使用EF操作Docker中的Mysql实例
张子浩 人气:1为啥我会选择mysql呢？因为我的服务器配置较低，而SqlServer在docker中的实例，服务器的运行内存应当保持在2G+,我没有这个条件,它会爆出这样的错误 sqlservr: This program requires a machine with at least 2000 megabytes of memory. 听我朋友说就算你的机器是2G的，也会报这个错误，看了好多网上破解的很是不友好，害怕出更多的问题，所以自然就选择了MySql，（SqlServer吃配置还是很高的）...
当然我们首先也应当在docker中安装mysql容器，我们首先可以通过 docker search mysql 来查询关键字的镜像。NAME:镜像仓库源的名称、DESCRIPTION:镜像的描述、OFFICIAL:是否docker官方发布..如果要看实际的version，则就可以去https://hub.docker.com/ 中找找了.
[root@iZenarrdqnvpc4Z ~]# docker search mysql NAME DESCRIPTION STARS OFFICIAL AUTOMATED mysql MySQL is a widely used, open-source relation… 8995 [OK] mariadb MariaDB is a community-developed fork of MyS… 3175 [OK] mysql/mysql-server Optimized MySQL Server Docker images. Create… 669 [OK] percona Percona Server is a fork of the MySQL relati… 464 [OK] centos/mysql-57-centos7 MySQL 5.7 SQL database server 66 centurylink/mysql Image containing mysql. Optimized to be link… 61 [OK] mysql/mysql-cluster Experimental MySQL Cluster Docker images. Cr… 59 deitch/mysql-backup REPLACED! Please use http://hub.docker.com/r… 41 [OK]
下面直接安装mysql镜像，通过命令 docker pull mysql:latest ，装了个最新版的..哈哈 喜新厌旧嘛...出现了status就ok了...
[root@iZenarrdqnvpc4Z ~]# docker pull mysql:latest latest: Pulling from library/mysql 804555ee0376: Pull complete c53bab458734: Pull complete ca9d72777f90: Pull complete 2d7aad6cb96e: Pull complete ............................... Digest: sha256:e1b0fd480a11e5c37425a2591b6fbd32af886bfc6d6f404bd362be5e50a2e632 Status: Downloaded newer image for mysql:latest docker.io/library/mysql:latest
随后创建Mysql挂在目录，用于存放配置、数据、日志文件，随后启动mysql容器并指定刚刚创建的挂在目录，这两行是分开执行的。
mkdir -p $HOME/mysql/{conf.d,data,logs}
docker run --name mysql -p 3306:3306 -v $HOME/mysqlhttps://img.qb5200.com/download-x/data:/var/lib/mysql -v $HOME/mysql/conf.d:/etc/mysql/conf.d -v $HOME/mysql/logs:/logs --privileged=true -e MYSQL_ROOT_PASSWORD=123456 -d mysql
进入mysql容器。通过root账号登录mysql服务，然后它让你输入密码，这个场景下应该是123456，如果没问题的话就进去了mysql开头的tag中。
[root@iZenarrdqnvpc4Z ~]# docker exec -it mysql /bin/bash
root@7b96a24b92c2:/# mysql -u root -p #{123456}
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 14
Server version: 8.0.18 MySQL Community Server - GPL
Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>
如果想要修改root密码的话，直接把root密码置空随后修改密码。
# 把root密码置空 update user set authentication_string = '' where user = 'root' and host = 'localhost'; # 修改root密码 alter user root@'localhost' identified by '你的密码';
如果你要添加用户给别人用，则可以这么做。
# 添加用户 create user dev@'%' identified by '123456'; # 给用户授权 grant Alter, Create, Create Temporary Tables, Create User, Create View, Delete, Drop, Event, Index, Insert, Lock Tables, Process, References, Reload, Select, Show Databases, Show View, Trigger, Update on *.* to dev@'%'; # 刷新权限 flush privileges;
完事之后你就可以通过navticat premium 工具进行远程连接了...
随后我们创建一个.NET Core工程，添加EF关于MySql的相关包，这里我遇到了一个问题，在我使用 MySql.Data.EntityFrameworkCore 实体移植的时候爆出下面的错误，目前还不知道是什么原因。在.NET Core 3.0+ 有BUG吧。回头我去提交个issues ...
System.TypeLoadException: Method 'get_Info' in type 'MySql.Data.EntityFrameworkCore.Infraestructure.MySQLOptionsExtension' from assembly 'MySql.Data.EntityFrameworkCore, Version=8.0.18.0, Culture=neutral,
所以我使用了 pomelo作为代替它，发现毫无异常。直接code first 开干。
public class MysqlDbContext : DbContext
{
public DbSet<Student> students { get; set; }
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
//base.OnConfiguring(optionsBuilder);
string sqlConnection = "server=IP;uid=zaranet;pwd=123456;database=MyDemo";
optionsBuilder.UseMySql(sqlConnection);
}
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
}
}
随后直接 Add-Migration Init ，再update..
PM> Add-Migration Init To undo this action, use Remove-Migration. PM> update-database Init
OK,打开navicat 看一下 成功了。
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