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mybatis中使用list作为参数方式

作者:HRX98

在使用MyBatis时,若要在Mapper XML中使用List作为参数,并且collection属性值类型为List,需要注意传入的参数为List时不能使用lists!=null进行判断

mybatis中使用list作为参数

collection属性值类型为List

dao

@Override
    public Integer timeAnalyse(String customerId, LocalDateTime firstDay, LocalDateTime lastDay, String metric ,Integer type) {
        List<String> list = this.getMetrics(metric);
        return baseMapper.countByTime(customerId, firstDay, lastDay, list, type);
    }

    /**
     * 获取指标列表
     * @param metric 指标大类名称
     * @return 指标列表
     */
    private List<String> getMetrics(String metric) {
        List<String> list = new ArrayList<>();
        if (metric.equals(HealthRecordConstant.METRIC_TYPE_WEIGHT)) {
            list.add(HealthRecordConstant.METRIC_TYPE_WEIGHT);
            list.add(HealthRecordConstant.METRIC_TYPE_BMI);
        } else if (metric.equals(HealthRecordConstant.METRIC_TYPE_BLOODPRESSURE)) {
            list.add(HealthRecordConstant.METRIC_TYPE_DIASTOLICPRESSURE);
            list.add(HealthRecordConstant.METRIC_TYPE_HEARTPATEOFBP);
            list.add(HealthRecordConstant.METRIC_TYPE_SYSTOLICPRESSURE);
        } else {
            list.add(HealthRecordConstant.METRIC_TYPE_BGAFTERBREAKFAST);
            list.add(HealthRecordConstant.METRIC_TYPE_BGAFTERDINNER);
            list.add(HealthRecordConstant.METRIC_TYPE_BGAFTERLUNCH);
            list.add(HealthRecordConstant.METRIC_TYPE_BGBEFOREBEDTIME);
            list.add(HealthRecordConstant.METRIC_TYPE_BGBEFOREDAWN);
            list.add(HealthRecordConstant.METRIC_TYPE_BGBEFOREDINNER);
            list.add(HealthRecordConstant.METRIC_TYPE_BGBEFORELUNCH);
            list.add(HealthRecordConstant.METRIC_TYPE_FASTINGBLOODGLUCOSE);
        }
        return list;
    }

mapper

Integer countByTime(@Param("customerId") String customerId,
                     @Param("firstDay") LocalDateTime firstDay,
                     @Param("lastDay") LocalDateTime lastDay,
                     @Param("metrics") List<String> metrics,
                     @Param("type") Integer type);

xml

 <select id="countByTime" resultType="Integer">
        SELECT
            COUNT(*)
        from
            customer_body_metrics
        WHERE
        <if test="type == 0">
            HOUR(create_time) BETWEEN 0 and 8
        </if>
        <if test="type == 1">
            HOUR(create_time) BETWEEN 8 and 16
        </if>
        <if test="type == 2">
            HOUR(create_time) BETWEEN 16 and 24
        </if>

        and
            customer_id = #{customerId}
        and
            create_time > #{firstDay}
        and
            #{lastDay} > create_time
        <if test="metrics.size()>0">
        and
            metric IN
            <foreach collection="metrics" item="value" index="index"  open="(" close=")" separator=",">
                #{value}
            </foreach>
        </if>

    </select>

注意

传入参数为List不能用lists != ‘’ 判断

总结

以上为个人经验,希望能给大家一个参考,也希望大家多多支持脚本之家。

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