mysql数据库的相关内容

文章 2022-04-18 来自：开发者社区

MySQL---数据库从入门走向大神系列(二)-用Java对MySQL进行增删改查

上节已经学会对MySQL进行简单的增删改查了，那么，我们如何实现用Java来对数据库操作增删改呢。本节将用Java演示对MySQL进行增删改查。简单的来说，分为4个步骤：1、加载连接器(驱动) 通过Driver类 (最好用类反射来加载，更加灵活)2、建立与数据库的连接3、获取语句对象4、对数据库进行操作(增删改查)其实第一步现在可以不用写了，高版本的MySQL已经在内部帮我们写好了....

文章 2022-04-18 来自：开发者社区

MySQL---数据库从入门走向大神系列(一)-基础入门(3)

显示出stud表中所有age的平均值：select avg(age) as averageAge from stud;显示所有age平均值的四舍五入。select round(avg(age)) as averageAge2 f....

文章 2022-04-18 来自：开发者社区

MySQL---数据库从入门走向大神系列(一)-基础入门(2)

从stud表格删除sex列alter table stud drop sex;也可以用:alter table stud drop column sex;判断NULL值时，不能用‘=’号判断，而是用is....

文章 2022-04-18 来自：开发者社区

MySQL---数据库从入门走向大神系列(一)-基础入门(1)

从最开始的创建数据库，创建表，创建列开始写起，再到常用的EXISTS函数，SELECT 复杂查询，模糊查询LIKE，创建视图等深入学习。为了对单词加深印象，全部在DOS下演示！创建数据库、表create database hncu character set utf8; 创建名为hncu编码为ut....

文章 2022-04-18 来自：开发者社区

MySQL5.7.14-下载安装教程-->MySQL数据库语句详细教程(1)

如何下载：我先去MySQL首页下载最新版本的MySQL-链接：https://www.mysql.com/downloads/进入此界面下载：Downloads–>MySQL Community Edition (GPL)(这是免费版的，当然，有钱的可以用收费的，功能更强大)–>MySQL Community Server (GPL) –>选择对应的系统和电脑版本(在这里，我选....

文章 2022-04-17 来自：开发者社区

【MySQL性能优化】数据库三大范式(二)

欢迎访问原文: 【MySQL性能优化】数据库三大范式(二)数据库设计无非遵循的就是减少冗余量，第二点就是遵循三范式第一范式(1NF)确保每一列的原子性也就是如果每一列都满足是不可再分的最小数据单元，则满足第一范式比如 id name sex address 1 chx 0 湖南长沙在这里，其实地址这个字段是可以再拆分的，拆分成省份，市区。但是，在有的场景下，也可以不分。需要根据具体的需求来看....

文章 2022-04-17 来自：开发者社区

【MySQL】SpringBoot数据库操作乱码问题

今天在Spring-Boot进行数据库插入操作时，遇到了中文乱码插入。首先肯定是检查在哪里出了问题，先是IDEA，没毛病，utf8的然后检查springboot的编码，其实默认就是utf8的，为了保险，我自己把配置写好然后我怀疑在post方式时不是utf8，结果是utf8 软件名为:Postman,模拟访问超级方便，强烈推荐为了更保险，我直接在测试类中写插入可是无一例外，中文全部是乱码。然....

问答 2022-04-16 来自：开发者社区

在 Mysql 中如何连接 test 数据库？

问答 2022-04-16 来自：开发者社区

在 ECS 上安装 MySQL 执行什么命令，查看当前数据库列表？

问答 2022-04-16 来自：开发者社区

在 ECS 上安装 MySQL 执行什么命令，创建 test 数据库？

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