mbatis中mysql数据库使用in条件，个数超过1000报错解决方法

springboot-mbatis中mysql数据库使用in条件，个数超过1000报错解决方法

在项目中使用mysql数据库，用到in的查询条件，个数过多的解决方案。例如sql如下：

select * from table where id in (1,2,……10000)，in里面个数超过1000就会报错

解决方案一：把in里面的个数分组，多次查询。最好先排序，能减少查询的时间（有索引的情况下）

List<Long> newAllReceiveIdList = allReceiveIdList.stream().sorted().distinct().collect(Collectors.toList());
List<List<Long>> partitionReceiveIdList = Lists.partition(newAllReceiveIdList, 800);
List<ReceiveBill> receiveBillList = new ArrayList<>();
for (List<Long> singlePartitionReceiveIdList : partitionReceiveIdList) {
    
    
    if(CollUtil.isNotEmpty(singlePartitionReceiveIdList)){
    
    
        LambdaQueryWrapper<ReceiveBill> receiveBillLambdaQueryWrapper = new LambdaQueryWrapper<ReceiveBill>()
            .in(ReceiveBill::getId, singlePartitionReceiveIdList)
            .eq(ReceiveBill::getDeleted, BoolEnum.NO.getKey());
        List<ReceiveBill> billList = receiveBillService.list(receiveBillLambdaQueryWrapper);
        receiveBillList.addAll(billList);
    }
}

解决方案二：直接修改sql，用or隔开

改成类似以下sql：select * from table where id in (1,2,……999）or (1000,1001,…1888)

因为项目中使用了mybatis框架，每个值都是用’,'分隔符隔开，导致最后会多一个逗号,所以需要加上null

select * from table where id in (1,2,……998,null）or (998,1000,1001,…1888)

<if test="bo.receiveIds != null and bo.receiveIds.length != 0">
    and (
    f.id in
    <foreach item='receiveId' index='index' collection='bo.receiveIds' open='(' separator=',' close=')'>
        <if test = 'index%999== 998'>
            null ) or f.id in (
        </if>
        #{receiveId}
    </foreach>
    )
</if>