sqlalchemy在python里作为orm还是比较有名气的，以下是建立的几个简单模型，完全可和flask的数据持久层分离。
1 # coding: utf8 2 from sqlalchemy import Column, String, Integer, DateTime, BigInteger, Numeric, ForeignKey, SmallInteger, create_engine 3 from sqlalchemy.ext.declarative import declarative_base 4 from sqlalchemy.orm import create_session, relationship 5 6 Base = declarative_base() 7 _db_session = None 8 9 10 def get_engine(): 11 return create_engine('mysql+pymysql://root:1234@localhost/wms?charset=utf8', echo=True) 12 13 14 def get_session(): 15 if _db_session is None: 16 engine = get_engine() 17 return create_session(engine) 18 else: 19 return _db_session 20 21 22 def create_all(): 23 engine = get_engine() 24 Base.metadata.create_all(engine) 25 26 27 def drop_all(): 28 engine = get_engine() 29 Base.metadata.drop_all(engine) 30 31 32 class Role(Base): 33 __tablename__ = 'a_role' 34 code = Column(String(20), primary_key=True) 35 label = Column(String(50)) 36 37 38 class User(Base): 39 __tablename__ = 'a_user' 40 id = Column(BigInteger, primary_key=True) 41 code = Column(String(20), nullable=False, index=True, unique=True) 42 label = Column(String(50)) 43 pwd = Column(String(50)) 44 create_date = Column(DateTime) 45 memo = Column(String(50)) 46 role_code = Column(String(20), ForeignKey('a_role.code')) 47 role = relationship('Role', backref='users') 48 49 50 class SupplierClass(Base): 51 __tablename__ = 'a_supplier_class' 52 code = Column(String(30), primary_key=True) 53 label = Column(String(50)) 54 55 56 class Supplier(Base): 57 __tablename__ = 'a_supplier' 58 id = Column(BigInteger, primary_key=True) 59 code = Column(String(30), index=True) 60 label = Column(String(50)) 61 tel = Column(String(30)) 62 address = Column(String(50)) 63 contacts = Column(String(30)) 64 level = Column(SmallInteger) 65 create_date = Column(DateTime) 66 memo = Column(String(50)) 67 class_code = Column(String(30), ForeignKey('a_supplier_class.code')) 68 supplier_class = relationship('SupplierClass', backref='suppliers') 69 70 71 class Warehouse(Base): 72 __tablename__ = 'a_warehouse' 73 code = Column(String(30), primary_key=True) 74 label = Column(String(50)) 75 address = Column(String(50)) 76 create_date = Column(DateTime) 77 memo = Column(String(50)) 78 manager_id = Column(BigInteger, ForeignKey('a_user.id')) 79 manager = relationship('User') 80 81 82 class LocationClass(Base): 83 __tablename__ = 'a_location_class' 84 code = Column(String(30), primary_key=True) 85 label = Column(String(50)) 86 87 88 class Location(Base): 89 __tablename__ = 'a_location' 90 id = Column(BigInteger, primary_key=True) 91 code = Column(String(30), index=True) 92 label = Column(String(50)) 93 max_qty = Column(Numeric(10, 2)) 94 create_date = Column(DateTime) 95 memo = Column(String(50)) 96 warehouse_code = Column(String(30), ForeignKey('a_warehouse.code')) 97 manager_id = Column(BigInteger, ForeignKey('a_user.id')) 98 class_code = Column(String(30), ForeignKey('a_location_class.code')) 99 manager = relationship('User') 100 warehouse = relationship('Warehouse') 101 location_class = relationship('LocationClass') 102 103 104 class ItemClass(Base): 105 __tablename__ = 'a_item_class' 106 code = Column(String(30), primary_key=True) 107 label = Column(String(50)) 108 109 110 class Item(Base): 111 __tablename__ = 'a_item' 112 id = Column(BigInteger, primary_key=True) 113 code = Column(String(30), index=True) # 物料代码 114 label = Column(String(100)) # 品名 115 type = Column(SmallInteger) # 0原材料，1半成品，2成品 116 class_code = Column(String(30), ForeignKey('a_item_class.code')) 117 location_id = Column(BigInteger, ForeignKey('a_location.id')) 118 item_class = relationship('ItemClass') # 物料分类 119 location = relationship('Location') # 推荐库位 120 safety_stock = Column(Numeric(10, 2)) # 安全库存 121 mpq = Column(Numeric(10, 2)) # 最小包装数量 122 create_date = Column(DateTime) 123 memo = Column(String(50)) 124 125 126 # drop_all() 127 # create_all()