SpringBoot整合Mabatis

1、导入 MyBatis 所需要的依赖

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>2.1.1</version>
</dependency>

2、配置数据库连接信息（延用不变，红色必要）　　

spring:
  datasource:
    username: root
    password: 123456
    #?serverTimezone=UTC解决时区的报错
    url: jdbc:mysql://localhost:3306/springboot?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
    driver-class-name: com.mysql.cj.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource

    #Spring Boot 默认是不注入这些属性值的，需要自己绑定
    #druid 数据源专有配置
    initialSize: 5
    minIdle: 5
    maxActive: 20
    maxWait: 60000
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 300000
    validationQuery: SELECT 1 FROM DUAL
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    poolPreparedStatements: true

    #配置监控统计拦截的filters，stat:监控统计、log4j：日志记录、wall：防御sql注入
    #如果允许时报错  java.lang.ClassNotFoundException: org.apache.log4j.Priority
    #则导入 log4j 依赖即可，Maven 地址：https://mvnrepository.com/artifact/log4j/log4j
    filters: stat,wall,log4j
    maxPoolPreparedStatementPerConnectionSize: 20
    useGlobalDataSourceStat: true
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500

3、创建mapper目录以及对应的 Mapper 接口

@Mapper //ibatis的注解,也可以在启动类上用mapperScan代替
@Repository
public interface TestCatMapper {

    List<TestCat> getAllCat();

    TestCat getCatById( Integer catId );

    int addCat( TestCat testCat );

    int updateCat( TestCat testCat );

    int deleteCat( Integer catId );

}

4、对应的Mapper映射文件，用XML就不能在方法上直接写SQL了

<?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.hwl.swgger01.mapper.TestCatMapper">

    <select id="getAllCat" resultType="TestCat">
        select * from test_cat;
    </select>

    <select id="getCatById" resultType="TestCat" parameterType="int">
        select * from test_cat where cat_id = #{catId};
    </select>

    <insert id="addCat" parameterType="TestCat">
        insert into test_cat(cat_name,cat_age,cat_color) value(#{catName},#{catAge},#{catColor});
    </insert>

    <update id="updateCat" parameterType="TestCat">
        update test_cat set cat_name = #{catName} where cat_id = #{catId};
    </update>

    <delete id="delete" parameterType="int">
        delete from test_cat where cat_id = #{catId};
    </delete>

</mapper>

5、编写Controller、service进行测试！

@RestController
@RequestMapping("/cat2")
public class TestCatController2 {

    @Autowired
    TestCatService testCatService;

    @GetMapping("/getAllCat")
    public List<TestCat> getAllCat(){
        return testCatService.getAllCat();
    }

    @GetMapping("/getCatById/{catId}")
    public TestCat getCatById( @PathVariable("catId") Integer catId ){
        return testCatService.getCatById( catId );
    }

    @GetMapping("/add")
    public int addCat(){
        TestCat testCat = new TestCat("花花",2,"黑色");
        return testCatService.addCat( testCat );
    }

    @GetMapping("/update/{catId}")
    public int updateCat( @PathVariable("catId") Integer catId ){
        TestCat testCat = new TestCat("修改猫",catId);
        return testCatService.updateCat( testCat );
    }

    @GetMapping("/deleteCat/{catId}")
    public int deleteCat( @PathVariable("catId") Integer catId ){
        return  testCatService.deleteCat( catId );
    }
}

service:

@Service
public class TestCatService {

    @Autowired
    TestCatMapper testCatMapper;

    public List<TestCat> getAllCat(){
        return testCatMapper.getAllCat();
    }

    public TestCat getCatById( Integer catId ){
        return testCatMapper.getCatById( catId );
    }

    public int addCat( TestCat testCat ){
        return testCatMapper.addCat( testCat );
    }

    public int updateCat( TestCat testCat ){
        return testCatMapper.updateCat( testCat );
    }

    public int deleteCat( Integer catId ){
        return  testCatMapper.deleteCat( catId );
    }
}

6、启动项目访问进行测试！