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‎spring-boot-postgresql-mybatis-xml-crud/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
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https://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>3.0.1</version>
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<relativePath/> <!-- lookup parent from repository -->
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</parent>
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<groupId>com.knf.dev.demo</groupId>
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<artifactId>spring-boot-postgresql-mybatis-xml-crud</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<name>spring-boot-postgresql-mybatis-xml-crud</name>
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<description>Demo project for Spring Boot</description>
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<properties>
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<java.version>17</java.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<dependency>
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<groupId>org.mybatis.spring.boot</groupId>
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<artifactId>mybatis-spring-boot-starter</artifactId>
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<version>3.0.0</version>
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</dependency>
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<dependency>
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<groupId>org.postgresql</groupId>
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<artifactId>postgresql</artifactId>
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<scope>runtime</scope>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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</project>

‎spring-boot-postgresql-mybatis-xml-crud/src/main/java/com/knf/dev/demo/Application.java‎

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package com.knf.dev.demo;
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import org.mybatis.spring.annotation.MapperScan;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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@SpringBootApplication
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@MapperScan("com.knf.dev.demo.repository")
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public class Application {
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public static void main(String[] args) {
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SpringApplication.run(Application.class, args);
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}
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}

‎spring-boot-postgresql-mybatis-xml-crud/src/main/java/com/knf/dev/demo/controller/UserController.java‎

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package com.knf.dev.demo.controller;
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import com.knf.dev.demo.exception.ResourceNotFoundException;
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import com.knf.dev.demo.model.User;
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import com.knf.dev.demo.repository.UserRepository;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.web.bind.annotation.*;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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@RestController
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@RequestMapping("/api/v1/")
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public class UserController {
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@Autowired
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private UserRepository userRepository;
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// get all users
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@GetMapping("/users")
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public List<User> getAllUsers()
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{
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return userRepository.findAll();
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}
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// create user rest API
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@PostMapping("/users")
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public Map<String, Boolean> createUser(@RequestBody User user) {
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Map<String, Boolean> response = new HashMap<>();
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Boolean bool = userRepository.insert(user) > 0 ?
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response.put("created", Boolean.TRUE) :
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response.put("created", Boolean.FALSE);
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return response;
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}
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// get user by id rest api
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@GetMapping("/users/{id}")
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public User findUserById(@PathVariable Integer id) {
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User user = userRepository.findById(id).
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orElseThrow(() -> new ResourceNotFoundException
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("User not exist with id :" + id));
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return user;
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}
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// update user rest api
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@PutMapping("/users/{id}")
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public Map<String, Boolean> updateUser(@PathVariable Integer id,
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@RequestBody User userDetails) {
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User user = userRepository.findById(id)
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.orElseThrow(() -> new ResourceNotFoundException
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("User not exist with id :" + id));
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userDetails.setId(id);
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Map<String, Boolean> response = new HashMap<>();
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Boolean bool = userRepository.update(userDetails) > 0 ?
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response.put("updated", Boolean.TRUE) :
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response.put("updated", Boolean.FALSE);
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return response;
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}
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// delete user rest api
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@DeleteMapping("/users/{id}")
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public Map<String, Boolean> deleteUser
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(@PathVariable Integer id) {
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User user = userRepository.findById(id)
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.orElseThrow(() -> new ResourceNotFoundException
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("User not exist with id :" + id));
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Map<String, Boolean> response = new HashMap<>();
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Boolean bool = userRepository.deleteById(user.getId()) > 0 ?
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response.put("deleted", Boolean.TRUE) :
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response.put("deleted", Boolean.FALSE);
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return response;
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}
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}

‎spring-boot-postgresql-mybatis-xml-crud/src/main/java/com/knf/dev/demo/exception/CustomErrorResponse.java‎

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package com.knf.dev.demo.exception;
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import com.fasterxml.jackson.annotation.JsonFormat;
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import java.time.LocalDateTime;
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public class CustomErrorResponse {
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@JsonFormat(shape = JsonFormat.Shape.STRING,
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pattern = "yyyy-MM-dd hh:mm:ss")
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private LocalDateTime timestamp;
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private int status;
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private String error;
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public LocalDateTime getTimestamp()
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{
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return timestamp;
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}
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public void setTimestamp(LocalDateTime timestamp)
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{
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this.timestamp = timestamp;
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}
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public int getStatus()
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{
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return status;
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}
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public void setStatus(int status)
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{
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this.status = status;
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}
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public String getError()
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{
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return error;
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}
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public void setError(String error)
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{
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this.error = error;
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}
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}

