Hacktoberfest 2026 : les issues que les mainteneurs ont marquées pour octobre, ouvertes et accessibles aux débutants. Parcourir les issues Hacktoberfest

Error when selecting data from table with JSON datatype

Ouverte
  • Quelque chose ne va pas ?
#261 2 commentaires 1 réaction 1 personne assignée Voir sur GitHub

Les mainteneurs répondent en général sous 1 jour

@gargsaumya y travaille déjà.

Depuis le 26/9/2025.

Évaluation

Cette issue n'a pas encore été évaluée.

Description

area: data-types triage done
Describe the bug

When calling cursor.execute to select a json column from a table you receive a runtime error RuntimeError: [Microsoft][ODBC Driver 18 for SQL Server]The connection is no longer usable because the server response for a previously executed statement was incorrectly formatted.

If you are seeing an exception, include the full exceptions details (message and stack trace).

---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
Cell In[13], [line 1](vscode-notebook-cell:?execution_count=13&line=1)
----> [1](vscode-notebook-cell:?execution_count=13&line=1) with connect(getenv("SQL_CONNECTION_STRING")) as conn: # type: ignore
      2     with conn.cursor() as cursor:
      3         cursor.execute("select * from SalesLT.CustomerJson")

File c:\python\notebook\.venv\Lib\site-packages\mssql_python\connection.py:1028, in Connection.__exit__(self, *args)
   1021 """
   1022 Exit the context manager.
   1023 
   1024 Closes the connection when exiting the context, ensuring proper resource cleanup.
   1025 This follows the modern standard used by most database libraries.
   1026 """
   1027 if not self._closed:
-> [1028](file:///C:/python/notebook/.venv/Lib/site-packages/mssql_python/connection.py:1028)     self.close()

File c:\python\notebook\.venv\Lib\site-packages\mssql_python\connection.py:971, in Connection.close(self)
    966 if not self.autocommit:
    967     # If autocommit is disabled, rollback any uncommitted changes
    968     # This is important to ensure no partial transactions remain
    969     # For autocommit True, this is not necessary as each statement is committed immediately
    970     log('info', "Rolling back uncommitted changes before closing connection.")
--> [971](file:///C:/python/notebook/.venv/Lib/site-packages/mssql_python/connection.py:971)     self._conn.rollback()
    972 # TODO: Check potential race conditions in case of multithreaded scenarios
    973 # Close the connection
    974 self._conn.close()

RuntimeError: [Microsoft][ODBC Driver 18 for SQL Server]The connection is no longer usable because the server response for a previously executed statement was incorrectly formatted.
To reproduce

Include a complete code listing (or project/solution) that we can run to reproduce the issue.

Partial code listings, or multiple fragments of code, will slow down our response or cause us to push the issue back to you to provide code to reproduce the issue.

Run the following tsql in a database with the AdventureWorksLT sample data loaded.

select *
from (SELECT * 
  FROM [SalesLT].[Customer]
  for json AUTO) dt

  create table SalesLT.CustomerJson
    (
        CustomerID int primary key,
        CustomerJson JSON
    )

    insert into SalesLT.CustomerJson (CustomerID, CustomerJson)
    select 1, (SELECT * 
      FROM [SalesLT].[Customer]
      for json AUTO)

with connect(getenv("SQL_CONNECTION_STRING")) as conn: # type: ignore
    with conn.cursor() as cursor:
        cursor.execute("select * from SalesLT.CustomerJson")
        if cursor:
            row = cursor.fetchone()
            if row:
                print(row.CustomerJson)
Expected behavior

A string is returned that is in JSON or convertible to JSON.

Further technical details

Python version: 3.12
SQL Server version: SQL database in Fabric
Operating system: uv

Additional context
Can share uv folder directly since it includes connection strings.

Langage dominant
Python
Étoiles
478
Forks
62
Merge moyen
3 j 1 h
PR mergées (30 j)
27

Préparer son environnement

Ouvrir dans Codespaces

Lance le conteneur de développement du projet dans votre navigateur, avec votre propre compte GitHub.

Par où commencer

  1. Lisez l'issue en entier, puis le guide de contribution du projet.
  2. Signalez en commentaire que vous la prenez — cela évite que deux personnes fassent le même travail.
  3. Forkez le dépôt et travaillez sur une branche.
  4. Ouvrez une pull request qui référence le numéro de l'issue.

Autres issues de microsoft/mssql-python

Toutes les issues de microsoft/mssql-python

Issues similaires

Plus d'issues Python

Recevez les nouvelles issues par e-mail

Un résumé court des issues GitHub adaptées aux débutants.