使用EF操作Docker中的Mysql实例

database

  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/mysql/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 is14

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。

publicclass MysqlDbContext : DbContext

{

public DbSet<Student> students { get; set; }

protectedoverridevoid OnConfiguring(DbContextOptionsBuilder optionsBuilder)

{

//base.OnConfiguring(optionsBuilder);

string sqlConnection = "server=IP;uid=zaranet;pwd=123456;database=MyDemo";

optionsBuilder.UseMySql(sqlConnection);

}

protectedoverridevoid 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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