call_hg_procedure

Execute stored procedures in Hologres databases to perform complex database operations with specified parameters.

Instructions

Call a stored procedure in Hologres database.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`procedure_name`	Yes	The name of the stored procedure to call in Hologres database
`arguments`	No	The arguments to pass to the stored procedure in Hologres database

Implementation Reference

src/hologres_mcp_server/server.py:594-599 (handler)

Handler logic in the call_tool dispatcher: parses arguments, validates procedure_name, constructs the CALL procedure SQL query.

elif name == "call_hg_procedure":
    procedure_name = arguments.get("procedure_name")
    arguments_list = arguments.get("arguments")
    if not procedure_name:
        raise ValueError("Procedure name are required")
    query = f"CALL {procedure_name}({', '.join(arguments_list)})"

src/hologres_mcp_server/server.py:450-470 (registration)

Tool registration in list_tools(): defines name, description, and input schema for call_hg_procedure.

Tool(
    name="call_hg_procedure",
    description="Call a stored procedure in Hologres database.",
    inputSchema={
        "type": "object",
        "properties": {
            "procedure_name": {
                "type": "string",
                "description": "The name of the stored procedure to call in Hologres database"
            },
            "arguments": {
                "type": "array",
                "items": {
                    "type": "string"
                },
                "description": "The arguments to pass to the stored procedure in Hologres database"
            }
        },
        "required": ["procedure_name"]
    }
),

src/hologres_mcp_server/utils.py:48-79 (helper)

Shared helper function that executes the SQL query constructed by tool handlers, manages DB connection with retry, handles serverless mode, and formats SELECT or other results.

def handle_call_tool(tool_name, query, serverless = False):
    """Handle callTool method."""
    config = get_db_config()
    try:
        with connect_with_retry() as conn:
            with conn.cursor() as cursor:

                # 特殊处理 serverless computing 查询
                if serverless:
                    cursor.execute("set hg_computing_resource='serverless'")
                
                # Execute the query
                cursor.execute(query)
                
                # 特殊处理 ANALYZE 命令
                if tool_name == "gather_hg_table_statistics":
                    return f"Successfully {query}"
                
                # 处理其他有返回结果的查询
                if cursor.description:  # SELECT query
                    columns = [desc[0] for desc in cursor.description]
                    rows = cursor.fetchall()
                    result = [",".join(map(str, row)) for row in rows]
                    return "\n".join([",".join(columns)] + result)
                elif tool_name == "execute_dml_sql":  # Non-SELECT query
                    row_count = cursor.rowcount
                    return f"Query executed successfully. {row_count} rows affected."
                else:
                    return "Query executed successfully"
    except Exception as e:
        return f"Error executing query: {str(e)}"

Hologres MCP Server