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2023/1/7

GhatGPT 試玩

試玩最近很紅的OpenAPI ChatGPT。

試玩了一下覺得很多低階的工作不久後都可被取代了，雖然有小瑕疵，但整體而言比真人做得還好，不過對於開放性和創造力的問題則很弱，且程式碼似乎也是從網路上搜刮訓練出來的，問的問題要足夠精確才能得到較合理的答案，而且依舊需要工程師審核正確性。

不久的將來開始可以用嘴寫程式，什麼語言不再是重點，有價值的是溝通協調與商業邏輯。說不定未來有「ChatGPT應用工程師」的工作。

此外Google搜尋的廣告業務模式將面臨ChatGPT的威脅而地位不保，科技的突破真的是一瞬間會讓一個產業消失。Google是否會像當初的Nokia一樣呢？


提問一

幫我寫一段可以累加到一百的迴圈的Java程式碼

GhatGPT：

可以使用以下 Java 程式碼來寫一個迴圈，累加到 100：

int sum = 0;
for (int i = 1; i <= 100; i++) {
    sum += i;
}
System.out.println(sum);

這段程式碼會從 1 開始逐個加到 100，並將累加的結果印出。如果要從不同的數字開始累加，可以更改 for 迴圈中的初始值。例如，要從 50 開始累加到 100，可以將 for 迴圈中的初始值更改為 50。


提問二

幫我寫一封辭職信給主管

GhatGPT：

親愛的主管：

我在此寫信告訴您，我已決定辭去我在貴公司的職位。我感謝您在過去幾年中給予我的機會和支持，讓我在這裡學習和成長。

雖然我很欣賞貴公司的文化和工作氛圍，但我已經決定接受新的挑戰。我相信這將會是我人生中的一個重要轉折點，並期望在未來能夠繼續與貴公司保持聯繫。

我將盡快安排我的工作交接，並確保在我離開之前把所有事情都完成。如果您或貴公司需要任何幫助，請隨時聯繫我。

再次感謝您的支持和信任。我將永遠感恩貴公司給予我的機會，並祝願貴公司未來蒸蒸日上。

敬祝

[您的名字]


提問三

幫我翻譯「今天天氣很好，我想帶妹妹去看火車」。

GhatGPT：

The weather is great today. I want to take my little sister to see the trains.


提問四

我是一名有5年工作經驗的國貿人員，幫我寫一封英文的求職信

GhatGPT：

Dear Hiring Manager,

I am writing to express my interest in the international trade position at your company. With over 5 years of experience in the field, I am confident in my ability to contribute to the success of your organization.

In my previous role at XYZ Company, I was responsible for managing a portfolio of international clients and negotiating import/export contracts. Through my efforts, I was able to increase company revenue by 20% in my first year and maintain steady growth in the following years. In addition to my technical skills, I am also proficient in Mandarin and have a strong understanding of Chinese business culture, which has proven to be a valuable asset in my previous positions.

I am excited about the opportunity to join a dynamic and reputable company like yours. I believe my skills and experience make me an ideal fit for this role and I am eager to contribute to the continued success of your team. Thank you for considering my application. I look forward to the opportunity to discuss my qualifications further.

Sincerely,

[Your Name]


提問五

幫我寫一份 go語言可以存取PostgreSQL資料庫的Employee資料表，欄位有序列號，姓名，年紀，建立時間。

GhatGPT：

以下是一個使用 Go 語言存取 PostgreSQL 資料庫並操作 Employee 資料表的範例程式：

package main

import (
    "database/sql"
    "fmt"
    "time"

    _ "github.com/lib/pq"
)

const (
    host     = "localhost"
    port     = 5432
    user     = "postgres"
    password = "yourpassword"
    dbname   = "yourdatabase"
)

type Employee struct {
    ID        int
    Name      string
    Age       int
    CreatedAt time.Time
}

func main() {
    psqlInfo := fmt.Sprintf("host=%s port=%d user=%s "+
        "password=%s dbname=%s sslmode=disable",
        host, port, user, password, dbname)

    db, err := sql.Open("postgres", psqlInfo)
    if err != nil {
        panic(err)
    }
    defer db.Close()

    err = db.Ping()
    if err != nil {
        panic(err)
    }

    fmt.Println("Successfully connected to database!")

