Spring Boot 集成 MyBatis-Plus

本文主要是介绍Spring Boot 集成 MyBatis-Plus，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

原创转载请注明出处：https://www.cnblogs.com/agilestyle/p/15030904.html

Project Directory

Maven Dependency

<?xml version="1.0" encoding="UTF-8"?>
<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.fool</groupId>
    <artifactId>hellomybatisplus</artifactId>
    <version>1.0-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.12.RELEASE</version>
        <relativePath/>
    </parent>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

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

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

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.2.6</version>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.3.1</version>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.4.1</version>
        </dependency>

        <dependency>
            <groupId>org.freemarker</groupId>
            <artifactId>freemarker</artifactId>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

DB Schema

schema.sql

CREATE TABLE `tb_user` (
  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
  `username` varchar(30) DEFAULT NULL,
  `password` varchar(30) DEFAULT NULL,
  `age` int(10) unsigned DEFAULT NULL,
  `create_by` varchar(30) NOT NULL,
  `update_by` varchar(30) NOT NULL,
  `create_time` datetime(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  `update_time` datetime(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3) ON UPDATE CURRENT_TIMESTAMP(3),
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

MyBatis-Plus Code Generator

CodeGenerator.java

package org.fool.mybatisplus.generator;

import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.core.toolkit.StringPool;
import com.baomidou.mybatisplus.generator.AutoGenerator;
import com.baomidou.mybatisplus.generator.InjectionConfig;
import com.baomidou.mybatisplus.generator.config.DataSourceConfig;
import com.baomidou.mybatisplus.generator.config.FileOutConfig;
import com.baomidou.mybatisplus.generator.config.GlobalConfig;
import com.baomidou.mybatisplus.generator.config.PackageConfig;
import com.baomidou.mybatisplus.generator.config.StrategyConfig;
import com.baomidou.mybatisplus.generator.config.TemplateConfig;
import com.baomidou.mybatisplus.generator.config.po.TableInfo;
import com.baomidou.mybatisplus.generator.config.rules.DateType;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
import com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine;

import java.util.ArrayList;
import java.util.List;

public class CodeGenerator {
    public static void main(String[] args) {
        // 代码生成器
        AutoGenerator mpg = new AutoGenerator();

        // 全局配置
        GlobalConfig gc = new GlobalConfig();
        String projectPath = System.getProperty("user.dir");
        gc.setOutputDir(projectPath + "/src/main/java");
        gc.setAuthor("admin");
        gc.setOpen(false);
        gc.setFileOverride(true);
        gc.setIdType(IdType.AUTO);
        gc.setDateType(DateType.ONLY_DATE);
        mpg.setGlobalConfig(gc);

        // 数据源配置
        DataSourceConfig dsc = new DataSourceConfig();
        dsc.setUrl("jdbc:mysql://localhost:3306/test?useUnicode=true&useSSL=false&characterEncoding=utf8");
        dsc.setDriverName("com.mysql.cj.jdbc.Driver");
        dsc.setUsername("root");
        dsc.setPassword("123456");
        dsc.setDbType(DbType.MYSQL);
        mpg.setDataSource(dsc);

        // 包配置
        PackageConfig pc = new PackageConfig();
        pc.setParent("org.fool.mybatisplus");
        pc.setEntity("entity");
        pc.setMapper("mapper");
        mpg.setPackageInfo(pc);

        // 自定义配置
        InjectionConfig cfg = new InjectionConfig() {
            @Override
            public void initMap() {
                // to do nothing
            }
        };

        // 如果模板引擎是 freemarker
        String templatePath = "/templates/mapper.xml.ftl";

        // 自定义输出配置
        List<FileOutConfig> focList = new ArrayList<>();
        // 自定义配置会被优先输出
        focList.add(new FileOutConfig(templatePath) {
            @Override
            public String outputFile(TableInfo tableInfo) {
                // 自定义输出文件名 ， 如果你 Entity 设置了前后缀、此处注意 xml 的名称会跟着发生变化！！
                return projectPath + "/src/main/resources/mapper/" + pc.getModuleName()
                        + "/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
            }
        });
        /*
        cfg.setFileCreate(new IFileCreate() {
            @Override
            public boolean isCreate(ConfigBuilder configBuilder, FileType fileType, String filePath) {
                // 判断自定义文件夹是否需要创建
                checkDir("调用默认方法创建的目录，自定义目录用");
                if (fileType == FileType.MAPPER) {
                    // 已经生成 mapper 文件判断存在，不想重新生成返回 false
                    return !new File(filePath).exists();
                }
                // 允许生成模板文件
                return true;
            }
        });
        */
        cfg.setFileOutConfigList(focList);
        mpg.setCfg(cfg);

        // 配置模板
        TemplateConfig templateConfig = new TemplateConfig();
        templateConfig.setService(null);
        templateConfig.setServiceImpl(null);
        templateConfig.setController(null);
        templateConfig.setXml(null);
        mpg.setTemplate(templateConfig);

        // 策略配置
        StrategyConfig strategy = new StrategyConfig();
        strategy.setNaming(NamingStrategy.underline_to_camel);
        strategy.setColumnNaming(NamingStrategy.underline_to_camel);
        strategy.setEntityLombokModel(true);
        strategy.setEntitySerialVersionUID(false);
        strategy.setInclude("tb_user");
        strategy.setTablePrefix("tb_");
        mpg.setStrategy(strategy);
        mpg.setTemplateEngine(new FreemarkerTemplateEngine());
        mpg.execute();
    }

