SpringBoot - Mybatis 快速入门

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

package com.imooc;

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

@SpringBootApplication
@MapperScan(basePackages = "com.imooc.dataobject.mapper")
@EnableCaching
public class SellApplication {

	public static void main(String[] args) {
		SpringApplication.run(SellApplication.class, args);
	}
}

• @MapperScan 注解必须加上。

package com.imooc.dataobject.mapper;

import com.imooc.dataobject.ProductCategory;
import org.apache.ibatis.annotations.*;
import java.util.List;
import java.util.Map;

public interface ProductCategoryMapper {

    @Insert("insert into product_category(category_name, category_type) values (#{categoryName, jdbcType=VARCHAR}, #{category_type, jdbcType=INTEGER})")
    int insertByMap(Map<String, Object> map);

    @Insert("insert into product_category(category_name, category_type) values (#{categoryName, jdbcType=VARCHAR}, #{categoryType, jdbcType=INTEGER})")
    int insertByObject(ProductCategory productCategory);

    @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")
    })
    List<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 categoryType);

    ProductCategory selectByCategoryType(Integer categoryType);
}

<?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.imooc.dataobject.mapper.ProductCategoryMapper" >

    <resultMap id="BaseResultMap" type="com.imooc.dataobject.ProductCategory">
        <id column="category_id" property="categoryId" jdbcType="INTEGER" />
        <id column="category_name" property="categoryName" jdbcType="VARCHAR" />
        <id column="category_type" property="categoryType" jdbcType="INTEGER" />
    </resultMap>

    <select id="selectByCategoryType" resultMap="BaseResultMap" parameterType="java.lang.Integer">
        select category_id, category_name, category_type
        from product_category
        where category_type = #{category_type, jdbcType=INTEGER}
    </select>
</mapper>