    // Insert a new employee into the table
    name := "John Doe"
    age := 30
    createdAt := time.Now()
    result, err := db.Exec("INSERT INTO employee(name, age, created_at) VALUES($1, $2, $3)", name, age, createdAt)
    if err != nil {
        panic(err)
    }

    fmt.Println("Successfully inserted a new employee into the table!")

    // Get the ID of the newly inserted employee
    id, err := result.LastInsertId()
    if err != nil {
        panic(err)
    }
    fmt.Println("ID of newly inserted employee:", id)

    // Query the employee table and print the result
    rows, err := db.Query("SELECT * FROM employee")
    if err != nil {
        panic(err)
    }
    defer rows.Close()

    var employees []Employee
    for rows.Next() {
        var e Employee
        err := rows.Scan(&e.ID, &e.Name, &e.Age, &e.CreatedAt)
        if err != nil {
            panic(err)
        }
        employees = append(employees, e)
    }

    fmt.Println("Employees:")
    for _, e := range employees {
        fmt.Printf("%d, %s, %d, %s\n", e.ID, e.Name, e.Age, e.CreatedAt)
    }
}

這段程式會連接到 PostgreSQL 資料庫，並在 Employee 資料表中插入一筆新記錄。然後它會查詢 Employee 資料表，


提問六

幫我寫一段go程式碼可非同步發送字串訊息到另一個api url為/message/id

GhatGPT：

以下是一個使用 Go 語言非同步傳送字串訊息到另一個 API 的範例程式：

package main

import (
    "bytes"
    "encoding/json"
    "fmt"
    "net/http"
    "sync"
)

const url = "http://example.com/message/id"

func sendMessage(id int, message string, wg *sync.WaitGroup) {
    defer wg.Done()
    data, err := json.Marshal(map[string]string{"id": id, "message": message})
    if err != nil {
        fmt.Println(err)
        return
    }
    resp, err := http.Post(url, "application/json", bytes.NewBuffer(data))
    if err != nil {
        fmt.Println(err)
        return
    }
    defer resp.Body.Close()
    fmt.Println("Successfully sent message to", url)
}

func main() {
    var wg sync.WaitGroup
    wg.Add(3)
    go sendMessage(1, "Hello", &wg)


提問七

給兩個陣列[1,2,3,4,5]和[-1,2,4,6,9]請寫一個Go程式碼可找出兩陣列共有的元素，時間複雜度必須小於O(N^2)

GhatGPT：

以下是一個使用 Go 語言找出兩個陣列中共有的元素，且時間複雜度小於 O(N^2) 的範例程式：

package main

import "fmt"

func main() {
    array1 := []int{1, 2, 3, 4, 5}
    array2 := []int{-1, 2, 4, 6, 9}

    // Use a map to store the elements of array2
    elements := make(map[int]bool)
    for _, element := range array2 {
        elements[element] = true
    }

    commonElements := []int{}
    for _, element := range array1 {
        if _, ok := elements[element]; ok {
            commonElements = append(commonElements, element)
        }
    }

    fmt.Println("Common elements:", commonElements)
}

這段程式會使用一個 map 儲存 array2 中的元素，然後遍歷 array1，如果 map 中存在相同的元素，則將該元素加入 commonElements 陣列中。


提問八

幫我寫一個SpringBoot Controller可返回hello [姓名]，[姓名]為從client傳來的path variable

GhatGPT：

以下是一個使用 SpringBoot 實現返回 "hello [姓名]" 的範例控制器類：

package com.example.demo;

import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    @RequestMapping("/hello/{name}")
    public String hello(@PathVariable String name) {
        return "hello " + name;
    }
}

請注意，這個控制器類需要在您的 SpringBoot 項目中正確設置才能正常工作。


提問九

幫我寫一個Java單例類別，可產生一個Instance單例物件，且多執行緒存取時要避免執行序干涉。

GhatGPT：

以下是一個使用 Java 實現單例類別的範例，並使用 synchronized 保證多執行緒存取時能避免執行序干涉：

public class Singleton {
    private static Singleton instance;

    private Singleton() {}

    public static synchronized Singleton getInstance() {
        if (instance == null) {
            instance = new Singleton();
        }
        return instance;
    }
}

這個單例類別只有在第一次呼叫 getInstance() 方法時才會產生新的單例物件，之後呼叫此方法都會返回同一個單例物件。使用 synchronized 修飾詞能夠保證在多執行緒環境下，同一時間只有一個執行緒能夠存取單例物件。


