【英语】20岁

博客围绕20多岁女性面临的问题给出建议。谈到持续担忧时,建议将担忧精力用于创造选择;面对青年危机,强调与有相同经历的人交流;对于追求拥有一切,指出应明确自身重要之事,合理排序,不按他人期望生活。

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Being a woman in your 20s is a glorious thing. You’re at a stage where you can take risks in life and in your career, and the possibilities for both are seemingly endless. But that uncertainty can also cause stress, doubt (cough, quarter-life crisis, cough), and anxiety over whether you’ll ever reach your goals or truly have it all. So for all those times you just want to throw up your hands in frustration, this advice is for you. Read on, and know that it’s all going to be OK.

On Constant Worrying

Dufu says one of the greatest pieces of advice she ever received was about her constant worrying. “My mentor said, ‘If you would spend less time worrying about choices you don’t have and actually creating those choices, you would be better off.’ You know that dynamic of worrying about moving to a new city when you haven’t even applied to the job? Take that energy and instead apply it to the job application or interview.”

On the Quarter-Life Crisis

There might be no getting around the dreaded quarter-life crisis, but Dufu says connecting with people who are going through, or have already gone through, the same thing is crucial. “You need someone to tell you you’re not going crazy, people who have already been there, done that — who know it’s going to be OK and can help you achieve clarity through guidance and encouragement.”she says.

On Wanting to Have It All

A woman can have it all in the traditional sense, says Dufu, who herself has a marriage, job, two kids, and a healthy lifestyle. But, she says, she sacrifices other things — like attending events — to do so. The question shouldn’t be, “Can you have it all?” but rather, “Can you have what’s important to you?” she says. “The answer is yes if you can prioritize and not try to live by someone else’s expectations. Because every woman has a list of things she feels like she’s supposed to be doing, and some people manage it by creating more time in the day for themselves or by shortening that list to certain core things.”

<think>好的,用户的问题是关于如何在MyBatis中使用动态SQL查询满足多个条件的学生记录,具体包括专业是计算机、英语或中文,且年龄小于20的学生。我需要根据用户提供的引用内容来构建答案,特别是引用中的动态SQL标签,如`<if>`、`<where>`、`<foreach>`等。 首先,用户提到的条件有专业和年龄两个部分。专业需要匹配多个值,可以用`<foreach>`来处理IN查询。年龄则是单一条件,可以用`<if>`标签。需要注意的是,多个条件之间可能需要使用AND连接,同时要避免SQL语法错误,比如多余的AND或WHERE。这时候`<where>`标签就派上用场了,它可以自动处理这些情况。 接下来,我需要参考用户提供的引用内容。引用[1]提到了动态SQL标签的使用,引用[4]详细说明了`<where>`和`<set>`标签的作用,以及如何避免多余的逗号或AND。特别是`<where>`标签会在至少有一个条件成立时添加WHERE关键字,并自动去除前面的AND或OR,这非常适合处理多个条件的动态拼接。 用户可能需要一个具体的示例,所以我要构造一个XML映射文件的例子,展示如何使用这些标签。例如,在`<select>`标签内使用`<where>`包裹`<if>`和`<foreach>`。对于专业条件,使用`<foreach>`遍历列表,生成IN子句。年龄部分则使用`<if>`检查年龄是否非空,并添加条件。 此外,用户可能关心如何在Java代码中调用这个查询,所以需要提供一个Mapper接口的方法示例,以及如何传递参数,比如使用Map或者DTO对象来包含专业列表和年龄值。 还要注意可能出现的SQL注入问题,确保使用#{}来安全地传递参数,而不是拼接字符串。同时,要提到`<foreach>`标签中各个属性的含义,比如collection、item、open、separator、close,确保用户能正确理解和使用。 最后,按照用户的要求生成相关问题,这些问题应该围绕动态SQL的其他标签、优化方法、参数传递方式等展开,帮助用户进一步学习相关知识。</think>在MyBatis中实现多条件动态查询,可通过`<where>`、`<if>`和`<foreach>`标签组合实现。以下是满足“计算机/英语/中文专业且年龄小于20”学生查询的示例: ```xml <select id="findStudents" resultType="Student"> SELECT * FROM student <where> <!-- 专业条件:多选值动态拼接 --> <if test="majors != null and majors.size() > 0"> major IN <foreach collection="majors" item="item" open="(" separator="," close=")"> #{item} </foreach> </if> <!-- 年龄条件:数值过滤 --> <if test="age != null"> AND age < #{age} </if> </where> </select> ``` #### 实现说明: 1. **`<where>`标签** 自动处理WHERE子句的生成,当内部有条件成立时自动添加WHERE关键字,并去除首个条件前的AND/OR[^4] 2. **`<foreach>`遍历专业列表** - `collection="majors"`:接收Java方法传递的List参数 - `open/close`:生成`(计算机,英语,中文)`的IN条件结构 - 安全参数绑定使用`#{item}`防止SQL注入 3. **`<if>`条件判断** 当`age`参数不为空时才添加年龄过滤条件 #### Java调用示例: ```java // Mapper接口 List<Student> findStudents(@Param("majors") List<String> majors, @Param("age") Integer age); // 调用方法 Map<String, Object> params = new HashMap<>(); params.put("majors", Arrays.asList("计算机", "英语", "中文")); params.put("age", 20); List<Student> result = studentMapper.findStudents(params); ``` #### 注意事项: - 参数传递建议使用`@Param`注解或Map/DTO封装 - 数值比较使用`<`时需注意XML转义问题,也可使用`<`代替 - `<where>`标签会自动过滤掉条件之间的多余AND/OR[^4]
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