mysql数据库的相关内容

问答 2022-10-24 来自：开发者社区

有没有遇到同步MySQL一直卡在某个binlog文件？数据库已经确认后续的binlog都生成了 io

有没有遇到同步MySQL一直卡在某个binlog文件？数据库已经确认后续的binlog都生成了 io.debezium.connector.mysql.MySqlStreamingChangeEventSource [] - Stopped reading binlog after 0 events, no new offset was recorded io.debezium.connect.....

文章 2022-10-23 来自：开发者社区

MySQL5.创建数据库表

目标创建一个school数据库创建学生表(列，字段)使用sql创建学生学号int主键，姓名，密码，性别，生日，地址，电子邮件注意点使用英文()，表的名称尽量使用``括起来auto_increment字符串的使用用’ '括起来所有的语句后面加,（英文），最后一个不加primary key 主键，一般一个表只有一个唯一主键create table student( `id` int(4) not...

文章 2022-10-23 来自：开发者社区

MySQL4.数据库的字段属性(重点)

Unsigned无符号整数声明了该列不能为负数zerofill0填充的不足的位数，使用0来填充，int(3)， 5–005自增通常理解为自增，自动在上一条记录的基础上+1(默认为1)通常用来设计唯一的主键 - index，必须是整数类型非空假设设置为not null，如果不给他赋值，就会报错null，如果不填写值默认就是null默认设置默认的值!sex，默认的值为男，如果不设置该列的值，则会....

文章 2022-10-23 来自：开发者社区

MySQL2.操作数据库语句（了解）

创建数据库create database [if not exists] weastos[ ]符号代表选写 exists意思为存在删除数据库drop database [if exists] weastos使用数据库use `school` ``这个符号如果你的表名或者字段名字是一个特殊字符就要加上查看数据库show database --查看所有数据库

文章 2022-10-22 来自：开发者社区

初识MySQL，关系型和非关系型数据库的区别

数据库分类关系型数据库：Excel（SQL）MySQL,Oracle,Sql Server,DB2,SQLLite通过表和表之间，行和列之间的关系进行数据的存储，学员表，考勤表非关系型数据库：Redis，MongDB（NoSQL）Not Only非关系型数据库，对象存储，通过对象的属性来决定DBMS（数据库管理系统）数据库的管理软件，科学有效的管理我们的数据，维护和获取数据；MySQLMySQL....

文章 2022-10-21 来自：开发者社区

java eclipse 连接mysql数据库并操纵数据库

package chapter19; import java.sql.*; public class Conn { static Connection con;//连接句柄 static Statement sql;//sql语句 static ResultSet res;//结果集 static ResultSet res1; static Statement sql1; pub...

文章 2022-10-20 来自：开发者社区

【Mysql】数据库索引，百万数据测试索引效果

Mysql官方对索引的定义是：索引（index）是帮助Mysql高效获取数据的数据结构。进而，我们可以知道索引的本质是数据结构。一、索引的分类主键索引：也就是我们常见的 PRIMARY KEY，只有一个列作为主键，唯一标识，不可重复。唯一索引：UNIQUE KEY，避免重复的列出现，唯一索引是可以有多个，同一张表里的多个列都可以设置唯一索引。常规索引：KEY/INDEX，默认的类型，通过关键字I....

文章 2022-10-20 来自：开发者社区

【Mysql】数据库事务，脏读、幻读、不可重复读

一、什么是数据库事务数据库事务( transaction)是访问并可能操作各种数据项的一个数据库操作序列，这些操作要么全部执行,要么全部不执行，是一个不可分割的工作单位。事务由事务开始与事务结束之间执行的全部数据库操作组成。——百度百科比如，你有2条sql要执行，如果放到一个事务里，要么2个sql都执行成功，要么都失败。都执行成功了就提交事务，有一个失败了就回滚，不存在一个成功一个失败。二、事务....

文章 2022-10-19 来自：开发者社区

❤️Windows10环境下Docker安装主从MySQL5.7数据库❤️

1 软件环境概览Docker: 20.10.7, build f0df350OS: Windows11WSL: 2Navicat: 11.2.7MySQL: 5.72 Docker分别安装主从MySQL5.7数据库2.1 主数据库安装2.1.1 配置文件2.1.1.1 mysqld.cnf文件创建MySQL启动的配置文件mysqld.cnf其内容为：#mysql master1 config .....

文章 2022-10-19 来自：开发者社区

mybatis -plus插入mysql数据，数据库时间比系统时间差8小时

发现插入的数据有8个小时的时差把数据库连接的url改为url: jdbc:mysql://localhost:3306/mybatis_plus?useSSL=false&useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai即可最后测试正常PS:以前用的是时区用的是UTC

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