springboot+mybatis-plus集成

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在ORM框架中,也经常使用mybatis-plus,下面记录下springboot+mybaits-plus集成:

官网: https://baomidou.com/

1. 创建工程并在pom中添加引用

<dependencies>
        <!--注入web-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.3.5.RELEASE</version>
        </dependency>
        <!--注入lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.14</version>
        </dependency>
        <!--knife4j swagger-->
        <dependency>
            <groupId>com.github.xiaoymin</groupId>
            <artifactId>knife4j-spring-boot-starter</artifactId>
            <version>3.0.3</version>
            <exclusions>
                <exclusion>
                    <artifactId>swagger-annotations</artifactId>
                    <groupId>io.swagger</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <artifactId>swagger-annotations</artifactId>
            <groupId>io.swagger</groupId>
            <version>1.5.22</version>
        </dependency>

        <!-- 加载mysql驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.18</version>
        </dependency>
        <!-- 加载jdbc连接数据库 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
            <version>2.3.6.RELEASE</version>
        </dependency>
        <!-- mybatis plus 代码生成器 -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.1</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.5.2</version>
        </dependency>
        <dependency>
            <groupId>org.freemarker</groupId>
            <artifactId>freemarker</artifactId>
            <version>2.3.28</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.47</version>
        </dependency>
        <!--测试包-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter-test</artifactId>
            <version>3.5.1</version>
        </dependency>
    </dependencies>

2.yaml配置文件中添加数据库配置

server:
  port: 8080
  servlet:
    path: /

# DataSource config 数据库配置
spring:
  datasource:
    name: mysql
    url: jdbc:mysql://127.0.0.1:3306/devdatabase?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8
    username: devuser
    password: admin
    driver-class-name: com.mysql.cj.jdbc.Driver

3.在mysql数据库中创建数据库表

CREATE TABLE `buyr_user` (
  `USER_ID` bigint(19) unsigned NOT NULL AUTO_INCREMENT COMMENT '用户ID',
  `USER_NAME` varchar(90) NOT NULL COMMENT '用户名称',
  `NICK_NAME` varchar(90) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL COMMENT '用户昵称',
  `USER_INTRO` varchar(300) DEFAULT NULL COMMENT '个性签名',
  `AVATAR` varchar(1000) DEFAULT NULL COMMENT '头像图片',
  `EMAIL` varchar(255) DEFAULT NULL COMMENT '邮件地址',
  `PHONE` varchar(255) DEFAULT NULL COMMENT '手机号',
  `USER_PASS` varchar(255) DEFAULT NULL COMMENT '密码',
  `PASS_SALT` varchar(255) DEFAULT NULL COMMENT '密码盐',
  `USER_STATUS` varchar(32) DEFAULT '1' COMMENT '用户状态',
  `USER_SCORE` int(11) DEFAULT NULL COMMENT '用户打分',
  `TOTAL_COST_AMT` decimal(24,6) DEFAULT NULL COMMENT '累计消费金额',
  `LAST_LOGIN_TIME` timestamp NULL DEFAULT NULL COMMENT '最后登录时间',
  `REVISION` int(11) DEFAULT NULL COMMENT '乐观锁',
  `CREATED_BY` varchar(32) DEFAULT NULL COMMENT '创建人',
  `CREATED_TIME` timestamp NULL DEFAULT NULL COMMENT '创建时间',
  `UPDATED_BY` varchar(32) DEFAULT NULL COMMENT '更新人',
  `UPDATED_TIME` timestamp NULL DEFAULT NULL COMMENT '更新时间',
  PRIMARY KEY (`USER_ID`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COMMENT='买家';

4.启动类上添加@MapperScan 注解

package com.mybatisplusdemo;

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

@MapperScan(value = "com.mybatisplusdemo.mapper")
@SpringBootApplication
public class MybatisPlusDemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(MybatisPlusDemoApplication.class, args);
    }
}

6.添加分页配置类

package com.mybatisplusdemo.config;

import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.annotation.EnableTransactionManagement;

/**
 * mybatisPlus分页插件配置类
 */
@EnableTransactionManagement
@Configuration
public class MybatisPlusConfig {

    /**
     * 分页拦截器
     */
    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor() {
        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
        interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));
        return interceptor;
    }

}

7.添加代码生成器

package com.mybatisplusdemo.config;

import com.baomidou.mybatisplus.generator.FastAutoGenerator;
import com.baomidou.mybatisplus.generator.config.OutputFile;
import com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine;

import java.util.Collections;

/**
 * mybatis-plus 代码生成器
 */
public class MybatisPlusGenerator {
    /**
     * 包名
     */
    private static final String PACKAGE_NAME = "com.mybatisplusdemo";
    /**
     * 模块名称
     */
    private static final String MODULE_NAME = "mybatisPlus-demo";
    /**
     * 输出文件的路径
     */
    private static final String OUT_PATH = "//mybatisPlus-demo//src//main//java";
    /**
     * xml输出文件的路径
     */
    private static final String XML_OUT_PATH = "//mybatisPlus-demo//src//main//resources//mapper";
    /**
     * 代码生成者
     */
    private static final String AUTHOR = "author";

    /**
     * JDBC相关配置
     */
    private static final String DRIVER = "com.mysql.cj.jdbc.Driver";
    private static final String URL = "jdbc:mysql://127.0.0.1:3306/devdatabase?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8";
    private static final String USER_NAME = "devuser";
    private static final String PASSWORD = "admin";

    /**
     * <p>
     * MySQL 生成演示
     * </p>
     */
    public static void main(String[] args) {
        MybatisPlusGenerator generator = MybatisPlusGenerator.getSingle();
        generator.autoGeneration();
    }

    private static MybatisPlusGenerator single = null;

    private MybatisPlusGenerator() {
        super();
    }

    private static MybatisPlusGenerator getSingle() {
        if (single == null) {
            single = new MybatisPlusGenerator();
        }
        return single;
    }

    public void autoGeneration() {
        String projectBaseUrl = System.getProperty("user.dir");
        String outputDir = projectBaseUrl + OUT_PATH;
        String xmlOutputDir = projectBaseUrl + XML_OUT_PATH;
        FastAutoGenerator.create(URL, USER_NAME, PASSWORD)
                .globalConfig(builder -> {
                    builder.author(AUTHOR) // 设置作者
                            .enableSwagger() // 开启 swagger 模式
                            .outputDir(outputDir); // 指定输出目录
                })
                .packageConfig(builder -> {
                    builder.parent(PACKAGE_NAME) // 设置父包名
//                            .moduleName(MODULE_NAME) // 设置父包模块名
                            .pathInfo(Collections.singletonMap(OutputFile.xml, xmlOutputDir)); // 设置mapperXml生成路径
                })
                .strategyConfig(builder -> {
                    builder.addInclude("buyr_user") // 设置需要生成的表名
                            .addTablePrefix("buyr_"); // 设置过滤表前缀
                })
                .templateEngine(new FreemarkerTemplateEngine()) // 使用Freemarker引擎模板，默认的是Velocity引擎模板
                .execute();
    }
}

运行代码生成器MybatisPlusGenerator 的main方法即可生成对应的java代码文件和xml配置文件

生成后的代码结构如下:

即可调用对应的service接口的CRUD的方法.

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