MySQL中,MyISAM中索引文件和数据文件分开存储,均为 非聚焦索引,主索引 额外要求了主键的唯一性;InnoDB的数据按照 存储在 聚焦索引 B+Tree的叶子节点中,其余索引中叶子节点保存的值为 聚焦索引主键的值,所以 其他索引 一般需要查询两次 B+Tree才可获取数据(例外的情况是 覆盖索引,建立多个列的组合索引,而搜索的值就在索引之中。
java_interview_questions 随笔分类 -java_interview_questions java后端开发面试题 面试题 摘要:题目: 以下程序的输出结果是: 选项: A:9 B:18 C:20 D:21 E:22阅读全文 posted @2019-10-07 22:03helloworldmybokeyuan阅读(121)评论(0)推荐(0) 2019春招面试题总结-06...
解决:在SqlMapConfig.xml中配置数据链接池,使用连接池管理数据库链接。 ● Sql语句写在代码中造成代码不易维护,实际应用sql变化的可能较大,sql变动需要改变java代码。解决:将Sql语句配置在XXXXmapper.xml文件中与java代码分离。 ●向sql语句传参数麻烦,因为sql语句的where条件不一定,可能多也可能少,占位符需要和参数一...
假设在配置文件中编写了一条insert语句,那么这条语句需要的值从哪里来呢,在mybatis的mapper配置中有parameterType属性,该属性是专门给sql语句占位符传值的,其实这里也是使用了反射机制,其中sql语句的占位符采用#{},其中大括号当中需要提供java对象的属性名,该属性名和get进行拼接得到get方法名,然后通过反射机制获取该get...
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Java: Are objects of the same type as the interface implemented? Java: Can an interface be instantiated? Find First Nonrepeated Character Java: What’s the difference between equals() and ==? Find trailing zeros in factorial Java Reflection Example Bit Manipulation Interview Questions and Answers...
Popular JavaScript / React / Node / Mongo stack Interview questions and their answers. Many of them, I faced in actual interviews and ultimately got my first full-stack Dev job :) - GitHub - rohan-paul/Awesome-JavaScript-Interviews: Popular JavaScript /
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node-interview-questionsNode是搞后端的,不应该被被归为前端,更不应该用前端的观点去理解,去面试node开发人员。所以这份面试题大全,更侧重后端应用与对Node核心的理解。node开发技能图解node 事件循环机制起源node正风生火起,很多介绍却停留在入门阶段,无法投入生产 node相关的高质量面试题更是少之又少,很难全面考查应...
Tutorial and How to Guide on various topics related to Java Programming Language - Core Java, Spring, Webservices, REST, Hibernate, Maven and Microservices.