mybatis使用方式（SpringBoot）

1. mybatis的依賴引入

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

2. 啓動類中@MapperScan的註解

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

@SpringBootApplication
@MapperScan(basePackages = "com.***.dataObject.mapper")
public class SellApplication {

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

3. 在mapper接口中寫上方法

    3.1 註解方式——sql直接寫在註解後

public interface ProductCategoryMapper {

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

    3.2 xml方式（mybatis官方並不推崇這種寫法）

        3.2.1 定義方法

public interface ProductCategoryMapper {

    ProductCategory selectByCategoryType(Integer categoryType);
}

        3.2.2 在xml文件中寫上sql

<?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.***.dataObject.mapper.ProductCategoryMapper" >
    <!--type對應實體類-->
    <resultMap id="BaseResultMap" type="com.***.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>

    <!--id對應接口 com.***.dataObject.mapper.ProductCategoryMapper 中的 selectByCategoryType 方法名-->
    <select id="selectByCategoryType" resultMap="BaseResultMap" parameterMap="java.lang.Integer">
        SELECT CATEGORY_ID, CATEGORY_ID, CATEGORY_ID
        FROM PRODUCT_CATEGORY
        WHERE CATEGORY_TYPE = #{CATEGORY_TYPE, JDBCTYPE=INTEGER}
    </select>

</mapper>

        3.2.3 在.yml(或.properties)文件配置xml的位置

#定位xml形式的mapper路徑
mybatis:
  mapper-locations: calsspath:mapper/*.xml