Feat (#1951)

* 知识库支持子目录（不包括temp和tmp开头的目录），文件相对路径总长度不可超过255

* init_database.py 增加 --import-db 参数，在版本升级时，如果 info.db
表结构发生变化，但向量库无需重建，可以在重建数据库后，使用本参数从旧的数据库中导入信息

init_database.py

@@ -1,6 +1,7 @@
 import sys
 sys.path.append(".")
-from server.knowledge_base.migrate import create_tables, reset_tables, folder2db, prune_db_docs, prune_folder_files
+from server.knowledge_base.migrate import (create_tables, reset_tables, import_from_db,
+                                           folder2db, prune_db_docs, prune_folder_files)
 from configs.model_config import NLTK_DATA_PATH, EMBEDDING_MODEL
 import nltk
 nltk.data.path = [NLTK_DATA_PATH] + nltk.data.path
@@ -28,6 +29,10 @@
         action="store_true",
         help=("drop the database tables before recreate vector stores")
     )
+    parser.add_argument(
+        "--import-db",
+        help="import tables from specified sqlite database"
+    )
     parser.add_argument(
         "-u",
         "--update-in-db",
@@ -97,6 +102,8 @@
         if args.recreate_vs:
             print("recreating all vector stores")
             folder2db(kb_names=args.kb_name, mode="recreate_vs", embed_model=args.embed_model)
+        elif args.import_db:
+            import_from_db(args.import_db)
         elif args.update_in_db:
             folder2db(kb_names=args.kb_name, mode="update_in_db", embed_model=args.embed_model)
         elif args.increament:

server/db/base.py

@@ -1,5 +1,5 @@
 from sqlalchemy import create_engine
-from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.ext.declarative import declarative_base, DeclarativeMeta
 from sqlalchemy.orm import sessionmaker
 
 from configs import SQLALCHEMY_DATABASE_URI
@@ -13,4 +13,4 @@
 
 SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
 
-Base = declarative_base()
+Base: DeclarativeMeta = declarative_base()

server/db/session.py

@@ -1,10 +1,11 @@
 from functools import wraps
 from contextlib import contextmanager
 from server.db.base import SessionLocal
+from sqlalchemy.orm import Session
 
 
 @contextmanager
-def session_scope():
+def session_scope() -> Session:
     """上下文管理器用于自动获取 Session, 避免错误"""
     session = SessionLocal()
     try:

server/knowledge_base/migrate.py

@@ -5,10 +5,12 @@
                                         list_files_from_folder,files2docs_in_thread,
                                         KnowledgeFile,)
 from server.knowledge_base.kb_service.base import KBServiceFactory
-from server.db.repository.knowledge_file_repository import add_file_to_db
+from server.db.repository.knowledge_file_repository import add_file_to_db # ensure Models are imported
 from server.db.base import Base, engine
+from server.db.session import session_scope
 import os
-from typing import Literal, Any, List
+from dateutil.parser import parse
+from typing import Literal, List
 
 
 def create_tables():
@@ -20,6 +22,45 @@ def reset_tables():
     create_tables()
 
 
+def import_from_db(
+    sqlite_path: str = None,
+    # csv_path: str = None,
+) -> bool:
+    '''
+    在知识库与向量库无变化的情况下，从备份数据库中导入数据到 info.db。
+    适用于版本升级时，info.db 结构变化，但无需重新向量化的情况。
+    请确保两边数据库表名一致，需要导入的字段名一致
+    当前仅支持 sqlite
+    '''
+    import sqlite3 as sql
+    from pprint import pprint
+
+    models = list(Base.registry.mappers)
+
+    try:
+        con = sql.connect(sqlite_path)
+        con.row_factory = sql.Row
+        cur = con.cursor()
+        tables = [x["name"] for x in cur.execute("select name from sqlite_master where type='table'").fetchall()]
+        for model in models:
+            table = model.local_table.fullname
+            if table not in tables:
+                continue
+            print(f"processing table: {table}")
+            with session_scope() as session:
+                for row in cur.execute(f"select * from {table}").fetchall():
+                    data = {k: row[k] for k in row.keys() if k in model.columns}
+                    if "create_time" in data:
+                        data["create_time"] = parse(data["create_time"])
+                    pprint(data)
+                    session.add(model.class_(**data))
+        con.close()
+        return True
+    except Exception as e:
+        print(f"无法读取备份数据库：{sqlite_path}。错误信息：{e}")
+        return False
+
+
 def file_to_kbfile(kb_name: str, files: List[str]) -> List[KnowledgeFile]:
     kb_files = []
     for file in files: