57 lines
1.8 KiB
Python
57 lines
1.8 KiB
Python
from datetime import datetime
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from sqlalchemy import create_engine, event, text
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from sqlalchemy.dialects.mysql import BIGINT
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from sqlmodel import SQLModel, Field
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from ..config import AppConfig
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from ..config.config import AppCtx
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def get_timestamp():
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return int(datetime.now().timestamp())
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class BaseModel(SQLModel):
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"""数据库基类"""
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id: int = Field(default=None, primary_key=True, sa_type=BIGINT(unsigned=True))
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created_at: int = Field(default_factory=get_timestamp, sa_type=BIGINT(unsigned=True))
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updated_at: int = Field(default_factory=get_timestamp, sa_type=BIGINT(unsigned=True))
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@event.listens_for(BaseModel, "before_update")
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def update_updated_at(mapper, connection, target):
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"""更新数据库记录的时候，自动更新 updated_at 字段"""
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target.updated_at = get_timestamp()
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def connect_db(config: AppConfig):
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"""连接数据库"""
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# 导入所有模型，为了自动创建数据表
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dsn = f"mysql+pymysql://{config.database.user}:{config.database.password}@{config.database.host}:{config.database.port}/{config.database.database}"
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engine = create_engine(dsn, echo=False)
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SQLModel.metadata.create_all(engine)
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AppCtx.g_db_engine = engine
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return engine
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def create_database(config: AppConfig):
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"""如果数据库不存在，就调用这个函数初始化数据库"""
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# 先创建一个没有指定数据库的连接
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dsn = f"mysql+pymysql://{config.database.user}:{config.database.password}@{config.database.host}:{config.database.port}"
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engine = create_engine(dsn, echo=False)
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with engine.connect() as conn:
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conn.execute(
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text(
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f"CREATE DATABASE IF NOT EXISTS {config.database.database} CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci"
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)
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)
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conn.commit()
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