提問十

幫我寫一個測試ProfileService.GetUserByID方法的Go測試程式，當輸入ID=1時，應返回User.Name為'John'；當輸入ID=2時，應返回User.Name為'Mary'。ProfileService.GetUserByID方法依賴UserRepo.GetUserByID來從PostgreSQL取得User資料表的資料。User資料表有欄位[id]、[name]、[age]、[created_at]。

GhatGPT：

以下是一個使用 Go 語言測試 ProfileService.GetUserByID 方法的範例測試程式：

package profileservice

import (
    "testing"
    "time"
)

func TestGetUserByID(t *testing.T) {
    userRepo := &MockUserRepo{}
    service := NewProfileService(userRepo)

    // Test for ID = 1
    expectedUser := &User{
        ID:        1,
        Name:      "John",
        Age:       30,
        CreatedAt: time.Now(),
    }
    userRepo.On("GetUserByID", 1).Return(expectedUser, nil)

    user, err := service.GetUserByID(1)
    if err != nil {
        t.Errorf("Unexpected error: %v", err)
    }
    if user.Name != expectedUser.Name {
        t.Errorf("Expected user name %s, got %s", expectedUser.Name, user.Name)
    }

    // Test for ID = 2
    expectedUser = &User{
        ID:        2,
        Name:      "Mary",
        Age:       25,
        CreatedAt: time.Now(),
    }
    userRepo.On("GetUserByID", 2).Return(expectedUser, nil)

    user, err = service.GetUserByID(2)
    if err != nil {
        t.Errorf("Unexpected error: %v", err)
    }
    if user.Name != expectedUser.Name {
        t.Errorf("Expected user name %s, got %s", expectedUser.Name, user.Name)
    }
}

type MockUserRepo struct {
    mock.Mock
}

func (m *MockUserRepo) GetUserByID(id int) (*User, error) {
    args := m.Called(id)
    return args.Get(0).(*User), args.Error(1)
}

這個測試程式使用了模擬 (mock) 的方式模擬 UserRepo.GetUserByID 方法的行為，並對 ProfileService.GetUserByID 方法進行了兩次測試，分別測試輸入 ID 為 1 和 2 的情況。


提問十一

幫我寫一個SpringBoot的cronjob排程，其可在每天凌晨1點30分觸發去呼叫MessageLogService.deleteLessThen方法來刪除七天以前的log訊息，並在完成作業後發送一封通知信給admin@abc.com告知排程作業已完成。

GhatGPT：

以下是使用 SpringBoot 實現上述排程的範例程式碼：

package com.example.demo;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component
public class CronjobScheduler {

    @Autowired
    private MessageLogService messageLogService;

    @Scheduled(cron = "0 30 1 * * *")
    public void deleteOldLogs() {
        messageLogService.deleteLessThen(7);
        sendNotificationEmail("admin@abc.com", "Cronjob completed", "Deletion of logs older than 7 days completed.");
    }

    private void sendNotificationEmail(String to, String subject, String body) {
        // Code to send email notification goes here
    }
}

請注意，這個排程類需要在您的 SpringBoot 項目中正確設置才能正常工作。


提問十二

幫我寫一個SpringBoot Controller方法可處理api /user/{id}，此api會根據傳入的path variable {id}取得使用者[User]資料，且此api方法有利用SpringBoot annotation 做Redis快取

GhatGPT：

以下是可以處理 /user/{id} 的 Spring Boot Controller 方法範例，此範例使用 Spring Boot 的 Cache 注解來實現快取功能：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class UserController {

  @Autowired
  private UserRepository userRepository;

  @Cacheable(value = "users", key = "#id")
  @GetMapping("/user/{id}")
  public User getUser(@PathVariable Long id) {
    return userRepository.findById(id).orElse(null);
  }
}

解釋一下這段程式碼：

  • 首先，使用 @Autowired 注入 UserRepository 實例。
  • 然後，在 @GetMapping("/user/{id}") 方法上加上 @Cacheable 注解，這樣就會將方法的結果存入快取中。@Cacheable 注解的 value 屬性指定了快取的名稱，key 屬性指定了對應的 key。在這個範例中，value 屬性設為 "users"，key 屬性設為 "#id"，這意味著將使用者的 id 作為 key 存入 "users" 快取中。
  • 最後，使用 UserRepository 的 findById() 方法從資料庫中取得該使用者資料。

