新建小程序后端，新建数据库

mini-program/app/settings.py

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+from functools import lru_cache
+from urllib.parse import quote_plus
+
+from pydantic import Field
+from pydantic_settings import BaseSettings, SettingsConfigDict
+
+
+class Settings(BaseSettings):
+    model_config = SettingsConfigDict(
+        env_file=".env",
+        env_file_encoding="utf-8",
+        extra="ignore",
+    )
+
+    app_name: str = Field(default="mini-program-api", validation_alias="APP_NAME")
+    app_version: str = Field(default="0.1.0", validation_alias="APP_VERSION")
+    app_description: str = Field(
+        default="Backend service for mini program",
+        validation_alias="APP_DESCRIPTION",
+    )
+    host: str = Field(default="0.0.0.0", validation_alias="HOST")
+    port: int = Field(default=8001, validation_alias="PORT")
+
+    db_host: str = Field(default="127.0.0.1", validation_alias="DB_HOST")
+    db_port: int = Field(default=3306, validation_alias="DB_PORT")
+    db_user: str = Field(default="root", validation_alias="DB_USER")
+    db_password: str = Field(default="", validation_alias="DB_PASSWORD")
+    db_name: str = Field(default="mini_program", validation_alias="DB_NAME")
+
+    @property
+    def mysql_dsn(self) -> str:
+        user = quote_plus(self.db_user)
+        password = quote_plus(self.db_password)
+        auth = f"{user}:{password}" if password else user
+        return (
+            f"mysql+pymysql://{auth}@{self.db_host}:{self.db_port}/"
+            f"{self.db_name}?charset=utf8mb4"
+        )
+
+
+@lru_cache(maxsize=1)
+def get_settings() -> Settings:
+    return Settings()
+
+
+settings = get_settings()