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‎docs/.vuepress/navbar.ts‎

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@@ -60,17 +60,6 @@ export default navbar([
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{text: "Kafka面试题", link: "/message-queue/kafka.md"},
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]
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}
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]
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},
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{
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text: "计算机基础",
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icon: "computer",
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children: [
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{text: "网络", link: "/computer-basic/network.md"},
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{text: "操作系统", link: "/computer-basic/operate-system.md"},
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{text: "算法", link: "/computer-basic/algorithm.md"},
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{text: "LeetCode题解", link: "/leetcode/hot120"},
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{text: "数据结构", link: "/computer-basic/data-structure.md"},
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{
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text: "关系型数据库",
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children: [
@@ -88,8 +77,64 @@ export default navbar([
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{text: "ElasticSearch面试题", link: "https://mp.weixin.qq.com/s/Ffb8NDgavf9QAWYBm0qAVg"},
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]
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},
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]
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},
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{
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text: "计算机基础",
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icon: "computer",
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children: [
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{text: "网络", link: "/computer-basic/network.md"},
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{text: "操作系统", link: "/computer-basic/operate-system.md"},
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{text: "算法", link: "/computer-basic/algorithm.md"},
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{text: "LeetCode题解", link: "/leetcode/hot120"},
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{text: "数据结构", link: "/computer-basic/data-structure.md"},
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//{
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// text: "关系型数据库",
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// children: [
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// //{text: "MySQL基础", children: ["/database/mysql-basic/"],},
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// {text: "MySQL基础", link: "/database/mysql-basic/"},
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// {text: "MySQL面试题", link: "/database/mysql.md"},
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// {text: "MySQL执行计划详解", link: "/database/mysql-execution-plan.md"},
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// ]
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//},
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//{
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// text: "非关系型数据库",
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// children: [
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// {text: "Redis基础", link: "/redis/redis-basic/"},
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// {text: "Redis面试题", link: "/redis/redis.md"},
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// {text: "ElasticSearch面试题", link: "https://mp.weixin.qq.com/s/Ffb8NDgavf9QAWYBm0qAVg"},
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// ]
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//},
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]
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},
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]
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},
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//{
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// text: "计算机基础",
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// icon: "computer",
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// children: [
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// {text: "网络", link: "/computer-basic/network.md"},
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// {text: "操作系统", link: "/computer-basic/operate-system.md"},
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// {text: "算法", link: "/computer-basic/algorithm.md"},
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// {text: "LeetCode题解", link: "/leetcode/hot120"},
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// {text: "数据结构", link: "/computer-basic/data-structure.md"},
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// //{
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// // text: "关系型数据库",
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// // children: [
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// // //{text: "MySQL基础", children: ["/database/mysql-basic/"],},
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// // {text: "MySQL基础", link: "/database/mysql-basic/"},
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// // {text: "MySQL面试题", link: "/database/mysql.md"},
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// // {text: "MySQL执行计划详解", link: "/database/mysql-execution-plan.md"},
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// // ]
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// //},
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// //{
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// // text: "非关系型数据库",
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// // children: [
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// // {text: "Redis基础", link: "/redis/redis-basic/"},
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// // {text: "Redis面试题", link: "/redis/redis.md"},
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// // {text: "ElasticSearch面试题", link: "https://mp.weixin.qq.com/s/Ffb8NDgavf9QAWYBm0qAVg"},
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// // ]
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// //},
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// ]
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//},
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{
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text: "进阶之路",
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icon: "win",
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// {text: "微信红包系统如何设计？", link: "/advance/system-design/6-wechat-redpacket-design.md"},
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// {text: "单点登录设计与实现", link: "/advance/system-design/8-sso-design.md"},
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//]
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children: [
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{text: "扫码登录设计", link: "/advance/system-design/README.md"},
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{text: "超时订单自动取消", link: "/advance/system-design/README.md"},
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{text: "短链系统设计", link: "/advance/system-design/README.md"},
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{text: "微信红包系统如何设计？", link: "/advance/system-design/README.md"},
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{text: "单点登录设计与实现", link: "/advance/system-design/README.md"},
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]
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},
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{
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text: "海量数据",
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},
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]
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},
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// {
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// text: "珍藏资源",
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// icon: "collection",
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// children: [
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// {
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// text: "学习资源",
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// children: [
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// {text: "计算机经典电子书PDF", link: "https://github.com/Tyson0314/java-books"},
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// {text: "Leetcode刷题笔记", link: "/learning-resources/leetcode-note.md"},
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// ]
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// },
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// {
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// text: "学习路线",
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// children: [
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// {text: "Java学习路线", link: "/learning-resources/java-learn-guide.md"},
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// {text: "CS学习路线", link: "/learning-resources/cs-learn-guide.md"},
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// ]
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// },
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//
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// ]
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// },
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{
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text: "珍藏资源",
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icon: "collection",
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children: [
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{
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text: "学习资源",
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children: [
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{text: "计算机经典电子书PDF", link: "https://github.com/Tyson0314/java-books"},
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{text: "Leetcode刷题笔记", link: "/learning-resources/leetcode-note.md"},
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]
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},
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{
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text: "学习路线",
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children: [
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{text: "Java学习路线", link: "/learning-resources/java-learn-guide.md"},
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{text: "CS学习路线", link: "/learning-resources/cs-learn-guide.md"},
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]
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},
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]
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},
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{
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text: "关于",
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icon: "about",