希望這段程式碼能幫助您理解如何使用 Spring Boot 的 Cache 注解來實現快取功能。


提問十三

幫我建立一個以Clean Architecture為基礎的Go網路應用程式目錄結構，domain為Employee，接收client請求的程式集中在handler，此應用程式存取PostgreSQL資料庫。

GhatGPT：

以下是一個以 Clean Architecture 為基礎的 Go 網路應用程式目錄結構的範例，其中 domain 為 Employee，handler 負責接收 client 的請求，並與 PostgreSQL 資料庫交互：

├── cmd
│   ├── api
│   │   ├── main.go
│   ├── worker
│   │   ├── main.go
├── internal
│   ├── app
│   │   ├── api
│   │   ├── worker
│   ├── domain
│   │   ├── employee
│   ├── infrastructure
│   │   ├── postgres
│   ├── interface
│   │   ├── handler
│   ├── usecase
│   ├── factory
├── pkg
│   ├── errors
│   ├── logger
├── go.mod
├── go.sum

解釋一下這個目錄結構：

  • cmd 目錄包含應用程式的入口點，也就是 main 函式所在的檔案。在這個範例中，有兩個入口點：api 和 worker。
  • internal 目錄包含應用程式的核心功能，包括 domain 層、infrastructure 層、interface 層和 usecase 層。
  • domain 層包含應用程式的邏輯，也就是 employee 類型和相關的方法。
  • infrastructure 層包含與外部系統交互的功能，例如與 PostgreSQL 資料庫交互的程式。
  • interface 層包含與外界交互的介面，例如接收 client 請求的 handler。
  • usecase 層包含呼叫 domain 類別方法的函式。
  • factory 層包含建立 domain 層和 infrastructure 層物件的函式。
  • pkg 目錄包含應用程式所使用的共用函式庫，例如錯誤處理函式和日


提問十四

和心儀的對象聊天，對方總是聊沒兩句就說要去洗澡就結束對話了，該怎麼增加彼此聊天的熱度呢？

GhatGPT：

如果你和心儀的對象聊天時，對方總是聊沒兩句就說要去洗澡就結束對話了，你可以考慮以下幾種方式增加彼此聊天的熱度：

  • 尋找共同的興趣：嘗試找出你們共同的興趣，並聊聊相關的話題。例如：“你喜歡看什麼電影？我最近看了一部很棒的電影，你想不想一起討論一下？”
  • 分享你的生活經歷：分享你的生活經歷，讓對方了解你的個人故事。例如：“你知道嗎？我兒時曾經去過南極，那裡的冰雪風光真的很壯觀。你有什麼冒險的經歷嗎？”
  • 詢問對方的想法：詢問對方的想法，並且討論彼此的觀點。例如：“你怎麼看待最近發生的這件事？我覺得……”
  • 請求對方的幫助：如果你遇到了困難，可以請求對方的幫助。例如：“我最近在為這件事煩惱，你有什麼好建議嗎？”


提問十五

幫我產生一個Java的方法validateEmail(String email)用來驗證輸入的字串`email`是否為合法的email，請利用正則表示式來驗證

GhatGPT：

下面是一個使用正則表示式來驗證輸入的字串是否為合法的email的Java方法：

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class EmailValidator {

    private static final String EMAIL_REGEX = "^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,6}$";

    public static boolean validateEmail(String email) {
        Pattern pattern = Pattern.compile(EMAIL_REGEX);
        Matcher matcher = pattern.matcher(email);
        return matcher.matches();
    }
}

這個方法定義了一個名為validateEmail的靜態方法，接收一個字符串參數email，並返回一個布林值。

方法中首先定義了一個名為EMAIL_REGEX的字符串常量，其值為用來驗證email的正則表示式。然後，使用這個正則表示式來創建一個Pattern對象，再使用輸入的字符串email創建一個Matcher對象。最後，呼叫Matcher對象的matches方法


提問十六

幫我建立Spring Data JPA的entity `Employee`及`Department`，一個Department會有個Employee，兩者可互相參照，但要lazy loading

GhatGPT：

下面是為你建立的Spring Data JPA的entity Employee及Department：

iimport javax.persistence.*;

@Entity
public class Employee {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String name;
    private String jobTitle;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "department_id")
    private Department department;

