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