MyBatis Plus 在复杂查询条件Where中加括号，多个查询条件在括号内

官方给出示例：

and(i -> i.eq("name", "李白").ne("status", "活着"))

---> sql输出结果：and (name = '李白' and status <> '活着')

 QueryWrapper queryWrapper = new QueryWrapper<>();
        queryWrapper.and(query -> query.like(StringUtils.isNotBlank(demo.getName()), "demo.name", demo.getName()).or().
 like(StringUtils.isNotBlank(demo.getFrontId()), "demo.frontId", demo.getFrontId()));
 
 ------> sql输出结果:
 select id, name, frontId from demo where ( turbine.name LIKE '%测%'  OR turbine.frontId LIKE '%测%') 

 QueryWrapper queryWrapper = new QueryWrapper<>();
 queryWrapper.eq("id",demo.getId);
queryWrapper.and(query -> query.like(StringUtils.isNotBlank(demo.getName()), "demo.name", demo.getName()).or().
like(StringUtils.isNotBlank(demo.getFrontId()), "demo.frontId", demo.getFrontId()));
 
 ------> sql输出结果:
 select id, name, frontId from demo where id = 1 and ( turbine.name LIKE '%测%'  OR turbine.frontId LIKE '%测%') 

• 如果QueryWrapper对象没有查询条件，则只会在where语句中添加 （）
• 如果QueryWrapper对象中有查询条件了，会在where语句中自动添加 and(查询条件)