SQL to C: GUID
The identifier for the GUID ODBC SQL data type is:
SQL_GUID
The following table shows the ODBC C data types to which GUID SQL data may be converted. For an explanation of the columns and terms in the table, see Converting Data from SQL to C Data Types.
| C type identifier | Test | *TargetValuePtr | *StrLen_or_IndPtr | SQLSTATE |
|---|---|---|---|---|
| SQL_C_CHAR | BufferLength > Character byte length | Data | 36 | n/a |
| BufferLength < 37 | Undefined | Undefined | 22003 | |
| SQL_C_WCHAR | BufferLength > Character length | Data | 36 | n/a |
| BufferLength < 37 | Undefined | Undefined | 22003 | |
| SQL_C_BINARY | Byte length of data <= BufferLength | Data | Length of data in bytes | n/a |
| Byte length of data > BufferLength | Undefined | Undefined | 22003 | |
| SQL_C_GUID | None[a] | Data | 16[b] | n/a |
[a] The value of BufferLength is ignored for this conversion. The driver assumes that the size of *TargetValuePtr is the size of the C data type.
[b] This is the size of the corresponding C data type.