21python框架之peewee_python peewee

一、安装peewee模块及通过已有表导出，自动生成model

1、通过pip安装peewee

pip install peewee
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2、导出表结构，自动生成model

python -m pwiz -e mysql -H localhost -p 3306 -u root -P  -t tb_address,bt_user vo_erp > models.py
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• -e mysql：连接的是mysql库
• -H ：数据库主机
• -p：数据库端口
• -u：数据库用户名
• -P：密码
• -t：（tb_address,bt_user）表名称，多个时以逗号分隔
• vo_erp：数据库名称
• models.py：生成的文件

二、定义数据库连接和model

1、class Meta:

• database：连接数据库
• table_name：该mudel对应的数据表

2、常用字段类型

• IntegerField
• CharField
• TextField
• DateTimeField
• ForeignKeyField：from_user = ForeignKeyField(关联的Model, backref=“外键名称”，相当于所关联的Model多了此属性)

3、字段属性

• null = False – 非空约束
• index = False – 此字段建立索引
• unique = False – 唯一约束
• column_name = None – Model对应的数据库字段名称
• default = None – 设置默认值
• primary_key = False – 主键约束
• constraints = None - 检查约束e.g. [Check(‘price > 0’)]
• sequence = None – sequence name (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 – 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
• index_type = None – specify a custom index-type, e.g. for Postgres you might specify a ‘BRIN’ or ‘GIN’ index.

db=MySQLDatabase("vo_erp_test",host="localhost",port=3306,user="root",password="123456")
class BaseModel(Model):
    class Meta:
        database=db
class Person(BaseModel):
    id=IntegerField(primary_key=True)
    first_name=CharField()
    last_name=CharField()
    age=IntegerField()
    class Meta:
        table_name="bt_person_info"
        database=db

class Pet(BaseModel):
    id=IntegerField(primary_key=True)
    type=CharField()
    name=CharField()
    # master_id=ForeignKeyField(Person,related_name="pet_master")
    master_id=IntegerField()

    class Meta:
        table_name="bt_pet_info"

class Address(BaseModel):
    id=IntegerField(primary_key=True)
    type
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