64-bit-integer-structures.md

title	64-Bit Integer Structures | Microsoft Docs
ms.custom
ms.date	01/19/2017
ms.prod	sql
ms.prod_service	connectivity
ms.reviewer
ms.technology	connectivity
ms.topic	conceptual
helpviewer_keywords	C data types [ODBC], 64-bit integer structures data types [ODBC], C data types 64-bit integer structures [ODBC]
ms.assetid	ac80c798-d9b2-4430-85ed-bd2461db0ac7
author	David-Engel
ms.author	v-daenge

64-Bit Integer Structures

The C type for the SQL_C_SBIGINT and SQL_C_UBIGINT data type identifiers on Microsoft C compilers is _int64. When a compiler other than a Microsoft® C compiler is used, the C type might be different. If the compiler supports 64-bit integers natively, the driver or application should define ODBCINT64 to be the native 64-bit integer type. If the compiler does not support 64-bit integers natively, an application or driver can define the following structures to ensure that it has access to this data:

typedef struct{  
SQLUINTEGER dwLowWord;  
SQLUINTEGER dwHighWord;  
} SQLUBIGINT  
  
typedef struct{  
SQLUINTEGER dwLowWord;  
SQLINTEGER sdwHighWord;  
} SQLBIGINT  

These structures should be aligned to an 8-byte boundary because a 64-bit integer is aligned to the 8-byte boundary.