Author: Xu FC
Django: 3.0.2
Python: 3.7.0

创建 Table

---

• 在 APP 中的models.py添加class

from django.db import models

class product_table(models.Model):
    product_name = models.CharField(max_length=20, editable=True)
    product_description = models.TextField(null=True)

• 同步数据库

python3 manage.py makemigrations
python3 manage.py migrate

• 查看 Table

MariaDB [TestManager]> show tables;
+----------------------------+
| Tables_in_TestManager      |
+----------------------------+
| Manage0_product_table      |
| auth_group                 |
| auth_group_permissions     |
| auth_permission            |
| auth_user                  |
| auth_user_groups           |
| auth_user_user_permissions |
| django_admin_log           |
| django_content_type        |
| django_migrations          |
| django_session             |
+----------------------------+
11 rows in set (0.001 sec)

• 查看表结构

MariaDB [TestManager]> desc Manage0_product_table;
+---------------------+-------------+------+-----+---------+----------------+
| Field               | Type        | Null | Key | Default | Extra          |
+---------------------+-------------+------+-----+---------+----------------+
| id                  | int(11)     | NO   | PRI | NULL    | auto_increment |
| product_name        | varchar(20) | NO   |     | NULL    |                |
| product_description | longtext    | YES  |     | NULL    |                |
+---------------------+-------------+------+-----+---------+----------------+
3 rows in set (0.009 sec)

• 通过 django 提供的 API 插入和查询数据

➜  MProject python3 manage.py shell
>>> from Manage0.models import verified
>>> verified.objects.create(bugID='83128', product='ASF', version='1.0.2', tester='lihw', pm='xufc', ad
d_date='2020-01-19')
<verified: 83128>
>>> verified.objects.all()
<QuerySet [<verified: 84405>, <verified: 84732>, <verified: 83128>]>
>>> 

删除 Table

---

• 将要删除的 table 对应的class删掉或者注释掉
• 同步数据库

python3 manage.py makemigrations
python3 manage.py migrate

问题解决

---

问题：不小心先删掉了数据库中的表

• 不小心先删掉了数据库中的表
• 解决办法：
  • 注释掉相应的代码；
  • 伪同步数据库

python3 manage.py makemigrations
python3 manage.py migrate --fake

问题：django.db.utils.ProgrammingError: (1146, "xx doesn't exist")

django.db.utils.ProgrammingError: (1146, "Table 'TestManager.django_content_type' doesn't exist")

• 解决办法：
  • 删除 APP 目录下 migrations 目录下的除 __init__.py的所有文件；
  • 删除数据库中 django_migrations 数据表；
  • 重新同步

python3 manage.py makemigrations
python3 manage.py migrate