitHub
• URL: https://github.com/mrwilbroad/introduction-to-java
• Owner: mrwilbroad
• Created: 2024-09-06T04:53:16.000Z (4 months ago)
• Default Branch: main
• Last Pushed: 2024-09-09T14:24:43.000Z (3 months ago)
• Last Synced: 2024-09-09T17:23:28.978Z (3 months ago)
• Language: Java
• Size: 44.9 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
- CONNECT JAVA WITH POSTGRESQL DATABASE

1. Retrieve data

2. Save data 

- ALL operation through PreparedStatement

```java

 public List  all()

    {

        String Sql = "SELECT * FROM employee;";

        List staffs = new ArrayList<>();

        try(

                Connection connection = this.connection();

                Statement statement = connection.createStatement();

                ResultSet result = statement.executeQuery(Sql);

                ){

            while (result.next()){

                Staff staff = new Staff();

                staff.id = result.getInt("id");

                staff.first_name = result.getString("first_name");

                staff.last_name = result.getString("last_name");

                staff.email = result.getString("email");

                staff.gender = Gender.valueOf(result.getString("gender"));

                staff.age = result.getInt("age");

                staff.salary = result.getDouble("salary");

                staff.region = result.getString("region");

                staff.department = result.getString("department");

                staffs.add(staff);

            }

        }catch (SQLException e){

            this.Close();

            throw new RuntimeException(e);

        }

        return staffs;

    }

```

- Good way to use Stream to handle data in multiple way 

```java

     public  void showStaffs (){

    Staff staff = new Staff();

    List staffs = staff.all();

//             all staffs

    staffs.forEach(staf -> System.out.printf("%s%n%n",staf.getStaffInfo()));

    List FilteredStaff = staffs.stream()

            .filter(thisStaff -> thisStaff.getAge() < 40)

            .toList();

//             staffs with age below 40

    FilteredStaff.forEach(staf -> System.out.printf("%s%n%n",staf.getStaffInfo()));

}

```