flask项目从sqlite3升级的mysql数据库

时间 2019-12-20

标签 flask 项目 sqlite3 sqlite 升级 mysql 数据库栏目 Python 繁體版

原文原文链接

flask项目由于需求变动，须要迁移到mysql数据库。

项目计划采用docker来管理，采用mysql官网的docker来管理。python

sudo rm -rf data/

$ rm -rf log/

修改docker-compose.yml 文件。从原来一个项目中复制过来的docker-compose.yml文件，内容以下：

estimate:
  # restart: always
  build: ./app
  ports:
    - "8000:8000"
  links:
    - mysql:mysql
  volumes:
    - ./app:/usr/src/app
  env_file: .env

mysql:
  # restart: always
  image: mysql:latest
  env_file: .env
  ports:
    - "3306:3306"
  volumes:
    - ./data:/var/lib/mysql
    - ./data/my.cnf:/etc/mysql/my.cnf  
  environment:
    - MYSQL_ROOT_PASSWORD=estimate

配置文件改好了，准备构建镜像：mysql

docker-compose build

看起来一切顺利。linux

ERROR: for mysql  oci runtime error: rootfs_linux.go:53: mounting "/var/lib/docker/aufs/mnt/258ac98827bf738a0196693883820ebb3e4801320a2a3542a39076edf9ef1649/etc/mysql/my.cnf" to rootfs "/var/lib/docker/aufs/mnt/258ac98827bf738a0196693883820ebb3e4801320a2a3542a39076edf9ef1649" caused "not a directory"
Traceback (most recent call last):
  File "/usr/local/bin/docker-compose", line 9, in <module>
    load_entry_point('docker-compose==1.7.1', 'console_scripts', 'docker-compose')()
  File "/usr/local/lib/python2.7/dist-packages/compose/cli/main.py", line 63, in main
    log.error(e.msg)
AttributeError: 'ProjectError' object has no attribute 'msg'

看起来状况不太妙，缘由来配置不能正常拉起来，貌似my.cnf不是一个目录的缘由，改成映射/etc/mysql试了一下，mysql是初始化成功了，可是容器与映射目录中均没有my.cnf文件，暂不知道缘由，先去掉对my.cnf的映射，再次尝试：sql

$ docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                              NAMES
6112bf03d615        estimate_estimate   "/usr/local/bin/super"   29 seconds ago      Up 28 seconds       5000/tcp, 0.0.0.0:8000->8000/tcp   estimate_estimate_1
5bed08089c16        mysql:latest        "docker-entrypoint.sh"   30 seconds ago      Up 29 seconds       0.0.0.0:3306->3306/tcp             estimate_mysql_1

如今看起来正常多了。 4. 修改mysql的默认字符集为utf8,修改配置文件，mysql要注意不后字符集不对，后面很麻烦。docker

$ docker exec -it 5bed08089c16 /bin/bash
root@5bed08089c16:/# cd /etc/                                                                                                                                                                                          
root@5bed08089c16:/etc# ll
bash: ll: command not found
root@5bed08089c16:/etc# cd mysql
root@5bed08089c16:/etc/mysql# ll
bash: ll: command not found
root@5bed08089c16:/etc/mysql# ls
conf.d	my.cnf
root@5bed08089c16:/etc/mysql# vim my.cnf 
bash: vim: command not found
root@5bed08089c16:/etc/mysql# vi my.cnf 
bash: vi: command not found
root@5bed08089c16:/etc/mysql#

郁闷了，容器中没有vim，连vi也没有，还好有apt安装吧。。。。数据库

root@5bed08089c16:/etc/mysql# apt-get install vim
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package vim
root@5bed08089c16:/etc/mysql#

什么状况，貌似，源也不正常。。。flask

apt-get update
apt-get install vim

不是国内源，比较慢，等的时间有点长。。。终于好了。链接mysql查看字符集设置状况。vim

root@5bed08089c16:/etc/mysql# mysql -u root -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.13 MySQL Community Server (GPL)

Copyright (c) 2000, 2016, 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> show variables like '%character%';
+--------------------------+----------------------------+
| Variable_name            | Value                      |
+--------------------------+----------------------------+
| character_set_client     | latin1                     |
| character_set_connection | latin1                     |
| character_set_database   | latin1                     |
| character_set_filesystem | binary                     |
| character_set_results    | latin1                     |
| character_set_server     | latin1                     |
| character_set_system     | utf8                       |
| character_sets_dir       | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.00 sec)

准备修改字符集配置c#

[client]
port            = 3306
socket          = /var/run/mysqld/mysqld.sock
default-character-set=utf8   //added by janl

[mysqld_safe]
pid-file        = /var/run/mysqld/mysqld.pid
socket          = /var/run/mysqld/mysqld.sock
nice            = 0

[mysqld]
skip-host-cache
skip-name-resolve
user            = mysql
pid-file        = /var/run/mysqld/mysqld.pid
socket          = /var/run/mysqld/mysqld.sock
character_set_server=utf8     // added by janl
init_connect='SET NAMES utf8' //added by janl
port            = 3306
basedir         = /usr
datadir         = /var/lib/mysql
tmpdir          = /tmp
lc-messages-dir = /usr/share/mysql
explicit_defaults_for_timestamp

好了，让容器重启一下，让配置生效。再次查看mysql 的字符集配置bash

mysql> show variables like '%character%';
+--------------------------+----------------------------+
| Variable_name            | Value                      |
+--------------------------+----------------------------+
| character_set_client     | utf8                       |
| character_set_connection | utf8                       |
| character_set_database   | utf8                       |
| character_set_filesystem | binary                     |
| character_set_results    | utf8                       |
| character_set_server     | utf8                       |
| character_set_system     | utf8                       |
| character_sets_dir       | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
8 rows in set (0.01 sec)

看来字符集都改过来了，一切顺利，建立数据库。

建立数据库

mysql> CREATE DATABASE IF NOT EXISTS estimate DEFAULT CHARSET utf8 COLLATE utf8_general_ci;  
Query OK, 1 row affected (0.00 sec)

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| estimate           |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
5 rows in set (0.00 sec)

mysql> use estimate;
Database changed
mysql> show tables;
Empty set (0.00 sec)

mysql>

数据库创建起来了，而后就能够和数据库一块儿愉快的玩耍了。。。。。。。。