}

UserMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="org.fool.mybatisplus.mapper.UserMapper">

</mapper>

User.java

package org.fool.mybatisplus.entity;

import com.baomidou.mybatisplus.annotation.TableName;
import com.baomidou.mybatisplus.annotation.IdType;
import java.util.Date;
import com.baomidou.mybatisplus.annotation.TableId;
import java.io.Serializable;
import lombok.Data;
import lombok.EqualsAndHashCode;

/**
 * <p>
 * 
 * </p>
 *
 * @author admin
 * @since 2021-07-19
 */
@Data
@EqualsAndHashCode(callSuper = false)
@TableName("tb_user")
public class User implements Serializable {


    @TableId(value = "id", type = IdType.AUTO)
    private Long id;

    private String username;

    private String password;

    private Integer age;

    private String createBy;

    private String updateBy;

    private Date createTime;

    private Date updateTime;


}

UserMapper.java

package org.fool.mybatisplus.mapper;

import org.fool.mybatisplus.entity.User;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;

/**
 * <p>
 *  Mapper 接口
 * </p>
 *
 * @author admin
 * @since 2021-07-19
 */
public interface UserMapper extends BaseMapper<User> {

}

集成Spring Boot

application.properties

server.port=8080

logging.level.org.fool.mybatisplus=debug

mybatis.mapper-locations=classpath:mapper/**/*.xml

spring.datasource.url=jdbc:mysql://localhost:3306/test?characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useLegacyDatetimeCode=false&serverTimezone=Asia/Shanghai
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.druid.initial-size=5
spring.datasource.druid.max-active=50
spring.datasource.druid.min-idle=5
spring.datasource.druid.max-wait=60000
spring.datasource.druid.min-evictable-idle-time-millis=300000
spring.datasource.druid.validation-query=SELECT 1 FROM DUAL
spring.datasource.druid.test-while-idle=true
spring.datasource.druid.test-on-borrow=false
spring.datasource.druid.test-on-return=false
spring.datasource.druid.filters=stat,wall
spring.datasource.druid.connection-properties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
spring.datasource.druid.use-global-data-source-stat=true

Application.java

package org.fool.mybatisplus;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("org.fool.mybatisplus.mapper")
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

UserService.java

package org.fool.mybatisplus.service;

import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import lombok.extern.slf4j.Slf4j;
import org.fool.mybatisplus.entity.User;
import org.fool.mybatisplus.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
@Slf4j
public class UserService {
    @Autowired
    private UserMapper userMapper;

    @Transactional(rollbackFor = Exception.class)
    public int addUser(User user) {
        user.setCreateBy("admin");
        user.setUpdateBy("admin");
        log.info("user: {}", user);

        return userMapper.insert(user);
    }

    @Transactional(rollbackFor = Exception.class)
    public int updateUser(User user) {
        log.info("user: {}", user);
        return userMapper.updateById(user);
    }

    @Transactional(rollbackFor = Exception.class)
    public int deleteUser(long id) {
        return userMapper.deleteById(id);
    }

    public User getUserById(long id) {
        return userMapper.selectById(id);
    }

    public List<User> getAllUsers() {
        return userMapper.selectList(Wrappers.lambdaQuery());
    }
}

UserController.java

package org.fool.mybatisplus.controller;

import lombok.extern.slf4j.Slf4j;
import org.fool.mybatisplus.entity.User;
import org.fool.mybatisplus.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;
import java.util.Random;

@RestController
@Slf4j
public class UserController {
    @Autowired
    private UserService userService;

    @GetMapping("/get")
    public List<User> get() {
        return userService.getAllUsers();
    }

    @GetMapping("/get/{id}")
    public User getById(@PathVariable long id) {
        return userService.getUserById(id);
    }

    @PostMapping("/add/{count}")
    public String add(@PathVariable int count) {
        int result = 0;
        for (int i = 0; i < count; i++) {
            User user = new User();
            user.setUsername("username" + i);
            user.setPassword("password" + i);
            user.setAge(new Random().nextInt(100));
            result += userService.addUser(user);
        }

        return result == count ? "SUCCESS" : "FAILURE";
    }

    @PutMapping("/update/{id}")
    public String update(@PathVariable long id) {
        User user = new User();
        user.setId(id);
        String temp = "update" + id;
        user.setUsername(temp);
        user.setPassword(temp);
        int result = userService.updateUser(user);

        return result == 1 ? "SUCCESS" : "FAILURE";
    }

    @DeleteMapping("/delete/{id}")
    public String delete(@PathVariable long id) {
        int result = userService.deleteUser(id);

        return result == 1 ? "SUCCESS" : "FAILURE";
    }
}

Test

create

curl --location --request POST 'http://localhost:8080/add/100' \
--header 'Content-Type: application/json' \
--data-raw ''

getAll

curl --location --request GET 'http://localhost:8080/get' \
--header 'Content-Type: application/json' \
--data-raw ''

getById

curl --location --request GET 'http://localhost:8080/get/10' \
--header 'Content-Type: application/json' \
--data-raw ''

update

curl --location --request PUT 'http://localhost:8080/update/2' \
--header 'Content-Type: application/json' \
--data-raw ''

delete

curl --location --request DELETE 'http://localhost:8080/delete/3' \
--header 'Content-Type: application/json' \
--data-raw ''

Reference

https://baomidou.com/guide/generator.html

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Spring Boot 集成 MyBatis-Plus

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