init demo

pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.unicom</groupId>
+    <artifactId>jtjsc-backend</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <packaging>jar</packaging>
+    <name>jtjsc-backend</name>
+    <description>交通驾驶舱后端</description>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-parent</artifactId>
+        <version>2.5.4</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+    <dependencies>
+        <!-- Spring Web -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <!-- MySQL Driver -->
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <scope>runtime</scope>
+        </dependency>
+        <!-- MyBatis-Plus Starter -->
+        <dependency>
+            <groupId>com.baomidou</groupId>
+            <artifactId>mybatis-plus-boot-starter</artifactId>
+            <version>3.4.3.4</version>
+        </dependency>
+        <!-- Spring Boot Test -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <!-- Lombok -->
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <version>1.18.22</version>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+</project>

src/main/java/com/unicom/JtjscBackend.java

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+package com.unicom;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class JtjscBackend {
+
+    public static void main(String[] args) {
+        SpringApplication.run(JtjscBackend.class, args);
+    }
+}

src/main/java/com/unicom/test/controller/UserController.java

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+package com.unicom.test.controller;
+
+import com.unicom.test.entity.User;
+import com.unicom.test.service.UserService;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/users")
+@Slf4j
+public class UserController {
+
+    @Autowired
+    private UserService userService;
+
+    @GetMapping("/")
+    public List<User> list() {
+        return userService.list();
+    }
+
+    // 插入用户
+    @PostMapping("/")
+    public String insertUser(@RequestBody User user) {
+        if (userService.insertUser(user)) {
+            return "User inserted successfully";
+        } else {
+            return "Failed to insert user";
+        }
+    }
+
+    // 根据 ID 查询用户
+    @GetMapping("/{id}")
+    public User getUserById(@PathVariable Long id) {
+        log.info("getUserById");
+        return userService.getUserById(id);
+    }
+
+//    // 查询所有用户
+//    @GetMapping("/")
+//    public List<User> getAllUsers() {
+//        return userService.getAllUsers();
+//    }
+
+    // 根据条件查询用户
+    @GetMapping("/search")
+    public List<User> getUsersByCondition(@RequestParam(required = false) String name) {
+        return userService.getUsersByCondition(name);
+    }
+
+    // 分页查询用户
+    @GetMapping("/page")
+    public Object getUsersByPage(@RequestParam int pageNum, @RequestParam int pageSize) {
+        return userService.getUsersByPage(pageNum, pageSize);
+    }
+
+    // 更新用户信息
+    @PutMapping("/")
+    public String updateUser(@RequestBody User user) {
+        if (userService.updateUser(user)) {
+            return "User updated successfully";
+        } else {
+            return "Failed to update user";
+        }
+    }
+
+    // 删除用户
+    @DeleteMapping("/{id}")
+    public String deleteUser(@PathVariable Long id) {
+        if (userService.deleteUser(id)) {
+            return "User deleted successfully";
+        } else {
+            return "Failed to delete user";
+        }
+    }
+}

src/main/java/com/unicom/test/dao/UserMapper.java

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+package com.unicom.test.dao;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.unicom.test.entity.User;
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
+
+import java.util.List;
+
+@Mapper
+public interface UserMapper extends BaseMapper<User> {
+
+    // 自定义插入用户的方法
+    int insertUser(User user);
+
+    // 自定义根据 ID 查询用户的方法
+    User selectUserById(Long id);
+
+    // 自定义查询所有用户的方法
+    List<User> selectAllUsers();
+
+    // 自定义更新用户的方法
+    int updateUser(User user);
+
+    // 自定义删除用户的方法
+    int deleteUserById(@Param("id") Long id);
+}

src/main/java/com/unicom/test/entity/User.java

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+package com.unicom.test.entity;
+
+import com.baomidou.mybatisplus.annotation.TableId;
+import com.baomidou.mybatisplus.annotation.TableName;
+import lombok.Data;
+
+@Data
+@TableName("user")
+public class User {
+//    @TableId
+    private Long id;
+    private String name;
+    private Integer age;
+    private String email;
+}

