更新python后端

2025-09-18 17:18:18 +08:00
parent 2fc209e6e6
commit de6a350da8
45 changed files with 2524 additions and 89 deletions
@@ -2,11 +2,81 @@ from langchain_community.utilities import SQLDatabase
 from langchain_community.agent_toolkits import create_sql_agent
 from langchain_community.chat_models.tongyi import ChatTongyi
 # SQLAlchemy URI
-uri = "mssql+pyodbc://f8_db_test:APN^QPr!K9@122.114.58.23/f8_db_test?driver=ODBC+Driver+18+for+SQL+Server&TrustServerCertificate=yes"
+uri = "mssql+pyodbc://f8_db_test:APN^QPr!K9@122.114.58.23/f8_db_test?driver=ODBC+Driver+18+for+SQL+Server&TrustServerCertificate=yes&Encrypt=no"

 # 建立数据库对象
-ssDB = SQLDatabase.from_uri(
+ssDBLC = SQLDatabase.from_uri(
    uri,
-    include_tables=["NONGHU_INFO"],  # 不加 schema 前缀试试
+    include_tables=["NONGHU_INFO","NONGHU_BLACKLIST",], 
    schema="dbo"                      # 显式指定 schema
-)
+)
+import logging
+import time
+from contextlib import contextmanager
+from sqlalchemy import create_engine, text
+from sqlalchemy.exc import OperationalError as SQLOperationalError
+from urllib.parse import quote_plus
+
+logger = logging.getLogger("MSSQLPool")
+logger.setLevel(logging.INFO)
+
+class MSSQLPool:
+    """
+    SQL Server 连接池封装
+    """
+
+    def __init__(
+        self,
+        user: str,
+        password: str,
+        host: str,
+        database: str,
+        driver: str = "ODBC Driver 18 for SQL Server",
+        encrypt: str = "no",
+        trust_server_certificate: str = "yes",
+        min_size: int = 1,
+        max_size: int = 10,
+        pool_timeout: int = 10,
+    ):
+        self.user = user
+        self.password = quote_plus(password)  # 处理特殊字符
+        self.host = host
+        self.database = database
+        self.driver = driver
+        self.encrypt = encrypt
+        self.trust_server_certificate = trust_server_certificate
+
+        self.engine = create_engine(
+            f"mssql+pyodbc://{self.user}:{self.password}@{self.host}/{self.database}"
+            f"?driver={self.driver}&Encrypt={self.encrypt}&TrustServerCertificate={self.trust_server_certificate}",
+            pool_size=min_size,
+            max_overflow=max_size - min_size,
+            pool_timeout=pool_timeout,
+        )
+
+    @contextmanager
+    def getConn(self, retries: int = 2, delay: float = 1.0):
+        """
+        获取连接，带重试
+        """
+        attempt = 0
+        while attempt <= retries:
+            try:
+                with self.engine.connect() as conn:
+                    yield conn
+                    return
+            except SQLOperationalError as e:
+                logger.warning(f"数据库连接异常: {e}. 尝试重试 ({attempt+1}/{retries})")
+                attempt += 1
+                time.sleep(delay)
+            except Exception as e:
+                logger.error(f"SQL执行异常: {e}")
+                raise
+        raise SQLOperationalError("无法获取数据库连接，多次重试失败")
+    
+mssql_pool = MSSQLPool(
+    user="f8_db_test",
+    password="APN^QPr!K9",
+    host="122.114.58.23",
+    database="f8_db_test",
+)