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SQL Anywhere 12.0.0 (Français) » SQL Anywhere Server - Programming » ODBC support

 

Data alignment requirements

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 processors such as Sun Sparc, Itanium-IA64, and ARM-based devices.

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 x86, x64, and PowerPC platforms do not require memory alignment. The x64 platform includes Advanced Micro Devices (AMD) AMD64 processors and Intel Extended Memory 64 Technology (EM64T) processors.