diff --git a/db_config.py b/db_config.py
new file mode 100644
index 0000000..6c523de
--- /dev/null
+++ b/db_config.py
@@ -0,0 +1,125 @@
+"""
+数据库配置和连接工具
+"""
+
+import psycopg2
+from psycopg2.extras import RealDictCursor
+from sqlalchemy import create_engine
+import pandas as pd
+from loguru import logger
+import os
+from typing import Optional
+
+
+class DatabaseConfig:
+    """数据库配置类"""
+
+    def __init__(self, env: str = "online"):
+        self.host = "host.docker.internal" if env == "online" else "192.168.0.115"
+        self.port = 5432
+        self.database = "etf_db"
+        self.username = "admin"
+        self.password = "admin"
+
+    @property
+    def connection_string(self) -> str:
+        """获取连接字符串"""
+        return f"postgresql://{self.username}:{self.password}@{self.host}:{self.port}/{self.database}"
+
+    @property
+    def psycopg2_params(self) -> dict:
+        """获取psycopg2连接参数"""
+        return {
+            "host": self.host,
+            "port": self.port,
+            "database": self.database,
+            "user": self.username,
+            "password": self.password,
+        }
+
+
+class DatabaseManager:
+    """数据库管理类"""
+
+    def __init__(self, config: DatabaseConfig = None):
+        self.config = config or DatabaseConfig()
+        self.engine = None
+
+    def get_engine(self):
+        """获取SQLAlchemy引擎"""
+        if self.engine is None:
+            self.engine = create_engine(
+                self.config.connection_string,
+                pool_pre_ping=True,
+                pool_recycle=300,
+                echo=False,
+            )
+        return self.engine
+
+    def get_connection(self):
+        """获取psycopg2连接"""
+        return psycopg2.connect(**self.config.psycopg2_params)
+
+    def test_connection(self) -> bool:
+        """测试数据库连接"""
+        try:
+            with self.get_connection() as conn:
+                with conn.cursor() as cursor:
+                    cursor.execute("SELECT 1")
+                    result = cursor.fetchone()
+                    logger.info("数据库连接测试成功")
+                    return True
+        except Exception as e:
+            logger.error(f"数据库连接测试失败: {e}")
+            return False
+
+    def create_table_if_not_exists(self, table_name: str, create_sql: str) -> bool:
+        """创建表（如果不存在）"""
+        try:
+            with self.get_connection() as conn:
+                with conn.cursor() as cursor:
+                    cursor.execute(create_sql)
+                    conn.commit()
+                    logger.info(f"表 {table_name} 创建成功或已存在")
+                    return True
+        except Exception as e:
+            logger.error(f"创建表 {table_name} 失败: {e}")
+            return False
+
+    def insert_dataframe(
+        self, df: pd.DataFrame, table_name: str, if_exists: str = "append"
+    ) -> bool:
+        """将DataFrame插入到数据库表"""
+        try:
+            engine = self.get_engine()
+            df.to_sql(
+                table_name,
+                engine,
+                if_exists=if_exists,
+                index=False,
+                method="multi",
+                chunksize=1000,
+            )
+            logger.info(f"成功插入 {len(df)} 条记录到表 {table_name}")
+            return True
+        except Exception as e:
+            logger.error(f"插入数据到表 {table_name} 失败: {e}")
+            return False
+
+    def execute_query(self, query: str, params: tuple = None) -> Optional[list]:
+        """执行查询并返回结果"""
+        try:
+            with self.get_connection() as conn:
+                with conn.cursor(cursor_factory=RealDictCursor) as cursor:
+                    cursor.execute(query, params)
+                    result = cursor.fetchall()
+                    return result
+        except Exception as e:
+            logger.error(f"执行查询失败: {e}")
+            return None
+
+    def close(self):
+        """关闭连接"""
+        if self.engine:
+            self.engine.dispose()
+            self.engine = None