SpringBoot——MyBatisPlus

短命女 2021-10-18 14:36 510阅读 0赞

# 1.引如MyBatisPlus依赖 #

下面是整个pom文件

<?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>com.example</groupId>
        <artifactId>world-address-dao</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <packaging>jar</packaging>
    
        <name>world-address-dao</name>
        <description>Demo project for Spring Boot</description>
    
        <parent>
            <artifactId>world</artifactId>
            <groupId>com.youyou</groupId>
            <version>0.0.1-SNAPSHOT</version>
        </parent>
    
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <java.version>1.8</java.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
            </dependency>
    
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
            </dependency>
    
            
            <dependency>
                <groupId>com.baomidou</groupId>
                <artifactId>mybatis-plus-boot-starter</artifactId>
                <version>3.0.1</version>
            </dependency>
    
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    
    </project>

# 2.定义个实体类 #

这里需要配置一个@TableName

package com.youyou.address.entity;
    
    
    import com.baomidou.mybatisplus.annotation.TableName;
    import lombok.Data;
    
    /**
     * 数据库实体，联系人
     */
    @Data
    @TableName("ts_contacter")
    public class ContacterEO {
        /**
         * 主键
         */
        private String id;
        /**
         * 姓名
         */
        private String name;
    
        /**
         * 性别（0，女；1，男）
         */
        private String sex;
    
        /**
         * 年龄
         */
        private Integer age ;
    
        /**
         * 电话
         */
        private  String phone;
    
        /**
         * 地址
         */
        private String location;
    
        /**
         * 删除（0，未删除；1，删除）
         */
        private String dflag ;
    }

# 3.创建dao #

这里需要继承BaseMapper<>接口，

继承BaseMapper接口之后，会继承一些CRUD方法，我们就可以直接调用了。

package com.youyou.address.dao;
    
    
    import com.baomidou.mybatisplus.core.mapper.BaseMapper;
    import com.youyou.address.entity.ContacterEO;
    
    import java.util.List;
    
    public interface ContacterDao extends BaseMapper<ContacterEO> {
    
    }

# 4.创建service #

package com.youyou.address.service;
    
    import com.youyou.address.dao.ContacterDao;
    import com.youyou.address.entity.ContacterEO;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    import org.springframework.transaction.annotation.Transactional;
    
    import java.util.List;
    
    @Service
    @Transactional
    public class ContacterService {
    
        @Autowired
        private ContacterDao dao;
    
        /**
         * 保存联系人
         *
         * @param contacterEO
         */
        public void saveOne(ContacterEO contacterEO) {
            dao.insert(contacterEO);
        }
    
    
    }

# 5.创建controller #

package com.youyou.address.controller;
    
    import com.youyou.address.entity.ContacterEO;
    import com.youyou.address.service.ContacterService;
    import io.swagger.annotations.Api;
    import io.swagger.annotations.ApiOperation;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import java.util.List;
    
    @Api(description = "联系人接口")
    @RestController
    @RequestMapping(value = "/contacter")
    public class ContacterController {
    
        @Autowired
        private ContacterService service;
    
        @ApiOperation(value = "新增")
        @GetMapping("/add")
        public ContacterEO add(ContacterEO contacterEO) {
            System.out.println("添加一个联系人");
    
            service.saveOne(contacterEO);
    
            return contacterEO;
        }
    
       
    
    }

这样我们就已经配置完成了，无需配置Mapper的XML文件就能使用CRUD方法了。

接下来介绍一下自定义方法的配置。

# 6.配置application.properties文件 #

#设置mapper文件的位置
    mybatis-plus.mapper-locations: classpath*:mapper/*.xml

# 7.创建Mapper文件，文件放到mapper文件夹下。 #

<?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="com.youyou.address.dao.ContacterDao" >
    
        <select id="findAll" resultType="com.youyou.address.entity.ContacterEO">
            select * from ts_contacter
        </select>
    
    </mapper>

SpringBoot——MyBatisPlus

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