014mybatis注解方式使用

矫情吗；* 2022-03-07 14:48 249阅读 0赞

#### 一、引入依赖 ####

<dependency>
    	<groupId>org.mybatis.spring.boot</groupId>
    	<artifactId>mybatis-spring-boot-starter</artifactId>
    	<version>1.2.0</version>
    </dependency>

#### 二、添加mapper ####

public interface ProductCategoryMapper {
    
        //map方式插入
        @Insert("insert into product_category(category_name,category_type)
        values(#{category_name,jdbcType=VARCHAR},#{category_type,jdbcType=INTEGER})")
        int insertByMap(Map<String,Object> map);
    
        //实体类方式插入
        @Insert("insert into product_category(category_name,category_type)
        values(#{categoryName,jdbcType=VARCHAR},#{categoryType,jdbcType=INTEGER})")
        int insertByObject(ProductCategory productCategory);
    
        //查询
        @Select("select * from product_category where category_type =#{categoryType}")
        @Results({
                @Result(column="category_id",property = "categoryId"),
                @Result(column="category_name",property = "categoryName"),
                @Result(column="category_type",property = "categoryType")
        })
        ProductCategory findByCategoryType(Integer categoryType);
    
        @Select("select * from product_category where category_name =#{categoryName}")
        @Results({
                @Result(column="category_id",property = "categoryId"),
                @Result(column="category_name",property = "categoryName"),
                @Result(column="category_type",property = "categoryType")
        })
        ProductCategory findByCategoryName(String categoryName);
    
        @Update("update product_category set category_name = #{categoryName} where category_type = #{categoryType}")
        int updateByCategoryType(@Param("categoryName") String categoryName,
                                 @Param("categoryType") Integer categoryType);
    
        @Update("update product_category set category_name = #{categoryName} where category_type = #{categoryType}")
        int updateByObject(ProductCategory productCategory);
    
        @Delete("delete from product_category  where category_type = #{categoryType}")
        int deleteByCategoryType(Integer productType);
    
    }

#### 三、添加mapper扫描 ####

@SpringBootApplication
    @MapperScan(basePackages ="com.sell.dataobject.mapper" )
    public class SellApplication {
    
    	public static void main(String[] args) {
    		SpringApplication.run(SellApplication.class, args);
    	}
    }

#### 四、其他 输出sql执行语句 ####

**application.yml添加参数**

logging:
      level:
        com.sell.dataobject.mapper : trace # mybatis输出SQL语句

#### 五、配置添加xml ####

mybatis:
      mapper-locations: classpath:mapper/*.xml  # 配置xml引入：classpath就是resource目录