ProductDictMapper.xml

<?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.subsidy.mapper.ProductDictMapper">

    <select id="allProducts" parameterType="string" resultType="com.subsidy.model.ProductDictDO">
        SELECT
            *
        FROM
            product_dict t
        WHERE
            t.delete_date IS NULL
            AND t.product_name  like concat('%',#{productName} ,'%')
    </select>

</mapper>