experimental[major]: upgrade pydantic (#26228)

libs/experimental/langchain_experimental/sql/base.py

@@ -14,8 +14,7 @@ from langchain_community.utilities.sql_database import SQLDatabase
 from langchain_core.callbacks.manager import CallbackManagerForChainRun
 from langchain_core.language_models import BaseLanguageModel
 from langchain_core.prompts.prompt import PromptTemplate
-
-from langchain_experimental.pydantic_v1 import Field, root_validator
+from pydantic import ConfigDict, Field, model_validator
 
 INTERMEDIATE_STEPS_KEY = "intermediate_steps"
 SQL_QUERY = "SQLQuery:"
@@ -66,12 +65,14 @@ class SQLDatabaseChain(Chain):
     query_checker_prompt: Optional[BasePromptTemplate] = None
     """The prompt template that should be used by the query checker"""
 
-    class Config:
-        arbitrary_types_allowed = True
-        extra = "forbid"
+    model_config = ConfigDict(
+        arbitrary_types_allowed=True,
+        extra="forbid",
+    )
 
-    @root_validator(pre=True)
-    def raise_deprecation(cls, values: Dict) -> Dict:
+    @model_validator(mode="before")
+    @classmethod
+    def raise_deprecation(cls, values: Dict) -> Any:
         if "llm" in values:
             warnings.warn(
                 "Directly instantiating an SQLDatabaseChain with an llm is deprecated. "

libs/experimental/langchain_experimental/sql/vector_sql.py

@@ -14,6 +14,7 @@ from langchain_core.language_models import BaseLanguageModel
 from langchain_core.output_parsers import BaseOutputParser
 from langchain_core.prompts import BasePromptTemplate
 from langchain_core.prompts.prompt import PromptTemplate
+from pydantic import ConfigDict
 
 from langchain_experimental.sql.base import INTERMEDIATE_STEPS_KEY, SQLDatabaseChain
 
@@ -30,8 +31,9 @@ class VectorSQLOutputParser(BaseOutputParser[str]):
     distance_func_name: str = "distance"
     """Distance name for Vector SQL"""
 
-    class Config:
-        arbitrary_types_allowed = 1
+    model_config = ConfigDict(
+        arbitrary_types_allowed=True,
+    )
 
     @property
     def _type(self) -> str: