When you use SQLBindCol, SQLBindParameter, or SQLGetData, a C data type is specified for the column or parameter. On certain platforms, the storage (memory) provided for each column must be properly aligned to fetch or store a value of the specified type. The following table lists memory alignment requirements for all processors except x86, x64, and PowerPC platforms. Processors such as Itanium-IA64 and ARM-based devices require memory alignment.
| C Data Type | Alignment required |
|---|---|
| SQL_C_CHAR | none |
| SQL_C_BINARY | none |
| SQL_C_GUID | none |
| SQL_C_BIT | none |
| SQL_C_STINYINT | none |
| SQL_C_UTINYINT | none |
| SQL_C_TINYINT | none |
| SQL_C_NUMERIC | none |
| SQL_C_DEFAULT | none |
| SQL_C_SSHORT | 2 |
| SQL_C_USHORT | 2 |
| SQL_C_SHORT | 2 |
| SQL_C_DATE | 2 |
| SQL_C_TIME | 2 |
| SQL_C_TIMESTAMP | 2 |
| SQL_C_TYPE_DATE | 2 |
| SQL_C_TYPE_TIME | 2 |
| SQL_C_TYPE_TIMESTAMP | 2 |
| SQL_C_WCHAR | 2 (buffer size must be a multiple of 2 on all platforms) |
| SQL_C_SLONG | 4 |
| SQL_C_ULONG | 4 |
| SQL_C_LONG | 4 |
| SQL_C_FLOAT | 4 |
| SQL_C_DOUBLE | 8 |
| SQL_C_SBIGINT | 8 |
| SQL_C_UBIGINT | 8 |
The x64 platform includes Advanced Micro Devices (AMD) AMD64 processors and Intel Extended Memory 64 Technology (EM64T) processors.
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