‎docs/database/mysql.md‎

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@@ -954,11 +954,16 @@ B+树中**非叶子节点存的是key + 指针**；**叶子节点存的是数据
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当MySQL单表记录数过大时，数据库的性能会明显下降，一些常见的优化措施如下：
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* 合理建立索引。在合适的字段上建立索引，例如在WHERE和ORDER BY命令上涉及的列建立索引，可根据EXPLAIN来查看是否用了索引还是全表扫描
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* 索引优化，SQL优化。最左匹配原则等，参考：https://topjavaer.cn/database/mysql.html#%E4%BB%80%E4%B9%88%E6%98%AF%E8%A6%86%E7%9B%96%E7%B4%A2%E5%BC%95
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* 建立分区。对关键字段建立水平分区，比如时间字段，若查询条件往往通过时间范围来进行查询，能提升不少性能
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* 利用缓存。利用Redis等缓存热点数据，提高查询效率
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* 限定数据的范围。比如：用户在查询历史信息的时候，可以控制在一个月的时间范围内
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* 读写分离。经典的数据库拆分方案，主库负责写，从库负责读
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* 通过分库分表的方式进行优化，主要有垂直拆分和水平拆分
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* 合理建立索引。在合适的字段上建立索引，例如在WHERE和ORDERBY命令上涉及的列建立索引
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7. 数据异构到es
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9. 冷热数据分离。几个月之前不常用的数据放到冷库中，最新的数据比较新的数据放到热库中
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10. 升级数据库类型，换一种能兼容MySQL的数据库（OceanBase、tidb）
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## 说说count(1)、count(*)和count(字段名)的区别
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‎docs/framework/springboot/springboot-dev-tools.md‎

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# SpringBoot 三大开发工具，你都用过么？
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## 一、SpringBoot Dedevtools
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他是一个让SpringBoot支持热部署的工具，下面是引用的方法
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要么在创建项目的时候直接勾选下面的配置：
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![image-20230211115527377](C:\Users\Tyson\AppData\Roaming\Typora\typora-user-images\image-20230211115527377.png)
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要么给springBoot项目添加下面的依赖：
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```xml
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-devtools</artifactId>
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<optional>true</optional>
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</dependency>
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复制代码
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```
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- idea修改完代码后再按下 ctrl + f9 使其重新编译一下，即完成了热部署功能
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- eclipse是按ctrl + s保存 即可自动编译
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如果你想一修改代码就自动重新编译，无需按ctrl+f9。只需要下面的操作：
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### 1.在idea的setting中把下面的勾都打上
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![](http://img.topjavaer.cn/img/image-20230211115603710.png)
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### 2.进入pom.xml,在build的反标签后给个光标，然后按Alt+Shift+ctrl+/
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![](http://img.topjavaer.cn/img/image-20230211115616354.png)
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### 3.然后勾选下面的东西，接着重启idea即可
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![](http://img.topjavaer.cn/img/image-20230211115627263.png)
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## 二、Lombok
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Lombok是简化JavaBean开发的工具，让开发者省去构造器，getter,setter的书写。
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在项目初始化时勾选下面的配置，即可使用Lombok
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![](http://img.topjavaer.cn/img/image-20230211115645530.png)
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或者在项目中导入下面的依赖：
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```xml
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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<optional>true</optional>
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</dependency>
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复制代码
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```
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使用时，idea还需要下载下面的插件：
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![](http://img.topjavaer.cn/img/image-20230211115658171.png)
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下面的使用的例子
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```kotlin
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import com.baomidou.mybatisplus.annotation.TableField;
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import com.baomidou.mybatisplus.annotation.TableName;
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import lombok.AllArgsConstructor;
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import lombok.Data;
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import lombok.NoArgsConstructor;
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@AllArgsConstructor//全参构造器
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@NoArgsConstructor//无参构造器
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@Data//getter + setter
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public class User {
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private Long id;
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private String name;
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private Integer age;
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private String email;
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}
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复制代码
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```
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### 三、Spring Configuration Processor
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该工具是给实体类的属性注入开启提示，自我感觉该工具意义不是特别大！
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因为SpringBoot存在属性注入，比如下面的实体类：
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```typescript
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package org.lzl.HelloWorld.entity;
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import org.springframework.boot.context.properties.ConfigurationProperties;
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import org.springframework.stereotype.Component;
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/**
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* @author Lenovo
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*
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*/
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@Component
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@ConfigurationProperties(prefix = "mypet")
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public class Pet {
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private String nickName;
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private String strain;
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public String getNickName() {
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return nickName;
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}
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public void setNickName(String nickName) {
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this.nickName = nickName;
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}
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public String getStrain() {
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return strain;
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}
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public void setStrain(String strain) {
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this.strain = strain;
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}
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@Override
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public String toString() {
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return "Pet [nickName=" + nickName + ", strain=" + strain + "]";
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}
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}
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复制代码
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```
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想要在`application.properties`和`application.yml`中给mypet注入属性，却没有任何的提示，为了解决这一问题，我们在创建SpringBoot的时候勾选下面的场景：
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![](http://img.topjavaer.cn/img/image-20230211115712481.png)
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或者直接在项目中添加下面的依赖:
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```xml
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-configuration-processor</artifactId>
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<optional>true</optional>
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</dependency>
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复制代码
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```
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并在build的标签中排除对该工具的打包：（减少打成jar包的大小）
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```xml
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<build>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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<configuration>
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<excludes>
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<exclude>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-configuration-processor</artifactId>
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</exclude>
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</excludes>
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</configuration>
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</plugin>
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</plugins>
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</build>
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```
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> 原文：blog.csdn.net/MoastAll/article/details/108237154

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