sky-take-out/sky-server/src/main/resources/mapper/DishMapper.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="com.sky.mapper.DishMapper">
<select id="countByCategoryId" resultType="java.lang.Integer">
select count(id)
from dish
where category_id = #{categoryId}
</select>
</mapper>