peewee基本使用

 

 Content 
Ⅰ  安装
Ⅱ  链接数据库
Ⅲ  建表
Ⅳ  增删改
Ⅴ  基础查询
Ⅵ  ForeignKey
Ⅷ  事务

 参考官方文档：http://docs.peewee-orm.com/en/latest/index.html

1. 安装

pip install peewee

 

2. 链接数据库

以mysql 为例（Peewee提供mysql,postgresql,sqllite）的支持

import peewee
settings = {'host': 'localhost', 'password': '', 'port': 3306, 'user': 'root'}
db = peewee.MySQLDatabase("test",**settings)

 

3. 建表

3.1 表关系

class Person(Model):
    name = CharField(verbose_name='姓名', max_length=10, null=False, index=True)
    passwd = CharField(verbose_name='密码', max_length=20, null=False, default='123456')
    email = CharField(verbose_name='邮件', max_length=50, null=True, unique=True)
    gender = IntegerField(verbose_name='姓别', null=False, default=1)
    birthday = DateField(verbose_name='生日', null=True, default=None)
    is_admin = BooleanField(verbose_name='是否是管理员', default=True)
    class Meta:
        database = db  # 这里是数据库链接，为了方便建立多个表，可以把这个部分提炼出来形成一个新的类
　　　　 table_name = 'persons'  # 这里可以自定义表名

# 例如：
　　　　class BaseModel(Model):
    　　   class Meta:
        　　  database = db
       class Person(BaseModel):
    　　    name = CharField()

 

全部数据类型

Field Type	Sqlite	Postgresql	MySQL
IntegerField	integer	integer	integer
BigIntegerField	integer	bigint	bigint
SmallIntegerField	integer	smallint	smallint
AutoField	integer	serial	integer
FloatField	real	real	real
DoubleField	real	double precision	double precision
DecimalField	decimal	numeric	numeric
CharField	varchar	varchar	varchar
FixedCharField	char	char	char
TextField	text	text	longtext
BlobField	blob	bytea	blob
BitField	integer	bigint	bigint
BigBitField	blob	bytea	blob
UUIDField	text	uuid	varchar(40)
DateTimeField	datetime	timestamp	datetime
DateField	date	date	date
TimeField	time	time	time
TimestampField	integer	integer	integer
IPField	integer	bigint	bigint
BooleanField	integer	boolean	bool
BareField	untyped	not supported	not supported
ForeignKeyField	integer	integer	integer

null = False – 可否为空
index = False – index索引
unique = False – unique索引
column_name = None – string representing the underlying column to use if different, useful for legacy databases
default = None – 默认值，如果callable, 会调用生成！
primary_key = False – 主键
constraints = None - a list of one or more constraints, e.g. [Check('price > 0')]
sequence = None – sequence to populate field (if backend supports it)
collation = None – collation to use for ordering the field / index
unindexed = False – indicate field on virtual table should be unindexed (SQLite-only)
choices = None – an optional iterable containing 2-tuples of value, display
help_text = None – string representing any helpful text for this field
verbose_name = None – string representing the “user-friendly” name of this field

所有属性