MP中的字段还可以利用函数来查询拼接sql

 //根据value查询@GetMapping("getTest")public List<HashMap> getTest() {QueryWrapper<TTest> queryWrapper = new QueryWrapper<>();queryWrapper.eq("substr(name,1,2)","99999");List<TTest> list1 = testService.list(queryWrapper);List<HashMap> list = dictService.getTest();return list;}