Mybatis Plus使用

一、pom.xml

maven引入jar包

parent

	<parent>
	  <groupId>org.springframework.boot</groupId>
	  <artifactId>spring-boot-starter-parent</artifactId>
	  <version>2.6.2</version>
	  <relativePath/>
	</parent>

其他

	<dependency>
	  <groupId>org.springframework.boot</groupId>
	  <artifactId>spring-boot-starter</artifactId>
	</dependency>
	<dependency>
	  <groupId>org.springframework.boot</groupId>
	  <artifactId>spring-boot-starter-test</artifactId>
	  <scope>test</scope>
	</dependency>
	<!--mybatis plus核心包-->
	<dependency>
	  <groupId>com.baomidou</groupId>
	  <artifactId>mybatis-plus-boot-starter</artifactId>
	  <version>3.5.0</version>
	</dependency>
	<!-- mysql驱动包 -->
	<dependency>
	  <groupId>mysql</groupId>
	  <artifactId>mysql-connector-java</artifactId>
	  <version>5.1.49</version>
	</dependency>
	
	<!-- lombok 简化实体类写法  日志功能支持-->
	<dependency>
	  <groupId>org.projectlombok</groupId>
	  <artifactId>lombok</artifactId>
	  <version>1.18.22</version>
	  <scope>provided</scope>
	</dependency>
	
	<dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid-spring-boot-starter</artifactId>
      <version>1.2.8</version>
    </dependency>

二、application.yml

#配置整合druid
spring:
  datasource:
    druid:
      url: jdbc:mysql://localhost:3306/db?useUnicode=true&characterEncoding=utf-8
      username: root
      password: root
      initial-size: 5
      max-active: 20
      min-idle: 10
      max-wait: 10
      #配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
      time-between-eviction-runs-millis: 60000
#配置日志输出
mybatis-plus:
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

三、入门

1.实体类

在主键上添加注解 @TableId

import lombok.Data;
/**
 * @ fileName:User
 * @ description:
 * @ author:makejava
 * @ createTime:2022/7/18 9:51
 * @ version:1.0.0
 */
@SuppressWarnings("serial")
@TableName("user")
@Data
public class User {
	/**
	 * 用户编号
	 */
	@TableId
    private Long id;
    
    /**
	 * 用户名称
	 */
    private String name;
    
    /**
	 * 邮箱
	 */
    private String email;
    
}

2.mapper

import com.sbmp.entity.User;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
/**
 * @ fileName:UserMapper
 * @ description:
 * @ author:makejava
 * @ createTime:2022/7/18 9:53
 * @ version:1.0.0
 */
public interface UserMapper extends BaseMapper<User> {
}

四、自动代码生成

1.jar

	<!--mybatisplus 代码生成器包-->
    <dependency>
      <groupId>com.baomidou</groupId>
      <artifactId>mybatis-plus-generator</artifactId>
      <version>3.5.1</version>
    </dependency>
    <!--默认前端引擎包 不加生成时会报错-->
    <dependency>
      <groupId>org.apache.velocity</groupId>
      <artifactId>velocity-engine-core</artifactId>
      <version>2.3</version>
    </dependency>

2.生成器代码

import com.baomidou.mybatisplus.generator.FastAutoGenerator;
import com.baomidou.mybatisplus.generator.config.OutputFile;
import java.util.Collections;
/**
 * @ fileName:AutoCodeGenerator
 * @ description:
 * @ author:makejava
 * @ createTime:2022/7/19 10:24
 * @ version:1.0.0
 */
public class AutoCodeGenerator {
    public static void main(String[] args) {
        FastAutoGenerator.create("jdbc:mysql://localhost:3306/db",
                "root", "root")
                .globalConfig(builder -> {//全局配置
                    builder.author("baomidou") // 设置作者
                            .enableSwagger() // 开启 swagger 模式
                            .fileOverride() // 覆盖已生成文件
                            .outputDir("D:\idea\springboot_mybatisplus_demo\src\main\java"); // 指定输出目录
                })
                .packageConfig(builder -> {//包配置
                    builder.parent("com") // 设置父包名
                            .moduleName("sbmp") // 设置父包模块名
                            .pathInfo(Collections.singletonMap(OutputFile.mapperXml,
                                    "D:\idea\springboot_mybatisplus_demo\src\main\resources\mapper")); // 设置mapperXml生成路径
                })
                .strategyConfig(builder -> {
                    builder.addInclude("tb_user","sys_menu") // 设置需要生成的表名
                            .addTablePrefix("tb_", "sys_"); // 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();
    }
}

五、spring boot整合mybatis plus

1.mybatis plus分页插件

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;
/**
 * @ fileName:MybatisPlusConfig
 * @ description:
 * @ author:makejava
 * @ createTime:2022/7/19 11:09
 * @ version:1.0.0
 */
@Configuration
public class MybatisPlusConfig {
    /**
     * mybatis plus分页插件配置
     * @return
     */
    @Bean //<bean id=mybatisPlusInterceptor class='com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor'
    public MybatisPlusInterceptor mybatisPlusInterceptor() {
        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
        interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));
        return interceptor;
    }
}

2.分页查询

import com.sbmp.entity.User;
import com.sbmp.mapper.UserMapper;
import com.sbmp.service.IUserService;
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 org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;
import javax.annotation.Resource;
import java.util.Map;

/**
 * 服务实现类
 *
 * @author makejava
 * @since 2022-07-19
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private UserMapper userMapper;
    
    @Override
    public IPage<User> queryPage(Map map) {
        //分页参数设置
        IPage<User> page = new Page<>();
        //设置当前页码  第几页
        page.setCurrent(Long.valueOf(map.get("pageNo") +""));
        //设置每页显示条数
        page.setSize(Long.valueOf(map.get("pageSize") +""));
        //查询封装类
        QueryWrapper queryWrapper =new QueryWrapper();
        //使用加各种参数
        if(!StringUtils.isEmpty(map.get("name"))){
            queryWrapper.like("name", map.get("name"));
        }
        if(!StringUtils.isEmpty(map.get("email"))){
            queryWrapper.like("email", map.get("email"));
        }
        return userMapper.selectPage(page, queryWrapper);
    }
    
}

3.Controller

import com.sbmp.entity.User;
import com.sbmp.service.IUserService;
import com.sbmp.util.Result;
import org.springframework.web.bind.annotation.*;
import org.springframework.stereotype.Controller;
import javax.annotation.Resource;
import java.util.Map;
/**
 * 前端控制器
 *
 * @author makejava
 * @since 2022-07-19
 */
@RestController
@RequestMapping("/user")
public class UserController extends BaseController{
    @Resource
    private IUserService iUserService;

    /**
     * 分页带参查询方法
     * @param map
     * @return
     */
    @PutMapping("page")
    public Result  page(@RequestBody Map  map){
        return success(iUserService.queryPage(map));
    }
}

最后

以上就是标致小海豚为你收集整理的Mybatis PlusMybatis Plus使用一、pom.xml二、application.yml三、入门四、自动代码生成五、spring boot整合mybatis plus的全部内容，希望文章能够帮你解决Mybatis PlusMybatis Plus使用一、pom.xml二、application.yml三、入门四、自动代码生成五、spring boot整合mybatis plus所遇到的程序开发问题。

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