podbc_get_schemas
Retrieve a list of all schema names from a connected database using SQLAlchemy via pyodbc, enabling efficient database schema management.
Instructions
Retrieve and return a list of all schema names from the connected database.
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| url | No |
Implementation Reference
- mcp_sqlalchemy_server/server.py:53-56 (registration)The @mcp.tool decorator registers the 'podbc_get_schemas' tool with its name and description.
@mcp.tool( name="podbc_get_schemas", description="Retrieve and return a list of all schema names from the connected database." ) - mcp_sqlalchemy_server/server.py:57-79 (handler)The handler function that executes the logic: connects to the ODBC database, queries for tables to get unique catalogs (schemas), and returns them as JSON string.
def podbc_get_schemas(user:Optional[str]=None, password:Optional[str]=None, dsn:Optional[str]=None) -> str: """ Retrieve and return a list of all schema names from the connected database. Args: user (Optional[str]=None): Optional username. password (Optional[str]=None): Optional password. dsn (Optional[str]=None): Optional dsn name. Returns: str: A list of schema names. """ try: with get_connection(True, user, password, dsn) as conn: cursor = conn.cursor() rs = cursor.tables(table=None, catalog="%", schema=None, tableType=None); catalogs = {row[0] for row in rs.fetchall()} return json.dumps(list(catalogs)) except pyodbc.Error as e: logging.error(f"Error retrieving schemas: {e}") raise - Input schema defined by function parameters with type hints and documentation; output is str (JSON list of schemas).
def podbc_get_schemas(user:Optional[str]=None, password:Optional[str]=None, dsn:Optional[str]=None) -> str: """ Retrieve and return a list of all schema names from the connected database. Args: user (Optional[str]=None): Optional username. password (Optional[str]=None): Optional password. dsn (Optional[str]=None): Optional dsn name. Returns: str: A list of schema names. """ - Helper function to establish pyodbc connection using env vars or provided credentials, used by the tool.
def get_connection(readonly=True, uid: Optional[str] = None, pwd: Optional[str] = None, dsn: Optional[str] = None) -> pyodbc.Connection: dsn = DB_DSN if dsn is None else dsn uid = DB_UID if uid is None else uid pwd = DB_PWD if pwd is None else pwd if dsn is None: raise ValueError("ODBC_DSN environment variable is not set.") if uid is None: raise ValueError("ODBC_USER environment variable is not set.") if pwd is None: raise ValueError("ODBC_PASSWORD environment variable is not set.") dsn_string = f"DSN={dsn};UID={uid};PWD={pwd}" logging.info(f"DSN:{dsn} UID:{uid}") # connection_string="DSN=VOS;UID=dba;PWD=dba" return pyodbc.connect(dsn_string, autocommit=True, readonly=readonly)