把 mybatis 整合到其中

product/product-application/src/main/resources/application.yaml

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+spring:
+  # datasource
+  datasource:
+    url: jdbc:mysql://127.0.0.1:33061/mall_product?useSSL=false
+    driver-class-name: com.mysql.jdbc.Driver
+    username: root
+    password: 123456
+
+# mybatis
+mybatis:
+  config-location: classpath:mybatis/mybatis-config.xml
+  mapper-locations: classpath:mybatis/mapper/*.xml
+  type-aliases-package: cn.iocoder.mall.product.dataobject

product/product-application/src/main/resources/mybatis/mapper/ProductCategoryMapper.xml

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+<?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="cn.iocoder.mall.product.dao.ProductSpuMapper">
+
+    <select id="selectById" parameterType="Integer" resultType="ProductSpuDO">
+        SELECT
+          id
+        FROM product_spu
+        WHERE id = #{id}
+    </select>
+
+</mapper>

product/product-application/src/main/resources/mybatis/mybatis-config.xml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
+<configuration>
+
+    <settings>
+        <!-- 使用驼峰命名法转换字段。 -->
+        <setting name="mapUnderscoreToCamelCase" value="true"/>
+    </settings>
+
+    <typeAliases>
+        <typeAlias alias="Integer" type="java.lang.Integer"/>
+        <typeAlias alias="Long" type="java.lang.Long"/>
+        <typeAlias alias="HashMap" type="java.util.HashMap"/>
+        <typeAlias alias="LinkedHashMap" type="java.util.LinkedHashMap"/>
+        <typeAlias alias="ArrayList" type="java.util.ArrayList"/>
+        <typeAlias alias="LinkedList" type="java.util.LinkedList"/>
+    </typeAliases>
+
+</configuration>