LambdaQueryWrapper<T>()链式
时间: 2023-10-12 08:04:16 浏览: 90
向<select>元素中动态添加option
LambdaQueryWrapper<T>()链式写法可以简化代码,使代码更加简洁和易读。通过链式写法,可以在一个方法中完成多个查询条件的设置。例如,可以使用eq()方法设置等于条件,ge()方法设置大于等于条件,le()方法设置小于等于条件等等。每个方法都返回LambdaQueryWrapper对象本身,所以可以连续调用多个方法,从而实现多个查询条件的链式设置。最后,可以使用selectOne()方法执行查询操作,并返回符合条件的单个结果。这种链式写法的好处是可以减少代码量,提高开发效率。例如:User user = userMapper.selectOne(new LambdaQueryWrapper<User>().eq(User::getUsername, "zhangsan")); System.out.println(user); [1 [3<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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