feat:客服agent接入nl2sql

This commit is contained in:
2026-09-13 20:48:42 +08:00
parent b133dd58c4
commit dd281b3361
11 changed files with 778 additions and 18 deletions
+124 -1
View File
@@ -2,18 +2,127 @@
from __future__ import annotations
import time
from collections.abc import Awaitable, Callable
from collections.abc import Awaitable, Callable, Iterable
from typing import Any
from nl2sql.embedding import embed_texts
from nl2sql.metadata import build_metadata_chunks
from nl2sql.milvus_collections import NL2SQL_COLLECTION
# ORM 已定义但数据库尚未建表的表,在表说明后追加此标注,
# 让 NL2SQL 生成侧知道该表暂不可查询(权威 Schema 校验也会兜底拒绝)。
MISSING_TABLE_MARKER = "(注意:当前数据库中尚未建表)"
def _escape_filter_value(value: str) -> str:
return value.replace("\\", "\\\\").replace('"', '\\"')
def _row_table_name(row: dict[str, Any]) -> str:
"""兼容 information_schema 大小写键名,取行内表名。"""
value = (
row.get("table_name")
or row.get("TABLE_NAME")
or row.get("Table_name")
or ""
)
return str(value).strip()
def _filter_rows_by_tables(
rows: list[dict[str, Any]], allowed_tables: set[str]
) -> list[dict[str, Any]]:
return [row for row in rows if _row_table_name(row) in allowed_tables]
async def _delete_tables_outside_allowlist(
milvus_client, allowed_tables: set[str]
) -> list[str]:
"""删除集合中不在允许名单内的表元数据 chunk,返回被清理的表名。"""
existing_rows = await milvus_client.query(
collection_name=NL2SQL_COLLECTION,
filter="is_valid == true",
output_fields=["table_name"],
limit=16384,
)
existing_tables = {
str(row.get("table_name") or "").strip()
for row in existing_rows or []
if str(row.get("table_name") or "").strip()
}
removed: list[str] = []
for table_name in sorted(existing_tables - allowed_tables):
await milvus_client.delete(
collection_name=NL2SQL_COLLECTION,
filter=f'table_name == "{_escape_filter_value(table_name)}"',
)
removed.append(table_name)
return removed
def build_orm_metadata_rows(
tables: Iterable[Any],
) -> tuple[list[dict[str, Any]], list[dict[str, Any]]]:
"""把 SQLAlchemy Table 定义合成 information_schema 风格的元数据行。
用于 model/ 已定义、但数据库尚未建表的表:
- 表注释取 ORM ``__table_args__`` 的 comment(ORM 无则空串);
- 字段注释取列 comment(ORM 通常未标注,则为空串);
- 字段类型/可空性从 ORM 列定义推导。
"""
table_rows: list[dict[str, Any]] = []
column_rows: list[dict[str, Any]] = []
for table in tables:
table_rows.append(
{
"TABLE_NAME": str(table.name).strip(),
"TABLE_COMMENT": str(table.comment or "").strip(),
"TABLE_TYPE": "BASE TABLE",
}
)
for position, column in enumerate(table.columns, start=1):
column_rows.append(
{
"TABLE_NAME": str(table.name).strip(),
"COLUMN_NAME": str(column.name).strip(),
"COLUMN_COMMENT": str(column.comment or "").strip(),
"DATA_TYPE": str(column.type).strip().lower(),
"IS_NULLABLE": "YES" if column.nullable else "NO",
"ORDINAL_POSITION": position,
}
)
return table_rows, column_rows
def merge_orm_metadata_rows(
table_rows: list[dict[str, Any]],
column_rows: list[dict[str, Any]],
*,
allowed_tables: set[str],
missing_table_objects: Iterable[Any] = (),
) -> tuple[list[dict[str, Any]], list[dict[str, Any]]]:
"""以 model/ ORM 全量为名单主体合并元数据行。
- 库里真实存在的 ORM 表:沿用 information_schema 行(列注释更全);
- 库里没有的 ORM 表(missing_table_objects):用 ORM 定义合成行,
并在表说明追加 MISSING_TABLE_MARKER 标注"尚未建表";
- 名单之外(DB-only)的行在此丢弃,交由 sync_metadata 从 Milvus 清理。
"""
allowed = {str(name).strip() for name in allowed_tables if str(name).strip()}
merged_tables = [row for row in table_rows if _row_table_name(row) in allowed]
merged_columns = [row for row in column_rows if _row_table_name(row) in allowed]
missing_table_rows, missing_column_rows = build_orm_metadata_rows(
missing_table_objects
)
for row in missing_table_rows:
comment = str(row.get("TABLE_COMMENT") or "").strip()
row["TABLE_COMMENT"] = f"{comment}{MISSING_TABLE_MARKER}".strip()
merged_tables.extend(missing_table_rows)
merged_columns.extend(missing_column_rows)
return merged_tables, merged_columns
async def prepare_metadata_rows(
chunks: list[dict[str, Any]],
*,
@@ -39,7 +148,18 @@ async def sync_metadata(
*,
embedder: Callable[[list[str]], Awaitable[list[list[float]]]] = embed_texts,
timestamp: int | None = None,
allowed_tables: set[str] | None = None,
) -> int:
"""构造并 upsert 元数据 chunk。
allowed_tables 提供时:仅同步名单内的表,并删除集合中名单之外的
表元数据( Milvus 里只保留主数据源认可的表,如 model/ ORM 覆盖的表)。
"""
if allowed_tables is not None:
allowed = {str(name).strip() for name in allowed_tables if str(name).strip()}
table_rows = _filter_rows_by_tables(table_rows, allowed)
column_rows = _filter_rows_by_tables(column_rows, allowed)
chunks = build_metadata_chunks(table_rows, column_rows)
chunks_by_table: dict[str, list[dict[str, Any]]] = {}
for chunk in chunks:
@@ -80,4 +200,7 @@ async def sync_metadata(
if rows:
await milvus_client.upsert(collection_name=NL2SQL_COLLECTION, data=rows)
updated_count += len(rows)
if allowed_tables is not None:
await _delete_tables_outside_allowlist(milvus_client, allowed)
return updated_count