    // 省略getters和setters
}

@Entity
public class Department {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String name;

    @OneToMany(mappedBy = "department", fetch = FetchType.LAZY)
    private List<Employee> employees;

    // 省略getters和setters
}

在這個實現中，Employee和Department之間建立了多對一的關係，即一個部門有多名員工，但一個員工只屬於一個部門。多對一關係由@ManyToOne注解來標記，而一對多關係則由@OneToMany注解來標記。此外，我們還使用了@JoinColumn注解來指定外鍵列，並使用fetch = FetchType.LAZY來設置lazy loading。



提問十七

幫我寫一段可撈取PostgreSQL Employee資料表的SQL，且Employee會以`department_id`去join Department的欄位。

GhatGPT：

下面是可撈取PostgreSQL Employee資料表的SQL，且Employee會以department_id去join Department的欄位：

SELECT e.*, d.name as department_name
FROM employee e
LEFT JOIN department d ON e.department_id = d.id

這段SQL會從Employee資料表中撈取所有資料，並使用LEFT JOIN語句將Employee資料表和Department資料表按照department_id這個欄位進行join，並將Department資料表中的name欄位重新命名為department_name。最終會得到的結果集包含Employee資料表的所有欄位，以及Department資料表的name欄位。

注意：請確保在使用這段SQL之前，已經建立了Employee和Department資料表，並在其中插入了足夠的資料。


提問十八

幫我產生一段上傳表單圖片到後端 api `/image` 的JavaScript ES6的程式

GhatGPT：

下面是一段JavaScript ES6的程式，可以用來上傳表單圖片到後端 api /image：

const formData = new FormData();
formData.append('image', imageFile);

fetch('/api/image', {
  method: 'POST',
  body: formData,
})
  .then(res => res.json())
  .then(data => {
    console.log('圖片上傳成功');
  })
  .catch(error => {
    console.error('圖片上傳失敗', error);
  });

這段程式會創建一個新的FormData物件，並使用append方法將圖片文件添加到表單資料中。接著，使用fetch函數向後端api /api/image發送POST請求，並將表單資料作為請求的body傳遞。如果請求成功，則會在console中顯示"圖片上傳成功"；如果請求失敗，則會在console中顯示"圖片上傳失敗"。

注意：請確保你的應用程式已經設置好了CORS（跨域資源共用）設置，以便從網頁向後端api發送請求。此外，請確保imageFile變數已經設置為要上傳的圖片文件。



提問十九

how spring boot deal with http request and response with json format

GhatGPT

Spring Boot makes it easy to handle HTTP requests and responses in JSON format by using a combination of the Spring MVC framework and the Jackson library.

When a client sends an HTTP request to a Spring Boot application, the request is handled by a controller. The controller is a class that is annotated with the @RestController annotation, which is a combination of the @Controller and @ResponseBody annotations. This tells Spring that the class should handle HTTP requests and that the return value of a method in the class should be used as the response body.

By default, Spring Boot will automatically convert the return value of a controller method to JSON format using the Jackson library. This is done by configuring Spring MVC to use a Jackson 2HttpMessageConverter, which is added to the message converters list in the MVC configuration.

On the other hand, when the client send a request with json body, Spring will automatically convert json object to object representation by using the same message converter based on the request header "Content-Type", this can be achieved by adding @RequestBody on the parameter of the controller method.

n order to use Jackson for JSON marshalling in Spring Boot, you should include the following dependency in your build configuration:

<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-databind</artifactId>
</dependency>

In summary, Spring Boot automatically handle the request and response json format by using the combination of Spring MVC framework and the Jackson library, and you can control it by adding @RestController, @RequestBody and make sure you have the right dependencies.


提問二十

can you have a hello world example

GhatGPT

Sure! Here's a simple example of a "Hello, World!" RESTful web service using Spring Boot:

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    @GetMapping("/hello")
    public String hello() {
        return "Hello, World!";
    }
}

This is a basic controller class that maps the /hello endpoint to a method called hello(). The hello() method simply returns a string "Hello, World!". The @RestController annotation is a combination of @Controller and @ResponseBody, meaning that this class will handle HTTP requests and the return value of the methods will be used as the response body.

To test this endpoint, you can start the Spring Boot application and then send a GET request to http://localhost:8080/hello. You should get the response "Hello, World!".

You can also test it by using a tool such as curl or httpie:

curl http://localhost:8080/hello

And the output should be :

"Hello, World!"

You can also test it by using any web browser and type the url http://localhost:8080/hello

This is a simple example of how to create a RESTful web service using Spring Boot, keep in mind that this example doesn't include the main class and dependencies for spring boot, which you can find it in the official documentation and in many tutorial online.


提問二十一

can you have another example with json response?

GhatGPT

Sure! Here's an example of a RESTful web service that returns a JSON response using Spring Boot:

import java.util.HashMap;
import java.util.Map;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    @GetMapping("/hello")
    public Map<String, String> hello() {
        Map<String, String> response = new HashMap<>();
        response.put("message", "Hello, World!");
        return response;
    }
}

his is similar to the previous example, but this time the hello() method returns a Map object instead of a String. This Map object will be converted to a JSON object by Spring Boot, since we are returning the object from the method annotated with @RestController. When you test this endpoint by sending a GET request to http://localhost:8080/hello, you should get a JSON response like this:

You can also test it by using a tool such as curl or httpie:

{
    "message": "Hello, World!"
}

Keep in mind that this is a simple example and in real-world application you would typically return more complex data structures, but this example serves to illustrate how Spring Boot automatically converts the return value to a JSON response.

Just like before, you can test this endpoint by using a tool such as curl or httpie:

curl http://localhost:8080/hello

And the output should be something like this:

{
   "message": "Hello, World!"
}

And again, make sure that the spring boot application is running before testing this endpoints.


提問二十二

how to configure two datasources in s SpringBoot project

GhatGPT

In a Spring Boot project, you can configure multiple data sources by creating multiple DataSource beans, each with its own configuration. Here's an example of how you might configure two data sources in a Spring Boot application:

  1. Add the required dependencies to your pom.xml file. You'll need to add the following dependencies to your project:

        <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jdbc</artifactId>
    </dependency>

    <dependency>
        <groupId>com.zaxxer</groupId>
        <artifactId>HikariCP</artifactId>
    </dependency>

  2. Create properties files for each data source, for example datasource1.properties and datasource2.properties. Add properties such as driver class name, URL, username, and password for each data source.

  3. Create two configuration classes, each annotated with @Configuration and @PropertySource to read the properties files and load the properties of each data source.

    @Configuration
@PropertySource("classpath:datasource1.properties")
public class DataSource1Config {
   //configurations for data source 1 
}

@Configuration
@PropertySource("classpath:datasource2.properties")
public class DataSource2Config {
   //configurations for data source 2 
}

  4. In each of the configuration classes, create a DataSource bean using the properties defined in the properties file. You can use HikariDataSource for example, as it is a fast and reliable data source.

    @Bean
@ConfigurationProperties(prefix = "datasource1.datasource")
public DataSource dataSource1() {
    return DataSourceBuilder.create().type(HikariDataSource.class).build();
}

    and

    @Bean
@ConfigurationProperties(prefix = "datasource2.datasource")
public DataSource dataSource2() {
    return DataSourceBuilder.create().type(HikariDataSource.class).build();
}

  5. Autowire the data sources wherever you need them in your code and use them as appropriate, for example:

    @Autowired
private DataSource dataSource1;

@Autowired
private DataSource dataSource2;

  6. You can also use JdbcTemplate for each data source

    @Bean
public JdbcTemplate jdbcTemplate1()


提問二十三

did you finish the answer about two datasources?

GhatGPT

My apologies, I did not finish the answer. Here is the continuation:

You can also use JdbcTemplate for each data source

@Bean
public JdbcTemplate jdbcTemplate1() {
    return new JdbcTemplate(dataSource1);
}

@Bean
public JdbcTemplate jdbcTemplate2() {
    return new JdbcTemplate(dataSource2);
}

To use JdbcTemplate in your Service class you need to Autowired them

@Autowired
private JdbcTemplate jdbcTemplate1;

@Autowired
private JdbcTemplate jdbcTemplate2;

It's important to note that you should use separate transaction managers for each data source so that each data source can be managed separately. You can create PlatformTransactionManager bean for each data source and use them accordingly.

Also, with above configuration, Spring Boot will automatically manage the data sources and connection pools for you, so you don't have to worry about creating and closing connections.

In addition, if you need to use multiple transaction manager, you can use @Primary on the primary data source or @Qualifier to specify the required transaction manager. Please let me know if you have any question or need further details.

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