‎spring-boot-postgresql-mybatis-xml-crud/src/main/java/com/knf/dev/demo/exception/GlobalExceptionHandler.java‎

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package com.knf.dev.demo.exception;
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import org.springframework.http.HttpStatus;
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import org.springframework.http.ResponseEntity;
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import org.springframework.web.bind.annotation.ControllerAdvice;
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import org.springframework.web.bind.annotation.ExceptionHandler;
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import org.springframework.web.context.request.WebRequest;
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import java.time.LocalDateTime;
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@ControllerAdvice
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public class GlobalExceptionHandler {
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@ExceptionHandler(ResourceNotFoundException.class)
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public ResponseEntity<CustomErrorResponse>
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globalExceptionHandler(Exception ex, WebRequest request) {
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CustomErrorResponse errors = new CustomErrorResponse();
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errors.setTimestamp(LocalDateTime.now());
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errors.setError(ex.getMessage());
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errors.setStatus(HttpStatus.NOT_FOUND.value());
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return new ResponseEntity<>(errors, HttpStatus.NOT_FOUND);
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}
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}

‎spring-boot-postgresql-mybatis-xml-crud/src/main/java/com/knf/dev/demo/exception/ResourceNotFoundException.java‎

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package com.knf.dev.demo.exception;
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public class ResourceNotFoundException extends RuntimeException{
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private static final long serialVersionUID = 1L;
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public ResourceNotFoundException(String message) {
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super(message);
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}
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}

‎spring-boot-postgresql-mybatis-xml-crud/src/main/java/com/knf/dev/demo/model/User.java‎

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package com.knf.dev.demo.model;
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public class User {
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private Integer id;
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private String firstName;
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private String lastName;
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private String emailId;
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public User() {
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}
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public User(Integer id,String firstName,
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String lastName, String emailId) {
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super();
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this.id=id;
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this.firstName = firstName;
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this.lastName = lastName;
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this.emailId = emailId;
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}
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public Integer getId() {
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return id;
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}
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public void setId(Integer id) {
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this.id = id;
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}
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public String getFirstName() {
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return firstName;
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}
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public void setFirstName(String firstName) {
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this.firstName = firstName;
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}
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public String getLastName() {
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return lastName;
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}
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public void setLastName(String lastName) {
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this.lastName = lastName;
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}
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public String getEmailId() {
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return emailId;
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}
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public void setEmailId(String emailId) {
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this.emailId = emailId;
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}
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}

‎spring-boot-postgresql-mybatis-xml-crud/src/main/java/com/knf/dev/demo/repository/UserRepository.java‎

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package com.knf.dev.demo.repository;
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import com.knf.dev.demo.model.User;
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import java.util.List;
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import java.util.Optional;
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public interface UserRepository {
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List<User> findAll();
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Optional<User> findById(Integer id);
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int deleteById(Integer id);
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int insert(User user);
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int update(User user);
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}

‎spring-boot-postgresql-mybatis-xml-crud/src/main/resources/application.properties‎

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spring.datasource.url=jdbc:postgresql://localhost:5432/testdb
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spring.datasource.username=postgres
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spring.datasource.password=root
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spring.sql.init.mode=always
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#Configure the xml Mapping path
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mybatis.mapper-locations=classpath:mapper/UserMapper.xml
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#Configure entity category names
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mybatis.type-aliases-package=com.knf.dev.demo.model

‎spring-boot-postgresql-mybatis-xml-crud/src/main/resources/mapper/UserMapper.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE mapper
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PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
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"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
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<mapper namespace="com.knf.dev.demo.repository.UserRepository">
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<resultMap type="user" id="result">
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<id property="id" column="id" />
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<result property="firstName" column="first_name" />
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<result property="lastName" column="last_name" />
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<result property="emailId" column="email_id" />
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</resultMap>
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<select id="findAll" resultType="user" resultMap="result">
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SELECT * FROM users
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</select>
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<insert id="insert" parameterType="user"
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keyProperty="id" useGeneratedKeys="true">
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INSERT INTO users(first_name, last_name, email_id)
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VALUES(#{firstName}, #{lastName}, #{emailId})
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</insert>
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<update id="update" parameterType="user">
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UPDATE users SET first_name = #{firstName},
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email_id = #{emailId}, last_name = #{lastName}
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WHERE id = #{id}
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</update>
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<delete id="deleteById" parameterType="int">
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DELETE FROM users WHERE id = #{id}
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</delete>
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<select id="findById" parameterType="int"
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resultType="user" resultMap="result">
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SELECT * FROM users WHERE id = #{id}
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</select>
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</mapper>

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