QueryWrapper queryWrapper = new QueryWrapper();
queryWrapper .and(wrapper -> wrapper.isNull(“sim”).or().eq(“sim”, “”));
queryWrapper .eq(“is_delete”, “0”);
对应sql语句：
select * from vehicle where (sim is null or sim=’’) and is_delete=‘0’
QueryWrapper queryWrapper = new QueryWrapper();
queryWrapper .eq(“name”,“测试”).or().eq(“sim”,“2”);
对应sql语句：
select * from vehicle where name=‘测试’ or sim=‘2’
