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sqlallocconnect-mapping.md

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description SQLAllocConnect Mapping
title SQLAllocConnect Mapping | Microsoft Docs
ms.custom
ms.date 01/19/2017
ms.prod sql
ms.prod_service connectivity
ms.reviewer
ms.technology connectivity
ms.topic reference
helpviewer_keywords
SQLAllocConnect function [ODBC], mapping
mapping deprecated functions [ODBC], SQLAllocConnect
ms.assetid ac89dd1f-c565-47cc-8fa3-6fa5f80b5d63
author David-Engel
ms.author v-daenge

SQLAllocConnect Mapping

When an application calls SQLAllocConnect through an ODBC 3.x driver, the call to SQLAllocConnect(henv, phdbc) is mapped to SQLAllocHandle as follows:

  1. The Driver Manager allocates a connection and returns it to the application.

  2. When the application establishes a connection, the Driver Manager calls

    SQLAllocHandle(SQL_HANDLE_DBC, InputHandle, OutputHandlePtr)

    in the driver with InputHandle set to henv, and OutputHandlePtr set to phdbc.