https://github.com/shaopson/ormlite

一个简单的Python ORM,支持sqlite3 mysql, 具有延迟查询，链式查询等功能; This is a simple ORM, support sqlite3,mysql
https://github.com/shaopson/ormlite

orm python3

Last synced: about 1 month ago
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一个简单的Python ORM,支持sqlite3 mysql, 具有延迟查询，链式查询等功能; This is a simple ORM, support sqlite3,mysql

• Host: GitHub
• URL: https://github.com/shaopson/ormlite
• Owner: shaopson
• Created: 2019-04-18T12:16:09.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2020-03-16T09:28:04.000Z (almost 5 years ago)
• Last Synced: 2023-10-21T11:38:27.197Z (about 1 year ago)
• Topics: orm, python3
• Language: Python
• Homepage:
• Size: 134 KB
• Stars: 3
• Watchers: 0
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# ORMlite

一个简单的Python ORM,支持sqlite3 mysql, 具有延迟查询，链式查询等功能

接口模仿了Django的ORM框架 和Django ORM一样简单，易用，ORMlite不支持迁移功能(migrate)

### 快速上手

如果你使用过Django的ORM，那么你会感觉非常熟悉

创建model,使用sqlite3

```python

import ormlite

from ormlite import configuration

from ormlite.db.utils import create_tables

#设置数据库

configuration.conf_db({

    "ENGINE":"ormlite.db.sqlite3",

    "NAME":"db.sqlite3",

})

#开启Debug 查询时显示生成的sql语句

configuration.debug = True

#定义Model

class User(ormlite.Model):

    id = ormlite.PrimaryKey()

    name = ormlite.CharField(max_length=50)

    sex = ormlite.CharField(max_length=1)

    birthday = ormlite.DateField()

#创建

create_tables([User,],configuration.db)

```

创建对象

```python

import datetime

user = User(name='test',sex='M',birthday=datetime.datetime(2020,1,1).date())

user.save()

```

简单查询

```python

#返回单个User实例

user = User.object.get(id=1)

#获取全部User实例

users = User.object.all()

#查询所有id大于10的实例

# ge:>=,  gt:>, le:<=, lt:<

users = User.object.query(id__gt=10)

#排除所有id大于10的实例

users = User.object.exclude(id__gt=10)

#排序

users = User.object.all().sort('id')#正序

users = User.object.all().sort('-id')#反序

#切片

users = User.object.all()[2:4]

#第一个

user = User.object.all().first()

#最后一个

user = User.object.all().last()

#计数

count = User.object.all().count()

#只查询某个字段(结果以键值对的格式返回)

names = User.object.all().values('name')

#

#只查询某个字段(结果以列表的格式返回)

names = User.object.all().items('name')

#

#列表降维

names = User.object.all().items('name',flat=True)

#

#数据聚合

from ormlite.query import Count,Min,Max,Sum,Avg

result = User.object.all().values(count=Count('id'))

#

#分组计算

result = User.object.all().values(count=Count('name')).group('name')

#[{'name': 'aa', 'count': 1}, {'name': 'bb', 'count': 1}, {'name': 'cc', 'count': 1}]

```

###数据库配置

####sqlite3

```

from ormlite import configuration

configuration.conf_db({

    "ENGINE":"ormlite.db.sqlite3",

    "NAME":"db.sqlite3",

})

```

####mysql

当使用mysql时，需要安装mysql-connector

```

from ormlite import configuration

configuration.conf_db({

    "ENGINE":"ormlite.db.mysql",

    'NAME': 'ormlite',

    'USER': 'root',

    'PASSWORD': 'ormlite',

    'HOST': 'localhost',

    'PORT': '3306',

    'OPTIONS': {

        'autocommit': True,

    }

})

```