我就廢話不多說了，大家還是直接看代碼吧~

int count =hrDeliverEmployContractService.selectCount(new EntityWrapper<HrDeliverEmployContractEntity>().eq('pool_id',hrDeliverEmployContract.getPoolId()).andNew().lt('contract_start_date',hrDeliverEmployContract.getContractStartDate()).or().gt('contract_end_date',hrDeliverEmployContract.getContractEndDate()) );對應的SQL

SELECT COUNT(1)FROM hr_deliver_employ_contractWHERE (pool_id = 1) AND (contract_start_date < ’2018-07-01 00:00:00.0’ OR contract_end_date > ’2018-10-31 00:00:00.0’);

補充：mybatis plus or使用

QueryWrapper queryWrapper = new QueryWrapper();queryWrapper .and(wrapper -> wrapper.isNull(“sim”).or().eq(“sim”, “”));queryWrapper .eq(“is_delete”, “0”);對應sql語句

select * from vehicle where (sim is null or sim=’’) and is_delete=‘0’QueryWrapper queryWrapper = new QueryWrapper();queryWrapper .eq(“name”,“測試”).or().eq(“sim”,“2”);對應sql語句

select * from vehicle where name=‘測試’ or sim=‘2’

以上為個人經驗，希望能給大家一個參考，也希望大家多多支持好吧啦網。如有錯誤或未考慮完全的地方，望不吝賜教。