35 lines
1.3 KiB
Java
35 lines
1.3 KiB
Java
package com.example.caseData.dao;
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import com.baomidou.mybatisplus.core.mapper.BaseMapper;
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import com.example.caseData.model.CaseExchangeVoteModel;
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import com.example.caseData.model.CaseExchangeVoteOptionModel;
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import org.apache.ibatis.annotations.Mapper;
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import org.apache.ibatis.annotations.Param;
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import org.apache.ibatis.annotations.Update;
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@Mapper
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public interface CaseExchangeVoteOptionDao extends BaseMapper<CaseExchangeVoteOptionModel> {
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/**
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* Inc 自增
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* @param optionId 文章 ID
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* @param field 字段名称
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* @param numeral 增加的数值
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* @return 更新的行数
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*/
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@Update("UPDATE case_exchange_vote_option SET ${field} = ${field} + #{numeral} WHERE option_id = #{optionId}")
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int inc(@Param("optionId") Long optionId, @Param("field") String field, @Param("numeral") int numeral);
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/**
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* Dec 自减
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*
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* @param optionId 文章 ID
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* @param field 字段名称
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* @param numeral 减少的数值
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* @return 更新的行数
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*/
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@Update("UPDATE case_exchange_vote_option " +
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"SET ${field} = CASE WHEN ${field} >= #{numeral} THEN ${field} - #{numeral} ELSE 0 END " +
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"WHERE option_id = #{optionId}")
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int dec(@Param("optionId") Long optionId, @Param("field") String field, @Param("numeral") int numeral);
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}
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