src/main/java/com/unicom/test/service/UserService.java

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+package com.unicom.test.service;
+
+import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
+import com.baomidou.mybatisplus.core.metadata.IPage;
+import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
+import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
+import com.unicom.test.dao.UserMapper;
+import com.unicom.test.entity.User;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public class UserService extends ServiceImpl<UserMapper, User> {
+
+    @Autowired
+    private UserMapper userMapper;
+
+    // 插入用户
+    public boolean insertUser(User user) {
+        try {
+            int rows = userMapper.insert(user);
+            return rows > 0;
+        } catch (Exception e) {
+            // 可以添加日志记录异常信息
+            e.printStackTrace();
+            return false;
+        }
+    }
+
+    // 根据 ID 查询用户
+    public User getUserById(Long id) {
+        try {
+            return userMapper.selectById(id);
+        } catch (Exception e) {
+            // 可以添加日志记录异常信息
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    // 查询所有用户
+    public List<User> getAllUsers() {
+        try {
+            return userMapper.selectList(null);
+        } catch (Exception e) {
+            // 可以添加日志记录异常信息
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    // 根据条件查询用户
+    public List<User> getUsersByCondition(String name) {
+        try {
+            QueryWrapper<User> queryWrapper = new QueryWrapper<>();
+            if (name!= null) {
+                queryWrapper.like("name", name);
+            }
+            return userMapper.selectList(queryWrapper);
+        } catch (Exception e) {
+            // 可以添加日志记录异常信息
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    // 分页查询用户
+    public IPage<User> getUsersByPage(int pageNum, int pageSize) {
+        try {
+            Page<User> page = new Page<>(pageNum, pageSize);
+            return userMapper.selectPage(page, null);
+        } catch (Exception e) {
+            // 可以添加日志记录异常信息
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    // 更新用户信息
+    public boolean updateUser(User user) {
+        try {
+            int rows = userMapper.updateById(user);
+            return rows > 0;
+        } catch (Exception e) {
+            // 可以添加日志记录异常信息
+            e.printStackTrace();
+            return false;
+        }
+    }
+
+    // 删除用户
+    public boolean deleteUser(Long id) {
+        try {
+            int rows = userMapper.deleteById(id);
+            return rows > 0;
+        } catch (Exception e) {
+            // 可以添加日志记录异常信息
+            e.printStackTrace();
+            return false;
+        }
+    }
+}

src/main/resources/application.yml

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+spring:
+  datasource:
+    url: jdbc:mysql://59.110.10.99:53306/jttjsc?useSSL=false&serverTimezone=UTC&allowPublicKeyRetrieval=true
+    username: root
+    password: Unicom@2024
+    driver-class-name: com.mysql.cj.jdbc.Driver
+
+mybatis-plus:
+  mapper-locations: classpath*:/mapper/**.xml
+  configuration:
+    log-impl: org.apache.ibatis.logging.slf4j.Slf4jImpl

src/main/resources/logback-spring.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+        </encoder>
+    </appender>
+    <logger name="com.baomidou.mybatisplus" level="DEBUG" />
+    <logger name="com.unicom" level="DEBUG" />
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

src/main/resources/mapper/test/UserMapper.xml

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+<!DOCTYPE mapper
+        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
+        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+
+<mapper namespace="com.unicom.test.dao.UserMapper">
+
+    <!-- 插入用户 -->
+    <insert id="insertUser" parameterType="com.unicom.test.entity.User">
+        INSERT INTO user (name, age, email)
+        VALUES (#{name}, #{age}, #{email})
+    </insert>
+
+    <!-- 根据 ID 查询用户 -->
+    <select id="selectUserById" resultType="com.unicom.test.entity.User">
+        SELECT id, name, age, email
+        FROM user
+        WHERE id = #{id}
+    </select>
+
+    <!-- 查询所有用户 -->
+    <select id="selectAllUsers" resultType="com.unicom.test.entity.User">
+        SELECT id, name, age, email
+        FROM user
+    </select>
+
+    <!-- 更新用户信息 -->
+    <update id="updateUser" parameterType="com.unicom.test.entity.User">
+        UPDATE user
+        SET name = #{name}, age = #{age}, email = #{email}
+        WHERE id = #{id}
+    </update>
+
+    <!-- 删除用户 -->
+    <delete id="deleteUserById" parameterType="java.lang.Long">
+        DELETE FROM user
+        WHERE id = #{id}
+    </delete>
+</mapper>